odoo.define('web_editor_pagebreak.pdf_preview.js', function (require) {
"use strict";

    var form_widget = require('web.form_widgets');
    var core = require('web.core');
    var _t = core._t;
    var QWeb = core.qweb;
    var pdfjsLib = require('web.pdf_js_lib');
    /*
    output in console:

pdf viewer
boot.js:185 warning: Some modules could not be started
boot.js:187 Missing dependencies:     ["web.pdf_js_lib"]
boot.js:199 Non loaded modules:       ["web_editor_pagebreak.pdf_preview.js"]
boot.js:202 Debug:                    {web_editor_pagebreak.pdf_preview.js: {…}}

    */

    form_widget.WidgetButton.include({
        on_click: function() {
            if(this.node.attrs.custom === "click"){
                // YOUR CODE
                return;
            }
            this._super();
        },
    });
});