Pass PHP variable to Javascript and back to PHP?

Question

I got a PHP variable called $author_email which I want to pass to a Javascript function which I call via HTML on button clickonclick="searchEmail();" Can I pass the variable to Javascript but doing this instead? onclick="searchEmail('<?php echo $author_email?>');"

Then I want to use this in my javascript function to pass it to the PHP function it calls via AJAX.

This is the Javascript function searchEmail:

function searchEmail() {
  var admin_url = admin_ajax.ajaxurl;
  $.ajax({
    type: "POST",
    url: admin_url,
    datatype: "html",
    data: {'action': 'search_notify_email'},
    success: function() {
      searchNotification();
    },error:function() {
      searchNotificationError();
    }
  });
}

The javascript fires the PHP function search_notify_email I now want to pass the variable to the PHP function. How is this done? Which looks like this:

function search_notify_email(){
    $to = $author_email;
    $subject = "Test title";
    $message = "message message message message message message message ";
    $headers[] = 'From: Test <[email protected]>';

    if( wp_mail($to, $subject, $message, $headers) ){
      // Success
    } else {
      // Error
    }
    die();
}
add_action('wp_ajax_nopriv_search_notify_email', 'search_notify_email');
add_action('wp_ajax_search_notify_emaill', 'search_notify_email');

As you can see my goal is to use the $author_email in the last PHP function. And the reason I cannot pass it directly is because this variable depends on which button is clicked.

Barmar · Accepted Answer · 2019-02-14 10:06:59Z

3

Change searchEmail to use the parameter:

function searchEmail(email) {
  var admin_url = admin_ajax.ajaxurl;
  $.ajax({
    type: "POST",
    url: admin_url,
    datatype: "html",
    data: {'action': 'search_notify_email', email: email},
    success: function() {
      searchNotification();
    },error:function() {
      searchNotificationError();
    }
  });
}

Then change the controller to use that parameter.

function search_notify_email(){
    $to = $_POST['email'];
    $subject = "Test title";
    $message = "message message message message message message message ";
    $headers[] = 'From: Test <[email protected]>';

    if( wp_mail($to, $subject, $message, $headers) ){
      // Success
    } else {
      // Error
    }
    die();
}

There's probably a more WordPressy way to get the parameter, but I don't know WordPress.

answered Feb 14, 2019 at 10:06

Barmar

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13 Comments

joq3 Over a year ago

But how is the PHP variable $author_email transfered to the javascript? Is this way of doing it correct? onclick="searchEmail('<?php echo $author_email?>');"

Barmar Over a year ago

yes, that's fine. That's why I didn't put it into the answer.

joq3 Over a year ago

But what I don't understand is how is this translated in to email in the javascript function?

Barmar Over a year ago

Maybe you need to read a tutorial on how functions work. This is basically the same in all programming languages.

Barmar Over a year ago

Did you change the data: option in the AJAX call as I showed?

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