What is the best way to revert CSS modifications when leaving a component?

I have taught myself most of what I know and I realize there may be better practices out there that could help me. Right now, I am using jQuery to adjust an element's opacity when the mouse hovers over it. However, I am struggling with making sure that the opacity resets back to 0 whenever I navigate away from the component and then return.

I attempted to reset the opacity in ngOnDestroy by directly manipulating the elements using document.getElementsById(), but I understand this might not be the best approach.

I also looked into resetting the CSS properties with jQuery, but I am unsure how to go about it.

The jQuery code is located within a script tag in my index.html file:

$('.parent').mouseover(function() {
          $('.children').animate(
            {
              opacity: 1.0
            },
            1250,
            function() {}
          )
        })

When I come back to the page and the component renders again, I expect '.children' to have an opacity of 0, but they remain visible.

Is there an easy fix for this issue? Or perhaps a more efficient way to achieve what I am trying to accomplish? I also have other jQuery code in my index.html used for various Materialize CSS purposes. If there is a more effective approach, I would appreciate any guidance.

Answer №1

Is there a reason for using jQuery alongside angular7? It seems like there should be a better way to achieve the same result without the need for jQuery.

One alternative approach is to utilize variables in your TypeScript file and control their visibility through different lifecycle hooks.

For example:

private childrenVisible = false;

...

ngOnInit() {
    this.childrenVisible = true
}

...

ngOnDestroy() {
    this.childrenVisible = false
}

Then in your HTML template, you can incorporate the following code into your child items

[ngClass]={'is-active':childrenVisible}

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