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js獲取光標位置和設置文本框光標位置示例代碼

 更新時間：2014年01月09日 16:48:31   作者：  
本實例描述了如何用Javascript來控制和獲取文本框/文本域的鼠標光標位置，以下代碼兼容IE和Chrome，F(xiàn)irefox，大家參考使用吧

復制代碼 代碼如下:

<script type="text/javascript">
        function getTxt1CursorPosition(){
            var oTxt1 = document.getElementById("txt1");
            var cursurPosition=-1;
            if(oTxt1.selectionStart){//非IE瀏覽器
                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){
            var oTxt1 = document.getElementById("txt2");
            var cursurPosition=-1;
            if(oTxt1.selectionStart){//非IE瀏覽器
                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瀏覽器
                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瀏覽器
                oTa2.selectionStart=i;
                oTa2.selectionEnd=i;
            }else{//IE
                var range = oTa2.createTextRange();
                range.move("character",i);
                range.select();
            }
        }
    </script>

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