How to Dynamically Set AngularJS Filter (like date or currency) Using Variables

Question

How to Dynamically Set AngularJS Filter (like date or currency) Using Variables

When working with Angular, it's possible to easily apply filters to format variables, like so:

{{ myDate | date }}
{{ myMoney | currency }}

But, is there a way to dynamically set the filter type in a more flexible manner as shown below?

// controller 
$scope.myFilter = 'date';

// view
{{ myVar | myFilter }}

Situation: I am retrieving tabular data from my server along with metadata. I aim to display information such as dates, money, or numbers without manually specifying the columns.

For a simple illustration of this issue, check out this non-functional Plunker demo: http://plnkr.co/edit/SjYLKKUZcTjzRFhbsjK0

javascript angularjs

Answer 1

Answer №1

An alternative approach would be to consolidate your filters within a 'table cell filter' or a similar structure, where you can toggle different filters based on a designated parameter that can be controlled programmatically.

Here is an example for reference:

http://plnkr.co/edit/1DGOC1gFZiFyGAQRCIhk?p=preview

Incorporating this into your template:

  <ul>
    <li ng-repeat="value in values">{{value | myfilter:myFilterType }}</li>
  </ul>

The custom filter function:

app.filter('myfilter', function() {
    return function(input, type) {
    switch(type) {
        case 'uppercase':
          return input.toUpperCase();
        case 'lowercase':
          return input.toLowerCase();
        case 'date':
          return input.toString('dddd, MMMM ,yyyy');
        }  
    };
});

If necessary, additional filters can be loaded and implemented within this main filter function to maintain code cleanliness and avoid repetition.

Answer 2

An alternative approach would be to consolidate your filters within a 'table cell filter' or a similar structure, where you can toggle different filters based on a designated parameter that can be controlled programmatically.

Here is an example for reference:

http://plnkr.co/edit/1DGOC1gFZiFyGAQRCIhk?p=preview

Incorporating this into your template:

  <ul>
    <li ng-repeat="value in values">{{value | myfilter:myFilterType }}</li>
  </ul>

The custom filter function:

app.filter('myfilter', function() {
    return function(input, type) {
    switch(type) {
        case 'uppercase':
          return input.toUpperCase();
        case 'lowercase':
          return input.toLowerCase();
        case 'date':
          return input.toString('dddd, MMMM ,yyyy');
        }  
    };
});

If necessary, additional filters can be loaded and implemented within this main filter function to maintain code cleanliness and avoid repetition.

Answer 3

Answer №2

One can implement filters programmatically, although achieving it that way may not be feasible. If you are comfortable with specifying filtered values within the controller, you could approach it similar to this:

JavaScript:

var app = angular.module('angularjs-starter', []);

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

  $scope.values = [new Date(-1), new Date()];

  $scope.myFilter = 'date';

  $scope.$watch('values', function(values){
    $scope.filteredValues = [];
    if(!angular.isArray(values)){
      return;
    }
    angular.forEach(values, function(value){
      $scope.filteredValues.push($filter($scope.myFilter)(value));
    });
  });

});

HTML:

<div ng-controller="MainCtrl">
  <ul>
    <li ng-repeat="value in filteredValues">{{value}}</li>
  </ul>
</div>

Plunker.

Answer 4

One can implement filters programmatically, although achieving it that way may not be feasible. If you are comfortable with specifying filtered values within the controller, you could approach it similar to this:

JavaScript:

var app = angular.module('angularjs-starter', []);

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

  $scope.values = [new Date(-1), new Date()];

  $scope.myFilter = 'date';

  $scope.$watch('values', function(values){
    $scope.filteredValues = [];
    if(!angular.isArray(values)){
      return;
    }
    angular.forEach(values, function(value){
      $scope.filteredValues.push($filter($scope.myFilter)(value));
    });
  });

});

HTML:

<div ng-controller="MainCtrl">
  <ul>
    <li ng-repeat="value in filteredValues">{{value}}</li>
  </ul>
</div>

Plunker.

Answer 5

Answer №3

If you're looking for a more straightforward approach, consider invoking a function when displaying the value. This way, you have the flexibility to leverage the $filter service and incorporate your own custom logic as needed. Take a look at this example on Plunker.

app.controller('MainCtrl', function($scope, $filter) {
  $scope.values = ['Test #1', 'Test #2'];

  $scope.myFilter = 'uppercase';
  $scope.myFilterFn = function(value) {
    console.log(value);
    var filter = $filter($scope.myFilter);
    console.log(filter);
    return filter(value);
  };
});

Template:

<body ng-controller="MainCtrl">
  <p>{{myFilter}}</p>
  <button ng-click="myFilter = 'uppercase';">Uppercase</button>
  <button ng-click="myFilter = 'lowercase';">Lowercase</button>
  <p>
    <ul>
      <li ng-repeat="value in values">{{myFilterFn(value)}}</li>
    </ul>
  </p>
</body>

Answer 6

If you're looking for a more straightforward approach, consider invoking a function when displaying the value. This way, you have the flexibility to leverage the $filter service and incorporate your own custom logic as needed. Take a look at this example on Plunker.

app.controller('MainCtrl', function($scope, $filter) {
  $scope.values = ['Test #1', 'Test #2'];

  $scope.myFilter = 'uppercase';
  $scope.myFilterFn = function(value) {
    console.log(value);
    var filter = $filter($scope.myFilter);
    console.log(filter);
    return filter(value);
  };
});

Template:

<body ng-controller="MainCtrl">
  <p>{{myFilter}}</p>
  <button ng-click="myFilter = 'uppercase';">Uppercase</button>
  <button ng-click="myFilter = 'lowercase';">Lowercase</button>
  <p>
    <ul>
      <li ng-repeat="value in values">{{myFilterFn(value)}}</li>
    </ul>
  </p>
</body>

How to Dynamically Set AngularJS Filter (like date or currency) Using Variables

Answer №1

Answer №2

Answer №3

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