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change bootstrap class conditionally on DIV

user7000 Published in 2018-01-12 14:10:46Z

In my angular 4 app, I have a div which displays a message. This message should use class alert alert-success or alert alert-danger based on message shown. How I can I use one message and switch the class names.

<div class="alert alert-success" *ngIf="message.length > 0" >                                        
   <strong role="alert">{{message}}</strong>
Vivek Doshi
Vivek Doshi Reply to 2018-01-12 14:31:56Z

You can use this :

<div [ngClass]="{'class1': true, 'class2': true, 'class3': false}">...</div>


<div [ngClass]="{'class1 class2': true}">...</div>
santosh singh
santosh singh Reply to 2018-01-12 14:34:02Z

You can use ngClassbinding

  <div [ngClass]="message.length > 0? 'alert  alert-success' : 'alert  alert-danger'">
Sandip Jaiswal
Sandip Jaiswal Reply to 2018-01-12 14:14:52Z

You should use ngClass. Use following code:

<div class="alert" [ngClass]="{'alert-success': expression, 'alert-success': expression}"></div>

Hope it will help

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