javascript 模板系统 ejs v7

javascript模板系统 ejs 第七版！

本版本只要是对其易用性进一些修改，去掉两个冗余的功能。

我发现我的模块系统天生就能实现模块套嵌，因此有关子模板导入的两个操作符去掉。

对参数进行多态化，可简单地传入一个字符串来指定目标元素的选择器或目标文件的URL（通过url(http://)来区分）与一个参数对象，也可以像EXT那样传入一个哈希。

//dom.ejs v7 by 司徒正美
//http://www.cnblogs.com/rubylouvre/archive/2010/10/04/1841933.html
;
(function(){
  this.dom = {
    quote : String.quote || function (str) {
      str = str.replace(/[\x00-\x1f\\]/g, function (chr) {
        var special = metaObject[chr];
        return special ? special : '\\u' + ('0000'+chr.charCodeAt(0).toString(16)).slice(-4);
      });
      return '"' + str.replace(/"/g, '\\"') + '"';
    },
    mix : function(target, source ,override) {
      var i, ride = (override === void 0) || override;
      for (i in source) {
        if (ride || !(i in target)) {
          target[i] = source[i];
        }
      }
      return target;
    }
  }
 
  if(!String.prototype.trim){
    String.prototype.trim = function(){
      return this.replace(/^[\s\xa0]+|[\s\xa0]+$/g, '');
    }
  }
  ;
  (function(w,s){
    //http://blogs.msdn.com/xmlteam/archive/2006/10/23/using-the-right-version-of-msxml-in-internet-explorer.aspx
    s = ["XMLHttpRequest",
      "ActiveXObject('Msxml2.XMLHTTP.6.0')",
      "ActiveXObject('Msxml2.XMLHTTP.3.0')",
      "ActiveXObject('Msxml2.XMLHTTP')",
      "ActiveXObject('Microsoft.XMLHTTP')"];
    //IE专有的JScript方法：ScriptEngine，ScriptEngineBuildVersion，ScriptEngineMajorVersion，ScriptEngineMinorVersion，CollectGarbage，RuntimeObject和GetObject。
    if( !-[1,] && w.ScriptEngineMinorVersion() === 7 && location.protocol === "file:"){
      s.shift();
    }
    for(var i = 0 ,el;el=s[i++];){
      try{
        if(eval("new "+el)){
          dom.xhr = new Function( "return new "+el);
          break;
        }
      }catch(e){}
    }
  })(window);
 
  var
  metaObject = {
    '\b': '\\b',
    '\t': '\\t',
    '\n': '\\n',
    '\f': '\\f',
    '\r': '\\r',
    '\\': '\\\\'
  },
  _startOfHTML = "\t__views.push(",
  _endOfHTML = ");\n",
  _rAt = /(^|[^\w\u00c0-\uFFFF_])(@)(?=\w)/g,
  _partial = function(url){
    var xhr = dom.xhr();
    xhr.open("GET",url,false);
    xhr.setRequestHeader("If-Modified-Since","0");
    xhr.send(null);
    return xhr.responseText|| ""
  },
  defaults = {
    left: "<&",
    right: "&>"
  }
  var ejs = dom.ejs = function(obj,data){
    if(typeof obj === "string"){
      if(obj.indexOf("url(") === 0){
        obj = {
          url : obj.slice(4,-1),
          data: data
        }
      }else{
        obj = {
          selector:obj,
          data :data
        }
      }
    }
    dom.mix(obj, defaults,false);
    if(!obj.rLeft){
      obj.rLeft = new RegExp("\\s*"+obj.left+"\\s*")
      obj.rRight = new RegExp("\\s*"+ obj.right+"\\s*");
    }
    var key = obj.selector || obj.url;
 
    if(!ejs[key]){
      var  rAt = _rAt, startOfHTML = _startOfHTML, endOfHTML = _endOfHTML,partial = _partial,
      buff = ["var __views = [];\n"],str , logic;
      if(obj.selector){
        var el = document.getElementById(key);
        if (!el) throw "can not find the target element";
        str = el.text;
      }else {
        str = partial(obj.url);
        if (!str) throw "the target file does not exist";
      }
      var arr = str.trim().split(obj.rLeft),temp = [],i = 0,n = arr.length,els,segment;
      while(i < n){
        segment = arr[i++];
        els = segment.split(obj.rRight);
        if(segment.indexOf(obj.right) !== -1){//这里不使用el.length === 2是为了避开IE的split bug
          switch (els[0].charAt(0)) {
            case "="://处理后台返回的变量（输出到页面的);
              logic = els[0].substring(1);
              if(logic.indexOf("@")!==-1){
                temp.push(startOfHTML, logic.replace(rAt,"$1data."), endOfHTML);
              }else{
                temp.push(startOfHTML, logic, endOfHTML);
              }
              break;
            case "#"://处理注释
              break;
            default://处理逻辑
              logic = els[0];
              if(logic.indexOf("@")!==-1){
                temp.push(logic.replace(rAt,"$1data."), "\n");
              }else{
                temp.push(logic, "\n");
              }
          }
          //处理静态HTML片断
          els[1] &&  temp.push(startOfHTML, dom.quote.call(null,els[1]), endOfHTML)
        }else{
          //处理静态HTML片断
          temp.push(startOfHTML, dom.quote.call(null,els[0]), endOfHTML)
        }
      }
      ejs[key] = new Function("data",buff.concat(temp).join("")+';return __views.join("");');
    }
    return  ejs[key](obj.data || {});
  }
})();

