基于Dojo的简单IDE编辑器----DOM浏览器上的实现

感谢reedseutozte的投稿，发现在Web上进行代码编辑的需求越来越多，也有一些开源的实现。 reedseutozte的这篇文章会告诉你如何基于dojo实现自己的代码编辑器。

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两年前，本人写了一篇Blog，描述了如何在IE上实现编辑器的功能，http://blog.csdn.net/reedseutozte/article/details/5761665当时由于产品只要求支持IE浏览器上实现，而且在此过程中。本人一直认为整个文本编辑器的文本应该是一个整体，也就是我操作的核心是文本，而不是编辑器中的DOM结构，所以IE的文本范围非常适合。相反，DOM浏览器（Gecko, Webkit）实现的是Dom范围，按照之前操作文本的思路，几乎不可能在Gecko或者webkit核心的浏览器上实现。

两年后项目要求在DOM浏览器上实现脚本编辑器。一次闲暇的功夫，我又捧起了Nicholas的《JavaScript高级程序》，阅读了关于Dom范围的相关章节（11章第4节）。大师就是大师，对于相关API的描述远胜于W3C网站上枯燥的API描述。基于之前UCD同事代码的思路，我认为要实现脚本编辑器，必须严格屏蔽个排版引擎生成的html差异，让DOM结构完全由自己掌握。我最终定义的DOM结构为每行一个DIV(Opera和Webkit核心浏览器每行就是一个DIV无需作额外的控制, 而Gecko核心浏览器是通过<BR>换行的—---这个使我想到了IE有一个怪癖模式，恩，FF就是一个怪胎，呵呵), 每个单词一个SPAN, 连续的非文本字符除空格外单独一个SPAN,连续的空格或者TAB也在一个SPAN 中，例：

if (sub.SUB_LEVEL == '12' and cust.CUST_SUB.SUB_LEVEL =12 ) 在我的代码中控制其DOM结构为

<div class="linediv">
<span class="keyWord">if</span>
<span> </span>
<span>(</span>
<span>sub.SUB_LEVEL</span>
<span> </span>
<span>==</span>
<span> </span>
<span>'12'</span>
<span> </span>
<span class="keyWord">and</span>
<span> </span>
<span>cust.CUST_SUB.SUB_LEVEL</span>
<span> </span>
<span>=</span>
<span>12</span>
<span> </span>
<span>)</span>
</div>

对于键盘操作需要作特殊处理每次操作之前通过如下代码获得光标所在的DOM节点。由于DOM结构发生变化，每次处理完后，利用range设置光标位置。操作者通过肉眼感知不到这些变化，同时用focusNode属性保存当前光标所在的节点（autocomplete特性需要知道关标所在节点，这样做文本替换的时候就知道文本中的前几个字母已经输入了）获得光标所在节点的代码如下

var range = window.getSelection().getRangeAt(0); // DOM下 
var node = range.startContainer; //node就是光标所在节点

这里有一个细节，就是keypress事件响应的时候，文本还没有发生变化，所以需要利用setTimeout函数调用该处理函数。
键盘处理分为如下三种情形
1）空格及字符
几个大分支
a) 如果是首次编辑，编辑器中没有任何子节点，这个时候需要创建一个DIV，并且要插入一个SPAN到这个DIV中
b) 如果在一个空白行中，则需要创建一个SPAN到该DIV中
c) 提供一个通用处理函数，对于所在节点中的文本按照上文中所描述的分割原则分割
2）回车 -----只需要考虑FF的情况将<BR>替换成div
3）退格及删除
退格，删除的时候要考虑换行删除，单词间空格删除完毕的情况。
数据的收集与设置
脚本数据的收集通过叠代DIV获得每个DIV的textcontent后每行用\n连接而成
设置则是先把\r符号全部现删除（IE中的换行的innerText会返回\r\n）然后用\n分割得到每一行，按照每个单词一个SPAN, 连续的非文本字符除空格外单独一个SPAN,连续的空格或者TAB也在一个SPAN 中的原则分割这一行，放到不同SPAN中设置这个DIV的innerHTML即可
完整代码，同两年前的IE版本一样，基于dojo的autocomplete测试页也和IE的一样，只需要将dijit.form.AutoCompleteEditor替换为dijit.form.ScriptPane_DOM即可

dojo.provide("dijit.form.ScriptPane_DOM");

dojo.require("dijit.form.ComboBox");

dojo.declare(
    "dijit.form.ScriptPane_DOM",
    [dijit._Widget, dijit._TemplatedMixin],
    {
        // summary:
        //        Implements the base functionality for ComboBox/FilteringSelect
        // description:
        //        All widgets that mix in dijit.form.ComboBoxMixin must extend dijit.form._FormValueWidget

        // item: Object
        //        This is the item returned by the dojo.data.store implementation that
        //        provides the data for this cobobox, it's the currently selected item.
        item: null,

        // pageSize: Integer
        //        Argument to data provider.
        //        Specifies number of search results per page (before hitting "next" button)
        pageSize: Infinity,

        // store: Object
        //        Reference to data provider object used by this ComboBox
        store: null,

        // fetchProperties: Object
        //        Mixin to the dojo.data store's fetch.
        //        For example, to set the sort order of the ComboBox menu, pass:
        //        {sort:{attribute:"name",descending:true}}
        fetchProperties:{},

        // query: Object
        //        A query that can be passed to 'store' to initially filter the items,
        //        before doing further filtering based on `searchAttr` and the key.
        //        Any reference to the `searchAttr` is ignored.
        query: {},

        // autoComplete: Boolean
        //        If you type in a partial string, and then tab out of the `<input>` box,
        //        automatically copy the first entry displayed in the drop down list to
        //        the `<input>` field
        autoComplete: false,

