Download Media Javascript

The defined media query will return a MediaQueryList object. It is an object that stores information about the media query and the key property we need is .matches. That is a read-only Boolean property that returns true if the document matches the media query.

To finish the article here is a useful example that is not achievable in the old way. Using a media query I will check if the user is in the landscape mode. This approach is common when developing HTML5 games and is best viewed on a mobile device.

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I am a React developer, but I still think using CSS media queries instead of JS has better performance than waiting for the browser/component to be mounted and getting the viewport width/height after that.

Thanks for an article. On improvement can be added here. Rather using specific method addListener which is marked as deprecated, we can use native Event interface and just set it in this way mediaQuery.addEventListener('change', handleTabletChange).

The window.matchMedia() method returns a MediaQueryList object representing the results of the specified CSS media query string.The value of the matchMedia() method can be any of the media features of the CSS @media rule, like min-height, min-width, orientation, etc.

I have a map that I generate, but am not showing it in the mobile/small screen version forb andwidth reasons. Yet, the javascript still executes in the background even though you can't see it on the mobile screen. So, I'm trying to find a way in javascript where I can do something like:

I've read about people setting CSS properties to specific values in their media queries and then trying to find that element in the DOM based on the CSS property, but there has got to be a better way. Any ideas?

You can detect viewport dimension changes, but you must calculate factors such as orientation and aspect ratios and there is no guarantee our calculation will match our browser assumptions when it applies media query rules.

I'm having some issues trying to add media queries with jQuery/javascript. I have a hidden on small screens with display: none. I want to use the code below to make it show up, although I don't get any errors nothing changes.

A media query is composed of an optional media type and any number of media feature expressions, which may optionally be combined in various ways using logical operators. Media queries are case-insensitive.

A media query computes to true when the media type (if specified) matches the device on which a document is being displayed and all media feature expressions compute as true. Queries involving unknown media types are always false.

Note: A style sheet with a media query attached to its tag will still download even if the query returns false, the download will happen but the priority of downloading will be much lower. Nevertheless, its contents will not apply unless and until the result of the query changes to true. You can read why this happens in Tomayac's blog Why Browser Download Stylesheet with Non-Matching Media Queries.

Many media features are range features, which means they can be prefixed with "min-" or "max-" to express "minimum condition" or "maximum condition" constraints. For example, this CSS will apply styles only if your browser's viewport width is equal to or narrower than 1250px:

If you create a media feature query without specifying a value, the nested styles will be used as long as the feature's value is not zero (or none, in Level 4). For example, this CSS will apply to any device with a color screen:

Sometimes you may want to create a media query that depends on multiple conditions. This is where the logical operators come in: not, and, and only. Furthermore, you can combine multiple media queries into a comma-separated list; this allows you to apply the same styles in different situations.

In the previous example, we've already seen the and operator used to group a media type with a media feature. The and operator can also combine multiple media features into a single media query. The not operator, meanwhile, negates a media query, basically reversing its normal meaning. The only operator prevents older browsers from applying the styles.

The and keyword combines a media feature with a media type or other media features. This example combines two media features to restrict styles to landscape-oriented devices with a width of at least 30 ems:

You can use a comma-separated list to apply styles when the user's device matches any one of various media types, features, or states. For instance, the following rule will apply its styles if the user's device has either a minimum height of 680px or is a screen device in portrait mode:

Taking the above example, if the user had a printer with a page height of 800px, the media statement would return true because the first query would apply. Likewise, if the user were on a smartphone in portrait mode with a viewport height of 480px, the second query would apply and the media statement would still return true.

The not keyword inverts the meaning of an entire media query. It will only negate the specific media query it is applied to. (Thus, it will not apply to every media query in a comma-separated list of media queries.) The not keyword can't be used to negate an individual feature query, only an entire media query. The not is evaluated last in the following query:

The Media Queries Level 4 specification includes some syntax improvements to make media queries using features that have a "range" type, for example width or height, less verbose. Level 4 adds a range context for writing such queries. You can check the @media browser compatibility table for details on support.

\n A media query is composed of an optional media type and any number of media feature expressions, which may optionally be combined in various ways using logical operators.\n Media queries are case-insensitive.\n

\n A media query computes to true when the media type (if specified) matches the device on which a document is being displayed and all media feature expressions compute as true.\n Queries involving unknown media types are always false.\n

\n Note: A style sheet with a media query attached to its tag will still download even if the query returns false, the download will happen but the priority of downloading will be much lower.\n Nevertheless, its contents will not apply unless and until the result of the query changes to true.\n You can read why this happens in Tomayac's blog Why Browser Download Stylesheet with Non-Matching Media Queries.\n

\n Many media features are range features, which means they can be prefixed with \"min-\" or \"max-\" to express \"minimum condition\" or \"maximum condition\" constraints.\n For example, this CSS will apply styles only if your browser's viewport width is equal to or narrower than 1250px:\n

\n If you create a media feature query without specifying a value, the nested styles will be used as long as the feature's value is not zero (or none, in Level 4).\n For example, this CSS will apply to any device with a color screen:\n

\n Sometimes you may want to create a media query that depends on multiple conditions. This is where the logical operators come in: not, and, and only.\n Furthermore, you can combine multiple media queries into a comma-separated list; this allows you to apply the same styles in different situations.\n

\n In the previous example, we've already seen the and operator used to group a media type with a media feature.\n The and operator can also combine multiple media features into a single media query. The not operator, meanwhile, negates a media query, basically reversing its normal meaning.\n The only operator prevents older browsers from applying the styles.\n

\n Note: In most cases, the all media type is used by default when no other type is specified.\n However, if you use the not or only operators, you must explicitly specify a media type.\n

\n The and keyword combines a media feature with a media type or other media features.\n This example combines two media features to restrict styles to landscape-oriented devices with a width of at least 30 ems:\n

\n You can use a comma-separated list to apply styles when the user's device matches any one of various media types, features, or states.\n For instance, the following rule will apply its styles if the user's device has either a minimum height of 680px or is a screen device in portrait mode:\n

\n Taking the above example, if the user had a printer with a page height of 800px, the media statement would return true because the first query would apply.\n Likewise, if the user were on a smartphone in portrait mode with a viewport height of 480px, the second query would apply and the media statement would still return true.\n

\n The not keyword inverts the meaning of an entire media query. It will only negate the specific media query it is applied to.\n (Thus, it will not apply to every media query in a comma-separated list of media queries.)\n The not keyword can't be used to negate an individual feature query, only an entire media query.\n The not is evaluated last in the following query:\n

\n The Media Queries Level 4 specification includes some syntax improvements to make media queries using features that have a \"range\" type, for example width or height, less verbose.\n Level 4 adds a range context for writing such queries.\n You can check the @media browser compatibility table for details on support.\n

The Window interface's matchMedia() method returns a new MediaQueryList object that can then be used to determine if the document matches the media query string, as well as to monitor the document to detect when it matches (or stops matching) that media query.

To perform a one-time, instantaneous check to see if the document matches the media query, look at the value of the matches property, which will be true if the document meets the media query's requirements.

If you need to be kept aware of whether or not the document matches the media query at all times, you can instead watch for the change event to be delivered to the object. There's a good example of this in the article on Window.devicePixelRatio. 2351a5e196