Update the CSS appearance? (Redraw page)

I recently ran into a strange issue while working on an app using Cordova (Phonegap). The styling of many elements in the app depends on the class I set on the body element. For example:

.gray .background{
    background: gray;
}
.gray .title{
    color: white;
}

When I add the class "gray" to the body element like this:

document.body.classList.add("gray");

I expect all styles on the page to update accordingly. However, on one particular device I tested, the styles did not change as expected. Even though I verified that the class was added using JavaScript, the styles remained the same. This inconsistency is puzzling as it does not happen consistently.

Is there a way to manually force an update to the styles in this situation?

Answer №1

The solution may not be the most visually appealing, but for certain Android devices, I have resolved similar issues by using a timeout like this:

setTimeout(function () {

    document.body.classList.add("gray");
}, 0);

Although a timeout of "0" usually suffices, in rare cases a delay may be necessary for proper execution.

The code above ensures that all tasks in the execution queue are completed before changing the class. Particularly on slower devices, some changes may not have enough time to render while JavaScript is running (potentially due to a rendering bug in HTML).

It is crucial to also consider that other parts of your code could contribute to this behavior.

If the issue persists, you can force the browser to redraw as described in Force Redraw. If this does not resolve the problem, you can delay the redraw itself using a setTimeout function.

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