        // highlightMatch: String
        //         One of: "first", "all" or "none".
        //        If the ComboBox opens with the serach results and the searched
        //        string can be found it will be highlighted.
        //        This value is not considered when labelType!="text" to not
        //        screw up any mark up the label might contain.
        highlightMatch: "first",
        
        // searchDelay: Integer
        //        Delay in milliseconds between when user types something and we start
        //        searching based on that value
        searchDelay: 100,

        // searchAttr: String
        //        Searches pattern match against this field
        searchAttr: "name",

        // labelAttr: String
        //        Optional.  The text that actually appears in the drop down.
        //        If not specified, the searchAttr text is used instead.
        labelAttr: "",

        // labelType: String
        //        "html" or "text"
        labelType: "text",

        // queryExpr: String
        //        dojo.data query expression pattern.
        //        `${0}` will be substituted for the user text.
        //        `*` is used for wildcards.
        //        `${0}*` means "starts with", `*${0}*` means "contains", `${0}` means "is"
        queryExpr: "${0}*",

        // ignoreCase: Boolean
        //        Set true if the ComboBox should ignore case when matching possible items
        ignoreCase: true,

        // hasDownArrow: Boolean
        //        Set this textbox to have a down arrow button.
        //        Defaults to true.
        hasDownArrow:false,

        templateString: '<div style="height:100px;font-size=small;border:1px solid #7594bc;width:100%" contentEditable="true" autocomplete="off" dojoAttachEvent="onkeypress:_onKeyPress, onfocus:compositionend, onpaste:_onPaste"\ dojoAttachPoint="textbox,focusNode" waiRole="textbox" waiState="haspopup-true,autocomplete-list" type="text"> </div>',

        baseClass:"dijitComboBox",
        
        keyWords:['and', 'or', 'if', 'else', 'return', 'switch', 'case'],
        noliterWords:['(',')', '=', '>', '<', decodeURI('%C2%A0'),':', '{', '}', '$'],
        entityStore: null,
        subStoreMap: {}, 
        leftString: '',

        _getCaretPos: function(/*DomNode*/ element){
            var range = window.getSelection().getRangeAt(0).cloneRange();  
            range.setStart(element, 0);  
            return range.toString().length;
        },

        _setCaretPos: function(/*DomNode*/ element, /*Number*/ location){
//            location = parseInt(location);
//            dijit.selectInputText(element, location, location);            
            var selecttion = window.getSelection();
            selecttion.removeAllRanges();
            var range = document.createRange();
            if (element.nodeType == 1)
            {
                element = element.childNodes[0] || element;               
            }
            if (location > element.textContent.length)
            {
                range.selectNodeContents(element);
                range.collapse(false);
            }
            else
            {
                range.setStart(element, location);
                range.setEnd(element, location);
            }
            selecttion.addRange(range);
            //this.domNode.focus();
        },

        _setDisabledAttr: function(/*Boolean*/ value){
            // summary:
            //        Call this from superclass as part of _setDisabledAttr() method.
            //        Superclass _must_ define _setDisabledAttr().
            // description:
            //        Additional code to set disabled state of combobox node
                //dijit.setWaiState(this.comboNode, "disabled", value);
        },    
        
        _onKeyPress: function(/*Event*/ evt){
            // summary: handles keyboard events
            var key = evt.charOrCode;
            //except for cutting/pasting case - ctrl + x/v
            if(evt.altKey || (evt.ctrlKey && (key != 'x' && key != 'v')) || evt.key == dojo.keys.SHIFT){
                return; // throw out weird key combinations and spurious events
            }
            var doSearch = false, processDom = true;
            var pw = this._popupWidget;
            var dk = dojo.keys;
            if(this._isShowingNow){
                pw.handleKey(evt);
            }
            switch(key){
                case dk.PAGE_DOWN:
                case dk.DOWN_ARROW:
                    if(!this._isShowingNow||this._prev_key_esc){
                        this._arrowPressed();
                        //doSearch=true;                        
                    }else{
                        //this._announceOption(pw.getHighlightedOption());
                        processDom = false;
                        dojo.stopEvent(evt);
                    }                    
                    this._prev_key_backspace = false;
                    this._prev_key_esc = false;
                    break;

                case dk.PAGE_UP:
                case dk.UP_ARROW:
                    if(this._isShowingNow){
                        //this._announceOption(pw.getHighlightedOption());
                        processDom = false;
                        dojo.stopEvent(evt);
                    }                    
                    this._prev_key_backspace = false;
                    this._prev_key_esc = false;
                    break;

                case dk.ENTER:
                    // prevent submitting form if user presses enter. Also
                    // prevent accepting the value if either Next or Previous
                    // are selected
                    var highlighted;
                    if(this._isShowingNow && 
                        (highlighted = pw.getHighlightedOption())
                    ){
                        // only stop event on prev/next
                        if(highlighted == pw.nextButton){
                            this._nextSearch(1);
                            dojo.stopEvent(evt);
                            break;
                        }else if(highlighted == pw.previousButton){
                            this._nextSearch(-1);
                            dojo.stopEvent(evt);
                            break;
                        }
                        else
                        {
                            this._announceOption(pw.getHighlightedOption());
                            this._hideResultList();
                            dojo.stopEvent(evt);
                        }
                        processDom = false;                        
                    }else{
                        // Update 'value' (ex: KY) according to currently displayed text
                        //this._setDisplayedValueAttr(this.attr('displayedValue'), true);
                    }
                    // default case:
                    // prevent submit, but allow event to bubble
                    //evt.preventDefault();
                    // fall through
                    this._hideResultList();
                    break;
                case dk.TAB:
                    var newvalue = this.attr('displayedValue');
                    // #4617: 
                    //        if the user had More Choices selected fall into the
                    //        _onBlur handler
                    if(pw && (
                        newvalue == pw._messages["previousMessage"] ||
                        newvalue == pw._messages["nextMessage"])
                    ){
                        break;
                    }
                    if(this._isShowingNow){
                        this._prev_key_backspace = false;
                        this._prev_key_esc = false;
                        if(pw.getHighlightedOption()){
                            //pw.attr('value', { target: pw.getHighlightedOption() });
                        }
                        this._lastQuery = null; // in case results come back later
                        this._hideResultList();
                        processDom = false;
                    }
                    break;

