Enhancing Angular 6: Transforming the Add Method to Perform Updates on the View

Question

Enhancing Angular 6: Transforming the Add Method to Perform Updates on the View

Currently, I am in the process of modifying a collection of data that is being shown on app.component.html

<ul>
<li *ngFor="let data of DataSource"> 
        {{ data.id }} - {{data.title}} 
</li>
</ul>

So far, I have successfully added a new row of data using the method below:

  create() {
    const newPostId = this.postId + 1;
    this.apiService.create(newPostId, this.postTitle, this.postText).subscribe(result => {
      const newId = result['id'];
      this.retrieveData.push({id: newId, title: this.postTitle});
      this.dataCount = this.dataCount + 1;
    }, error => console.log('There was an error: ', error));
  }

This method effectively adds the new data row to the end of the existing list.

Now, my question arises:

In what way can I modify the create() function to update an existing row and reflect these modifications in the app.component.html?

javascript angular typescript angular6

Answer 1

Answer №1

To accomplish the task of locating and updating an item in an array based on its id, you can follow these steps:

this.apiService.update(...).subscribe(response => {
  const updatedItemId: number = response['id'];
  const currentIndex = this.itemsArray.findIndex((item: {id: number}) => item.id === updatedItemId);
  if (currentIndex > -1) {
      // replace the old item with the updated one
      this.itemsArray.splice(currentIndex, 1, {id: updatedItemId, name: this.updatedItemName});
  } else {
     // Handle case where item was not found in the array
  }
}, err => console.log('Error occurred: ', err))

Answer 2

To accomplish the task of locating and updating an item in an array based on its id, you can follow these steps:

this.apiService.update(...).subscribe(response => {
  const updatedItemId: number = response['id'];
  const currentIndex = this.itemsArray.findIndex((item: {id: number}) => item.id === updatedItemId);
  if (currentIndex > -1) {
      // replace the old item with the updated one
      this.itemsArray.splice(currentIndex, 1, {id: updatedItemId, name: this.updatedItemName});
  } else {
     // Handle case where item was not found in the array
  }
}, err => console.log('Error occurred: ', err))

Enhancing Angular 6: Transforming the Add Method to Perform Updates on the View

Answer №1

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