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Passing variable data from external jQuery file to options.php

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I'm setting up a plugin that requires passing of a variable from a stand alone jQuery file to options.php. I have (I think) set up the scripts to be used in my plugin file like so:

function ndw_js_init(){     wp_enqueue_script('jquery');     wp_register_script( 'ndw_js', plugin_dir_url( __FILE__ ) . '/ndw_js.js', array( 'jquery' ), '', true );     wp_enqueue_script( 'ndw_js', plugin_dir_url( __FILE__ ) . '/ndw_js.js', array(), '1.0.0', true);     $scriptdata = array('admin_ajax' => admin_url( 'admin-ajax.php' ));     wp_localize_script( 'ndw_js', 'toremove', $scriptdata); } add_action('admin_init', 'ndw_js_init'); 

Where I am coming unstuck is in the jQuery file. The variable is passed onclick. So far I have this which works fine (tested using an alert()):

$('tr td .widget-remove a').click(function(){      var toremove = $(this).attr('rel');      var url = 'options.php'; // EDIT: Actualy, is this right? Or should the data be passed to the name of my plugin main page I wonder      // Out of ideas }); 

So what I need is help to use the correct AJAX syntax to pass the value of var 'toremove' to 'options.php' and then do something in 'options.php' using the value of 'toremove'.

Hope that makes sense!

EDIT No.1:

OK, so after playing with different settings provided by all of you I have a (semi) functional script:

function ndw_js_init(){     wp_register_script( 'ndw_js', plugin_dir_url( __FILE__ ) . '/ndw_js.js', array( 'jquery' ), '', true );     wp_enqueue_script( 'ndw_js' ); // not working without this     wp_localize_script( 'ndw_js', 'toremove', array('ajaxurl' => admin_url( 'admin-ajax.php' ))); } add_action('admin_init', 'ndw_js_init'); 

Without these settings as they are nothing works. In my external js file I now have:

$('tr td .widget-remove a').click(function(){         var toremove = $(this).attr('rel');         $.ajax({             type: 'POST',              dataType: 'json',             url: ajaxurl,              data: {                 nonce : toremove.nonce,                 toremove : toremove             },             complete: function( data ){                 alert(toremove + " ding!");             }         });     }); 

This works - but only the jQuery code. In the Admin area on my plugin settings page the alert fires on click with the correct id no and the word 'ding!'.

Back to my plugin settings page and I add this (thanks @MMK):

function ndw_ajax_function(){                 $toremove = $_POST['toremove'];     echo "To remove: " . $toremove; }  add_action('wp_ajax_my_ajax_action', 'ndw_ajax_function' ); 

This does not work, I view the generated source and the echoed line does not appear. However, I am not sure in that last add action what wp_ajax_my_ajax_action refers to.


May i suggest:

$('tr td .widget-remove a').click(function(){
    var toremove = $(this).attr('rel');
    // Out of ideas     -     you shouldn't really be for we are here!
        type: 'POST',         // use the method you want
        dataType: 'json',
        url: ajaxurl,        // this is the url to the admin ajax script
        data: {
            nonce : your_script_data_object.nonce,
            toremove: toremove
        complete: function( object ){
            // do what you want here when the ajax requests completes

Now in your plugin somewhere you will have to have a function that intercepts the data that your are sending. You should just make sure you are adding your ajax intercept function to the right action hook in wordpress. Here's how you can do it.

Here is the non-oop way.

add_action('wp_ajax_my_ajax_action', 'my_ajax_function' );

And here the oop way.

add_action('wp_ajax_my_ajax_action', array( $this, 'my_ajax_function' ) );

Here is the function:

function my_ajax_function(){
    // do what you want here - the world is open to you
    $toremove = $_POST['toremove'];
    // Any other thing you want to do
    wp_send_json_success( array( 'AnyDataYouWantToSend' => $your_data ) );

If you encounter any error in my_ajax_function then use wp_send_json_error in place of wp_send_json_success.

I also noted one unusual thing. Why are you using wp_register_script and wp_enqueue_script on the same script. Here is something you can do. Remove the wp_register_script line and let your function look like this:

function ndw_js_init(){
    wp_register_script( 'ndw_js', plugin_dir_url( __FILE__ ) . '/ndw_js.js', array( 'jquery' ), '', true );
    wp_enqueue_script( 'ndw_js' );
    wp_localize_script( 'ndw_js', 'toremove' );
add_action('admin_init', 'ndw_js_init');

You don't need the $scriptdata variable you were using since as i told you the ajaxurl javascript variable already gives you access to the admin ajax url. That is only if you are in the admin. On the frontend make sure your $scriptdata var is present as the parameter for wp_localize_script

You don't need this line too:


This is because you are already telling Wordpress that your script requires jquery in the dependencies array parameter array( 'jquery' ).

Hope that helps.

OK, I got this working like so:

Step One: Main Plugin File

function ndw_js_init(){
    wp_register_script( 'ndw_js', plugin_dir_url( __FILE__ ) . '/ndw_js.js', array( 'jquery' ), '', true );
    wp_enqueue_script( 'ndw_js' );
    wp_localize_script( 'ndw_js', 'removeid', array('ajaxurl' => admin_url( 'admin-ajax.php' )));
add_action('admin_init', 'ndw_js_init');

Step Two: External JS File

$('tr td .widget-remove a').click(function(){
    var toremove = $(this).attr('rel');
        url: removeid.ajaxurl,
            'action' : 'ndw_ajax_function',
            'passiton' : toremove
        success: function( data ){

Step Three: Back in Main Plugin File

function ndw_ajax_function(){
    $toremove = $_REQUEST['passiton'];
    echo $toremove;
add_action('wp_ajax_ndw_ajax_function', 'ndw_ajax_function' );
add_action( 'wp_ajax_nopriv_ndw_ajax_function', 'ndw_ajax_function' );

This works just fine. Thank you for your help, its greatly appreciated.

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