如何在提交表单时将PHP变量传递给Javascript cookie？

问题描述：

I am setting up a custom form to be used in my wordpress site. What I would like to do is grab the AUTO_INCREMENT ID of that submission and pass it into a Javascript cookie when the form is submitted. Currently the ID is working, but because the ID isn't grabbed until after the form is submitted, I'm having trouble figuring out how I can pass the variable into the cookie immediately after the form has been submitted(currently I have to submit the form twice before the cookie with the ID is created, and its 1 number lower than it should be since it's a submission behind).

Here's what I have currently:

<?php
if(isset($_POST["submit"])) {
    $name = $_POST['full_name'];
    $city = $_POST['city'];
    $state = $_POST['state'];
    $email = $_POST['email'];

    $wpdb->insert(
        'reps',
        array(
            'name' => stripslashes($name),
            'city' => stripslashes($city),
            'state' => stripslashes($state),
            'email' => stripslashes($email)
        )
    );

    $lastid = $wpdb->insert_id;
}
?>
<script>
$('#dealer-form').submit(function() {
    var repID = '<?php echo $lastid ?>';
    setCookie('ID', repID);
});
</script>

As I mentioned this code works on the second submission(since the variable has no value on the first submission), and the ID is 1 number behind because it is grabbing the ID of the previous submission before reassigning the variable value.

我正在设置一个自定义表单，用于我的wordpress网站。我想要做的是获取该提交的AUTO_INCREMENT ID，并在提交表单时将其传递给Javascript cookie。目前ID正在运行，但由于在提交表单之前不会抓取ID，因此我无法确定如何在表单提交后立即将变量传递到cookie中（目前我必须提交在创建带有ID的cookie之前两次使用该表单，并且它的1位数应该低于它应该是因为它是后面提交的。） p>

这是我目前所拥有的： p> \ n

 ＆lt;？php 
if（isset（$ _ POST [“submit”]））{
 $ name = $ _POST ['full_name']; 
 $ city = $ _POST ['  city']; 
 $ state = $ _POST ['state']; 
 $ email = $ _POST ['email']; 
 
 $ wpdb-＆gt; insert（
'reps'，
 array  （
'name'=＆gt; stripslashes（$ name），
'city'=＆gt; stripslashes（$ city），
'state'=＆gt; stripslashes（$ state），
'email'=＆gt  ; stripslashes（$ email）
）
）; 
 
 $ lastid = $ wpdb-＆gt; insert_id; 
} 
？＆gt; 
＆lt; script＆gt; 
 $（'＃dealer-form'  ）.submit（function（）{
 var repID ='＆lt;？php ec  ho $ lastid？＆gt;'; 
 setCookie（'ID'，repID）; 
}）; 
＆lt; / script＆gt; 
  code>  pre> 
 
 正如我所提到的 此代码适用于第二次提交（因为变量在第一次提交时没有值），并且ID后面是1个数字，因为它在重新分配变量值之前抓取先前提交的ID。   p> 
  div>

答

PHP, being a server-side scripting language, is executed before the data is sent to your browser. JavaScript, a client-side scripting language, is executed as soon as the script is encountered by the browser.

Your approach is forgetting this separation between front- and back-end.

To accomplish what you're trying to do, simply output the setCookie call when you've submitted your form in php:

<?php
    if(isset($_POST["submit"])) {
        $name = $_POST['full_name'];
        $city = $_POST['city'];
        $state = $_POST['state'];
        $email = $_POST['email'];

        $wpdb->insert(
            'reps',
            array(
                'name' => stripslashes($name),
                'city' => stripslashes($city),
                'state' => stripslashes($state),
                'email' => stripslashes($email)
            )
        );

        $lastid = $wpdb->insert_id;

        printf( '<script>setCookie("ID", %d);</script>', $lastid );
    }
?>

如何在提交表单时将PHP变量传递给Javascript cookie？

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