Ember.js ArrayProxy removeAt() Method

Last Updated : 14 Dec, 2022

Ember.js is an open-source JavaScript framework used for developing large client-side web applications which are based on Model-View-Controller (MVC) architecture. Ember.js is one of the most widely used front-end application frameworks. It is made to speed up development and increase productivity. Currently, it is utilized by a large number of websites, including Square, Discourse, Groupon, Linked In, Live Nation, Twitch, and Chipotle.

The removeAt() method is used to remove an object at a specified index from the array.

Syntax:

remove( start, len );

Parameters:

start: It is the starting index from where the removal of elements starts.
len: It is the length till where an element has to remove.

Return Value: A receiver.

To run the following examples you will need to have an ember project with you. To create one, you will need to install ember-cli first. Write the below code in the terminal:

npm install ember-cli

Now you can create the project by typing in the following piece of code:

ember new <project-name> --lang en

To start the server, type:

ember server

Example 1: Type the following code to generate the route for this example:

ember generate route removeAt1

app/routes/removeAt1.js

import Route from '@ember/routing/route'; 
  
export default class PartyRoute extends Route { 
    partyItems = [ 
        'Oxygen', 
        'Source Code', 
        'Infine', 
        'Tenet', 
        'SpiderHead', 
        'The Thing', 
        'A Quiet Place', 
        'The Invisible Man', 
        'Looper', 
        'Ad Astra'
    ]; 
    temp = [ 
        'Shutter Island', 
        'Matrix', 
        'Avatar', 
        'Fantastic Beast', 
        'Avengers', 
        'Fantastic four', 
        'Hulk', 
        'Superman', 
        'Spiderman', 
        'The Batman'
    ]; 
    item; 
    idx; 
    model() { 
        return this.partyItems; 
    } 
    setupController(controller, model) { 
        super.setupController(controller, model); 
        controller.set('partyItems', this.partyItems); 
        controller.set('item', this.item); 
        controller.set('idx', this.idx); 
        controller.set('temp', this.temp); 
    } 
} 

app/controllers/removeAt1.js

import Ember from 'ember'; 
import { pushObject, reduce, reject, removeAt, removeObject, pushObjects } from '@ember/array'; 
  
export default Ember.Controller.extend({ 
    actions: { 
        insertItem(item) { 
            this.partyItems.pushObject(item); 
        }, 
        push_item(data) { 
            this.partyItems.pushObjects(data); 
        }, 
        print_item() { 
            let ans = this.partyItems.reduce((acc, curr) =>  
            acc += '\n' + curr); 
            alert(ans) 
        }, 
        searchItem(data) { 
            let ans = this.partyItems.reject((movie) =>  
            movie.slice(0, 1) != data); 
            alert(ans.join('\n')) 
        }, 
        removeItem(data) { 
            this.partyItems.removeObject(data); 
  
        }, 
        removeItemAt(data) { 
            this.partyItems.removeAt(JSON.parse(data)); 
        }, 
    }, 
}); 

app/templates/removeAt1.hbs

{{page-title "removeAt"}} 
<h3>Here is a list of items: </h3> 
<ul> 
    {{#each @model as |party|}} 
        <li>{{party}}</li> 
    {{/each}} 
</ul> 
<br /> 
<div> 
    <label>Enter character: </label> 
    {{input value=this.item}} 
</div> 
<div> 
    <input 
        type="button"
        id="search-item"
        value="Search Movie Name Start with latter"
        {{action "searchItem" this.item}} 
    /> 
</div> 
<br /> 
<div> 
    <label>Enter Index: </label> 
    {{input value=this.item4}} 
</div> 
<div> 
    <input 
        type="button"
        id="remove-item-At"
        value="Remove Movie At index"
        {{action "removeItemAt" this.item4}} 
    /> 
</div> 
<br /> 
<div> 
    <label>Enter Item: </label> 
    {{input value=this.item3}} 
</div> 
<div> 
    <input 
        type="button"
        id="remove-item"
        value="Remove Movie"
        {{action "removeItem" this.item3}} 
    /> 
</div> 
<br /> 
<div> 
    <label>Enter Item: </label> 
    {{input value=this.item2}} 
</div> 
<div> 
    <input 
        type="button"
        id="insert-item"
        value="Insert Item"
        {{action "insertItem" this.item2}} 
    /> 
</div> 
<br /> 
<input 
    type="button"
    id="contains-item"
    value="Add Movies"
    {{action "push_item" this.temp}} 
/> 
<br /><br /> 
<input 
    type="button"
    id="show-item"
    value="List All Movies"
    {{action "print_item"}} 
/> 
{{outlet}}

