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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>枫芸志 » 在文本框的指定位置插入文本并定位光标</title>
<script type="text/javascript">
function InsertString(tbid, str){
var tb = document.getElementById(tbid);
tb.focus();
if (document.all){
var r = document.selection.createRange();
document.selection.empty();
r.text = str;
r.collapse();
r.select();
}
else{
var newstart = tb.selectionStart+str.length;
tb.value=tb.value.substr(0,tb.selectionStart)+str+tb.value.substring(tb.selectionEnd);
tb.selectionStart = newstart;
tb.selectionEnd = newstart;
}
}
function GetSelection(tbid){
var sel = ‘‘;
if (document.all){
var r = document.selection.createRange();
document.selection.empty();
sel = r.text;
}
else{
var tb = document.getElementById(tbid);
// tb.focus();
var start = tb.selectionStart;
var end = tb.selectionEnd;
sel = tb.value.substring(start, end);
}
return sel;
}
function ShowSelection(tbid){
var sel = GetSelection(tbid);
if (sel)
alert(‘选中的文本是：‘+sel);
else
alert(‘未选择文本！‘);
}
</script>
</head>
<body>
<form><textarea id="txtContent" cols="50" rows="5">先在本文框中点击鼠标或选择文本以确定光标位置和选取内容。</textarea><br /><br />
<input type = "button" value = "插入字符串 {Good}" onclick="InsertString(‘txtContent‘, ‘{Good}‘);"/>
<input type = "button" value = "插入字符串 {Bad}" onclick="InsertString(‘txtContent‘, ‘{Bad}‘);"/>
<input type = "button" value = "获取选中的文本" onclick="ShowSelection(‘txtContent‘);"/><br />
<div id="tip"></div>
</form>
</body>
</html>
【Javascript】在文本框光标处插入文字并定位光标 (转)
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原文地址：http://www.cnblogs.com/gaving10/p/4388911.html
