Angular 4: Conditional CSS classes causing issues with transitions

After scouring through stackoverflow, I have yet to find a solution to my current issue. I am utilizing a conditional class on a div that is applied when a boolean variable becomes true. Below is the code snippet in question:

<div [class.modalwindow-show]="modalState" class="modals">

    [...]

</div>

Upon clicking a button, the boolean variable switches to true and the modalwindow-show class is added to the div. However, I have encountered an issue where the CSS transition does not seem to work as expected - the background changes without a smooth transition. The two relevant classes are defined as follows:

.modals{
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    transition: all .30s ease-in-out;
}

.modalwindow-show{
    background: rgba(10,10,10,0.5);
    display: block;
}

If anyone has insights into why the transition may not be working properly, please share your knowledge.

Answer №1

Issue Resolved!

I have rectified the problem by completely removing the use of display: none and display: block, opting instead for visibility: hidden and visibility: visible. This change was necessary as the previous use of display was causing conflicts with the transition effect.

.modals{
    visibility: hidden;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    transition: all .30s ease-in-out;
}

.modalwindow-show{
    visibility: visible;
    background: rgba(10,10,10,0.5);
}

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