How to change the pop html on button click - google-chrome-extension

Question

I am trying to find a way to change the pop up HTML on a chrome extension to another one when you click a button. I have tried to make a onclick function href but nothing works. I am new to both HTML and chrome extensions so I am sorry if this problem seems easy to the more experience developers.
<form id="gform" method="POST" class="pure-form pure-form-stacked" data-email="from_email#example.com"
action="https://script.google.com/a/cvsd356.org/macros/s/AKfycbxb4ZyUUQCnTN-7iYF-YRViDSy/exec">
<div class="name">
name: <input type="text" name="Name" id= "inputbox"><br>
</div>
<div class="id">
ID# <input type="text" name= "ID" id= "inputbox"><br>
</div>
<div class="MailingAddress">
Mailing Address: <input type="text" name= "Mailing Adresss" id= "inputbox" style=width:350px;><br>
</div>
<div class="sendToTr">
Send Transcript to: <input type ="text" name="College" style=width:350px; id= "inputbox" ><br>
</div>
<div class="emailmy">
<label for="email"><em>Your</em> Email Address:</label>
<input id="inputbox" name="email" type="email" value=""
required placeholder="your.name#email.com" />
</div>
<div class="sButton">
<button style=height:30px;width:70px;border-radius: 3px; class="button-success pure-button button-xlarge">
send
</button>
</div>

Answer 1

I think there are quite a few ways to achieve what you are asking. If I were you, I would add a JavaScript file to my project to do this.
Step 1:
I would tell my HTML page where to find this JS file. The sample below can be included near the end of your HTML file, right before </body></html>. The sample below assumes your new popup.js file is in the root folder of your project:
<script src="popup.js" type="text/javascript"></script>
Step 2:
In the popup.js file, I would create a function that tells the popup how it should be modified. In the sample below, I'm going to hide the element with an ID of "theOldElement" and show the element with an ID of "theNewElement". I'm also going to attach this function to the click event of "theButton" element.
popup.js
function updatePopup(){
document.getElementById("theNewElement").style.display = "block";
document.getElementById("theOldElement").style.display = "none";
}
document.getElementById('theButton').addEventListener('click', updatePopup);
Step 3:
I like referring to my HTML elements by ID (as I've been doing above - note the "getElementById" references), so I would:
add id="theNewElement" to the element I want to reveal
add id="theOldElement" to the element I want to hide
add id="theButton" to the button that I want to trigger this change
Note: you can insert these IDs as the first attribute within the tag you want to identify. E.g., <div id="theNewElement" ...