Delving Into the Mysteries of Bootstrap Modal Fading

After updating our Bootstrap plugins file to version 2.2.1, I encountered an issue with adding the 'fade' class to modals. Previously, we had been using data-* api references for modals but decided to switch over. However, when I tried to incorporate the 'fade' class for animations, it caused the modal to break - displaying the backdrop but not showing the modal itself. Additionally, the 'trigger' event handler stopped working.

I have created a fiddle demonstrating the problem here. The issue persists across browsers, indicating that the error likely lies on my end. Removing the 'fade' class resolves the issue, but its addition breaks the functionality.

The styles appear to be correct, and the markup follows standard practices. We updated the minified plugin source not long ago, so I am puzzled by this unexpected behavior.

If anyone can offer guidance before I delve further into debugging, I would greatly appreciate it. Hopefully, it is just a minor oversight causing this complication :)

javascripttwitter-bootstrap

Answer №1

Now it is resolved. The mistake was mine, I had overlooked the necessary 'component animations' CSS that needed to be added.

It took some time for me to debug and figure out the issue. Eventually, I realized that the backdrop method callback was not being executed in this piece of code 

doAnimate ?
            this.$backdrop.one($.support.transition.end, callback) :
            callback()
.

In hindsight, it is clear why the callback never ran - there were missing CSS classes preventing transitions from being applied, resulting in no transition end event to trigger. This meant that only the backdrop element received the in class, while the modal itself did not, causing the callback to never reach completion. This was also why the 'trigger' appeared to stop functioning - a large backdrop was present but with an opacity of 0.

Looking back, it all seems quite silly now :)

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