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Angular matchMedia Module

Provides an Angular service that returns true if the current screen width matches or false if not. Uses the screen widths predefined in Twitter Bootstrap 3 or a customized size you define. There is a staic method is which checks for a match on page load and a dynamic method on which checks for a match and updates the value on window resize.

Installation

Download the component via bower:

bower install --save angular-media-queries

Include AngularJS on the page and then include this script. If possible, include these scripts in the footer of your site before the closing </body> tag.

<script type='text/javascript' src='/static/path/to/angular.min.js'></script>
<script type='text/javascript' src='/static/path/to/angular-media-queries/match-media.js'></script>

Usage

Require the matchMedia module as a dependency in your app:

angular.module('myApp', ['matchMedia'])

In a Controller

Is

Use the service's is method to determine if the screensize matches the given string/array.

angular.module('myApp', ['matchMedia'])
.controller('mainController', ['screenSize', function (screenSize) {
  var data = complicatedChartData;

  //Determine to either perform cpu/network-intensive actions(desktop) or retrieve a small static image(mobile). 
  if (screenSize.is('xs, sm')) {
    // it's a mobile device so fetch a small image
    $http.post('/imageGenerator', data)
    .success(function (response) {
      document.querySelector('.chart').src = response.chartUrl;
    });
  }
  else {
    // it's a desktop size so do the complicated calculations and render that
    document.querySelector('.chart')
    .appendCanvas()
    .parseData()
    .renderCrazyChart();
  }
}]);

On

The callback fed to .on will execute on every window resize and takes the truthiness of the media query as its first argument. Be careful using this method as resize events fire often and can bog down your application if not handled properly.

  • Executes the callback function on window resize with the match truthiness as the first argument.
  • Returns the current match truthiness.
  • Passing $scope as a third parameter is optional, when not passed it will use $rootScope
angular.module('myApp', ['matchMedia'])
.controller('mainController', ['screenSize', function (screenSize) {
  $scope.isMobile = screenSize.on('xs, sm', function(isMatch){
    $scope.isMobile = isMatch;
  });
}]);

When

If you only want the callback to fire while in the correct screensize, use the when method. Be careful using this method as resize events fire often and can bog down your application if not handled properly.

angular.module('myApp', ['matchMedia'])
.controller('mainController', ['screenSize', function (screenSize) {

    // Will fire as long as the screen is size between 768px and 991px
    screenSize.when('sm', function() {
        console.log('Your screen size at the moment is between 768px and 991px.');
    });
}]);

OnChange

The callback fed to .onChange will execute on every window resize and takes the truthiness of the media query as its first argument. Be careful using this method as resize events fire often and can bog down your application if not handled properly.

  • Executes the callback function ONLY when the match differs from previous match.
  • Returns the current match truthiness.
  • The 'scope' parameter is required for cleanup reasons (destroy event).
angular.module('myApp', ['matchMedia'])
.controller('mainController', ['screenSize', function (screenSize) {
  $scope.isMobile = screenSize.onChange('xs, sm', function(isMatch){
    $scope.isMobile = isMatch;
  });
}]);

isRetina

This will return a boolean to indicate if the current screen is hi-def/retina.

angular.module('myApp', ['matchMedia'])
.controller('mainController', ['screenSize', function (screenSize) {
  $scope.isRetina = screenSize.isRetina;
}]);

Filter

Operate on string values with the filter: Have the placeholder sign % replaced by the actual media query rule name.

Example:

    <div> {{'Your screen size is: ' | media }} "</div>

Example with replace:

    <div ng-include="'/views/_partials/_team_%.html' | media:{ replace: '%' }"></div>

Extended example:

    <div ng-include="'/views/_partials/_team_%.html' | media:{ replace: '%', groups: { mobile:['ti','xs','sm'], desktop:['md','lg'] } }"></div>

ngIf Example

In your controller you can create variables that correspond to screen sizes. For example add the following to your controller:

// Using static method `is`
angular.module('myApp', ['matchMedia'])
.controller('mainController', ['screenSize', function (screenSize) {
  $scope.desktop = screenSize.is('md, lg');
  $scope.mobile = screenSize.is('xs, sm');
}]);

// Using dynamic method `on`, which will set the variables initially and then update the variable on window resize
$scope.desktop = screenSize.on('md, lg', function(match){
    $scope.desktop = match;
});
$scope.mobile = screenSize.on('xs, sm', function(match){
    $scope.mobile = match;
});

Then in your HTML you can show or hide content using ngIf or similar directives that take an Angular expression:

<img ng-if='desktop' ng-src='http://example.com/path/to/giant/image.jpg'>

This particular example is great for only loading large, unnecessary images on desktop computers.

Note: It's important if you plan on using screensize.is() in directives to assign its return value to a scoped variable. If you don't, it will only be evaluated once and will not update if the window is resized or if a mobile device is turned sideways.

Custom Screen Sizes or Media Queries

You can access and therefore customize the media queries or create your own:

angular.module('myApp', ['matchMedia'])
.controller('mainController', ['screenSize', function (screenSize) {
  screenSize.rules = {
    retina: 'only screen and (min-device-pixel-ratio: 2), only screen and (min-resolution: 192dpi), only screen and (min-resolution: 2dppx)',
    superJumbo: '(min-width: 2000px)',

  };

  if (screenSize.is('retina')) {
    // switch out regular images for hi-dpi ones
  }

  if (screenSize.is('superJumbo')) {
    // do something for enormous screens
  }
}]);

License

This work is licensed under the Creative Commons Attribution-ShareAlike 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by-sa/4.0/deed.en_US.

Contributors

Todo

  • Write tests.
  • Add a simple directive wrapper for ng-if.
  • Add Grunt tasks.