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Ember.js EmberArray indexOf() Method

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Ember.js is an open-source JavaScript framework used for developing large client-side web applications which is 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 indexOf() method is used to find the index of a given object in the array.

Syntax:

indexOf( obj, startAt );

Parameters:

  • obj: It is the item whose index we have to find.
  • startAt: The index from where to start the search.

Returns: It returns the index or -1 if object is not present.

Installation Steps:

Step 1: 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

Step 2: 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 serve

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

ember generate route Index1

app/routes/Index1.js




import Route from '@ember/routing/route';
  
export default class ListRoute extends Route {
    list = ["apple", "grapes", "Banana"
        "Tomato", "Onion", "Potato", "Garlic",
        "Dosa", "Idali", "Samosa", "Orange"];
    temp;
    idx;
    model() {
        return this.list;
    }
    setupController(controller, model) {
        super.setupController(controller, model);
        controller.set('list', this.list);
        controller.set('temp', this.temp);
        controller.set('idx', this.idx);
    }
}


app/controllers/Index1.js




import Ember from 'ember';
import {
    clear, insertAt, indexOf, lastIndexOf,
    includes
} from '@ember/array';
  
export default Ember.Controller.extend({
    actions: {
        selectattr(temp) {
            this.set('temp', temp);
        },
        checkIndex(data) {
            let res = this.list.indexOf(data);
            alert((res != -1) ? `Index of ${data} is
            ${res}` : "List not contains item")
        },
    },
});


app/templates/Index1.hbs




{{page-title "List"}}
<h3>Here is a list of Items: </h3>
<ul>
    {{#each @model as |i|}}
        <li>{{i}}</li>
      {{/each}}
</ul>
<br /><br />
<br />
<div>
    <label>Select Attribute: </label>
      <select onchange={{action "selectattr"
      value="target.value"}}>
    {{#each this.list as |attribute|}}
        <option value={{attribute}}>{{attribute}}</option>
    {{/each}}
    </select>
</div>
<br />
<div>
    <input
        type="button"
        id="get-Index"
        value="Check Index"
        {{action "checkIndex" this.temp}}
      />
</div>
{{outlet}}


Output: Visit localhost:4200/Index1 to view the output

Ember.js EmberArray indexOf method

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

ember generate route Index2

app/routes/Index2.js




import Route from '@ember/routing/route';
  
export default class PartyRoute extends Route {
    student = [
        'Rahul',
        'Sam',
        'Chitransh',
        'Pankaj',
        'Yogesh',
        'Balit',
        'Pokhraj',
        'Gulshan',
        'Sameer',
        'Bhavesh',
        'Rohan',
        'Ranju',
        'Manisha',
        'Alok',
        'Chitransh'
    ];
    item;
    idx;
    model() {
        return this.student;
    }
    setupController(controller, model) {
        super.setupController(controller, model);
        controller.set('student', this.student);
        controller.set('item', this.item);
        controller.set('idx', this.idx);
    }
}


app/controllers/Index2.js




import Ember from 'ember';
import {
    insertAt, indexOf, lastIndexOf,
    includes
} from '@ember/array';
  
export default Ember.Controller.extend({
    actions: {
        insertItem(item, idx) {
            this.student.insertAt(idx - 1, item);
        },
        getRank(item) {
            let res = this.student.indexOf(item);
            alert(`Rank of ${item} : ${res + 1} `);
        },
    },
});


app/templates/Index2.hbs




{{page-title "Rank Of Student"}}
<h3>Rank of Students: </h3>
<ul>
    {{#each @model as |party|}}
        <li>{{party}}</li>
      {{/each}}
</ul>
<br /><br />
<div>
    <label>Enter Item: </label>
      {{input value=this.item}}
</div>
<div>
    <label>Enter Index: </label>
      {{input value=this.idx}}
</div>
<div>
    <input
        type="button"
        id="insert-item"
        value="Insert Item"
        {{action "insertItem" this.item this.idx}}
      />
</div>
<br /><br />
<div>
    <label>Enter Item: </label>
      {{input value=this.item}}
</div>
<div>
    <input
        type="button"
        id="first-index-item"
        value="Show Rank"
        {{action "getRank" this.item}}
      />
</div>
{{outlet}}


Output: Visit localhost:4200/Index1 to view the output

Ember.js EmberArray indexOf Method

Reference: https://api.emberjs.com/ember/4.4/classes/EmberArray/methods/indexOf?anchor=indexOf



Last Updated : 23 Dec, 2022
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