DirtyForms does not work properly with $.blockUI - jquery-blockui

Question

I'm using DirtyForms and $.blockUI plugin, the latter to change pages when clicking on links (in my app, some pages take a couple of seconds more to load and a visual feedback is fine).
When I change field content and then click any link, DirtyForms is triggered: but when I cancel the process to stay on the page, $.blockUI starts its game, resulting in a stuck page
$('form[method="post"]').dirtyForms();
$('a').on('click', function(){
$.blockUI();
})
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery.dirtyforms/2.0.0/jquery.dirtyforms.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery.blockUI/2.70/jquery.blockUI.min.js"></script>
<p>Change the field content to activate DirtyForms, then click on the link.<br>
When the popup appears, click on "cancel" to stay on the page.<br>
Watch blockUI getting fired as the link is going to be followed</p>
<form action="#" method="post">
<input type="text" name="username" required>
<button type="submit">send</button>
</form>
click me after changing field content
Please, any solution?
EDIT: I also tried with stay.dirtyforms and afterstay.dirtyforms events, but they have no effect. defer.dirtyforms seems to work but the event is triggered twice (I put a console.log() to check) and I am not sure this is the way to go...

Answer 1

I've edit my answer: I've added some line of code to disable first the onbeforeunload dialog alert, taken from here. And at the end a link to an answer with another idea you can try.
My idea: you have to prevent the default link action and use the $.blockUI Modal Dialogs methods to open a custom dialog, then catch the link attribute href from the link put it inside a variable and use the variable value for the #yes button of the dialog.
See if this solution can meet your needs
/* beforeunload bind and unbind taken from https://gist.github.com/woss/3c2296d9e67e9b91292d */
// call this to restore 'onbeforeunload'
var windowReloadBind = function(message) {
window.onbeforeunload = function(event) {
if (message.length === 0) {
message = '';
};
if (typeof event == 'undefined') {
event = window.event;
};
if (event) {
event.returnValue = message;
};
return message;
}
};
// call this to prevent 'onbeforeunload' dialog
var windowReloadUnBind = function() {
window.onbeforeunload = function() {
return null;
};
};
var linkToFollow; // href to follow
$('form[method="post"]').dirtyForms();
$('a').on('click', function(e){
e.preventDefault();
windowReloadUnBind(); // prevent dialog
$.blockUI({ message: $('#question'), css: { width: '275px' } });
linkToFollow = $(this).attr('href');
});
$('#no').click(function() {
$.unblockUI();
return false;
});
$('#yes').click(function() {
$(window.location).attr('href', linkToFollow);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery.dirtyforms/2.0.0/jquery.dirtyforms.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery.blockUI/2.70/jquery.blockUI.min.js"></script>
<p>Change the field content to activate DirtyForms, then click on the link.<br>
When the popup appears, click on "cancel" to stay on the page.<br>
Watch blockUI getting fired as the link is going to be followed</p>
<form action="#" method="post">
<input type="text" name="username" required>
<button type="submit">send</button>
</form>
click me after changing field content
<div id="question" style="display:none; cursor: default">
<h6>Would you like to contine?.</h6>
<input type="button" id="yes" value="Yes" />
<input type="button" id="no" value="No" />
</div>
Other idea taken from another answer: Other idea would be to make a simple jQuery.ajax({}) call before return value in beforeunload as seen in this answer