Javascript文字范围直至插入符号位置

Question

I am using IE 8 and I would like to create a text range in a contenteditable div which should include all text until caret position (known to me in the editableDiv). So far I was able to select all text inside my the div:

 function myFunction(editableDiv, cursorPosition)
 {
    if (document.selection) {
       var range = document.body.createTextRange();
        range.moveToElementText(editableDiv);            
        range.collapse(false);
        range.select();
    }
 }

<div id="myDiv" runat="server" contenteditable="true">

But how can I create a text range that begins with the first character in the div and lasts up to caret position? Thank you very much.

Answer 1

Use the setEndPoint() method of TextRange :

var caretRange = document.selection.createRange();
var preCaretRange = document.body.createTextRange();
preCaretRange.moveToElementText(editableDiv);
preCaretRange.setEndPoint("EndToStart", caretRange);

Obviously you'll need different code for non-IE browsers.