Media Queries in JavaScript

Media Queries in JavaScript

We all know CSS media queries, which allow us to apply different styles depending on a media rule. Now, learn how to conditionally run JavaScript code depending on a media query.

In short, it’s a simple and fast way to write media queries in JavaScript. The concept is the same as in CSS: if the condition of the media query is matched, then run some code. We can pass any of the CSS @media rules (screen, orientation, min-width, etc.) as a string argument to the method, which returns a MediaQueryList object with two properties and two methods.

Properties:

  • matches : a boolean which is true if the media query is satisfied or false otherwise. This is the basic usage and more intuitive property that you will be using in most cases, and is very similar to how we write CSS media queries.
  • media: the media query itself.

Methods:

  • addListener() or addEventListener() : adds a callback which is called when the media query changes its state.
  • removeListener() or removeEventListener() : removes the specified callback previously defined in the addListener().

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