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How can I list the available filters

I have a scenario where I want the user to be able to choose which filter to apply. I do not want to contain a separate filter list in html. Therefore, consider the following code, where I am trying to access the names of registered filters. (I'm new to AngularJS, so sorry if this is obvious)

angular.module('app.filters', []);

angular.module('app.filters').filter('filter1', function() {/* filter code */});

angular.module('app.filters').filter('filter2', function() {/* another filter code */});

angular.module('app', ['app.filters']);

angular.module('app').controller('MainCtrl', function ($scope, $filter) {

    /* How do I list filter1 and filter2 in here so that they can be output
       in a template? The below means the filter names are recorded twice */

    $scope.availableFilters = ['filter1', 'filter2']
});
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1 answer

I think there is no way to do this. But you can get this information if you connect to $filterProvider:

.config(function($filterProvider, $provide) {
    // keep the original register fucntion
    var registerFn = $filterProvider.register;
    // array with all filters
    var allFilters = [];

    // replace the register function with our own implementation
    $filterProvider.register = function(name, fn){
        // save the name in the array
        allFilters.push(name);
        // call the original function
        registerFn(name, fn);
    }

    // register a value to retrieve the filters
    $provide.value('filters', allFilters);

})

The value filterscan now be used in your controller by entering it:

.controller('MainCtrl', function(filters){
   // outputs an array with all known filters
   console.log(filters);
})
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