Tips for implementing Angular date filter once a REST call is successful or after an event broadcast has been triggered

Question

Tips for implementing Angular date filter once a REST call is successful or after an event broadcast has been triggered

One challenge I'm facing involves using a REST API to retrieve date formatting information that is crucial for my custom date filter in Angular. My goal is to seamlessly integrate this date format into my view by utilizing the filter.

In my view, I have implemented something along these lines:

<span>{{vm.filters.fromDate | dateFilter}}</span>

The structure of my filter looks like this:

.filter('dateFilter', function( $filter, commonService ) {
      var dateFormat = commonService.getDateFormat();
      return function( inputDate ) {
          return $filter('date')( inputDate, dateFormat );
      };
 })

Additionally, there is a method within commonService called

commonService.setDateFormat( dateFormat )

, which is triggered upon successful completion of the REST call.

However, I am encountering an issue where the filter processes before the API response is received, resulting in an incorrect date format being displayed on the UI due to the inability to retrieve the correct format through commonService.getDateFormat().

I am seeking advice on the most effective approach to execute or load an Angular filter upon the success of a task or the broadcast of an event.

javascript angularjs angular-filters

Answer 1

Answer №1

To apply a custom date format in AngularJS, you can utilize the commonService.getDateFormat() function within the REST success callback and pass its value (Date Format) to the filter. See below for a sample code snippet:

angular.module('testApp', [])
            .filter('dateFilter', function($filter) {
                return function(inputDate, dateFormat) {
                    return $filter('date')(inputDate, dateFormat);
                };
            })
            .controller('AppCtrl', appCtrl);

        function appCtrl($timeout) {
        var vm = this;

        vm.init = function() {
          // Simulating a service callback
          $timeout(function () {
            vm.datetime = new Date();
            vm.dateFormat = 'yyyy-MM-dd';
          }, 1000);
        }
    }

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>

<body ng-app="testApp">
    <h1>This is a heading</h1>
    <div ng-controller="AppCtrl as vm" ng-init="vm.init()">
        <p>{{ vm.datetime | dateFilter: vm.dateFormat }}</p>
    </div>
</body>

Answer 2

To apply a custom date format in AngularJS, you can utilize the commonService.getDateFormat() function within the REST success callback and pass its value (Date Format) to the filter. See below for a sample code snippet:

angular.module('testApp', [])
            .filter('dateFilter', function($filter) {
                return function(inputDate, dateFormat) {
                    return $filter('date')(inputDate, dateFormat);
                };
            })
            .controller('AppCtrl', appCtrl);

        function appCtrl($timeout) {
        var vm = this;

        vm.init = function() {
          // Simulating a service callback
          $timeout(function () {
            vm.datetime = new Date();
            vm.dateFormat = 'yyyy-MM-dd';
          }, 1000);
        }
    }

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>

<body ng-app="testApp">
    <h1>This is a heading</h1>
    <div ng-controller="AppCtrl as vm" ng-init="vm.init()">
        <p>{{ vm.datetime | dateFilter: vm.dateFormat }}</p>
    </div>
</body>

Answer 3

Answer №2

If you want to make your filter stateful, you can do so by adding the $stateful property:

.filter('dateFilter', function () {
    var dateFormat = commonService.getDateFormat();
    function dateFilter(input) {
        if (dateFormat) {
            return $filter('date')( inputDate, dateFormat );
        } else {
            return "---"; //some placeholder until format is loaded
        }
     }
     dateFilter.$stateful = true; //important
     return dateFilter;
});

Alternatively, you can consider a different approach depending on your backend setup.

If you have control over your backend, you could include constants in your main view as a JavaScript object and then inject it into your Angular application using angular.constant.

If you provide more information about your backend configuration, I can offer a more tailored solution.

Another Option

If you prefer not to use stateful filters, you can create a filter with a pattern passed as a parameter:

.filter("dateFilter", function() { // register new filter
    return function(input, pattern) { // filter arguments
         ....
    };
});

Then, you can pass the pattern as an argument for the filter:

{{ vm.filters.fromDate | dateFilter: vm.pattern}}

In this scenario, Angular will detect when the parameter changes and update the filter accordingly.

Answer 4

If you want to make your filter stateful, you can do so by adding the $stateful property:

.filter('dateFilter', function () {
    var dateFormat = commonService.getDateFormat();
    function dateFilter(input) {
        if (dateFormat) {
            return $filter('date')( inputDate, dateFormat );
        } else {
            return "---"; //some placeholder until format is loaded
        }
     }
     dateFilter.$stateful = true; //important
     return dateFilter;
});

Alternatively, you can consider a different approach depending on your backend setup.

If you have control over your backend, you could include constants in your main view as a JavaScript object and then inject it into your Angular application using angular.constant.

If you provide more information about your backend configuration, I can offer a more tailored solution.

Another Option

If you prefer not to use stateful filters, you can create a filter with a pattern passed as a parameter:

.filter("dateFilter", function() { // register new filter
    return function(input, pattern) { // filter arguments
         ....
    };
});

Then, you can pass the pattern as an argument for the filter:

{{ vm.filters.fromDate | dateFilter: vm.pattern}}

In this scenario, Angular will detect when the parameter changes and update the filter accordingly.

Tips for implementing Angular date filter once a REST call is successful or after an event broadcast has been triggered

Answer №1

Answer №2

Another Option

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