how to change icon in button on click with Angular Js

Question

I have the following code:

<md-button class="md-icon-button" aria-label="Favorite" hide-gt-sm ng-click="openLeftMenu()">
     <md-icon><i class="material-icons">menu</i></md-icon>
</md-button>

As you can see, inside md-button tag I have md-icon which contains an i element. I want to change the i tag when I click the button. This icon should change back when I click it again. Simply, I want a toggle effect with two icons and I want to achieve this using Angularjs.

Solution 1

You can use ng-switch, like with password redaction:

<md-button ng-switch="vm.isPasswordVisible" ng-click="vm.isPasswordVisible=!vm.isPasswordVisible" ng-class="md-icon-button">
  <md-icon ng-switch-when="false" md-font-library="material-icons"> visibility_off </md-icon>
  <md-icon ng-switch-when="true" md-font-library="material-icons"> visibility </md-icon>
</md-button>

Solution 2

You can use the ng-class directive

CODE

<md-button class="md-icon-button" aria-label="Favorite" hide-gt-sm ng-click="toggleButton()">
     <md-icon><i ng-class="{'material-icons' : toggle, 'material-icons2' : !toggle}">menu</i></md-icon>
</md-button>

CONTROLLER

$scope.toggleButton = function(){
    $scope.toggle = !$scope.toggle;
}