                case ' ':
                    this._prev_key_backspace = false;
                    this._prev_key_esc = false;
                    if(this._isShowingNow && pw.getHighlightedOption()){
                        dojo.stopEvent(evt);
                        this._announceOption(pw.getHighlightedOption());
                        this._hideResultList();
                        processDom = false;
                    }else{
                        this._hideResultList();
                        doSearch = true;
                    }
                    this.leftString = '';
                    break;

                case dk.ESCAPE:
                    this._prev_key_backspace = false;
                    this._prev_key_esc = true;
                    if(this._isShowingNow){
                        dojo.stopEvent(evt);
                        this._hideResultList();
                        processDom = false;
                    }else{
                        this.inherited(arguments);
                    }
                    break;

                case dk.DELETE:
                case dk.BACKSPACE:
                    this._prev_key_esc = false;
                    this._prev_key_backspace = true;
                    if (dojo.trim(this.focusNode.textContent).length > 1)
                    {
                        doSearch = true;
                    }
                    else
                    {
                        this._hideResultList();
                    }
                    break;

                case dk.RIGHT_ARROW: // fall through
                case dk.LEFT_ARROW: 
                    this._prev_key_backspace = false;
                    this._prev_key_esc = false;
                    break;
                case '.':                    
                    var searchKey = this.focusNode.textContent;                    
                    if (this.subStoreMap[searchKey])
                    {
                        this.set('store', this.subStoreMap[searchKey]);
                        doSearch = true;     
                    } 
                    else
                    {
                        if (searchKey.length > 1)
                        {
                            this.set('store', this.getLazyLoadSubStore(searchKey));
                            doSearch = true;   
                        }                           
                    }
                default: // non char keys (F1-F12 etc..)  shouldn't open list
                    this._prev_key_backspace = false;
                    this._prev_key_esc = false;
                    doSearch = typeof key == 'string';
            }
            if(this.searchTimer){
                clearTimeout(this.searchTimer);
            }
            if(doSearch){
                // need to wait a tad before start search so that the event
                // bubbles through DOM and we have value visible
                setTimeout(dojo.hitch(this, "_startSearchFromInput"),10);
            }
            if (processDom)
            {
                setTimeout(dojo.hitch(this, "_processDomStruct", key),1);
            }
        },
        
        getLazyLoadSubStore: function(key)
        {
            return this.store;
        },

        _autoCompleteText: function(/*String*/ text){
            // summary:
            //         Fill in the textbox with the first item from the drop down
            //         list, and highlight the characters that were
            //         auto-completed. For example, if user typed "CA" and the
            //         drop down list appeared, the textbox would be changed to
            //         "California" and "ifornia" would be highlighted.

            var fn = this.focusNode;
            if (fn.nodeType == 3 && fn.parentNode.tagName == 'DIV')
            {
                fn = dojo.create('SPAN', {}, fn, 'after');
            }
            // IE7: clear selection so next highlight works all the time
            //dijit.selectInputText(fn, fn.textContent.length);
            // does text autoComplete the value in the textbox?
            var caseFilter = this.ignoreCase? 'toLowerCase' : 'substr';
//            if(text[caseFilter](0).indexOf(this.focusNode.textContent[caseFilter](0)) == 0){
//                var cpos = this._getCaretPos(fn);
//                // only try to extend if we added the last character at the end of the input
//                if((cpos+1) > fn.textContent.length){
//                    // only add to input node as we would overwrite Capitalisation of chars
//                    // actually, that is ok
//                    fn.textContent = text;//.substr(cpos);
//                    // visually highlight the autocompleted characters
//                    dijit.selectInputText(fn, cpos);
//                }
//            }
//            else
            {
                // text does not autoComplete; replace the whole value and highlight
                if (dojo.trim(this.leftString))
                {
                    fn.textContent = this.leftString + text;
                }
                else if (this.leftString)
                {
                    this.focusNode = dojo.create('SPAN', {innerHTML: text}, fn, 'after');                    
                }
                else
                {
                    fn.textContent = text;
                }
                this.leftString = '';
                this._setCaretPos(fn, fn.textContent.length);
            }
        },

        _openResultList: function(/*Object*/ results, /*Object*/ dataObject){
            if(    this.disabled || 
                this.readOnly || 
                (dataObject.query[this.searchAttr] != this._lastQuery)
            ){
                return;
            }
            this._popupWidget.clearResultList();
            if(!results.length){
                this._hideResultList();
                return;
            }

            // Fill in the textbox with the first item from the drop down list,
            // and highlight the characters that were auto-completed. For
            // example, if user typed "CA" and the drop down list appeared, the
            // textbox would be changed to "California" and "ifornia" would be
            // highlighted.

            var zerothvalue = new String(this.store.getValue(results[0], this.searchAttr));
            if(zerothvalue && this.autoComplete && !this._prev_key_backspace &&
                (dataObject.query[this.searchAttr] != "*")){
                // when the user clicks the arrow button to show the full list,
                // startSearch looks for "*".
                // it does not make sense to autocomplete
                // if they are just previewing the options available.
                this._autoCompleteText(zerothvalue);
            }
            dataObject._maxOptions = this._maxOptions;
            this._popupWidget.createOptions(
                results, 
                dataObject, 
                dojo.hitch(this, "_getMenuLabelFromItem")
            );

