Troubleshooting: Updating parameter values between sibling components in Angular

I have a parent, child, and sibling component. Whenever the parameter value is changed in the child component, the method in the sibling component should trigger and receive the updated value.

My issue is that I can successfully trigger the method from the parent component to the sibling component, but there is a delay in receiving the updated value at trigger time.

I suspect that using two different approaches for passing parameters and triggering methods might be causing the problem. Can someone please assist?

The method triggers from the parent component when the zip code changes in the child component, but the zip code value is not received at the sibling component during the trigger event.

getSiblingSettingFn() {

}

Child Component

@Component({
    selector: 'child-cmp',
    template: '<p>child</p>'
})
class ChildCmp {
    @Output() childGInParameters = new EventEmitter<{ city: string, state: string, zip: string }>();

    city: any = "Palmdale";
    state: any = "CA";
    zip: any = "93551";

    setGeneralInfo() { // on change event
        this.childGInParameters.emit({ city: this.city, state: this.state, zip: this.zip });
    }
}

Parent Component

import { SiblingComponent } from '../SiblingComponent';
@Component({
    selector: 'parent-cmp',
    template: '<child-cmp (childGInParameters)="getGeneralInfo($event)" > </child-cmp>
                <br/>
                <sib-cmp [zip]="zip" [state]="state" [city]="city" ></sib-cmp>'
})
class ParentCmp {
    @ViewChild('SiblingComponent') sibchild: SiblingComponent;

    getGeneralInfo(childGInParameters: any) {
        this.city = childGInParameters.city;
        this.state = childGInParameters.state;
        this.zip = childGInParameters.zip;

        this.sibchild.getSiblingSettingFn();
    }
}

Sibling Component

@Component({
    selector: 'sib-cmp'
})
class SiblingComponent {
    @Input() zip: any;
    @Input() state: any;
    @Input() city: any;

    ngOnChanges(changes: SimpleChanges) {
        const c: SimpleChange = changes.zip;
        this.zip = c.currentValue;
    }

    getSiblingSettingFn() {
       
    }
}

Answer №1

Utilize Service to facilitate communication between components that do not have a direct parent-child relationship. This is particularly helpful when sharing data between sibling components or at different levels in the component hierarchy.

  • Transferring Data from Parent to Child: @Input
  • Transferring Data from Child to Parent: @ViewChild
  • Transferring Data from Child to Parent: @Output & EventEmitter
  • Sharing Data Between Multiple Components: Service

For more information on component interaction, visit -

Answer №2

Give this a shot, it's worth a try

ngOnChanges(changes: SimpleChanges) {
       if(changes.zip.previousValue){
          this.zip = changes.zip.currentValue;
       }
    }

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