What is the correct procedure for updating data when utilizing a service to transfer information between two components in an application?

As I work on transferring data from one Angular component to another, everything seems fine in terms of displaying the data until I attempt to edit or update it. Despite adjusting functions, the issue persists, indicating a potential problem with my data binding.

<pre>{{tasklist | json}}</pre> >> //file that is coming from the service
// this is showing properly


<form (ngSubmit) = "updateTask(tasklist)">
    <mat-form-field>
        <mat-select placeholder="Choose Project"  name="projectlist">
            <mat-option value="{{prjlist.projectname}}" *ngFor="let prjlist of prjlist">{{prjlist.projectname}}</mat-option>
        </mat-select>
    </mat-form-field>
    ...
    [Content truncated for brevity]



export class TaskEditComponent implements OnInit {
    //hold services
    tasklist='';

    constructor(//import all services here so that it can show the data in the component of add task
        private taskServices: TaskService, 
        private objsServices : ObjectivesService,
        ...

        this.editServices.sharetask.subscribe(x => this.tasklist = x)
    }


      updateTask(tasklist:taskdb){
        this.taskServices.updateTask(tasklist);
      }


}



 updateTask(tasks:taskdb){
    this.taskDoc = this.tasklist.doc(`tasks/${tasks.id}`);
    this.taskDoc.update(tasks);
  }

Answer №1

To ensure your data stays synchronized across components, consider implementing a Subject object within your service as shown below.

tasks = new Subject<any>();

Whenever you make updates to the tasks object, simply invoke the next method on your Subject object to publish the new data, as illustrated here:

updateTask(newTasksObject){//blah //blah
this.tasks.next(newTasksObject);}

Subsequently, in every component where you want to maintain synchronicity with the tasks list object, subscribe to the existing Subject object in your service following this pattern:

yourService.tasks.subscribe(res=>{
//perform actions utilizing the res object, which represents the newTasksObject referenced earlier in the update method})

Best regards,

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