Output: Visit localhost:4200/removeAt1 to view the output

Ember.js ArrayProxy removeAt method

Example 2: Type the following code to generate the route for this example:

ember generate route removeAt2

app/routes/removeAt2.js

import Route from '@ember/routing/route'; 
  
export default class ListRoute extends Route { 
    list = [1, 2, 3, 5, 6, 7, 8, 9]; 
    list1 = [21, 24, 12, 22, 26, 12]; 
    item; 
    idx; 
    model() { 
        return this.list; 
    } 
    setupController(controller, model) { 
        super.setupController(controller, model); 
        controller.set('list', this.list); 
        controller.set('item', this.item); 
        controller.set('idx', this.idx); 
        controller.set('list1', this.list1); 
    } 
}

app/controllers/removeAt2.js

import Ember from 'ember'; 
import { pushObject, pushObjects, reduce, reject, removeAt, removeObject } 
    from '@ember/array'; 
  
export default Ember.Controller.extend({ 
    actions: { 
        insertItem(item) { 
            this.list.pushObject(JSON.parse(item)); 
        }, 
        insertItems() { 
            this.list.pushObjects(this.list1); 
        }, 
        sumItems() { 
            let ans = this.list.reduce((acc, curr) =>  
            acc += curr); 
            alert(ans) 
        }, 
        printItems() { 
            let ans = this.list.reject((numb) =>  
            numb % 2 != 1); 
            alert(ans.join('\n')) 
        }, 
        removeItem(data) { 
            this.list.removeAt(JSON.parse(data)); 
  
        }, 
        removeObject(data) { 
            this.list.removeObject(JSON.parse(data)); 
  
        }, 
    }, 
}); 

app/templates/removeAt2.hbs

{{page-title "removeAt"}} 
<h3>Here is a list of Items: </h3> 
<ul> 
    {{#each @model as |i|}} 
        <li>{{i}}</li> 
    {{/each}} 
</ul> 
<br /> 
<div> 
    <label>Enter Item: </label> 
    {{input value=this.item3}} 
</div> 
<div> 
    <input 
        type="button"
        id="insert-item"
        value="Insert Item"
        {{action "insertItem" this.item3}} 
    /> 
</div> 
<br /> 
<div> 
    <label>Enter Item: </label> 
    {{input value=this.item2}} 
</div> 
<div> 
    <input 
        type="button"
        id="remove-Object"
        value="Remove Item"
        {{action "removeObject" this.item2}} 
    /> 
</div> 
<br /> 
<div> 
    <label>Enter Index: </label> 
    {{input value=this.item}} 
</div> 
<div> 
    <input 
        type="button"
        id="remove-item"
        value="Remove Item at Index"
        {{action "removeItem" this.item}} 
    /> 
</div> 
<br /> 
<div> 
    <input 
        type="button"
        id="print-item"
        value="Print Event Numbers"
        {{action "printItems"}} 
    /> 
</div><br /> 
<div> 
    <input 
        type="button"
        id="push-items"
        value="Insert more items"
        {{action "insertItems"}} 
    /> 
</div> 
<br /> 
<div> 
    <input 
        type="button"
        id="sum-item"
        value="Total sum"
        {{action "sumItems"}} 
    /> 
</div> 
{{outlet}}