            // show our list (only if we have content, else nothing)
            this._showResultList();

            // #4091:
            //        tell the screen reader that the paging callback finished by
            //        shouting the next choice
            if(dataObject.direction){
                if(1 == dataObject.direction){
                    this._popupWidget.highlightFirstOption();
                }else if(-1 == dataObject.direction){
                    this._popupWidget.highlightLastOption();
                }
                this._announceOption(this._popupWidget.getHighlightedOption());
            }
        },

        _showResultList: function(){
            this._hideResultList();
            var items = this._popupWidget.getItems(),
                visibleCount = Math.min(items.length,this.maxListLength);
            this._arrowPressed();
            // hide the tooltip
//            this.displayMessage("");
            
            // Position the list and if it's too big to fit on the screen then
            // size it to the maximum possible height
            // Our dear friend IE doesnt take max-height so we need to
            // calculate that on our own every time

            // TODO: want to redo this, see 
            //        http://trac.dojotoolkit.org/ticket/3272
            //    and
            //        http://trac.dojotoolkit.org/ticket/4108


            // natural size of the list has changed, so erase old
            // width/height settings, which were hardcoded in a previous
            // call to this function (via dojo.marginBox() call)
            dojo.style(this._popupWidget.domNode, {width: "", height: ""});

            var best = this.open();
            // #3212:
            //        only set auto scroll bars if necessary prevents issues with
            //        scroll bars appearing when they shouldn't when node is made
            //        wider (fractional pixels cause this)
            var popupbox = dojo.marginBox(this._popupWidget.domNode);
            this._popupWidget.domNode.style.overflow = 
                ((best.h==popupbox.h)&&(best.w==popupbox.w)) ? "hidden" : "auto";
            // #4134:
            //        borrow TextArea scrollbar test so content isn't covered by
            //        scrollbar and horizontal scrollbar doesn't appear
            var newwidth = best.w;
            if(best.h < this._popupWidget.domNode.scrollHeight){
                newwidth += 16;
            }
            dojo.marginBox(this._popupWidget.domNode, {
                h: best.h,
                w: Math.max(newwidth, this.domNode.offsetWidth)
            });
            if (this.focusNode)
            {
                var refNode = this.focusNode;
                if (this.focusNode.nodeType == 3)
                {
                    refNode = this.focusNode.parentNode;                    
                }
                var pos = dojo.position(refNode);
                var left = pos.x + this._getCaretPos(this.focusNode) * 8;
                var posout = dojo.position(this.domNode, true);
                if (left > posout.x + posout.w - best.w)
                {
                    left = posout.x + posout.w - best.w;
                }
                dojo.style(this._popupWidget.domNode.parentNode, {position:'absolute', left: left + "px", top: (pos.h + pos.y + 5) + "px"});
                dojo.style(this._popupWidget.domNode, {width: "", height: ""});
            }
//            dijit.setWaiState(this.comboNode, "expanded", "true");
        },

        _hideResultList: function(){
            if(this._isShowingNow){
                dijit.popup.close(this._popupWidget);
                this._arrowIdle();
                this._isShowingNow=false;
//                dijit.setWaiState(this.comboNode, "expanded", "false");
//                dijit.removeWaiState(this.focusNode,"activedescendant");
            }
        },

        _setBlurValue: function(){
            // if the user clicks away from the textbox OR tabs away, set the
            // value to the textbox value
            // #4617: 
            //        if value is now more choices or previous choices, revert
            //        the value
            var newvalue=this.attr('displayedValue');
            var pw = this._popupWidget;
            if(pw && (
                newvalue == pw._messages["previousMessage"] ||
                newvalue == pw._messages["nextMessage"]
                )
            ){
                this._setValueAttr(this._lastValueReported, true);
            }else{
                // Update 'value' (ex: KY) according to currently displayed text
                this.attr('displayedValue', newvalue);
            }
        },

        _onBlur: function(){
            // summary: called magically when focus has shifted away from this widget and it's dropdown
            this._hideResultList();
            this._arrowIdle();
            this.inherited(arguments);
        },

        _announceOption: function(/*Node*/ node){
            // summary:
            //        a11y code that puts the highlighted option in the textbox
            //        This way screen readers will know what is happening in the
            //        menu

            if(node == null){
                return;
            }
            // pull the text value from the item attached to the DOM node
            var newValue;
            if( node == this._popupWidget.nextButton ||
                node == this._popupWidget.previousButton){
                newValue = node.innerHTML;
            }else{
                newValue = this.store.getValue(node.item, this.searchAttr);
            }
            // get the text that the user manually entered (cut off autocompleted text)
            this.focusNode.textContent = this.focusNode.textContent.substring(0, this._getCaretPos(this.focusNode));
            //set up ARIA activedescendant
//            dijit.setWaiState(this.focusNode, "activedescendant", dojo.attr(node, "id")); 
            // autocomplete the rest of the option to announce change
            this._autoCompleteText(newValue);
            this.set('store', this.entityStore); 
        },

        _selectOption: function(/*Event*/ evt){
            var tgt = null;
            if(!evt){
                evt ={ target: this._popupWidget.getHighlightedOption()};
            }
                // what if nothing is highlighted yet?
            if(!evt.target){
                // handle autocompletion where the the user has hit ENTER or TAB
                this.attr('displayedValue', this.attr('displayedValue'));
                return;
            // otherwise the user has accepted the autocompleted value
            }else{
                tgt = evt.target;
            }
            if(!evt.noHide){
                this._hideResultList();
                this._setCaretPos(this.focusNode, this.store.getValue(tgt.item, this.searchAttr).length);
            }
            this._doSelect(tgt);
        },

