Ember.js EmberArray invoke() Method

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 invoke() method is used to invoke the named method for the item of the array.

Syntax:

invoke( methodName, args );

Parameters:

• methodName: It is the name method that we want to invoke.
• args: It is the argument value for the method.

Returns: It Returns a value from calling invoke.

Steps to Install and Run Ember.js:

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 serve

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

ember generate route invoke1

app/routes/invoke1.js

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

class Item {
    name = null;
    quant = null;
    bucket = null;
    constructor(name, quant, bucket) {
        this.name = name;
        this.quant = quant;
        this.bucket = bucket;
    }

    Show_quantity() {
        return `${this.name} is ${this.quant}
     in Bucket ${this.bucket}`;
    }
}
export default class
    RichestPeopleRoute extends Route {
    Items = [
        new Item('Tomato', 5, 1),
        new Item('Mango', 1.5, 2),
        new Item('Apple', 3, 2),
        new Item('Carrot', 2, 1),
        new Item('Onion', 1, 2),
        new Item('Cabage', 3, 1),
        new Item('Orange', 2, 1),

    ];
    model() {
        return this.Items;
    }
    setupController(controller, model) {
        super.setupController(controller, model);
        controller.set('Items', this.Items);
    }
}

app/controllers/invoke1.js

import Ember from 'ember';
import { invoke } from '@ember/array';

export default Ember.Controller.extend({
    actions: {
        invoke_Show() {
            let ans = this.Items.invoke('Show_quantity');
            alert(ans.join('\n'));
        },
    },
});

app/templates/invoke1.hbs

{{page-title "invoke"}}

<h2>List of Item with Quantity </h2>

<table
    style="border: 2px solid black;
       padding: 30px;"
>
    <tr>
        <th>Name</th>
        <th>Quantity</th>
        <th>Bucket</th>
    </tr>
    {{#each @model as |Eatable|}}
        <tr>
            <td>{{Eatable.name}}</td>
            <td>{{Eatable.quant}}</td>
            <td>{{Eatable.bucket}}</td>

        </tr>
    {{/each}}
</table>
<input
    type="button"
    id="greet"
    value="Show Quatity of each Item"
    {{action "invoke_Show"}}
/>

{{outlet}}

Output: Visit localhost:4200/invoke1 to view the output

Ember.js EmberArray invoke method

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

ember generate route invoke2

app/routes/invoke2.js

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

class student {
    name = null;
    gender = null;
    clas = null;
    grade = null;
    constructor(name, gender, clas, grade) {
        this.name = name;
        this.gender = gender;
        this.clas = clas;
        this.grade = grade
    }

    show_grade() {
        return `I am ${this.name} of
    Class ${this.clas} Get ${this.grade}`;

    }
}

export default class StudentsRoute extends Route {
    students = [new student('Aakash', 'M', 10, 'A',),
    new student('Soniya', 'F', 8, 'C'),
    new student('Esnoor', 'M', 9, 'C'),
    new student('Isha', 'F', 11, 'B',),
    new student('Doman', 'M', 12, 'B'),
    new student('Lolu', 'M', 10, 'A'),
    new student('Satyam', 'M', 10, 'A'),
    ];
    temp2;
    temp;
    model() {
        return this.students;
    }
    setupController(controller, model) {
        super.setupController(controller, model);
        controller.set('students', this.students);
        controller.set('temp', this.temp);
        controller.set('temp1', this.temp1);
        controller.set('temp2', this.temp2);
    }
}

app/controllers/invoke2.js

import Ember from 'ember';

export default Ember.Controller.extend({
    actions: {
        find_Data() {
            let ans = this.students.invoke('show_grade');
            alert(ans.join('\n'))
        },
    },
});

app/templates/invoke2.hbs

{{page-title "Student"}}
<h3>List of Students: </h3>
<br /><br />
<table>
    <tr>
        <th>Name</th>
        <th>Gender </th>
        <th>Class </th>
        <th>Grade </th>
    </tr>
    {{#each @model as |detail|}}
        <tr>
            <td>{{detail.name}}</td>
            <td> {{detail.gender}}</td>
            <td>{{detail.clas}}</td>
            <td>{{detail.grade}}</td>
        </tr>
    {{/each}}
</table>

<br />
<br />
<div>
    <input
        type="button"
        id="check-fruit"
        value="Student's Indroduction"
        {{action "find_Data"}}
    />
</div>

{{outlet}}

Output: Visit localhost:4200/invoke2 to view the output

Ember.js EmberArray invoke method

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