function ValidateOrder()
{
if (document.form.jh.value == "")
{
alert("井号不能为空");
document.form.jh.focus();
return;
}
document.form.submit();
}
{
if (document.form.jh.value == "")
{
alert("井号不能为空");
document.form.jh.focus();
return;
}
document.form.submit();
}
==>
<script language="JavaScript">
<html>
<title>表单提交前最后的检查 </title>
<script language=javascript><!--
function check(obj)
{
for(i=0;i<form1.elements.length;i++)
{
if(form1.elements[i].value==""){
alert("Fill out");
return false
}
}
}
--></script>
<body>
<form name="form1" onsubmit="return check(this)">
Please enter your name:<input type=text name="firstname"><br>
<input type="submit">
</form>
</body>
</html>
<html>
<head>
<title>查询原油物性</title>
<script language="javascript">
function ValidateOrder()
{
if (document.frm.jh.value == "")
{
alert("井号不能为空");
document.frm.jh.focus();
return false;
}
//document.frm.submit();
}
</script>
</head><body><table border="0" width="100%">
<tr>
<td width="100%">
<p align="center">查询原油物性</td>
</tr>
<tr>
<td width="100%">输入井号:
<form method="POST" action="" name="frm">
<!--输入井号 -->
<input type="text" name="jh" size="20" style="font-size=9pt" title="必须填入井号">
<input type=button value="提交" name="submitok" onclick="ValidateOrder();">
</form>
</td>
</tr>
</table>
</body>
</html>