Ember.js EmberArray filterBy() Method

Ember.js is an open-source JavaScript framework used for developing large client-side web applications 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 filterBy() method is used to filter the array by the property and optional value.

Syntax:

filterBy( key, value );

Parameters:

• key: It is the property name that we have to test.
• value: It is the value against the property which we have to test.

Return Value: The filtered array.

Steps to Install and Run Ember.js:

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 filter-by1

app/routes/filter-by1.js

import Route from '@ember/routing/route';

export default class WebsitesRoute extends Route {
    food = [
        {
            food: 'apple',
            isFruit: true,
            Bucket: '1',
        },
        {
            food: 'Potato',
            isFruit: false,
            Bucket: '2',
        },
        {
            food: 'Banana',
            isFruit: true,
            Bucket: '1',
        },
        {
            food: 'Burgur',
            isFruit: false,
            Bucket: '2',
        },
        {
            food: 'Orange',
            isFruit: true,
            Bucket: '1',
        },
        {
            food: 'sandwitch',
            isFruit: false,
            Bucket: '2',
        },
        {
            food: 'bean',
            isFruit: false,
            Bucket: '2',
        },
    ];
    temp;
    model() {
        return this.food;
    }
    setupController(controller, model) {
        super.setupController(controller, model);
        controller.set('food', this.food);
        controller.set('temp', this.temp);
        controller.set('temp2', this.temp2);
    }
}

app/controllers/filter-by1.js

import Ember from 'ember';

export default Ember.Controller.extend({
    actions: {
        Select(data1) {
            let temp = this.food.
             filterBy('Bucket', data1);
            let ans = '';
            for (let i = 0; i < temp.length; i++)
                ans += temp[i].food + '\n';
            alert(ans);
        },

        allFruit() {
            let temp = this.food.
             filterBy('isFruit');
            let ans = '';
            for (let i = 0; i < temp.length; i++)
                ans += temp[i].food + '\n';
            alert(ans);
        },
        nonFruit() {
            let temp = this.food.
             filterBy('isFruit', false);
            let ans = '';
            for (let i = 0; i < temp.length; i++)
                ans += temp[i].food + '\n';
            alert(ans);
        },
    },
});

app/templates/filter-by1.hbs

{{page-title "filterBy"}}
<h3>Websites</h3>
<br /><br />
<table>
    <tr>
        <th> Food Name </th>
        <th>Bucket </th>
        <th>Fruit </th>
    </tr>
    {{#each @model as |website|}}
        <tr>
            <td>{{website.food}}</td>
            <td>{{website.Bucket}}</td>
            <td>{{website.isFruit}}</td>
        </tr>
    {{/each}}
</table>
<br /><br />
<input type="button" id="all-Fruits"
   value="All Fruit" {{action "allFruit"}} />
<br /><br />
<input
    type="button"
    id="BucketNo"
    value="All items except fruits"
    {{action "nonFruit"}}
/>
<br /><br />

<div>
    <label>Enter Bucket Number : </label>
    {{input value=this.temp2}}
</div>
<input
    type="button"
    id="all-Fruits"
    value="All Fruit"
    {{action "Select" this.temp2}}
/>
{{outlet}}

Output: Visit localhost:4200/filter-by1 to view the output

Ember.js EmberArray filterBy method

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

ember generate route filter-by2

app/routes/filter-by2.js

import Route from '@ember/routing/route';

export default class StudentsRoute extends Route {
    students = [
        {
            name: 'Aakash',
            gender: 'M',
            class: 10,
            grade: 'A',
        },
        {
            name: 'Soniya',
            gender: 'F',
            class: 8,
            grade: 'C',
        },
        {
            name: 'Sita',
            gender: 'F',
            class: 10,
            grade: 'A',
        },
        {
            name: 'Ram',
            gender: 'M',
            class: 10,
            grade: 'A',
        },
        {
            name: 'Esnoor',
            gender: 'M',
            class: 9,
            grade: 'C',
        },
        {
            name: 'Isha',
            gender: 'F',
            class: 19,
            grade: 'B',
        },
        {
            name: 'Doman',
            gender: 'M',
            class: 12,
            grade: 'B',
        },
        {
            name: 'Lolu',
            gender: 'M',
            class: 10,
            grade: 'A',
        },
        {
            name: 'Lucky',
            gender: 'M',
            class: 11,
            grade: 'F',
        },
        {
            name: 'Neha',
            gender: 'F',
            class: 10,
            grade: 'B',
        },
        {
            name: 'Balit',
            gender: 'M',
            class: 12,
            grade: 'F',
        },
        {
            name: 'Hillier Buchanan',
            gender: 'M',
            class: 12,
            grade: 'A',
        },
        {
            name: 'Aman',
            gender: 'M',
            class: 11,
            grade: 'B',
        },
        {
            name: 'Anuj',
            gender: 'M',
            class: 12,
            grade: 'F',
        },
        {
            name: 'Satyam',
            gender: 'M',
            class: 12,
            grade: 'F',
        },
        {
            name: 'Aayush',
            gender: 'M',
            class: 12,
            grade: 'C',
        },
    ];
    temp2;
    model() {
        return this.students;
    }
    setupController(controller, model) {
        super.setupController(controller, model);
        controller.set('students', this.students);
        controller.set('temp2', this.temp2);
    }
}

app/controllers/filter-by2.js

import Ember from 'ember';

export default Ember.Controller.extend({
    actions: {
        allPass() {
            let temp = this.students.
             filterBy('grade', 'F');
            let ans = '';
            for (let i = 0; i < temp.length; i++)
                ans += temp[i].name + '\n';
            alert(ans);
        },
        allFemale() {
            let temp = this.students.
             filterBy('gender', 'F');
            let ans = '';
            for (let i = 0; i < temp.length; i++)
                ans += temp[i].name + '\n';
            alert(ans);
        },
        allClass() {
            let temp = this.students.
            filterBy('class',
                JSON.parse(this.temp2));
            let ans = '';
            for (let i = 0; i < temp.length; i++)
                ans += temp[i].name + '\n';
            if (temp.length) {
                alert(`Students from
                 class ${this.temp2}
           are : \n${ans}`);
            } else {
                alert(`No student are
                 from class ${this.temp2}`);
            }
        },
    },
});

app/templates/filter-by2.hbs

{{page-title "Students"}}
<h3>List of Students: </h3>
<br /><br />
<table>
    <tr>
        <th>Name</th>
        <th>Class</th>
        <th>Gender</th>
        <th>Grade</th>
    </tr>
    {{#each @model as |student|}}
        <tr>
            <td>{{student.name}}</td>
            <td>{{student.class}}</td>
            <td>{{student.gender}}</td>
            <td>{{student.grade}}</td>
        </tr>
    {{/each}}
</table>
<br />
<input
    type="button"
    id="all-pass"
    value="Failed Student"
    {{action "allPass"}}
/>
<br /><br />
<input
    type="button"
    id="all-female"
    value="All are Female"
    {{action "allFemale"}}
/>
<br /><br />
<div>
    <label>Enter Class: </label>
    {{input value=this.temp2}}
</div>
<br />
<input
    type="button"
    id="all-class"
    value="All are in Same class"
    {{action "allClass" this.temp2}}
/>
{{outlet}}

Output: Visit localhost:4200/filter-by2 to view the output

Ember.js EmberArray filterBy method

Reference: https://api.emberjs.com/ember/4.6/classes/EmberArray/methods/filter?anchor=filterBy