Sunday, 9 October 2016

Change the style of an element in various ways using Angular2

In this post we are going to see how to change the style of an element in various ways using Angualr2


<div class="container">
    <br />

        Height : <input type="text" [(ngModel)]="height">
        Background : <input type="text" [(ngModel)]="background">
        Class : <input type="text" [(ngModel)]="classname">
        <button type="submit" [style.height.px]="height" 
                [style.background]="background" 
                [class]="classname"            
                >Submit</button>
    </div>


From the above code you can see that the height, background, class name of a button is dynamically changed using ngModel, this model value is bind to the element by [style.propertyname], for setting a pixel value we have to bind like [style.propertyname.px] , for class it should mention as [class]



Output:
**************








<br/>
    <div class="container">       
        Font Size :<label>{{fontsize}}</label>
        <input style="width:400px" type="range" [(ngModel)]="fontsize" />
        <br/>
        <button type="submit" class="btn btn-primary" 
          [ngStyle]="{'font-size':fontsize+'px'}">Dynamic Font Size</button>
    </div>


From the above code you can see the ngmodel value is bind to the element with the [ngStyle] directly

Output:
***************











<div class="container">
        <br/>
        <button type="submit" (click)="newstyle={'color':'red','background':'blue'}">
                Change Style</button>
        <button type="submit" (click)="newstyle={'height':'40px'}">
                Change Height</button>
        <button type="submit" (click)="newstyle={}">Remove Style</button> <br/><br/>        
        <input type="text" [ngStyle]="newstyle" />    
    </div>

From the above code you can see the style itself created and changed directly.

Output:
***************

















From this code you can learn how to change the style of an element in various ways using Angular2

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