我想实现javascript 验证失败的话，不能提交表单，这个该如何实现呢，还请各位大侠赐教！
functioncheckform(form){vars_n=operation_form.stu_num.value;varc_n=operation_form.cel...
function checkform(form)
{var s_n=operation_form.stu_num.value;
var c_n=operation_form.cellphone.value;
if (operation_form.stu_num.value=="" )
{
alert("提交失败，账号不能为空");
myform.user.focus();
return false;
}
if (operation_form.cellphone.value=="")
{
alert("提交失败，必须要填写用户的联系方式");
operation_form.cellphone.focus();
return false;
}
if (operation_form.stu_num.value=="" || operation_form.stu_num.value.length>11)
{
alert('提交失败，账号不能为空且账号长度小于11位');
operation_form.stu_num.focus();
return false;
}
if(isNaN(s_n))
{
alert('提交失败，账号须为数字，请检查！');
operation_form.stu_num.focus();
return false;
}
if (operation_form.cellphone.value=="" || operation_form.cellphone.value.length>11)
{
alert('提交失败，联系方式不能为空且账号长度小于11位');
operation_form.cellphone.focus();
return false;
}
if(isNaN(c_n))
{
alert('提交失败，联系方式须为数字，请检查！');
operation_form.cellphone.focus();
return false;
}
else
{ return true;}
}
</SCRIPT>
<form action='add.php' method='post' name='operation_form' onsubmit="return checkform(this.form);">
if($_POST[submit])
{
var_dump($_POST[submit]);
echo "<br/>";
$pas=' ';
$pass_sec=md5($pass);
if($pass_sec!=md5($pas))
{
echo "<script language=\"javascript\">alert('密码错误，提交失败！');history.go(-1)</script>";
}
else
{
echo "<script language=\"javascript\">alert('密码正确');</script>";
该代码执行后，假如我输入密码正确后，即使用户名为空，却可以能执行index.php,我想实现假如我没有填写用户名，就不能提交表单执行PHP 展开
{var s_n=operation_form.stu_num.value;
var c_n=operation_form.cellphone.value;
if (operation_form.stu_num.value=="" )
{
alert("提交失败，账号不能为空");
myform.user.focus();
return false;
}
if (operation_form.cellphone.value=="")
{
alert("提交失败，必须要填写用户的联系方式");
operation_form.cellphone.focus();
return false;
}
if (operation_form.stu_num.value=="" || operation_form.stu_num.value.length>11)
{
alert('提交失败，账号不能为空且账号长度小于11位');
operation_form.stu_num.focus();
return false;
}
if(isNaN(s_n))
{
alert('提交失败，账号须为数字，请检查！');
operation_form.stu_num.focus();
return false;
}
if (operation_form.cellphone.value=="" || operation_form.cellphone.value.length>11)
{
alert('提交失败，联系方式不能为空且账号长度小于11位');
operation_form.cellphone.focus();
return false;
}
if(isNaN(c_n))
{
alert('提交失败，联系方式须为数字，请检查！');
operation_form.cellphone.focus();
return false;
}
else
{ return true;}
}
</SCRIPT>
<form action='add.php' method='post' name='operation_form' onsubmit="return checkform(this.form);">
if($_POST[submit])
{
var_dump($_POST[submit]);
echo "<br/>";
$pas=' ';
$pass_sec=md5($pass);
if($pass_sec!=md5($pas))
{
echo "<script language=\"javascript\">alert('密码错误，提交失败！');history.go(-1)</script>";
}
else
{
echo "<script language=\"javascript\">alert('密码正确');</script>";
该代码执行后，假如我输入密码正确后，即使用户名为空，却可以能执行index.php,我想实现假如我没有填写用户名，就不能提交表单执行PHP 展开
1个回答
展开全部
<!DOCTYPE HTML>
<html>
<head>
<meta charset=UTF-8>
<meta name="keywords" content="白菜编辑部">
<title>白菜编辑部</title>
<style type="text/css">
table {
border: 1px solid black;
border-collapse: collapse;
}
td {
border: 1px solid black;
}
</style>
<script type="text/javascript">
function checkform (form)
{
var reg = /^\s*|\s*$/g;
var stuname = form.stu_num.value.replace(reg, '');
var cellphone = form.cellphone.value.replace(reg, '');
if (stuname === "")
{
alert ("提交失败，账号不能为空!");
form.stu_num.focus ();
form.stu_num.value = '';
return false;
}
else if (!/^\d+$/.test(stuname))
{
alert ('提交失败，账号须为数字，请检查!');
form.stu_num.focus ();
form.stu_num.select();
return false;
}
else if (/.{11,}/.test(stuname))
{
alert ('提交失败，账号长度必须小于11位!');
form.stu_num.focus ();
form.stu_num.select();
return false;
}
else if (cellphone === "")
{
alert ("提交失败，必须要填写用户的联系方式!");
form.cellphone.focus ();
form.cellphone.value = '';
return false;
}
else if (!/^\d+$/.test(cellphone))
{
alert ('提交失败，联系方式须为数字，请检查！');
form.cellphone.focus ();
form.cellphone.select();
return false;
}
else if (/.{11,}/.test(cellphone))
{
alert ('提交失败，联系方式长度必须小于11位!');
form.cellphone.focus ();
form.cellphone.select();
return false;
}
else
{
return true;
}
}
</script>
</head>
<body>
<form action="add.php" method="post" name="operation_form" onsubmit="return checkform(this);">
<table>
<tr>
<td>账号:</td>
<td><input type="text" name="stu_num" /></td>
</tr>
<tr>
<td>联系方式:</td>
<td><input type="text" name="cellphone" /></td>
</tr>
<tr>
<td colspan="2" style="text-align: center;"><input type="submit" value="submit" /> <input type="reset" value="reset" /></td>
</tr>
</table>
</form>
</body>
</html>
追问
谢谢，我上面的代码，哪里出了问题，导致重复执行
追答
onsubmit 方法参数不当
if else if 使用不当
验证不当
等等
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