How to get current URL and url param and add onto it

Hi,

I have a browser goto set to go to a url and a url parameter. The page already has a url parameter and I want to add to the url this new param (‘av’).

I tied GET but can’t get it to work.

<input class="form-check-input" type="checkbox" id="input_toggle_av" name="input_toggle_av" value="av=1" dmx-bind:checked="(query.av == 1)" dmx-on:changed="checked ? browser1.goto('NEEDS-TO-BE-EXISTING-URL-AND-PARAMETER?av=1') : browser1.goto('EXISTING-URL-AND-PARAMETER')">