带有JavaScript验证的php表单
[英]php form with javascript validation
问题描述
i'm working on a registration page. 
我正在注册页面上。 im stuck in this javascript form validation. 即时通讯卡在此javascript表单验证中。 what i want to do is first validate the entered data then pass the value to action page. 我想做的是首先验证输入的数据，然后将值传递到操作页面。 but the validation never works. 但是验证永远无法进行。 i tried removing action and also removing (form) in function and tried passing form but none works. 我试着删除动作，也删除函数中的（表单），并尝试传递表单，但是没有任何效果。
here is my code 这是我的代码
<html>
<head>
<title>Registeration</title>
<script language="javascript">
function regval(form) {
var a = document.forms["regform"]["username"].value;
var b = document.forms["regform"]["password"].value;
if (a == null || a == "") {
alert("Enter username");
return false;
}
if (b == null || b == "") {
alert("enter password");
return false;
}
}
</script>
</head>
<body>
<form name="regform" id="regform" action="registration.php" method="post" onSubmit="return regval();">
<table width="274" border="0" align="center" cellpadding="2" cellspacing="0">
<tr>
<td width="95">
<div align="right">Username:</div>
</td>
<td width="171">
<input type="text" name="username" />
</td>
</tr>
<tr>
<td>
<div align="right">Password:</div>
</td>
<td>
<input type="password" name="password" />
</td>
</tr>
<td>
<div align="right"></div>
</td>
<td>
<input name="submit" type="submit" value="register" onClick="validateForm()" />
</td>
</tr>
</table>
</form>
</body>
</html>
3 个解决方案
解决方案1
2 2015-06-25 05:32:36
if(b==nul||b="")
Should be: 应该：
if(b==null||b=="")
Or shorter: 或更短：
if(!a) { alert("Enter username"); return false; }
if(!b) { alert("Enter password"); return false; }
解决方案2
1 2015-06-25 05:36:12
<html>
<head>
<title>Registeration</title>
<script language="javascript">
function validateForm(form)
{
var a=document.forms["regform"]["username"].value;
var b=document.forms["regform"]["password"].value;
alert(a);
if(a==null || a=="")
{
alert("Enter username");
return false;
}
if(b==nul||b=="")
{
alert("enter password");
return false;
}
}
</script>
</head>
<body>
<form name="regform" id="regform" action="#" method="post" onSubmit="return regval();">
<table width="274" border="0" align="center" cellpadding="2" cellspacing="0">
<tr>
<td width="95"><div align="right">Username:</div></td>
<td width="171"><input type="text" name="username" /></td>
</tr>
<tr>
<td><div align="right">Password:</div></td>
<td><input type="password" name="password" /></td>
</tr>
<td><div align="right"></div></td>
<td><input name="submit" type="submit" value="register" onClick="validateForm()"/></td>
</tr>
</table>
</form>
</body>
</html>
解决方案3
0 2015-06-25 05:39:08
try this code 试试这个代码
function regval(form)
{
var a=document.forms["regform"]["username"].value;
var b=document.forms["regform"]["password"].value;
if(a=="")
{
alert("Enter username");
return false;
}
if(b == "")
{
alert("enter password");
return false;
}
}
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