How to Filter Data in AngularJS Using Multiple Values (OR Operation)?

Filtering Multiple Values (OR Operation) in AngularJS

In AngularJS, filtering data is an essential task for displaying tailored content to users. However, when you need to filter data based on multiple criteria, expressing an OR operation can be challenging.

This task requires you to filter an object based on multiple values. Consider an object movie with a genres property, and you want to display movies that belong to either the "Action" or "Comedy" categories.

While using filter:({genres: 'Action'} || {genres: 'Comedy'}) is possible, it becomes cumbersome when you want to filter dynamically based on a variable. Here's how you can approach this issue:

Custom Filter Function

A better solution is to create a custom filter function. Custom filters provide a more organized and maintainable approach. You can define a filter named bygenre in your AngularJS application as follows:

<code class="javascript">angular.module('myFilters', []).filter('bygenre', function() {
  return function(movies, genres) {
    var out = [];
    // Implement filter logic here, adding matches to the out variable.
    return out;
  };
});</code>

Template Usage

Once you have defined the custom filter, you can use it in your template as follows:

<code class="html"><h1 ng-init="movies = [
          {title:'Man on the Moon', genre:'action'},
          {title:'Meet the Robinsons', genre:'family'},
          {title:'Sphere', genre:'action'}
       ];">Movies</h1>
<input type="checkbox" ng-model="genrefilters.action" />Action
<br>
<input type="checkbox" ng-model="genrefilters.family" />Family
<br>
{{genrefilters.action}}::{{genrefilters.family}}
<ul>
    <li ng-repeat="movie in movies | bygenre:genrefilters">{{movie.title}}: {{movie.genre}}</li>
</ul></code>

In the template, you can toggle the genrefilters checkbox to dynamically change the filter criteria. The custom filter will automatically display movies that match any of the selected genres.

Further Exploration

For more information on creating custom AngularJS filters, refer to the official documentation here: [Creating Angular Filters](https://docs.angularjs.org/guide/filter).

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