remove-item.md

#18: 🗑 Remove item

The user should be able to remove any item, whether it's still active or completed. Removing an item will be done by clicking a button, aptly named "remove". In this chapter, we'll learn how to add this functionality to our project.

Add the "remove" button

First, we need to add the button to the item, so we'll work on the file todo-item.component.ts.

Add a "remove" button to the item template, with a click event handler that calls a removeItem method (which we'll create in a moment):

{% code title="src/app/todo-item/todo-item.component.ts" %}

template: `
  <div class="todo-item">
    {{ item.title }}

    <button class="btn btn-red" (click)="removeItem()">
      remove
    </button>
  </div>
`,

{% endcode %}

Add a new output to the TodoItemComponent class, which will emit the removed item to the list manager when a user presses its remove button:

{% code title="src/app/todo-item/todo-item.component.ts" %}

@Output() remove: EventEmitter<TodoItem> = new EventEmitter<TodoItem>();

{% endcode %}

Make sure to import both EventEmitter and Output:

{% code title="src/app/todo-item/todo-item.component.ts" %}

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

{% endcode %}

Add a method to the ItemComponent class to actually emit the event. This method will be called when the user clicks the "remove" button:

removeItem() {
  this.remove.emit(this.item);
}

Remove the todo item

Now that each todo item can emit its own removal, let's make sure that the list manager actually removes that same item from the list. For that, we'll work on the file list-manager.component.ts.

We need to respond to the remove event. Let's add it to the template, inside the <todo-item> tag:

{% code title="src/app/list-manager/list-manager.component.ts" %}

<app-todo-item [item]="todoItem"
               (remove)="removeItem($event)"></app-todo-item>

{% endcode %}

Now we just need to add the method removeItem() to the ListManagerComponent class, and use the todoListService 's method deleteItem which will remove the item from the list and update the local storage:

{% code title="src/app/list-manager/list-manager.component.ts" %}

removeItem(item) {
  this.todoListService.deleteItem(item);
}

{% endcode %}

{% hint style="info" %} 💾 Save your code to GitHub

StackBlitz users - press Save in the toolbar and continue to the next section of the tutorial.

Commit all your changes by running this command in your project directory.

git add -A && git commit -m "Your Message"

Push your changes to GitHub by running this command in your project directory.

git push

{% endhint %}

{% hint style="success" %} See the results on StackBlitz {% endhint %}