请问错在那儿呢？

frankrenping 2010-10-06 05:35:51

简单的问题让我看不到，郁闷

<script language="javascript">
function CheckSum()
{
var sum=0;
var totalprice;
for(var i=0;i < document.getElementById["choce"].length;i++);
{
if(document.getElementById["choce"][i].checked);
{
sum = sum + parseInt(document.getElementById["choce"][i].value);
}
}
totalprice.innerText = sum +"元";
}
</script>

<form action="" method="post" name="form1">
<table><tr><td>
<input type="checkbox" id="choce" value="10" onClick="CheckSum()">铅笔 10元</td></tr>
<tr><td><input type="checkbox" id="choce" value="30" onClick="CheckSum()">篮球 30元</td></tr>
<tr><td><input type="checkbox" id="choce" value="40" onClick="CheckSum()">足球 40元</td></tr>
<tr><td><input type="checkbox" id="choce" value="50" onClick="CheckSum()">乒乓球拍 50元</td></tr>
<tr><td><input type="button" name="submit" value="submit" id="submit">
<tr><td>sum price is:<span id="totalprice">0yuan</span> </td></tr>
</table></form>

报错：for(var i=0;i < document.getElementById["choce"].length;i++);为空或不是对象

...全文

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rjzou2006 2010-10-07

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把id换成name
getElementById换成getElementByTagName

修电视的攻城狮 2010-10-07

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id只能是唯一的，你里面太多相同的id了，把id换成name，把getElementById换成getElementByTagName

Sillen 2010-10-06

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顶5楼的

Sillen 2010-10-06

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for(var i=0;i < document.getElementsByName["choce"].length;i++);

lihaoran8577 2010-10-06

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">

<HTML>

 <HEAD>

  <TITLE> New Document </TITLE>

  <META NAME="Generator" CONTENT="EditPlus">

  <META NAME="Author" CONTENT="">

  <META NAME="Keywords" CONTENT="">

  <META NAME="Description" CONTENT="">

 </HEAD>



 <BODY>

  <script language="javascript">

function CheckSum()

{

var sum=0;

var td = document.getElementById("totalprice");

var box=document.getElementsByName("choce");



for(var i=0;i<box.length;i++)

{

	if(box[i].checked)

	{

		sum = sum + parseInt(box[i].value);

		//alert(sum);

	}

}

td.innerText = sum +"元";

}

</script>



<form action="" method="post" name="form1">

<table><tr><td>

<input type="checkbox" name="choce" value="10" onClick="CheckSum()">铅笔 10元</td></tr>

<tr><td><input type="checkbox" name="choce" value="30" onClick="CheckSum()">篮球 30元</td></tr>

<tr><td><input type="checkbox" name="choce" value="40" onClick="CheckSum()">足球 40元</td></tr>

<tr><td><input type="checkbox" name="choce" value="50" onClick="CheckSum()">乒乓球拍 50元</td></tr>

<tr><td><input type="button" name="submit" value="submit" id="submit">

<tr><td>sum price is:<span id="totalprice">0yuan</span> </td></tr>

</table></form>

 </BODY>

</HTML>

frankrenping 2010-10-06

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改成:
<script language="javascript">
function CheckSum()
{
var sum=0;
var totalprice;
for(var i=0;i < document.form1.elements["choce"].length;i++);
{
if(document.form1.elements["choce"][i].checked);
{
sum = sum + parseInt(document.form1.elements["choce"][i].value);
}
}
totalprice.innerText = sum +"元";
}
</script>

<form action="" method="post" name="form1">
<table><tr><td>
<input type="checkbox" name="choce" value="10" onClick="CheckSum()">铅笔 10元</td></tr>
<tr><td><input type="checkbox" name="choce" value="30" onClick="CheckSum()">篮球 30元</td></tr>
<tr><td><input type="checkbox" name="choce" value="40" onClick="CheckSum()">足球 40元</td></tr>
<tr><td><input type="checkbox" name="choce" value="50" onClick="CheckSum()">乒乓球拍 50元</td></tr>
<tr><td><input type="button" name="submit" value="submit" id="submit">
<tr><td>sum price is:<span id="totalprice">0yuan</span> </td></tr>
</table></form>
同样保错：
if(document.form1.elements["choce"][i].checked);为空或不是对象