HtmlButton failing to execute client-side validation on IE11

I am encountering a strange problem with a web form using the HTMLButton in an asp.net environment. Due to formatting requirements, I need to utilize a <button> construct which functions properly in all browsers except for IE11.

<button id="cmdLogin" runat="server" OnServerClick="cmdLogin_OnServerClick" class="btn btn-more" ValidationGroup="Login" CausesValidation="True">
    Login
</button>

When I use a standard asp.net button control, the client-side validation executes correctly. The discrepancy I noticed between the buttons is the onclick function that ASP.Net injects:

if (typeof(Page_ClientValidate) == 'function') Page_ClientValidate('ModalLogin'); __doPostBack('ctl00$scriptsFooterPlaceholder$TDF971800010$cmdLogin','')

Although I'm aware of issues related to __doPostBack in IE11 for .Net 4, my application runs on .Net 4.51 so that might not be the cause. There are no visible JavaScript errors affecting the functionality (and the standard button test suggests that client-side script works fine). The problem only occurs in IE11 while other browsers such as Chrome, Firefox, Safari, IE8, IE9, and IE10 work without any hitches.

Has anyone else encountered this issue before?

javascript.netinternet-explorer-11asp.net-4.5

Answer №1

Attempting to intercept the click event in IE11, I decided to manually trigger validation. Surprisingly, a simple piece of code below seemed to address the issue:

<script>
var isIE11 = !!navigator.userAgent.match(/Trident.*rv\:11\./);
if (isIE11) {
    $('.btn').on('click', function (e) {
        e.preventDefault();
    });
}

Using preventDefault surprisingly allowed client side validation to function properly without triggering a postback. Earlier, all forms were being validated on postback, but this "fix" didn't disrupt the client side validation.

Note: Although I typically avoid browser detection, in this case, focusing on IE11's behavior seems necessary for now. A potential bug in IE11 with .Net and the HtmlButton construct might require a patch from Microsoft, and further investigation is warranted after completing the current project.

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