Js实现鼠标点击时自动选中文本框文本,相信许多朋友都遇到这种功能的,就是当我们点击文本框的时候,文本框中默认的文字会被全部选中,这样你不用再去刻意选择了,省去了一些麻烦,提高了输入效率,用户肯定会喜欢这功能,那么实现的方法是怎么样呢?通过本代码你就搞明白了。 效果如图:

全部代码如下:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>自动选择文本框/编辑框中的文字</title>
<script type="text/javascript">
function Myselect_txt(){
if (document.form1.title.focus){
document.form1.title.select();}
}
function Myselect_txtarea(){
if (document.form1.content.focus){
document.form1.content.select();}
}
window.onload = function(){
var title = document.getElementById("title");
var content = document.getElementById("content");
title.onclick = function(){
Myselect_txt();
}
content.onclick = function(){
Myselect_txtarea();
}
}
</script>
</head>
<body style="font-size:12px">
<table width="443" height="97" border="0" align="center" cellpadding="0" cellspacing="0" bgcolor="#f9f9f9">
<form name="form1">
<tr bgcolor="#214994">
<td height="25" colspan="2"><div align="center"><font color="#FFFFFF">新闻信息修改</font></div></td>
</tr>
<tr>
<td width="80" height="28"><div align="right"><font color="#214994">新闻标题:</font></div></td>
<td width="363"><input id="title" name="title" type="text" size="50" value="今日新闻头条"></td>
</tr>
<tr>
<td height="20"><div align="right"><font color="#214994">新闻内容:</font></div></td>
<td rowspan="2"><textarea id="content" name="content" cols="50" rows="6">今日,据相关方面报道,...</textarea></td>
</tr>
<tr>
<td height="10"> </td>
</tr>
<tr>
<td height="32" colspan="2">
<div align="center">
<input name="add" type="submit" id="add" value="添加">
<input name="Submit" type="reset" value="重置">
</div></td>
</tr>
</form>
</table>
</body>
</html>
JS代码:
<script type="text/javascript">
function Myselect_txt(){
if (document.form1.title.focus){
document.form1.title.select();}
}
function Myselect_txtarea(){
if (document.form1.content.focus){
document.form1.content.select();}
}
window.onload = function(){
var title = document.getElementById("title");
var content = document.getElementById("content");
title.onclick = function(){
Myselect_txt();
}
content.onclick = function(){
Myselect_txtarea();
}
}
</script>