        _doSelect: function(tgt){
            this.item = tgt.item;
            this.attr('value', this.store.getValue(tgt.item, this.searchAttr));
        },

        _onArrowMouseDown: function(evt){
            // summary: callback when arrow is clicked
            if(this.disabled || this.readOnly){
                return;
            }
            dojo.stopEvent(evt);
            this.focus();
            if(this._isShowingNow){
                this._hideResultList();
            }else{
                // forces full population of results, if they click
                // on the arrow it means they want to see more options
                this._startSearch("");
            }
        },

        _startSearchFromInput: function(){
            this._startSearch(this.focusNode.textContent.replace(/([\\\*\?])/g, "\\$1"));
        },

        _getQueryString: function(/*String*/ text){
            return dojo.string.substitute(this.queryExpr, [text]);
        },

        _startSearch: function(/*String*/ key){
            if (key && dojo.trim(key))
            {
                if (key.indexOf('.') == -1)
                {
                    this.set('store', this.entityStore);
                }                 
                if (dojo.every(key, function(char){
                    return dojo.indexOf(this.noliterWords, char) > -1
                }, this))
                {
                    this.set('store', this.entityStore);
                    this.leftString = '';
                    return;
                }  
                var beginIndex = key.lastIndexOf('.');
                if (beginIndex > -1)
                {
                    this.leftString = key.substr(0, beginIndex + 1);
                    key = key.substr(beginIndex + 1, key.length - 1);                    
                }
            }
            else
            {
                this.leftString = '';
                return;
            }
            
            if(!this._popupWidget){
                var popupId = this.id + "_popup";
                dojo.extend(dijit.form._ComboBoxMenu,
                {
                    // these functions are called in showResultList
                    getItems: function(){
                        return this.domNode.childNodes;
                    },

                    getListLength: function(){
                        return this.domNode.childNodes.length-2;
                    }
                });
                this._popupWidget = new dijit.form._ComboBoxMenu({
                    onChange: dojo.hitch(this, this._selectOption),
                    id:popupId
                });
                this.connect(this._popupWidget, '_onMouseUp', function(event){
                    var value = this.store.getValue(this._popupWidget.getHighlightedOption().item, this.searchAttr);
                    this.focusNode.textContent = value;                    
                    this._hideResultList(); 
                    this._setCaretPos(this.focusNode, value.length);
                });
                //dijit.removeWaiState(this.focusNode,"activedescendant");
                //dijit.setWaiState(this.textbox,"owns",popupId); // associate popup with textbox
            }
            // create a new query to prevent accidentally querying for a hidden
            // value from FilteringSelect's keyField
            this.item = null; // #4872
            var query = dojo.clone(this.query); // #5970
            this._lastInput = key; // Store exactly what was entered by the user.
            this._lastQuery = query[this.searchAttr] = this._getQueryString(key);
            // #5970: set _lastQuery, *then* start the timeout
            // otherwise, if the user types and the last query returns before the timeout,
            // _lastQuery won't be set and their input gets rewritten
            this.searchTimer=setTimeout(dojo.hitch(this, function(query, _this){
                var fetch = {
                    queryOptions: {
                        ignoreCase: this.ignoreCase, 
                        deep: true
                    },
                    query: query,
                    onBegin: dojo.hitch(this, "_setMaxOptions"),
                    onComplete: dojo.hitch(this, "_openResultList"), 
                    onError: function(errText){
                        console.error('dijit.form.ComboBox: ' + errText);
                        dojo.hitch(_this, "_hideResultList")();
                    },
                    start:0,
                    count:this.pageSize
                };
                dojo.mixin(fetch, _this.fetchProperties);
                var dataObject = _this.store.fetch(fetch);

                var nextSearch = function(dataObject, direction){
                    dataObject.start += dataObject.count*direction;
                    // #4091:
                    //        tell callback the direction of the paging so the screen
                    //        reader knows which menu option to shout
                    dataObject.direction = direction;
                    this.store.fetch(dataObject);
                };
                this._nextSearch = this._popupWidget.onPage = dojo.hitch(this, nextSearch, dataObject);
            }, query, this), this.searchDelay);
        },

        _setMaxOptions: function(size, request){
             this._maxOptions = size;
        },

        _getValueField:function(){
            return this.searchAttr;
        },

        /////////////// Event handlers /////////////////////

        _arrowPressed: function(){
            if(!this.disabled && !this.readOnly && this.hasDownArrow){
                dojo.addClass(this.downArrowNode, "dijitArrowButtonActive");
            }
        },

        _arrowIdle: function(){
            if(!this.disabled && !this.readOnly && this.hasDownArrow){
                dojo.removeClass(this.downArrowNode, "dojoArrowButtonPushed");
            }
        },

        // FIXME: 
        //        this is public so we can't remove until 2.0, but the name
        //        SHOULD be "compositionEnd"

        compositionend: function(/*Event*/ evt){
            //    summary:
            //        When inputting characters using an input method, such as
            //        Asian languages, it will generate this event instead of
            //        onKeyDown event Note: this event is only triggered in FF
            //        (not in IE)
            var range = window.getSelection().getRangeAt(0); // DOM下  
            this.focusNode = range.startContainer;
            this._onKeyPress({charCode:-1});
        },

        //////////// INITIALIZATION METHODS ///////////////////////////////////////

        constructor: function(){
            this.query={};
            this.fetchProperties={};
        },

        postMixInProperties: function(){
            this.store = this.entityStore; 
            if(!this.hasDownArrow){
                this.baseClass = "dijitTextBox";
            }
            if(!this.store){
                var srcNodeRef = this.srcNodeRef;

                // if user didn't specify store, then assume there are option tags
                this.store = new dijit.form._ComboBoxDataStore(srcNodeRef);