使用方法见如下例子：

<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta content="IE=8" http-equiv="X-UA-Compatible"/>
    <title>javascript 模板系统 ejs v6 by 司徒正美</title>
    <style type="text/css">
      table {
        border:1px solid #a9ea00;
        border-collapse:collapse;
        width:80%;
      }
      td{
        border:1px solid #a9ea00;
        padding:0;
        text-align:center;
      }
    </style>
    <script>
      //dom.ejs v7 by 司徒正美
      //http://www.cnblogs.com/rubylouvre/archive/2010/10/04/1841933.html
      ;
      (function(){
        this.dom = {
          quote : String.quote || function (str) {
            str = str.replace(/[\x00-\x1f\\]/g, function (chr) {
              var special = metaObject[chr];
              return special ? special : '\\u' + ('0000'+chr.charCodeAt(0).toString(16)).slice(-4);
            });
            return '"' + str.replace(/"/g, '\\"') + '"';
          },
          mix : function(target, source ,override) {
            var i, ride = (override === void 0) || override;
            for (i in source) {
              if (ride || !(i in target)) {
                target[i] = source[i];
              }
            }
            return target;
          }
        }

if(!String.prototype.trim){
          String.prototype.trim = function(){
            return this.replace(/^[\s\xa0]+|[\s\xa0]+$/g, '');
          }
        }
        ;
        (function(w,s){
          //http://blogs.msdn.com/xmlteam/archive/2006/10/23/using-the-right-version-of-msxml-in-internet-explorer.aspx
          s = ["XMLHttpRequest",
            "ActiveXObject('Msxml2.XMLHTTP.6.0')",
            "ActiveXObject('Msxml2.XMLHTTP.3.0')",
            "ActiveXObject('Msxml2.XMLHTTP')",
            "ActiveXObject('Microsoft.XMLHTTP')"];
          //IE专有的JScript方法：ScriptEngine，ScriptEngineBuildVersion，ScriptEngineMajorVersion，ScriptEngineMinorVersion，CollectGarbage，RuntimeObject和GetObject。
          if( !-[1,] && w.ScriptEngineMinorVersion() === 7 && location.protocol === "file:"){
            s.shift();
          }
          for(var i = 0 ,el;el=s[i++];){
            try{
              if(eval("new "+el)){
                dom.xhr = new Function( "return new "+el);
                break;
              }
            }catch(e){}
          }
        })(window);

</script>
    <script>
      window.onload = function(){
        var trs = [
          {name:"隐形杀手",age:29,sex:"男"},
          {name:"索拉",age:22,sex:"男"},
          {name:"fesyo",age:23,sex:"女"},
          {name:"恋妖壶",age:18,sex:"男"},
          {name:"竜崎",age:25,sex:"男"},
          {name:"你不懂的",age:30,sex:"女"}
        ]
        var lis = {
          aaa:"AAA",
          bbb:"BBB",
          ccc:"CCC"
        }

var tmpl = dom.ejs("js_table_tmpl",{
          title:"dom.ejs v7 ",
          name:"司徒正美",
          trs:trs,
          lis:lis,
          href:"http://images.cnblogs.com/cnblogs_com/rubylouvre/202906/o_type4.jpg"
        });
        document.getElementById("js_table_tc").innerHTML = tmpl;
      }
    </script>
  </head>
  <body>

</div>
  </body>
</html>

更新日志

v1
默认界定符为<% %>，当然也可以自定义界定符，只支持当前页面的script元素做模板
http://www.cnblogs.com/rubylouvre/archive/2010/08/10/1796383.html
v2
改进算法提速，比John Resig的 Micro-Templating模板更能应对复杂的模板
http://www.cnblogs.com/rubylouvre/archive/2010/08/22/1805914.html
v3
http://www.cnblogs.com/rubylouvre/archive/2010/08/25/1807789.html
增添了局部模板功能
v4
http://www.cnblogs.com/rubylouvre/archive/2010/08/31/1813122.html
对v3的结构进行优化，支持远程的独立文件做模板
v5
http://www.cnblogs.com/rubylouvre/archive/2010/08/31/1813122.html
尝试新的算法
v6
http://www.cnblogs.com/rubylouvre/archive/2010/10/05/1841933.html
更新默认界定符为<& &>，添加新的操作符<&~，对数据源的第一层属性名添加@前缀
v7
对参数进行多态化，因ejs天生支持模板的相互调用便去除<&:与<&~操作符

参数多态化，四种传参方式

//方式1
dom.ejs("id",{aa:"aaa",bb:"bbb"})
//方式2
dom.ejs("url(http://aaa/tmpl.html)",{aa:"aaa",bb:"bbb"})
//方式3
dom.ejs({
 selector:"id",
 data    : {aa:"aaa",bb:"bbb"}
 });
//方式4
dom.ejs({
 url:"http://aaa/tmpl.html",
 data    : {aa:"aaa",bb:"bbb"}
 })