Text selection in div(contenteditable) when double click

背景：

     在最近项目中，碰到一个问题：有一个可编辑的div需要双击时可编辑，blur或者回车时将编辑结果保存。你可能注意到双击时，文字会被选中，可编辑区域不会focus到光标位置。考虑到兼容性问题，写了如下代码。做个备份，以备不时之需。

js:

 1 function getMouseEventCaretRange(evt) {
 2     
 3     var range, x = evt.clientX, y = evt.clientY;
 4     
 5         // Try the simple IE way first
 6         if (document.body.createTextRange) {
 7             range = document.body.createTextRange();
 8             range.moveToPoint(x, y);
 9         }
10     
11     else if (typeof document.createRange != "undefined") {
12         // Try Mozilla's rangeOffset and rangeParent properties, which are exactly what we want
13         
14         if (typeof evt.rangeParent != "undefined") {
15             range = document.createRange();
16             range.setStart(evt.rangeParent, evt.rangeOffset);
17             range.collapse(true);
18         }
19     
20         // Try the standards-based way next
21         else if (document.caretPositionFromPoint) {
22             var pos = document.caretPositionFromPoint(x, y);
23             range = document.createRange();
24             range.setStart(pos.offsetNode, pos.offset);
25             range.collapse(true);
26         }
27     
28         // Next, the WebKit way
29         else if (document.caretRangeFromPoint) {
30             range = document.caretRangeFromPoint(x, y);
31         }
32     }
33     
34     return range;
35 }
36 
37 function selectRange(range) {
38     if (range) {
39         if (typeof range.select != "undefined") {
40             range.select();
41         } else if (typeof window.getSelection != "undefined") {
42             var sel = window.getSelection();
43             sel.removeAllRanges();
44             sel.addRange(range);
45         }
46     }
47 }
48 
49 document.getElementById("editor").ondblclick = function(evt) {
50     evt = evt || window.event;
51     this.contentEditable = true;
52     this.focus();
53         var caretRange = getMouseEventCaretRange(evt);
54       // Set a timer to allow the selection to happen and the dust settle first
55     window.setTimeout(function() {
56         selectRange(caretRange);
57     }, 0);
58   
59     return false;
60 };

html:

1 <div id="editor" contenteditable="false">Some editable text. Double click to edit</div>

 

posted @ 2013-07-27 22:15  城池  阅读(884)  评论(0)  编辑  收藏  举报