Topic: Modal is causing flicker of content in the Accordion

Mayerkel priority asked 2 years ago

I am experiencing very odd behavior when I am using the Accordion with the Modal. What happens is that even if I have the Modal being triggered and rendered by an unrelated button, when I open an Accordion Item, the Accordion item's content will flash briefly (1 frame) before doing the un-collapse animation.

I really want to be able to use the Modal, but even when I simply do <MDBModal /> with nothing in it, the weird Accordion behavior happens. The two components should have nothing to do with one another.

I even went as far as putting <MDBModal /> in my Navbar to see if the issue persists, and it does.

However, once I remove the Modal completely, the Accordion works seamlessly.

Once the AccordionItem is clicked. Notice how the AccordionItem's background is not expanded at all. You can view this expansion in the 3rd image.Once the AccordionItem is clicked

Frame Immediately afterFrame Immediately after

Once Accordion item is expandedOnce Accordion item is expanded

The Modal should not affect the Accordion at all. It seems that wherever the Modal is placed, it causes the Accordion to exhibit this behavior.

This behavior happens every time the Accordion is populated with items and a Modal Component is being used. I tried clearing out the AccordionItem and simply placing text in it. However, the issue persists.

Help with this would be extremely appreciated as I do not want to have to try to make my own Modal or use an external library's Modal. Thank you.


I found that the following code will exhibit the same results:

           <MDBAccordion initialActive={0}>
            <MDBAccordionItem collapseId={0}>
            <MDBAccordionItem collapseId={1}>
            <MDBAccordionItem collapseId={2}>
            <MDBAccordionItem collapseId={3}>
            <MDBAccordionItem collapseId={4}>

It turns out that it doesn't matter what is in the Accordion or the Modal. If they are both being rendered on the page, the Accordion will glitch.

drimaco free answered 2 years ago

The problem is still not fixed in version 4.0.0. Or is "MDBCollapse refactor" not meant by this?Additionally the problem occurred that a select body in an accordion has a wrong width.

enter image description here

Wojciech Staniszewski staff commented 2 years ago

I will add this to our task list. We will check it again.

drimaco free commented 2 years ago

Its much better now. But still appears on smartphones and x4 slowed CPU. Worst experience with some checkboxes in an accordion.

Wojciech Staniszewski staff commented 2 years ago

Unfortunately, some things we can't get around. Due to the rendering, we cannot replicate some animations from MDB Standard (they might work a bit slower/different).

Mayerkel priority answered 2 years ago

On the off-chance there was any confusion on how I can reproduce this every time, it can be reproduced by going to the snippet:

Then, changing the throttling up top to Low-end mobile.

Accordion Issue

Wojciech Staniszewski staff commented 2 years ago

Yes, I did exactly the same thing :)

Mayerkel priority commented 2 years ago

Interesting. I have been able to recreate this behavior on Chrome / Firefox / Edge and also on 3 different devices including a mobile device.

I am unsure of why you are unable to reproduce the issue.

Not do discredit you by any means, but perhaps see if one of your teammates experiences this behavior. It is possible a different device/environment may help?

Many Thanks.

Wojciech Staniszewski staff commented 2 years ago

Some of my team already checked this and did not notice any weird behavior. Tomorrow I will ask another 2 teammates :)

Mayerkel priority commented 2 years ago

I got around to deploying the site to Azure so that maybe you could experience this. Login: Password: test1234

Once logged in, go to the Transactions page by clicking it on the NavBar.

Once here, expand/collapse the last entry in the list.

Thank you again for the assistance.

Wojciech Staniszewski staff commented 2 years ago

Thank you, for this deployment. Probably, there is some bug with the collapse component. We will take a closer look soon.

drimaco free commented 2 years ago

I noticed today that the stepper behaves the same way. It shows the next step for a fraction of a second before it disappears again and then changes to that step with the animation.

Mayerkel priority commented 2 years ago

@Wojciech Staniszewski - I am unsure if you were able to take a look into this yet. I have another deployment if this in a separate Azure AppService:

The issue is still persisting in the accordion. You can use the same login info / steps to get there as I previously listed.

Thank you, Kelden

Wojciech Staniszewski staff commented 2 years ago

Yes, I have already seen this error. We will try to fix it soon.

Mayerkel priority commented 2 years ago

Thank you very much :) I appreciate the help.

drimaco free answered 2 years ago

I have the same issue so i created a repo too. I hope u can use that to fix that. It looks like MDBCollapse will behave similarly.

