CSS briefly displays overridden styles before applying the final styling

Presently, I have implemented a third-party library directive for a UI toggle button. I made some adjustments to the background color and positioning of the toggle button to align with my business requirements. Instead of the default light green for true and light red for false, I opted for a darker green for true and a light grey for false. Additionally, I slightly shifted the toggle button to the left. These modifications are functioning correctly.

However, the primary issue I am facing is that when the page with the toggle button loads, there is a split-second moment where the old style transitions quickly from the default to my updated style. Subsequently, there are no further appearance glitches, only this initial loading issue where elements seem to shift briefly. While not a major problem, I am unable to identify the cause or understand why this occurs. Could it possibly be related to CSS hierarchy?

Key points regarding this matter:

  • To identify the necessary classes to override, I utilized the inspector tool since the directive only utilizes an nz-toggle tag.
  • I have resorted to using !important to override styles. While I acknowledge that this may not be ideal practice, it is consistent across the entire project and has been established as the standard method for overriding styles.

Here is a comparison between one rule in my CSS file and the default styling:

.nz-toggle-wrap.true {
background-color: #089900 !important;
right: -16px !important;
width: 50px !important;
height: 28px !important;
}

vs.

.nz-toggle-wrap.true {background-color: #60bd68;}

Any insights on how to address this issue?

Answer №1

The reason for this issue is due to the loading sequence of your CSS files - the "new" CSS is loading after the "old" CSS. While the intention is to override the old styles with new ones, if the two codes are too far apart from each other in the document hierarchy, you may notice a delay in the changes taking effect.

To resolve this issue, consider moving the new CSS closer to the old CSS in your code structure. The method for accomplishing this will vary depending on the architecture of your project and how it is built.

Alternatively, it's possible that the class "true" is being added only after the page has loaded, triggering the application of the new styles at that point.

Answer №2

If you have downloaded this "third party library" onto your local machine, you may need to make direct changes to the CSS files of the plugin.

When using the plugin you provided a link for, it might be necessary to edit the mentioned file directly in order to avoid the annoying "flicker" effect caused by styles being loaded sequentially:

https://github.com/tannerlinsley/nz-toggle/blob/master/src/nz-toggle.styl

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