JS在textarea光标处插入文本的小例子

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我是靠谱客的博主怕孤独鸡，最近开发中收集的这篇文章主要介绍JS在textarea光标处插入文本的小例子，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

下面是代码:

复制代码代码如下:

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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>JS在文本域鼠标指定位置插入文本-柯乐义</title>
<script type="text/javascript">
function insertAtCursor(myField, myValue) {
//IE support
if (document.selection) {
myField.focus();
sel = document.selection.createRange();
sel.text = myValue;
sel.select();
}
//MOZILLA/NETSCAPE support 
else if (myField.selectionStart || myField.selectionStart == '0') {
var startPos = myField.selectionStart;
var endPos = myField.selectionEnd;
// save scrollTop before insert www.keleyi.com
var restoreTop = myField.scrollTop;
myField.value = myField.value.substring(0, startPos) + myValue + myField.value.substring(endPos, myField.value.length);
if (restoreTop > 0) {
myField.scrollTop = restoreTop;
}
myField.focus();
myField.selectionStart = startPos + myValue.length;
myField.selectionEnd = startPos + myValue.length;
} else {
myField.value += myValue;
myField.focus();
}
} 
</script>
</head>
<body>
<div style="width:500px;margin-left:auto;margin-right:auto;margin-top:100px;">
<textarea id="keleyi_com" style="width:340px; height:180px">
柯乐义 Javascript 在textarea光标处插入文本
</textarea>
<input type="button" onclick="insertAtCursor(document.getElementById('keleyi_com'),'www.keleyi.com')" value="插入文本" />
</div></body>
</html>