Changing links with Javascript or PHP

Question

I have a problem with a button where I need to change its link with javascript or php.

Come on!

My platform generates an automatic form, but I don’t have access to the source code. The form collects name and email and sends to the platform, for this reason the form is already ready. However when collecting the data, continues on the same page, I need to redirect to another page to the user click the button and the button also continue with the functionality of registering the data on the platform, however I do not have the source code as said above.

I can see the id’s, class, name and everything else by "inspecting" the browser, I wonder if there is any way to redirect the page with js or php knowing that I know the attributes above.

<div class="pages">
   <cxc.newsletter/>
</div>

This div is to call the platform form already ready. When it is displayed in the browser, it shows the form with the fields to fill in, and these fields have their id, name, class that I also use to style inputs and button.

Answer 1

Create a addEventListener to the button, and when it is clicked, it will start a setInterval that will be checking if the id of div confirmation exists on the page. When it exists, it will redirect to the page on location.href:

<script>
window.onload = function(){
    document.getElementsByClassName("dados")[0].addEventListener("click", function(){
        temporizador = setInterval(function(){
            if(document.getElementById("id_da_div_de_confirmação")){
                clearInterval(temporizador);
                location.href = "página_para_aonde_quer_ir.html";
            }
        }, 10);
    });
}
</script>