Changing on keyup to click event not triggering action

I am trying to add a click event on a function, but for some reason nothing is happening, no errors in the console and action is not triggered. This is the plugin that I am altering: http://ift.tt/1G2m5V3 and on line 102 - 106

window.onload = function() {
    tinymce.get('bbp_<?php echo $type; ?>_content').on('keyup', function(e) {
        bbp_preview_post(this.getContent(), '<?php echo $type; ?>', true);
    });
}

this is the function that is triggering the event on keyup

I tried

HTML

<button type="button" id="bbp_topic_preview" class="button submit">Preview Topic</button>

Jquery - V1

window.onload = function() {
    tinymce.get('bbp_<?php echo $type; ?>_content').on('click', '#bbp_topic_preview', function(e) {
        bbp_preview_post(this.getContent(), '<?php echo $type; ?>', true);
    });
}

Jquery - V2

window.onload = function () {
    jQuery('#bbp_topic_preview').on('click', function() {
        tinymce.get('bbp_<?php echo $type; ?>_content').on('ready', function(e){
            bbp_preview_post( this.getContent(), '<?php echo $type; ?>', true );
        });
    });
}

But nothing is happening and no errors echoed in the console.