The CSS attribute selector is unable to target dynamically appended class names

Utilizing React's CSS animations add-on has been a seamless process, with everything running smoothly when using the provided classnames.

.quote-enter {
  opacity: 0.01;
  transition: opacity .25s ease-in;
}

.quote-enter.quote-enter-active {
  opacity: 1;
}

.quote-leave {
  opacity: 1;
  transition: opacity .25s ease-in;
}

.quote-leave.quote-leave-active {
  opacity: 0.01;
}

However, I encountered an issue when attempting to convert this into an attribute selector method to target each instance of the component for animation - it seems that no selectors match.

[class$='-enter'] {
  opacity: 0.01;
  transition: opacity .25s ease-in;
}

[class$='-enter'][class$='-enter-active'] {
  opacity: 1;
}

[class$='-leave'] {
  opacity: 1;
  transition: opacity .25s ease-in;
}

[class$='-leave'][class$='-leave-active'] {
  opacity: 0.01;
}
csscss-selectors

Answer №1

When using the $= operator, it specifically targets the end of an attribute. Therefore, if the class you're trying to select is not the last one within an element (such as 

class="whatever-enter other-class"
), the selector will not match.

To work around this issue, consider using the following approach:

[class$='-enter'], [class*='-enter '] {
  opacity: 0.01;
  transition: opacity .25s ease-in;
}
[class$='-leave'], [class*='-leave '] {
  opacity: 1;
  transition: opacity .25s ease-in;
}

If dealing with combinations of two classes, creating selectors can become more complex (2*2 = 4 selectors). In such cases, sticking to using the *= operator alone might be a better option:

[class*='-enter'] {
  opacity: 0.01;
  transition: opacity .25s ease-in;
}

[class*='-enter'][class*='-enter-active'] {
  opacity: 1;
}

[class*='-leave'] {
  opacity: 1;
  transition: opacity .25s ease-in;
}

[class*='-leave'][class*='-leave-active'] {
  opacity: 0.01;
}

This method will effectively work unless there are other classes that end with the specified suffixes.

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