Shailendra Chauhan
18
JunUnderstanding ng-if, ng-switch and ng-repeat directives
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1 min read
04 Aug 2022
Intermediate
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AngularJS provides you ng-if, ng-switch directives to display HTML elements based on conditions or cases. ng-repeat directive is used to generate HTML from a collection of items.
ng-if
This directive can add / remove HTML elements from the DOM based on an expression. If the expression is true, it add HTML elements to DOM, otherwise HTML elements are removed from the DOM.
<div ng-controller="MyCtrl">
<div ng-if="data.isVisible">ng-if Visible</div>
</div>
<script>
var app = angular.module("app", []);
app.controller("MyCtrl", function ($scope) {
$scope.data = {};
$scope.data.isVisible = true;
});
</script>
ng-switch
This directive can add / remove HTML elements from the DOM conditionally based on scope expression.
<div ng-controller="MyCtrl">
<div ng-switch on="data.case">
<div ng-switch-when="1">Shown when case is 1</div>
<div ng-switch-when="2">Shown when case is 2</div>
<div ng-switch-default>Shown when case is anything else than 1 and 2</div>
</div>
</div>
<script>
var app = angular.module("app", []);
app.controller("MyCtrl", function ($scope) {
$scope.data = {};
$scope.data.case = true;
});
</script>
ng-repeat
This directive is used to iterate over a collection of items and generate HTML from it.
<div ng-controller="MyCtrl">
<ul>
<li ng-repeat="name in names">
{{ name }}
</li>
</ul>
</div>
<script>
var app = angular.module("app", []);
app.controller("MyCtrl", function ($scope) {
$scope.names = ['Shailendra', 'Deepak', 'Kamal'];
});
</script>
What do you think?
I hope you will enjoy the ng-if, ng-switch and ng-repeat directives in AngularJS while developing your app with AngularJS. I would like to have feedback from my blog readers. Your valuable feedback, question, or comments about this article are always welcome.
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