I am working on an arbor.js graph. What I want is to send member id query it from php return member tree json to again to jquery script. then print the tree.
here is HTML form

<form action="" method="post" id="blm_get_tree_view_meta_ajax_form" >           
    <?php echo $dropdown_html; ?>
    <input type="hidden" name="action" value="blm_member_tree_response">
    <input type="hidden" name="blm_mem_tree_meta_nonce" value="<?php echo $blm_add_meta_nonce ?>" />
    <input id="<?php echo $this->plugin_name; ?>-treeview_mem_id"  type="hidden" name="<?php echo "blm"; ?>[memid]" value="">
    <p class="submit"><input type="button" name="get_tree" id="get_tree" class="button button-primary" value="GET TREE"></p>

And this is the jquery script


jQuery( document ).ready( function( $ ) {
"use strict";
        var user_id = $('#binary-level-marketting-treeview_mem_id').val();

            url: params.ajaxurl,
            data:{action:'blm_member_tree_response', user_id:user_id},
                if(data.status == 'ok') {
                    (function ($) {
                    var Renderer = function (canvas) {
                                var canvas = $(canvas).get(0);
                                var ctx = canvas.getContext("2d");
                                var particleSystem;
                                var that = {
                                    // arbor.js rendering goes here.
                                    // and renderer
                                    $(document).ready(function () {
                                        var data = {
                                            nodes: data.nodes,
                                            edges: data.edges
                                        var sys = arbor.ParticleSystem(700, 700, 0.5);
                                        sys.parameters({ gravity:true});
                                        sys.renderer = Renderer("#viewport");

php response function as

public function getTreeGraphView() {
    if (isset($_POST['blm_mem_tree_meta_nonce']) && wp_verify_nonce($_POST['blm_mem_tree_meta_nonce'], 'blm_get_tree_view_meta_form_nonce'))
            $data = array();
            $mtree = new MemberTree();
            $nodes_ = $mtree->getNode();
            $edges_ = $mtree->getEdge();
            $parent_ = $mtree->getParent();
            $data['nodes'] = $nodes_;
            $data['edges'] = $edges_;
            echo $data;
            die( '0' );

    } else {
        wp_die(__('Invalid nonce specified', $this->plugin_name) , __('Error', $this->plugin_name) , array(
            'response' => 403,
            'back_link' => 'admin.php?page=' . $this->plugin_name.'-product',


ajax action

$this->loader->add_action( 'admin_ajax_blm_member_tree_response', $plugin_admin, 'getTreeGraphView');

enqueue scripting and localization did as it is.

The process is 99% success but admin-aax.php returns 400 status code. with following response

and also 0 append to output. I pit wpdie() at end of the function

enter image description here

I cant solve the issue anymore. any expert here?

  • You called die twice, first is die( '0' ); and the second is wp_die(); these two functions have a similarity, output the message and terminate the script. You can remove die('0') and keep wp_die(); or you can replace wp_die() with exit; Commented Oct 31, 2021 at 2:41
  • @TommyPradana Thanks for the quick response. I did both ways you explained but the issue remains the same. :( Commented Oct 31, 2021 at 3:10
  • The hook name should be wp_ajax_blm_member_tree_response and wp_ajax_nopriv_blm_member_tree_response for logged out users. Commented Oct 31, 2021 at 4:38
  • @JacobPeattie Thank you for your response. noprive is not used because this is admin dashboard plugin. but I found a solution by your answer. I used hook as 'admin_ajax_blm_member_tree_response' . I change it to 'wp_ajax_nopriv_blm_member_tree_response'. now 400 gone. 403 arrives. this is the error {"nodes":"{1268:{'color':'red', 'shape':'dot', 'alpha':1'}}","edges":"}"}Invalid nonce specified Commented Oct 31, 2021 at 5:12
  • getting into it. The problem is I am not passing the nonce variable in the ajax calling function. add nonce variable --> $.ajax({ type:'POST', url: params.ajaxurl, data:{action:'blm_member_tree_response', user_id:user_id, blm_mem_tree_meta_nonce:<?php echo "'".$blm_add_meta_nonce_tree . "'"; ?> }, And php response function return $data. use json_encode($data). now response output is correnct. ajax code is 200. but not enter success function . need to work still. if any expert there Commented Oct 31, 2021 at 5:29

1 Answer 1


Change your die( '0' ); to exit; and its work for you.

Better way to return json in wordpress is wp_send_json( $data, 200 )

read more here: https://developer.wordpress.org/reference/functions/wp_send_json/

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