                // if there is no value set and there is an option list, set
                // the value to the first value to be consistent with native
                // Select

                // Firefox and Safari set value
                // IE6 and Opera set selectedIndex, which is automatically set
                // by the selected attribute of an option tag
                // IE6 does not set value, Opera sets value = selectedIndex
                if(    !this.value || (
                        (typeof srcNodeRef.selectedIndex == "number") && 
                        srcNodeRef.selectedIndex.toString() === this.value)
                ){
                    var item = this.store.fetchSelectedItem();
                    if(item){
                        this.value = this.store.getValue(item, this._getValueField());
                    }
                }
            }
        },
        
        _postCreate:function(){
            //find any associated label element and add to combobox node.
            var label=dojo.query('label[for="'+this.id+'"]');
            if(label.length){
                label[0].id = (this.id+"_label");
                var cn=this.comboNode;
                //dijit.setWaiState(cn, "labelledby", label[0].id);
                
            }
        },

        uninitialize:function(){
            if(this._popupWidget){
                this._hideResultList();
                this._popupWidget.destroy();
            }
        },

        _getMenuLabelFromItem:function(/*Item*/ item){
            var label = this.store.getValue(item, this.labelAttr || this.searchAttr);
            var labelType = this.labelType;
            // If labelType is not "text" we don't want to screw any markup ot whatever.
            if (this.highlightMatch!="none" && this.labelType=="text" && this._lastInput){
                label = this.doHighlight(label, this._escapeHtml(this._lastInput));
                labelType = "html";
            }
            return {html: labelType=="html", label: label};
        },
        
        doHighlight:function(/*String*/label, /*String*/find){
            // summary:
            //        Highlights the string entered by the user in the menu, by default this
            //        highlights the first occurence found. Override this method
            //        to implement your custom highlighing.
            // Add greedy when this.highlightMatch=="all"
            var modifiers = "i"+(this.highlightMatch=="all"?"g":"");
            var escapedLabel = this._escapeHtml(label);
            var ret = escapedLabel.replace(new RegExp("^("+ find +")", modifiers),
                    '<span class="dijitComboBoxHighlightMatch">$1</span>');
            if (escapedLabel==ret){ // Nothing replaced, try to replace at word boundaries.
                ret = escapedLabel.replace(new RegExp(" ("+ find +")", modifiers),
                    ' <span class="dijitComboBoxHighlightMatch">$1</span>');
            }
            return ret;// returns String, (almost) valid HTML (entities encoded)
        },
        
        _escapeHtml:function(/*string*/str){
            // TODO Should become dojo.html.entities(), when exists use instead
            // summary:
            //        Adds escape sequences for special characters in XML: &<>"'
            str = String(str).replace(/&/gm, "&").replace(/</gm, "<")
                .replace(/>/gm, ">").replace(/"/gm, """);
            return str; // string
        },

        open:function(){
            this._isShowingNow=true;
            return dijit.popup.open({
                popup: this._popupWidget,
                around: this.domNode,
                parent: this
            });
        },
        
        reset:function(){
            //    summary:
            //        Additionally reset the .item (to clean up).
            this.item = null;
            this.inherited(arguments);
        },
        
        _onPaste: function(e)
        {
            setTimeout(dojo.hitch(this, '_processPasteText'), 1);            
        },
        
        _processPasteText: function()
        {
            var html = this.domNode.innerHTML;
            if (html.toLowerCase().indexOf('<div>') > 0)
            {
                html = '<div>' + html + '</div>';                
            }
            html = html.split('<br>').join('</div><div>');
            this.domNode.innerHTML = html;                    
            this.setData(this.getData());
        },
        
        _processDomStruct: function(key)
        {        
            if (key)
            {
                var range = window.getSelection().getRangeAt(0); // DOM下  
                var node = range.startContainer;
                console.log('Node type is ' + node.nodeType + ' and key is:' + key);
                if (isNaN(key))
                {
                    //literalInput
                    this._changeDomStructure(0, node);
                }
                else
                {
                    if (key == dojo.keys.ENTER)
                    {
                        this._changeDomStructure(1, node);
                    }
                    else if (key == dojo.keys.DELETE)
                    {
                        this._changeDomStructure(2, node);
                    }
                    else if (key == dojo.keys.BACKSPACE)
                    {
                        this._changeDomStructure(3, node);
                    }
                    else if (key === ' ' || key == dojo.keys.TAB)
                    {
                        this._changeDomStructure(4, node);
                    }
                }
            }             
        },
        
