如何在php中的相同按钮上设置会话变量和验证

I'm a newbie in php. I want to validate a form and set the form data to the session variables so as to use them onto next page. here is the code,

<?php
session_start();
?>
<html>
<head>
<script type="text/javascript">
function val(){
    var n=document.f.cname.value;
    if(n==""||n==null){
        alert("Please enter name field.");
        return false;
    }
}
</script>
</head>
<body>
<form method="post" action="<?php $_Php_SELF?>" onsubmit="return val()">
name : <input type="text" name="cname" />
<input type="Submit" name="submit" value="Sub"/>
</form>
<?php
if(isset($_POST['submit'])){
    $_SESSION['caname']=$_POST['cname'];
    header("location:sessiontest2.php");
}
?>
</body>
</html>

The second page just echos the session variable. Without validation it works fine.

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2条回答默认最新

dqvtm82066 2017-06-04 16:00

关注

Handle your redirection before the html part. Also fixed your code.

<?php
session_start();

if(isset($_POST['submit'])){
    $_SESSION['caname'] = $_POST['cname'];
    header("location:sessiontest2.php");
}
?>
<html>
<body>
<form name="myForm" method="post" action="<?= $_SERVER['PHP_SELF']?>" onsubmit="return validate()">
    Name : <input type="text" name="cname"/>
    <input type="Submit" name="submit" value="Sub"/>
</form>
<script type="text/javascript">
    function validate() {
        var name = document.forms["myForm"]["cname"].value;

        if(name.length === 0){
            alert("Please enter the name");
            return false;
        }
    }
</script>
</body>
</html>

本回答被题主选为最佳回答 , 对您是否有帮助呢?