What is the best way to showcase a firebase "row" containing two columns within an Ionic 2 application?

Currently in the process of developing an app to keep track of assignments using Ionic 2/Typescript and Firebase as the backend database. The main page displays a list of assignments retrieved from the database. Creating a new assignment requires the user to provide a title and due date, which are then stored as one entry in the database without any issues. However, I am facing difficulties getting the newly added entry to display back on the app interface. Previously, I had it working flawlessly with just one user input and an alert instead of a separate page for adding assignments, but encountered challenges when transitioning to a dedicated input page.

I need assistance or advice on whether the issue lies in how I add the entries or how I display them, or perhaps both - any guidance would be greatly appreciated!

Here is the Typescript code snippet for saving a new assignment:

saveItem(){
 var assignment = {
  title : this.title,
  due : this.due,
 }

this.assignments.push({
           assignment,
        });
}

This is the Ionic markup for adding a new assignment:

<form (submit) = "saveItem()" >
 <ion-item>
  <ion-label floating>Assignment Title</ion-label>
  <ion-input  type="text" [(ngModel)]="title" name="title"></ion-input>
 </ion-item>

 <ion-item>
  <ion-label floating>Date</ion-label>
   <ion-datetime displayFormat="MMM DD, YYYY HH:mm" [(ngModel)]="due" name="due"></ion-datetime>   
 </ion-item>

 <div padding>
  <button type="submit" color="primary" block >Save</button>
 </div>
</form>

For displaying the list of assignments, here is the corresponding Ionic code:

<ion-list>
 <ion-item *ngFor="let a of assignments | async" (click)="showOptions(a.$key, a.title, a.due)">
  {{a.assignment}}
 </ion-item>
</ion-list>

The following image illustrates how the data appears in the database: testentry

Answer №1

To handle displaying assignments effectively, create a new global array called assignmentsList. Keep the saveItem function as is, but implement the following adjustments:

In your view, update this line:

*ngFor="let a of assignments | async"

to:

*ngFor="let a of assignmentsList | async"

Add a on("child_added") event listener in your class. Include the following within your constructor:

this.assignmentsList = [];
this.assignments.on("child_added", snapshot => {
  this.assignmentsList.push(snapshot.val());
});

This code will retrieve all existing and newly added assignments from Firebase.

Feel free to reach out if you encounter any issues!

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