        //type 0 literal 1 ENTER 2 DELETE 3 BACKSPACE 4 SPACE or TAB
        _changeDomStructure: function(type, node)
        {
            var TEXT_NODE = 3, ELEMENT_NODE = 1;
            if (type == 0 || type == 4)
            {                
                if (node.nodeType == TEXT_NODE)
                {
                    //First Input
                    if (node.parentNode == this.domNode)
                    {
                        var text = node.textContent;
                        var trimText = dojo.trim(text);
                        var lineNode = dojo.create('DIV', {className: 'linediv'}, node, 'after');
                        if (trimText)
                        {
                            this.focusNode = dojo.create('SPAN', {innerHTML: trimText}, lineNode);
                        }
                        else
                        {
                            this.focusNode = this.createBlanSpan(text.length);
                            dojo.place(this.focusNode, lineNode);
                        }
                        dojo.destroy(node); 
                        this._setCaretPos(this.focusNode, this.focusNode.textContent.length);
                    }  
                    else if (node.parentNode.tagName == 'DIV')
                    {
                        dojo.addClass(node.parentNode, 'linediv');         
                        this.focusNode = dojo.create('SPAN', {innerHTML: node.textContent}, node, 'after');
                        dojo.destroy(node);
                        this._setCaretPos(this.focusNode, this.focusNode.textContent.length);
                    }
                    else if (node.parentNode.tagName == 'SPAN')
                    {                        
                        var text = node.textContent, spanNode = node.parentNode;
                        var trimText = dojo.trim(text);
                        if (trimText)
                        {
                            var pos = this._getCaretPos(node.parentNode);
                            var tempStrings = this.processLine(node.textContent);
                            var count = 0, findflag = true, refNode = node.parentNode;
                            for (var i = 0; i < tempStrings.length; i++)
                            {
                                count += tempStrings[i].length;
                                if (tempStrings[i])
                                {
                                    if (dojo.trim(tempStrings[i]))
                                    {
                                        var span = dojo.create('SPAN', {innerHTML: tempStrings[i]}, refNode, 'after');
                                    }
                                    else
                                    {
                                        var span = this.createBlanSpan(tempStrings[i].length);
                                        dojo.place(span, refNode, 'after');
                                    }                                    
                                    if (pos <= count && findflag)
                                    {
                                        this.focusNode = span;
                                        this._setCaretPos(span, tempStrings[i].length - (count - pos));
                                        findflag = false;
                                    }
                                    refNode = span;
                                }
                                else
                                {
                                    continue;
                                }
                            }
                            dojo.destroy(node.parentNode);
                            this.highlightText();
                        }
                        else
                        {
                            this.focusNode = node;
                        }
                    }
                    if (dojo.isFF)
                    {
                        var lineNode = (this.focusNode.nodeType == TEXT_NODE)?this.focusNode.parentNode.parentNode:this.focusNode.parentNode;
                        var spanNode = dojo.query('SPAN[type="FixFF"]', lineNode)[0];
                        dojo.destroy(spanNode);
                    }
                }
                else if (node.nodeType == ELEMENT_NODE)
                {
                    //It seemed this branch not triggerd
                }
            }
            else if (type == 1)
            {
                if (dojo.isFF)
                {
                    if (node.nodeType == TEXT_NODE)
                    {
                        //It seemed this branch not triggerd                                            
                    }
                    else if (node.nodeType == ELEMENT_NODE)
                    {
                        if (node.tagName == 'SPAN')
                        {
                            var srcLineNode = node.parentNode;
                            var pos = this._getCaretPos(node);
                            
                            var leftRange = document.createRange();
                            leftRange.selectNodeContents(srcLineNode);
                            var rightRange = leftRange.cloneRange();
                            
                            //set left range 1)clooapse to begin 2)set end 
                            leftRange.collapse(true);
                            leftRange.setEnd(node.childNodes[0], pos);                            
                            //set right range 1)clooapse to end 2)set Start 
                            rightRange.collapse(false);
                            rightRange.setStart(node.childNodes[0], pos);
                            
                            var leftPart = leftRange.extractContents();
                            var rightPart = rightRange.extractContents();
                            
                            dojo.empty(srcLineNode);
                            srcLineNode.appendChild(leftPart);
                            var destNode = dojo.create('DIV', {className: 'linediv'}, srcLineNode, 'after');
                            destNode.appendChild(rightPart);
                            this.focusNode = dojo.query('SPAN', destNode)[0];
                            dojo.forEach(dojo.query('BR', this.focusNode), function(x){
                                dojo.destroy(x);
                            });
                            if (!this.focusNode.textContent)
                            {
                                dojo.create('SPAN', {innerHTML: ' ', type: 'FixFF'}, this.focusNode, 'after');
                            }
                            this._setCaretPos(this.focusNode.parentNode, 0);
                        }
                        else if (node.tagName == 'DIV')
                        {
                            var htmlArr = node.innerHTML.split('<br>');
                            if (node == this.domNode)
                            {                            
                                var divHtmlArr = [];
                                divHtmlArr.push('<DIV class=\'linediv\'>');
                                divHtmlArr.push(htmlArr[0]);
                                divHtmlArr.push('</DIV>');
                                divHtmlArr.push('<DIV class=\'linediv\'>');
                                divHtmlArr.push(htmlArr[1]?htmlArr[1]:'');
                                divHtmlArr.push('</DIV>');
                                node.innerHTML = divHtmlArr.join('');  
                                var divs = dojo.query('DIV', node);
                                this.focusNode = divs[0];
                                this._setCaretPos(this.focusNode, this.focusNode.textContent.length);
                            }
                            else
                            {
                                node.innerHTML = htmlArr[0];
                                this.focusNode = dojo.create('DIV', {className: 'linediv', innerHTML: htmlArr[1]}, node, 'after');
                                this._setCaretPos(this.focusNode, 0);                                
                            }
                        }
                    }
                }
                else
                {
                    this.focusNode = node;                    
                }
            }
            else if (type == 2 || type == 3)
            {
                if (node.nodeType == TEXT_NODE)
                {
                    var elementNode = node.parentNode;
                    if (elementNode.tagName == 'SPAN')
                    {
                        this._processLineafterDeletion(elementNode.parentNode, node)
                    }
                    else if (elementNode.tagName == 'DIV' && elementNode != this.domNode)
                    {
                        this._processLineafterDeletion(elementNode, node)
                    }
                }
                else if (node.nodeType == ELEMENT_NODE)
                {
                    if (node.tagName == 'SPAN')
                    {
                        this._processLineafterDeletion(node.parentNode, node)
                    }
                    else if (node.tagName == 'DIV' && node != this.domNode)
                    {
                        this._processLineafterDeletion(node, node)
                    }
                }
            }            
            this.highlightText();            
        },
        
