AngularJS ng-style with a conditional expression

I am handling my issue like this:

ng-style="{ width: getTheValue() }" 

But to avoid having this function on the controller side, I would much prefer to do something like this:

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

How can I do this?

11 Answers

simple example:

<div ng-style="isTrue && {'background-color':'green'} || {'background-color': 'blue'}"></div> 

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

OR the same result:

<div ng-style="isTrue && {'background-color':'green'}"></div> 

other conditional possibility:

<div ng-style="count === 0 && {'background-color':'green'} || count === 1 && {'background-color':'yellow'}"></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=""></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>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

I am doing like below for multiple and independent conditions and it works like charm:

<div ng-style="{{valueFromJS}} === 'Hello' ? {'color': 'red'} : {'color': ''} && valueFromNG-Repeat === '{{dayOfToday}}' ? {'font-weight': 'bold'} : {'font-weight': 'normal'}"></div> 

also this syntax for ternary operator will work:

 ng-style="<$scope.var><condition> ? { '<css-prop-1>':((<value>) / (<value2>)*100)+'%', '<css-prop-2>':'<string>' } : { '<css-prop-1>':'<string>', '<css-prop-2>':'<string>' }" 

where <value> are $scope property values. In example:

ng-style="column.histograms.value=>0 ? { 'width':((column.histograms.value) / (column.histograms.limit)*100)+'%', 'background':'#F03040' } : { 'width':'1px', 'background':'#2E92FA' }" 

this allows for some calculaton into the css property values.

EDIT:

Ok i was previously not aware that AngularJS usually refers to Angular v1 version and only Angular to Angular v2+

This answer only applies for Angular

Leaving this here for future reference..

Not sure how it works for you guys but on Angular 9 i have to wrap ngStyle in brackets like this:

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

Otherwise it doesn't work

I am using ng-class for adding style :-

 ng-class="column.label=='Description' ? 'tableStyle': column.label == 'Markdown Type' ? 'Mtype' : column.label == 'Coupon Number' ? 'couponNur' : '' " 

Using ternary operator along with ng-class directives in angular.js for giving style. Then define the style for class in .css or .scss file. Eg :-

.Mtype{ width: 90px !important; min-width: 90px !important; max-width: 90px !important; } .tableStyle{ width: 129px !important; min-width: 129px !important; max-width: 129px !important; } .couponNur{ width: 250px !important; min-width: 250px !important; max-width: 250px !important; }