How to use injected constants in html file in AngularJS

Question

I have a constant file which looks like this

demo.constant.js

// Add detail constans here
(function () {
    angular.module('myApp').constant('TYPE', {
        DYNAMIC: 'dynamic',
        STATIC: 'static'
    });
}());

Now I have a controller file that looks similar to this.

demo.controller.js

(function() {
    var DemoController = function(DEP1,DEP2, .... , TYPE)
    console.log(TYPE.DYNAMIC); // works perfectly
    var self = this;
    self.type = '';
    ...
    ...
    angular.module('myApp.controllers').controller('DemoController', DemoController);
})();

I am trying to access these constants in the HTML file like this:-

<div ng-controller="DemoController as self">
    <span ng-if="(self.type === 'dynamic')"> <!--instead of 'dynamic' I want to use TYPE.DYNAMIC-->
    ...
    ...
    ...
    </span>
</div>

Note:- {{self.type}} works but {{TYPE.DYNAMIC}} doesn't.

Another problem is that I want to use this constant as the value of radio buttons.

somewhat like this:-

<input type="radio" name="type" ng-model="self.inputType" value="dynamic"> <!-- Here I want to use TYPE.DYNAMIC -->
<input type="radio" name="type" ng-model="self.inputType" value="static">  <!-- Same as above -->

I have searched everywhere but nothing seems to work. Please Help!!

georgeawg · Accepted Answer · 2019-12-31 15:08:32Z

1

One approach is to assign the constant to a controller property:

function DemoController(DEP1,DEP2, /*.... ,*/ TYPE) {
    console.log(TYPE.DYNAMIC); // works perfectly

    this.TYPE = TYPE;
}
angular.module('myApp.controllers').controller('DemoController', DemoController)

Then use it in the template:

<div ng-controller="DemoController as $ctrl">
    <span ng-if="$ctrl.type === $ctrl.TYPE.DYNAMIC">
    ...
    </span>
</div>

Note: The ng-if directive uses creates a child scope. Consider instead using the ng-show directive which uses CSS and less resources.

edited Dec 31, 2019 at 15:08

answered Dec 31, 2019 at 15:02

georgeawg

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Comments

Saghi Shiri · Accepted Answer · 2019-12-31 14:31:13Z

1

You can use $rootScope and initilize it in run phase:

angular.module('app')
  .run(function ($rootScope, TYPE) {
      $rootScope.TYPE = TYPE
   });

then you can use it directly in your HTML

answered Dec 31, 2019 at 14:31

Saghi Shiri

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