Wojciech Staniszewski staff commented 2 years ago

Thank you! We will take a look at this issue now

Unfortunately, I could not recreate this problem even by copying your code. Please create a snippet or upload your code to the GitHub repository. Are you sure you do not have any custom styles to interrupt this example?

Mayerkel priority commented 2 years ago

Here is where the Modal is added:

The component that holds the Modal is called here:

I also tried putting that code snipped I provided above here before the MDBContainer to reproduce the effects. That way, I can rule out any JSX code from the larger files I have.

Please let me know if you need anything else. I am relatively new to React development, so if this is an issue on my part, I will happily make any changes needed.

Thank you

Wojciech Staniszewski staff commented 2 years ago

Unfortunately, I don't know how to run your project locally. And I cant debug it without it. Please check here: Create a snippet, set react version to 2.0.0, and recreate your problem. Then save your snippet and paste the link here, so I can check it :D

Mayerkel priority commented 2 years ago


When trying to make a Snippet, I am simply trying to paste the basic Accordion as coded in the example page. However, the opening/closing is not working in that tool. Can you please check to see if you can get the basic Accordion working in the Snippet tool on your end?

Here is just a Snippet with the Accordion example:

Wojciech Staniszewski staff commented 2 years ago

Please edit this snippet:

something must have broken with the one you sent

Mayerkel priority commented 2 years ago

Hello Wojciech,

I found how to reproduce this issue.

Using the snippet you sent me, using Google Chrome, press F12 to open the debugger. From there, click on the Mobile debugging icon. Finally, set the throttling to Mid/Low end mobile.

Once the Accordion is expanded/collapsed, the issue should present itself each time.

Also, it seems that the Modal may not be related to this. In my personal project, the Modal is what causes it to flicker. However, that could be due to the speed of the compiler. The Modal may slow it down just enough for the flickering to happen. In the snippet, I could reproduce the issue without adding the Modal.

Please let me know if you are able to reproduce it.

Thank you!

Wojciech Staniszewski staff commented 2 years ago

I still could not reproduce this problem. I also used the prepared snippet and did everything you told me, but I did not notice any problems. Could you create another snippet or repository, where I could experience this bug?

Mayerkel priority commented 2 years ago

I apologize for the difficulty of reproducing this issue. I am a little unsure of other methods of reproducing.

I tried to run the same snippet in the Edge browser as well. With no throttling, it works perfectly. However, when I set it to Low End Mobile, when I expand/collapse the accordion item, it does the 1ms flicker before expanding.

Try expanding/collapsing/expanding/collapsing a few times. Maybe look into how the draw call is being handled. I am suspecting that the contents of the accordion item are being loaded, but the hiding of the content is happening 1ms too late, causing the flicker.

It seems the issue may be caused as well from the speed of the device being used. Perhaps your computer is too fast to be able to experience the issue? Even if that were so, setting a manual throttle limit in Chrome should let you view the bug.

I am hoping you are able to see what drimaco and I are seeing, as this is a huge inconvenience as it makes the "smooth" aspect of the accordion look glitchy.

Edit: It seems it happens for Accordion Items 2+. Accordion Item 1 does not exhibit the behavior.

Edit #2: I read that throttling in the browser is relative to your current CPU speed. Your PC may be too fast even on the lowest setting. Also, I loaded the snippet on my Galaxy Note9 phone, and I was able to experience the issue without any throttling enabled. (the device isn't the fastest). Maybe try loading up the snippet on a low-end device.

Many Thanks

Wojciech Staniszewski staff commented 2 years ago

I will add this task to our bug list. I will also try to involve more people, maybe they will get this error. For now, this is the only thing I can do

Mayerkel priority commented 2 years ago

Thank you for adding this to the list. Although we have not reached a resolution, your support is greatly appreciated.

It is unfortunate for the behavior as it is a visually unappealing bug.

I know that you will need to reproduce this yourself, but would me recording a video of it happening be of any assistance? I can do that if it may help.

Thank you

Please insert min. 20 characters.


Hire our experts to build a dedicated project. We'll analyze your business requirements, for free.



Specification of the issue

  • ForumUser: Priority
  • Premium support: Yes
  • Technology: MDB React
  • MDB Version: MDB5 3.0.0
  • Device: PC
  • Browser: Chrome
  • OS: Windows 10
  • Provided sample code: Yes
  • Provided link: No