Question

如何在Internet Explorer 8及更低版本中获得与range.startOffset相同的功能？

即，我想要一个函数，我可以在一个范围内调用，它会告诉我容器中有多少个字符开始。

Answer 1

如果你想在IE中实现DOM Range，你可以使用我的Rangy库：http://code.google.com/p/rangy/。

var range = rangy.getSelection().getRangeAt(0);
alert(range.startOffset);

Answer 2

这里是一个示例代码，请参阅内部的注释：

<html>
<head>
<title>Test</title>
<script type="text/javascript">
<!--
function fx()
{  
    //create a range of selection
  var rng = document.selection.createRange();
    //if nothing is selected return null
  if(rng.text=='')return null;
    //create a second range of selection
  var rng2 = document.selection.createRange();
    //let the 2nd range  encompass the whole element
  rng2.moveToElementText(rng.parentElement())
    //move the end-point of the 2nd range to the start-point of the 1st range
  rng2.setEndPoint('EndToStart', rng);
    //return the length of the text in the 2nd range
  return(rng2.text.length);
}
//-->
</script>
</head>
<body>
<input type="button" onclick="alert(fx())" value="select some text below and then click me">
<p>1234<b style="color:red">5678</i>90</p>
</body>
</html>

Internet Explorer等效range.startOffset

2 个答案: