Change onclick action with a Javascript function

Question

I have a button:

Button A

When I click this button the first time, I want it to exe

Answer 1

For anyone, like me, trying to set a query string on the action and wondering why it's not working-

You cannot set a query string for a GET form submission, but I have found you can for a POST.

For a GET submission you must set the values in hidden inputs e.g.

an action of: "/handleformsubmission?foo=bar" would have be added as the hidden field like:

This can be done add dynamically in JavaScript as (where clickedButton is the submitted button that was clicked:

var form = clickedButton.form;
var hidden = document.createElement("input");
hidden.setAttribute("type", "hidden");
hidden.setAttribute("name", "foo");
hidden.setAttribute("value", "bar");
form.appendChild(hidden);

See this question for more info submitting a GET form with query string params and hidden params disappear