Issues with displaying a login modal on ASP.NET Web Forms

Currently, I am enrolled in an ASP.NET Web Forms course at my school and I have been working on incorporating a login modal into my project.

While following a tutorial from W3Schools on implementing a login form (tutorial), everything was going smoothly. However, when I replaced the standard HTML inputs with ASP inputs (such as changing from HTML input textbox to asp.net textbox) and removed the "required" parameters, I encountered an issue where the modal would close within milliseconds of opening it.

After conducting some testing, I found that this issue only arose when the HTML portion of the modal was situated within the 

<form runat="server">
section.

It is important to note that I am aware of the limitation that forms cannot be nested in an ASP.NET web forms form. Consequently, I made adjustments such as:

 <form class="modal-content animate" action="/action_page.php">

changed to

 <div class="modal-content animate">

Therefore, my query is - why is this occurring and what steps can I take to resolve this issue? Any assistance would be greatly appreciated.

htmlcssasp.netwebforms

Answer №1

The issue was with the button that was triggering a postback, leading to unexpected behavior.
To fix this, I had to modify 

<button onclick="document.getElementById('id01').style.display='block'" style="width:auto;">Login</button>
to 
<button onclick="document.getElementById('id01').style.display='block';return false;" style="width:auto;">Login</button>
in order to prevent the postback

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