Is there a way to refresh or rerender the ngFor in a component (hello.component.ts)? I'm looking to display images or charts instead of text.
Check out this simple example for reference: Stackblitz
Here is a potential solution:
public show = true;
addData(data){
this.data.push(data);
this.reload();
}
reload() {
this.show = false;
setTimeout(() => this.show = true);
}
Not completely certain if I grasp what you need, but one solution could be to utilize a simple ngIf and zero-timeout method to refresh the component's template:
@Component({
selector: 'hello',
template: `<div *ngIf="show">
... your template
</div>`
})
export class HelloComponent {
public show = true;
// ... your code
reload() {
this.show = false;
setTimeout(() => this.show = true);
}
}
Simply call the reload function when you wish to "reload" your component. By changing the value of show to false and allowing for one event loop cycle (setTimeout), you essentially remove the inner template. Subsequently setting show back to true triggers the rendering of the inner template once more.
UPD. Additionally, you can prompt Angular to re-render specific data parts within your component's template by manually altering that data:
@Component({
selector: 'hello',
template: `...
<div *ngFor="let i of data">
{{i}}...
</div>`
})
export class HelloComponent {
public data = [];
// ... your code
reloadData() {
this.data = [...this.data];
}
}
This allows you to solely "reload" the data array, causing NgFor to handle the re-rendering of its inner template automatically. When assigning a new value to this.data (using spread operator), you instruct Angular to reconstruct the sections of the template bound with data.
One of the challenges we faced was making Angular recognize changes and redraw accordingly.
Working alongside a colleague, we explored multiple approaches to tackle this issue, which primarily involved filtering data.
In your shared StackBlitz example, you employ various techniques. I focused on a specific aspect: modifying the array used by ngFor to render DOM elements.
Explore the ngFor drawing update mutation here.
I also encountered a similar problem with my coworker when attempting to filter a list based on an input value without triggering a redraw in Angular. Our workaround involved incorporating ngModel into the input field.
Discover how ngFor handles drawing updates with ngModel integration.
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