        highlightText: function()
        {
            dojo.forEach(dojo.query('DIV.linediv', this.domNode), function(line){
                var lineSpans = dojo.query('SPAN', line);
                var tempvalbegin = -1;
                for (var i = 0; i < lineSpans.length; i++)
                {
                    dojo.removeClass(lineSpans[i], 'keyWord');
                    dojo.removeClass(lineSpans[i], 'tempVal');
                    if (tempvalbegin == -1 && lineSpans[i].textContent.indexOf('${') == 0)
                    {
                        tempvalbegin = i;                                                
                    }
                    if (tempvalbegin == -1 && dojo.indexOf(this.keyWords, lineSpans[i].textContent) != -1)
                    {
                        dojo.addClass(lineSpans[i], 'keyWord');                        
                    }
                    if (tempvalbegin > -1 && lineSpans[i].textContent.indexOf('}') == 0)
                    {
                        for (var j = tempvalbegin; j <= i; j++)
                        {
                            dojo.addClass(lineSpans[j], 'tempVal');                                      
                        }
                        tempvalbegin = -1;
                    }
                }
            }, this);
        },
        
        _processLineafterDeletion: function(lineNode, focusNode)
        {
            if (!dojo.trim(focusNode.textContent))
            {
                this.leftString = '';
            }
            var TEXT_NODE = 3, ELEMENT_NODE = 1;
            var spanNodes = dojo.query('SPAN', lineNode);
            if (spanNodes.length == 1)
            {
                if (spanNodes[0].textContent)
                {
                    this.focusNode = focusNode;
                    this._setCaretPos(this.focusNode, this._getCaretPos(focusNode));                    
                }
                else
                {
                    if (dojo.isFF)
                    {
                        dojo.attr(spanNodes[0], {type: 'FixFF'});
                        spanNodes[0].innerHTML = ' ';
                        this.focusNode = spanNodes[0];
                        this._setCaretPos(this.focusNode, 0);                              
                    }
                    else
                    {
                        dojo.destroy(spanNodes[0]);
                        this.focusNode = lineNode;
                        this._setCaretPos(this.focusNode, this.focusNode.textContent.length);  
                    }
                }
            }
            else
            {
                var emptySpans = dojo.filter(spanNodes, function(x){
                    return !x.textContent;
                });
                if (emptySpans.length >= 1)
                {
                    this.focusNode = emptySpans[0];                    
                    var leftText = this.focusNode.previousSibling?this.focusNode.previousSibling.textContent:'';
                    var rightText = this.focusNode.nextSibling?this.focusNode.nextSibling.textContent:'';
                    if (leftText)
                    {
                        dojo.destroy(this.focusNode.previousSibling);
                    }
                    if (rightText)
                    {
                        dojo.destroy(this.focusNode.nextSibling);
                    }
                    if (dojo.trim(leftText) && (dojo.trim(rightText) && dojo.indexOf(this.noliterWords, rightText) == -1))
                    {
                        this.focusNode.textContent = leftText + rightText;
                    }
                    else
                    {
                        this.focusNode.textContent = leftText;
                        dojo.place(this.createBlanSpan(rightText.length), this.focusNode, 'after');
                    }
                    this._setCaretPos(this.focusNode, leftText.length);
                }
                else
                {
                    this.focusNode = focusNode;
                    this._setCaretPos(this.focusNode, this._getCaretPos(focusNode));
                }
            }            
        },
        
        createBlanSpan: function(length)
        {
            return dojo.create('SPAN', {innerHTML: dojo.string.pad('', length * 6, ' ')}); 
        },
        
        getData: function()
        {            
            var codes = [];
            dojo.forEach(dojo.query('DIV', this.domNode), function(line) {
                var tempcode = line.textContent;
                codes.push(tempcode);
            });
            codes = codes.join("\r\n");
            return codes;
        },
        
        setData: function(data)
        {            
            var linkArray = data.split('\r\n').join('\n').split('\r').join('\n').split('\n');
            dojo.empty(this.domNode);
            var htmlArr = [];
            for (var i = 0; i < linkArray.length; i++) 
            {
                htmlArr.push('<DIV class=\'linediv\'>');
                dojo.forEach(this.processLine(linkArray[i]), function(word){
                    htmlArr.push('<SPAN>');
                    htmlArr.push(word);
                    htmlArr.push('</SPAN>');
                }); 
                htmlArr.push('</DIV>');
            }
            this.domNode.innerHTML = htmlArr.join('');
            this.highlightText();   
        },
        
        processLine: function(text)
        {
            if (!text)
            {
                return [''];
            }
            var subBegin = 0, result = [], beginFlag = 0//literal
            if (!dojo.trim(text[0]))
            {
                beginFlag = 1;//space
            }
            else if (dojo.indexOf(this.noliterWords, text[0]) > -1)
            {
                beginFlag = 2; //none literal
            }
            for (var i = 1; i < text.length; i++)
            {
                if (beginFlag == 0 && (dojo.indexOf(this.noliterWords, text[i]) == -1 && dojo.trim(text[i])))
                {
                    continue;                    
                }
                else if (beginFlag == 1 && !dojo.trim(text[i]))
                {
                    continue;                    
                }
                else if (beginFlag == 2 && dojo.indexOf(this.noliterWords, text[i]) > -1)
                {
                    continue;                    
                }
                else
                {
                    result.push(text.substring(subBegin, i));
                    subBegin = i;
                    if (!dojo.trim(text[i]))
                    {
                        beginFlag = 1;//space
                    }
                    else if (dojo.indexOf(this.noliterWords, text[i]) > -1)
                    {
                        beginFlag = 2; //none literal
                    }
                    else
                    {
                        beginFlag = 0; //literal                        
                    }
                }
            }
            if (subBegin < text.length)
            {
                result.push(text.substring(subBegin, text.length));                
            }
            return result;
        }
    }
);

posted on 2012-05-23 14:09 springside5 阅读(266) 评论(0) 编辑收藏举报