javascript获得光标所在的文本框(text/textarea)中的位置

时间:2020-05-12 人气:0

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> 
<title>js获得光标所在的文本框(text/textarea)中的位置</title> 
<script type="text/javascript"> 
function getPosition(obj){ 
var result = 0; 
if(obj.selectionStart){ //IE以外 
result = obj.selectionStart 
}else{ //IE 
var rng; 
if(obj.tagName == "textarea"){ //TEXTAREA 
rng = event.srcElement.createTextRange(); 
rng.moveToPoint(event.x,event.y); 
}else{ //Text 
rng = document.selection.createRange(); 
} 
rng.moveStart("character",-event.srcElement.value.length); 
result = rng.text.length; 
} 
return result; 
} 
function getValue(obj){ 
var pos = getPosition(obj); 
alert(obj.value.substr(0,pos)+"[输入内容]"+obj.value.substr(pos,obj.value.length)); 
} 
</script> 
</head> 
<body> 
<input type="text" value="HELLO jb51" onmouseup="getValue(this)" style="display:block"> 
<textarea rows="6" cols="60" onmouseup="getValue(this)">jb51 HELLO!</textarea> 
</body> 
</html>

[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]

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