看起来似乎与 form 没啥关系呀?!不就是一个 select 的 onchange 事件么?对了,lz 还把俺加为好友,有没有红包呀,哈L@_@K<!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>
<title> select.onchange </title>
<meta name="generator" content="editplus" />
<meta name="author" content="[email protected]" />
<meta name="keywords" content="javascript" />
<meta name="description" content="for javascript region of csdn" />
</head> <body>
<table>
<form action="" method="post">
<tr>
<td>
<select size="1" name="mySelect" onchange="xxx(this);">
<option value="1" selected>1
<option value="2">2
<option value="3">3
</select>
</td>
<td><div id="mydiv" style="display: none;">***</div></td>
</tr>
</form>
<form action="" method="post">
<tr>
<td>
<select size="1" name="mySelect" onchange="xxx(this);">
<option value="1" selected>1
<option value="2">2
<option value="3">3
</select>
</td>
<td><div id="mydiv" style="display: none;">***</div></td>
</tr>
</form>
<form action="" method="post">
<tr>
<td>
<select size="1" name="mySelect" onchange="xxx(this);">
<option value="1" selected>1
<option value="2">2
<option value="3">3
</select>
</td>
<td><div id="mydiv" style="display: none;">***</div></td>
</tr>
</form>
</table>
<script type="text/javascript">
<!--
var colSelect = document.getElementsByTagName("select");
for (var i=0; i<colSelect.length; i++)
{
colSelect[i].defaultIndex = colSelect[i].selectedIndex;
}function xxx(currentSel)
{
var nextSiblingTd = currentSel.parentNode.nextSibling;
var oDiv = nextSiblingTd.firstChild;
if (currentSel.defaultIndex==currentSel.selectedIndex)
{
oDiv.style.display = "none";
}
else
{
oDiv.style.display = "block";
}
}
//-->
</script>
</body>
</html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title> select.onchange </title>
<meta name="generator" content="editplus" />
<meta name="author" content="[email protected]" />
<meta name="keywords" content="javascript" />
<meta name="description" content="for javascript region of csdn" />
</head> <body>
<table>
<form action="" method="post">
<tr>
<td>
<select size="1" name="mySelect" onchange="xxx(this);">
<option value="1" selected>1
<option value="2">2
<option value="3">3
</select>
</td>
<td><div id="mydiv" style="display: none;">***</div></td>
</tr>
</form>
<form action="" method="post">
<tr>
<td>
<select size="1" name="mySelect" onchange="xxx(this);">
<option value="1" selected>1
<option value="2">2
<option value="3">3
</select>
</td>
<td><div id="mydiv" style="display: none;">***</div></td>
</tr>
</form>
<form action="" method="post">
<tr>
<td>
<select size="1" name="mySelect" onchange="xxx(this);">
<option value="1" selected>1
<option value="2">2
<option value="3">3
</select>
</td>
<td><div id="mydiv" style="display: none;">***</div></td>
</tr>
</form>
</table>
<script type="text/javascript">
<!--
var colSelect = document.getElementsByTagName("select");
for (var i=0; i<colSelect.length; i++)
{
colSelect[i].defaultIndex = colSelect[i].selectedIndex;
}function xxx(currentSel)
{
var nextSiblingTd = currentSel.parentNode.nextSibling;
var oDiv = nextSiblingTd.firstChild;
if (currentSel.defaultIndex==currentSel.selectedIndex)
{
oDiv.style.display = "none";
}
else
{
oDiv.style.display = "block";
}
}
//-->
</script>
</body>
</html>
form.mydiv这种写法只能获取<input type="..." 或 <select> <textarea>之类的表单控件的值,对于象div,table,span,link这样的用于显示的对象要用document.getElementById,或document.getElementByName,document.getElementsByTagName来获取.这就是你失败的原因.建议你看看dom操作的狸子
<script language="javascript">
function showchange(oTr){
alert(oTr.tagName);
oTr.cells[1].innerHTML="您已经修改了"
}
</script>
<table id="mytable">
<form action="" method="post">
<tr>
<td>
<select size="1" name="mySelect" onchange="showchange(this.parentNode.parentNode)">
<option value="1" selected>1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
</td>
<td>
当select的值有了改变的时候这样就显示相应的文字提示select的值改变了,比如显示“***”。
</td>
</tr>
</form>
<form action="" method="post">
<tr>
<td>
<select size="1" name="mySelect" onchange="showchange(this.parentNode.parentNode)">
<option value="1" selected>1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
</td>
<td>
当select的值有了改变的时候这样就显示相应的文字提示select的值改变了,比如显示“***”。
</td>
</tr>
</form>
<form action="" method="post">
<tr>
<td>
<select size="1" name="mySelect" onchange="showchange(this.parentNode.parentNode)">
<option value="1" selected>1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
</td>
<td>
当select的值有了改变的时候这样就显示相应的文字提示select的值改变了,比如显示“***”。
</td>
</tr>
</form>
<form action="" method="post">
<tr>
<td>
<select size="1" name="mySelect" onchange="showchange(this.parentNode.parentNode)">
<option value="1" selected>1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
</td>
<td>
当select的值有了改变的时候这样就显示相应的文字提示select的值改变了,比如显示“***”。
</td>
</tr>
</form>
</table>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title> select.onchange </title>
<meta name="generator" content="editplus" />
<meta name="author" content="[email protected]" />
<meta name="keywords" content="javascript" />
<meta name="description" content="for javascript region of csdn" />
</head> <body>
<table>
<form action="" method="post">
<tr>
<td>
<select size="1" name="mySelect" onchange="xxx(this);">
<option value="1" selected>1
<option value="2">2
<option value="3">3
</select>
</td>
<td><div id="mydiv" style="display: none;">1 ***</div></td>
</tr>
</form>
<form action="" method="post">
<tr>
<td>
<select size="1" name="mySelect" onchange="xxx(this);">
<option value="1">1
<option value="2" selected>2
<option value="3">3
</select>
</td>
<td><div id="mydiv" style="display: none;">2 ***</div></td>
</tr>
</form>
<form action="" method="post">
<tr>
<td>
<select size="1" name="mySelect" onchange="xxx(this);">
<option value="1">1
<option value="2">2
<option value="3" selected>3
</select>
</td>
<td><div id="mydiv" style="display: none;">3 ***</div></td>
</tr>
</form>
</table>
<script type="text/javascript">
<!--
var colSelect = document.getElementsByTagName("select");
for (var i=0; i<colSelect.length; i++)
{
colSelect[i].defaultIndex = colSelect[i].selectedIndex;
}function xxx(currentSel)
{
var oDiv = currentSel.form.all.mydiv;
if (currentSel.defaultIndex==currentSel.selectedIndex)
{
oDiv.style.display = "none";
}
else
{
oDiv.style.display = "block";
}
}
//-->
</script>
</body>
</html>
对了 什么是红包啊 就是给分吗 不知道啊 呵呵