Retrieve Element By Class Name in JavaScript

How can I modify the border color at the bottom of the .arrow_box:after?

Javascript Solution

document.getElementsByClassName("arrow_box:after")[0].style.borderBottomColor = "blue";

Despite trying this solution, it seems to be ineffective!

For a closer look at the issue, feel free to visit this example on Fiddle.

Answer №1

JavaScript cannot directly modify the styles of pseudo elements like :after or select them because they are not technically part of the DOM tree.

One workaround is to add another class to the element, as shown below:

document.getElementsByClassName("message_bubble")[0].className = "message_bubble highlighted";

.message_bubble.highlighted:after {
    background-color: yellow;
}

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