js获取光标位置和设置文本框光标位置

来源：互联网发布：js obj 获取value 编辑：程序博客网时间：2024/04/30 09:48

用Javascript来控制和获取文本框/文本域的鼠标光标位置，以下代码兼容IE和Chrome，Firefox。

代码:

<script type="text/javascript">        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);        }        function setTxt1CursorPosition(i){ www.jbxue.com            var oTxt1 = document.getElementById("txt2");            var cursurPosition=-1;            if(oTxt1.selectionStart){//非IE浏览器                oTxt1.selectionStart=i;            }else{//IE                var range = oTxt1.createTextRange();                range.move("character",i);                range.select();            }        }        function getTa1CursorPosition(){            var evt =window.event?window.event:getTa1CursorPosition.caller.arguments[0];            var oTa1 = document.getElementById("ta1");            var cursurPosition=-1;            if(oTa1.selectionStart){//非IE浏览器                cursurPosition= oTa1.selectionStart;            }else{//IE                var range = oTa1.createTextRange();                range.moveToPoint(evt.x,evt.y);                range.moveStart("character",-oTa1.value.length);                cursurPosition=range.text.length;            }            alert(cursurPosition);        }        function setTa1CursorPosition(i){            var oTa2 = document.getElementById("ta2");            if(oTa2.selectionStart){//非IE浏览器                oTa2.selectionStart=i;                oTa2.selectionEnd=i;            }else{//IE                var range = oTa2.createTextRange();                range.move("character",i);                range.select();            }        }    </script>

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