My textarea has the CSS property height: auto;. However, I noticed that when I reset the variable associated with the [ngModel] of this textarea (e.g. using this.myNgModelVar = "";), the height of the textarea doesn't automatically decrease unless the user starts typing again.
I have been trying to find a solution to this issue but so far, without success. Then I thought about just refreshing the <textarea>. The question now is, how can I refresh/update it in Typescript?
One unconventional technique I employ to regenerate DOM elements may not be well-received by everyone.
<textarea *ngFor="let x of refresh"></textarea>
Subsequently, in your component.
@Component({...})
export public MyComponent {
public refresh = [1];
public constructor(private change: ChangeDetectorRef) {}
public refreshTextArea() {
this.refresh[0]++;
this.change.markForCheck();
}
}
This method is effective because *ngFor updates the collection of DOM elements when the array is modified. By incrementing this.refresh[0]++, we trigger the recreation of the DOM element within the *ngFor. Since the array contains only one element, a single <textarea> will be generated.
Other Angular developers might find this approach perplexing. Therefore, it is advisable to include explanatory comments detailing the reasoning behind its use.
An alternative solution involves utilizing *ngIf and a setTimeout to toggle a boolean value from false to true, enabling Angular to re-render the DOM elements. However, this option entails more code and can be even more bewildering (in my opinion).
If you need to update the Text Area, make sure to add ChangeDetectorRef in your component's constructor:
constructor(private cdr: ChangeDetectorRef)
Then, whenever you want to refresh it, simply use
this.cdr.detectChanges();
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