JavaScript CSS: conditionally apply a class [duplicate] conditionally apply class angular,conditionally apply class react,conditionally apply

As far as I know, there is no conditionals if/then/else in css. Alternatively, you can use javascript/jQuery to apply the CSS dynamically. Something like this.

component.classList.add('red');
component.classList.remove('red');
Answer:1

Do both in the same rule:

.red, div[error] {
    color: red;
}

If it's dynamic, you can't do it with pure CSS - there are a variety of other methods though:

JavaScript:

document.querySelectorAll("div[error]").forEach)e => e.classList.add("red"));

jQuery:

$("div[error]").addClass("red");
Answer:2

You can generalize them and define them as needed. Even if they're different .css file as long as they're not conflicting which each other property they would be applied.

.red {
  color: red;
}

div[error] {
  background-color: yellow;
}

div[error=true] {
  color: red;
}

div[error=false] {
  color: blue;
}
<div error>error</div>
<div error="true">true error</div>
<div error="false">fake error</div>
<div class="red">red</div>
Answer:3

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