Question

js 如何获取文本框中光标索引位置?

比如文本框中有abcde,目前光标在最后,索引为5,现在用鼠标点在c后面点一下,索引应该为3,怎么样可以用js获取这个3呢...

Answer 1

<script>
function getTxt1CursorPosition(){
var oTxt1 = document.getElementById("txt1");
var cursurPosition=-1;
if(oTxt1.selectionStart){//非IE浏览器
cursurPosition= oTxt1.selectionStart;
}else{//IE
var range = document.selection.createRange();
range.moveStart("character",-oTxt1.value.length);
cursurPosition=range.text.length;
}
alert(cursurPosition);
}
</script>
<input type="text" id="txt1" value="abcde" onclick="getTxt1CursorPosition()">