AngularJS ng-style with a conditional expression

Question

simple example:

<div ng-style="isTrue && {'background-color':'green'} || {'background-color': 'blue'}" style="width:200px;height:100px;border:1px solid gray;"></div>

{'background-color':'green'} RETURN true

OR the same result:

<div ng-style="isTrue && {'background-color':'green'}" style="width:200px;height:100px;border:1px solid gray;background-color: blue"></div>

other conditional possibility:

<div ng-style="count === 0 && {'background-color':'green'}  || count === 1 && {'background-color':'yellow'}" style="width:200px;height:100px;border:1px solid gray;background-color: blue"></div>

As @Yoshi said, from angular 1.1.5 you can use-it without any change.

If you use angular < 1.1.5, you can use ng-class.

.largeWidth {
    width: 100%;
}

.smallWidth {
    width: 0%;
}

// [...]

ng-class="{largeWidth: myVar == 'ok', smallWidth: myVar != 'ok'}"

You can achieve it like that:

ng-style="{ 'width' : (myObject.value == 'ok') ? '100%' : '0%' }"

@jfredsilva obviously has the simplest answer for the question:

ng-style="{ 'width' : (myObject.value == 'ok') ? '100%' : '0%' }"

However, you might really want to consider my answer for something more complex.

Ternary-like example:

<p ng-style="{width: {true:'100%',false:'0%'}[myObject.value == 'ok']}"></p>

Something more complex:

<p ng-style="{
   color:       {blueish: 'blue', greenish: 'green'}[ color ], 
  'font-size':  {0: '12px', 1: '18px', 2: '26px'}[ zoom ]
}">Test</p>

If $scope.color == 'blueish', the color will be 'blue'.

If $scope.zoom == 2, the font-size will be 26px.

angular.module('app',[]);
function MyCtrl($scope) {
  $scope.color = 'blueish';
  $scope.zoom = 2;
}

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.0.1/angular.min.js"></script>
<div ng-app="app" ng-controller="MyCtrl" ng-style="{
   color:       {blueish: 'blue', greenish: 'green'}[ color ], 
  'font-size':  {0: '12px', 1: '18px', 2: '26px'}[ zoom ]
}">
  color = {{color}}<br>
  zoom = {{zoom}}
</div>

if you want use with expression, the rigth way is :

<span class="ng-style: yourCondition && {color:'red'};">Sample Text</span>

but the best way is using ng-class

On a generic note, you can use a combination of ng-if and ng-style incorporate conditional changes with change in background image.

<span ng-if="selectedItem==item.id"
              ng-style="{'background-image':'url(../images/'+'{{item.id}}'+'_active.png)','background-size':'52px 57px','padding-top':'70px','background-repeat':'no-repeat','background-position': 'center'}"></span>
        <span ng-if="selectedItem!=item.id"
              ng-style="{'background-image':'url(../images/'+'{{item.id}}'+'_deactivated.png)','background-size':'52px 57px','padding-top':'70px','background-repeat':'no-repeat','background-position': 'center'}"></span>

For single css property

ng-style="1==1 && {'color':'red'}"

For multiple css properties below can be referred

ng-style="1==1 && {'color':'red','font-style': 'italic'}"

Replace 1==1 with your condition expression