A guide to invoking a function from another component in Angular

Question

A guide to invoking a function from another component in Angular

analytics.js

fetchAnalyticsData() {
    this.loading.today = true;
    this.loading.daily = true;

    const metrics = ['VISITS', 'PAGE VIEWS', 'CONVERSION RATE', 'BOUNCE RATE'];
    const analyticsModules = [
      { endpoint: '', parameters: { to: format(TODAY, DATE_FORMAT).toString(), from: format(TODAY, DATE_FORMAT).toString() } },
      {
        endpoint: 'traffic-source',
        parameters: { to: format(TODAY, DATE_FORMAT).toString(), from: format(TODAY, DATE_FORMAT).toString() }
      },
      {
        endpoint: 'user-demographics',
        parameters: {
          to: format(endOfWeek(TODAY), DATE_FORMAT).toString(),
          from: format(startOfWeek(TODAY), DATE_FORMAT).toString()
        }
      },
      {
        endpoint: 'engagement-metrics',
        parameters: {
          to: format(endOfWeek(TODAY), DATE_FORMAT).toString(),
          from: format(startOfWeek(TODAY), DATE_FORMAT).toString()
        }
      }
    ];
}

How do I invoke the fetchAnalyticsData function in my dashboard.js?

I am looking to execute the fetchAnalyticsData function in the dashboard.js file.

For instance, within my dashboard.js, I have a method called

updateChart() { ... } where I wish to trigger the fetchAnalyticsData function from analytics.js

javascript angular typescript

Answer 1

Answer №1

It is not recommended to directly call a component function.

A better approach would be to create a service and include the function getReports in that service. Then, you can utilize this service in all components where you need to access this function.

Answer 2

It is not recommended to directly call a component function.

A better approach would be to create a service and include the function getReports in that service. Then, you can utilize this service in all components where you need to access this function.

Answer 3

Answer №2

Communicating between sibling components in Angular

Shared Application Model: In Angular, sibling components can communicate through a shared application model similar to Angular 1. If one sibling updates a model, the other sibling with bindings to the same model will automatically reflect those changes.

Component Events: Child components can emit events to the parent component using @Output() bindings. The parent component can then handle the event and update the application model or its own view model. Changes to the Application Model will be propagated to all components that are directly or indirectly connected to the same model.

Service Events: Components can also subscribe to service events. For instance, two sibling components can subscribe to the same service event and respond by adjusting their respective models accordingly.

If you need further assistance, please refer to this link.

Here is an example for your reference:

    @Injectable()
    export class CustomService {
        getReport = () => {}
    }

    // Utilizing the service
    export class ListReportComponent {
      constructor(private custom CustomService){}

       ngOnInit() {
        // This triggers the event and calls getReport
        this.custom.getReport();
       }
   }

Another approach involves using event emitters depending on the relationship between your components (parent/child). However, employing a shared service is considered the best and most generic way to facilitate communication among components.

import { Component, EventEmitter, Input, Output } from '@angular/core';

List Component

getReport = () => {
            // Your code here
}
<list-report [getReport]="getReport">Disagree</list-report>

ListReportComponent

export class ListReportComponent {
@Output() getReport = new EventEmitter<>();

ngOnInit() {
                // This emits the event and calls getReport
this.getReport.emit();
}
}

I hope this explanation proves helpful to you.

Answer 4

Communicating between sibling components in Angular

Shared Application Model: In Angular, sibling components can communicate through a shared application model similar to Angular 1. If one sibling updates a model, the other sibling with bindings to the same model will automatically reflect those changes.

Component Events: Child components can emit events to the parent component using @Output() bindings. The parent component can then handle the event and update the application model or its own view model. Changes to the Application Model will be propagated to all components that are directly or indirectly connected to the same model.

Service Events: Components can also subscribe to service events. For instance, two sibling components can subscribe to the same service event and respond by adjusting their respective models accordingly.

If you need further assistance, please refer to this link.

Here is an example for your reference:

    @Injectable()
    export class CustomService {
        getReport = () => {}
    }

    // Utilizing the service
    export class ListReportComponent {
      constructor(private custom CustomService){}

       ngOnInit() {
        // This triggers the event and calls getReport
        this.custom.getReport();
       }
   }

Another approach involves using event emitters depending on the relationship between your components (parent/child). However, employing a shared service is considered the best and most generic way to facilitate communication among components.

import { Component, EventEmitter, Input, Output } from '@angular/core';

List Component

getReport = () => {
            // Your code here
}
<list-report [getReport]="getReport">Disagree</list-report>

ListReportComponent

export class ListReportComponent {
@Output() getReport = new EventEmitter<>();

ngOnInit() {
                // This emits the event and calls getReport
this.getReport.emit();
}
}

I hope this explanation proves helpful to you.

Answer 5

Answer №3

When working with Angular, the use of a service or helper functions will depend on the specific use case. However, there may be instances where we need to access a method from a child component within a Parent Component. This can be achieved by following this example:

import { Component } from "@angular/core";

@Component({
  selector: "report",
  template: '<div>hi this is template</div>',
  styles:[]
})
export class ReportComponent {
  getReport() {
    console.log('hi get report')
  }
}

import { Component, ViewChild } from "@angular/core";
import { ReportComponent } from "./report.component";

@Component({
  selector: "report-list",
  template: `<div>
      <h4 (click)="callGetReport()">This is report List</h4>
      <report></report>  
  </div>`,
  styles: []
})
export class ReportListComponent {
  @ViewChild(ReportComponent) public report: ReportComponent;

  callGetReport() {
    this.report.getReport();
  }
}

Answer 6

When working with Angular, the use of a service or helper functions will depend on the specific use case. However, there may be instances where we need to access a method from a child component within a Parent Component. This can be achieved by following this example:

import { Component } from "@angular/core";

@Component({
  selector: "report",
  template: '<div>hi this is template</div>',
  styles:[]
})
export class ReportComponent {
  getReport() {
    console.log('hi get report')
  }
}

import { Component, ViewChild } from "@angular/core";
import { ReportComponent } from "./report.component";

@Component({
  selector: "report-list",
  template: `<div>
      <h4 (click)="callGetReport()">This is report List</h4>
      <report></report>  
  </div>`,
  styles: []
})
export class ReportListComponent {
  @ViewChild(ReportComponent) public report: ReportComponent;

  callGetReport() {
    this.report.getReport();
  }
}

Answer 7

Answer №4

Inter-component communication through direct calls or data access is not recommended as there is no official method for it.
To interact between two components, Input and Output attributes should be used. By passing input parameters to a child component using the input attribute, operations can be performed on the child component.

An alternative approach would be to create a service with an event emitter. The getReports() function could then be moved to this service and injected into the component that requires it.

Answer 8

Inter-component communication through direct calls or data access is not recommended as there is no official method for it.
To interact between two components, Input and Output attributes should be used. By passing input parameters to a child component using the input attribute, operations can be performed on the child component.

An alternative approach would be to create a service with an event emitter. The getReports() function could then be moved to this service and injected into the component that requires it.

A guide to invoking a function from another component in Angular

Answer №1

Answer №2

Answer №3

Answer №4

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