Did you know that you can access parameters passed to UI page inside UI page client script directly?

Example:

UI Action to invoke UI page:

var gdw = new GlideModal(‘validate_ui_page’); // name of UI page

gdw.setSize(750,300);

gdw.setPreference(‘sysparm_tableName’, g_form.getTableName());

gdw.render();

UI Page Client Script:

var myModal = GlideModal.prototype.get(‘validate_ui_page’); // pass name of the UI page for global scope and for scoped app pass the endpoint name without .do extension

var tableName = myModal.getPreference(‘sysparm_tableName’); // pass name of the parameter mentioned in setPreference() method