Can I change the media query using javascript / jQuery?

Question

I have a style.css with a media query. In my javascript-file, I have a value for the desired mobile-width stored in a variable.

By changing the variable, I want to c

Answer 1

The best option would be to have two sets of media queries which are only applied based on a parent class being present.

@media (max-width: 600px) {

  .w600 .myDiv{
    color:red;
  }

}

@media (max-width: 400px) {

  .w400 .myDiv{
    color:red;
  }

}

You could then add/remove w600 or w400 to the body class to allow the required media query to work.

Using jQuery this could be done like:

$("body").addClass("w600")
         .removeClass("w400");

---

I appreciate you may have more than just one style and would therefore like to reduce code duplication.

In which case you could use a CSS transpiler such as Less with mixins:

@mediaqueryruleset:{
  .myDiv{
    color:red;
  }
  .myOtherDiv{
    color:blue;
  }
}

@media (max-width: 600px) {

  .w600 {
    @mediaqueryruleset();
  }

}

@media (max-width: 400px) {

  .w400 {
    @mediaqueryruleset();
  }

}

Which would output:

@media (max-width: 600px) {
  .w600 .myDiv {
    color: red;
  }
  .w600 .myOtherDiv {
    color: blue;
  }
}
@media (max-width: 400px) {
  .w400 .myDiv {
    color: red;
  }
  .w400 .myOtherDiv {
    color: blue;
  }
}