Tips for refreshing the appearance of a window in angular when it is resized

I have a chat feature integrated into my application. I am looking to dynamically resize an image within the chat window when the width of the window falls below a certain threshold. Is there a method available to modify the CSS style or class based on the current width?

My app is built using TypeScript, and I have access to the chat window's width through the following input:

@Input()
public chatWidth: number;

Within my HTML file, I attempted to implement a logic that would add a CSS class if the chatWidth property was less than 400 pixels:

<img *ngIf="upsell?.image?.url; let url" [src]="url" ng-class="{bigger-img : chatWidth < 400}">

However, this approach does not seem to be functioning as intended, and I am not receiving any error messages in my browser console.

cssangulartypescript

Answer №1

Utilize 

<img *ngIf="upsell?.image?.url; let url" [src]="url" [ngClass]="{'bigger-img': chatWidth < 400}">

For more details, click here for information on using the ngClass directive.

UPDATE

You may consider encapsulating the condition within a 'method' that returns a boolean defined in your corresponding component and then calling it in the template instead of declaring it directly in the template. In this scenario,

in component.ts,

checkChatWidth(): boolean {
  return this.chatWidth < 400;
}

subsequently, in your template,

<img *ngIf="upsell?.image?.url; let url" [src]="url" [ngClass]="{'bigger-img': checkChatWidth()}">

Be sure to handle any potential 'null' checks within your 'method' as required due to the possibility of not having a value for the 'chatWidth' input property based on your code structure.

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