CODEWITHSUNDEEP
javascriptangularfirebase-realtime-databaseangularfire
student_it
student_it

Reputation: 89

Iterating over an object from the database

i'm doing project with angular and firebase. I get an object from firebase and I would like to display it in html, but I don't know how to get value from the object in the array. How can I iterate through auto indexes from the firebase ?

This is calls Firebase:

getListTasks() {
  return this.db.list('/Tasks').valueChanges();
}

This is my component:

this.taskService.getListTasks().subscribe(t => {
      this.todoTasks = t;
    });

This is my object in the array : https://i.sstatic.net/npowv.jpg

Upvotes: 0

Views: 187

Answers (2)

Kisinga
Kisinga

Reputation: 1729

You have to convert the object into an array for you to iterate over like below

  this.taskService.getListTasks().subscribe(tasks => {

  const tasksArray = Object.keys(tasks).map((key, index) => {
      const task = tasks[key];
      return task;
    });
    this.todoTasks = tasksArray;
  });

Angular also has a built in mechanism for doing this using the key-value pipe

I highly recommend this answer

Upvotes: 1

JuNe
JuNe

Reputation: 1997

Assuming that the todoTasks is an array, this is how you would implement.

<div *ngFor="let todo of todoTasks">
  <div *ngFor="let value of todo.myMap.values()">
    {{value.attribute}}
  </div>
</div>

Upvotes: 0

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