renemailloux

First, you need to add these code to function.php

/* Describe what the code snippet does so you can remember later on */
add_action('wp_head', 'enable_tiny_mce_wiris');

function enable_tiny_mce_wiris()
{
?>
  <script src="<?php echo get_option('home'); ?>/wp-includes/js/tinymce/plugins/tiny_mce_wiris/integration/WIRISplugins.js?viewer=image" type="text / javascript"> </script>
<?php
};

?>

Then add this line in PHP for the quizz page. I use shortcode for my part.

wp_enqueue_editor();

Finaly add js to initialize the editor.

/* This is your custom Javascript */

(function ($) {
    $(window).load(function () {
        wp.editor.getDefaultSettings;
        var settings = {
            tinymce: {
                selector: 'textarea',
                plugins: 'tiny_mce_wiris',
                toolbar1: 'bold,italic,strikethrough,bullist,numlist,blockquote,hr,alignleft,aligncenter,alignright,image,wp_more,tiny_mce_wiris_formulaEditor,fullscreen,',
                setup: function (editor) {
                    editor.on('change', function () {
                        editor.save();
                    });
                },
            },
        };
        $("textarea.wpProQuiz_questionEssay").each(function (index, element) {
            wp.editor.initialize($(element).attr("id"), settings);
        });         
    });

})(jQuery);

Best regards