adding and removing classes in angularJs using ng-click
JavascriptAngularjsAngularjs Ng-ClickNg ClassJavascript Problem Overview
I am trying to work how to add a class with ngClick. I have uploaded up my code onto plunker Click here. Looking at the angular documentation i can't figure out the exact way it should be done. Below is a snippet of my code. Can someone guide me in the right direction
<div ng-show="isVisible" ng-class="{'selected': $index==selectedIndex}" class="block"></div>
Controller
var app = angular.module("MyApp", []);
app.controller("subNavController", function ($scope){
$scope.toggle = function (){
$scope.isVisible = ! $scope.isVisible;
};
$scope.isVisible = false;
});
Javascript Solutions
Solution 1 - Javascript
I want to add or remove "active" class in my code dynamically on ng-click, here what I have done.
<ul ng-init="selectedTab = 'users'">
<li ng-class="{'active':selectedTab === 'users'}" ng-click="selectedTab = 'users'"><a href="#users" >Users</a></li>
<li ng-class="{'active':selectedTab === 'items'}" ng-click="selectedTab = 'items'"><a href="#items" >Items</a></li>
</ul>
Solution 2 - Javascript
You just need to bind a variable into the directive "ng-class" and change it from the controller. Here is an example of how to do this:
var app = angular.module("ap",[]);
app.controller("con",function($scope){
$scope.class = "red";
$scope.changeClass = function(){
if ($scope.class === "red")
$scope.class = "blue";
else
$scope.class = "red";
};
});
.red{
color:red;
}
.blue{
color:blue;
}
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<body ng-app="ap" ng-controller="con">
<div ng-class="class">{{class}}</div>
<button ng-click="changeClass()">Change Class</button>
</body>
Here is the example working on jsFiddle
Solution 3 - Javascript
There is a simple and clean way of doing this with only directives.
<div ng-class="{'class-name': clicked}" ng-click="clicked = !clicked"></div>
Solution 4 - Javascript
you can also do that in a directive, if you want to remove the previous class and add a new class
.directive('toggleClass', function() {
return {
restrict: 'A',
link: function(scope, element, attrs) {
element.bind('click', function() {
if(element.attr("class") == "glyphicon glyphicon-pencil") {
element.removeClass("glyphicon glyphicon-pencil");
element.addClass(attrs.toggleClass);
} else {
element.removeClass("glyphicon glyphicon-ok");
element.addClass("glyphicon glyphicon-pencil");
}
});
}
};
});
and in your template:
<i class="glyphicon glyphicon-pencil" toggle-class="glyphicon glyphicon-ok"></i>
Solution 5 - Javascript
You have it exactly right, all you have to do is set selectedIndex in your ng-click.
ng-click="selectedIndex = 1"
Here is how I implemented a set of buttons that change the ng-view, and highlights the button of the currently selected view.
<div id="sidebar" ng-init="partial = 'main'">
<div class="routeBtn" ng-class="{selected:partial=='main'}" ng-click="router('main')"><span>Main</span></div>
<div class="routeBtn" ng-class="{selected:partial=='view1'}" ng-click="router('view1')"><span>Resume</span></div>
<div class="routeBtn" ng-class="{selected:partial=='view2'}" ng-click="router('view2')"><span>Code</span></div>
<div class="routeBtn" ng-class="{selected:partial=='view3'}" ng-click="router('view3')"><span>Game</span></div>
</div>
and this in my controller.
$scope.router = function(endpoint) {
$location.path("/" + ($scope.partial = endpoint));
};
Solution 6 - Javascript
var app = angular.module("MyApp", []);
app.controller("subNavController", function ($scope){
$scope.toggle = function (){
$scope.isVisible = ! $scope.isVisible;
};
$scope.isVisible = false;
});
<div ng-show="isVisible" ng-class="{'active':isVisible}" class="block"></div>
Solution 7 - Javascript
I used Zack Argyle's suggestion above to get this, which I find very elegant:
CSS:
.active {
background-position: 0 -46px !important;
}
HTML:
<button ng-click="satisfaction = 'VeryHappy'" ng-class="{active:satisfaction == 'VeryHappy'}">
<img src="images/VeryHappy.png" style="height:24px;" />
</button>
<button ng-click="satisfaction = 'Happy'" ng-class="{active:satisfaction == 'Happy'}">
<img src="images/Happy.png" style="height:24px;" />
</button>
<button ng-click="satisfaction = 'Indifferent'" ng-class="{active:satisfaction == 'Indifferent'}">
<img src="images/Indifferent.png" style="height:24px;" />
</button>
<button ng-click="satisfaction = 'Unhappy'" ng-class="{active:satisfaction == 'Unhappy'}">
<img src="images/Unhappy.png" style="height:24px;" />
</button>
<button ng-click="satisfaction = 'VeryUnhappy'" ng-class="{active:satisfaction == 'VeryUnhappy'}">
<img src="images/VeryUnhappy.png" style="height:24px;" />
</button>
Solution 8 - Javascript
If you prefer separation of concerns such that logic for adding and removing classes happens on the controller, you can do this
controller
(function() {
angular.module('MyApp', []).controller('MyController', MyController);
function MyController() {
var vm = this;
vm.tab = 0;
vm.setTab = function(val) {
vm.tab = val;
};
vm.toggleClass = function(val) {
return val === vm.tab;
};
}
})();
HTML
<div ng-app="MyApp">
<ul class="" ng-controller="MyController as myCtrl">
<li ng-click="myCtrl.setTab(0)" ng-class="{'highlighted':myCtrl.toggleClass(0)}">One</li>
<li ng-click="myCtrl.setTab(1)" ng-class="{'highlighted':myCtrl.toggleClass(1)}">Two</li>
<li ng-click="myCtrl.setTab(2)" ng-class="{'highlighted':myCtrl.toggleClass(2)}">Three</li>
<li ng-click="myCtrl.setTab(3)" ng-class="{'highlighted':myCtrl.toggleClass(3)}">Four</li>
</ul>
CSS
.highlighted {
background-color: green;
color: white;
}
Solution 9 - Javascript
I can't believe how complex everyone is making this. This is actually very simple. Just paste this into your html (no directive./controller changes required - "bg-info" is a bootstrap class):
<div class="form-group col-md-12">
<div ng-class="{'bg-info': (!transport_type)}" ng-click="transport_type=false">CARS</div>
<div ng-class="{'bg-info': transport_type=='TRAINS'}" ng-click="transport_type='TRAINS'">TRAINS</div>
<div ng-class="{'bg-info': transport_type=='PLANES'}" ng-click="transport_type='PLANES'">PLANES</div>
</div>
Solution 10 - Javascript
for Reactive forms -
HTML file
<div class="col-sm-2">
<button type="button" [class]= "btn_class" id="b1" (click)="changeMe()">{{ btn_label }}</button>
</div>
TS file
changeMe() {
switch (this.btn_label) {
case 'Yes ': this.btn_label = 'Custom' ;
this.btn_class = 'btn btn-danger btn-lg btn-block';
break;
case 'Custom': this.btn_label = ' No ' ;
this.btn_class = 'btn btn-success btn-lg btn-block';
break;
case ' No ': this.btn_label = 'Yes ';
this.btn_class = 'btn btn-primary btn-lg btn-block';
break;
}