Embeer.js EmberObject init()用法及代碼示例

Ember.js 是一個開源 JavaScript 框架，用於開發基於 Model-View-Controller (MVC) 架構的大型客戶端 Web 應用程序。 Ember.js是使用最廣泛的前端應用框架之一。它的目的是加速開發並提高生產力。目前，它被大量網站使用，包括 Square、Discourse、Groupon、Linked In、Live Nation、Twitch 和 Chipotle。

init() 方法是每當實例化對象時都會調用的方法。默認情況下，此方法不會根據我們的使用進行任何操作。

用法:

init(){ // Algorithm };

安裝和運行 Ember.js 的步驟：

第 1 步：要運行以下示例，您需要有一個 ember 項目。要創建一個，您需要先安裝ember-cli。在終端中寫入以下代碼：

npm install ember-cli

步驟2：現在您可以通過輸入以下代碼來創建項目：

ember new <project-name> --lang en

步驟 3：要啟動服務器，請鍵入：

ember serve

示例 1：鍵入以下代碼以生成本示例的路由：

ember generate route init1

應用程序/組件/arr.js

Javascript


import Component from '@glimmer/component';
import Ember from 'ember';
import EmberObject from '@ember/object';
import { action, without, set, get } from '@ember/object';
const Fruit = EmberObject.extend({
    init() {
        alert(`${this.get('name')} is in list Now`);
    }
});
export default Ember.Component.extend({
    fruits: [
        {
            'name': 'Lady Finger',
            'isFruit': false,
            'color': 'green'
        },
        {
            'name': 'Brinjal',
            'isFruit': false,
            'color': 'purple'
        },
        {
            'name': 'Apple',
            'isFruit': true,
            'color': 'red'
        },
        {
            'name': 'Grapes',
            'isFruit': true,
            'color': 'green'
        },
        {
            'name': 'Mango',
            'isFruit': true,
            'color': 'yellow'
        },
        {
            'name': 'Watermelon',
            'isFruit': true,
            'color': 'red'
        },
        {
            'name': 'Orange',
            'isFruit': true,
            'color': 'orange'
        }
    ],
   
  @action
insertItem(data, data1, data2) {
    let temp = Fruit.create({
        name: data,
        isFruit: data1,
        color: data2
    });
    this.fruits.addObject(temp);
}
})

應用程序/組件/arr.hbs

HTML


{{page-title "Init"}}
<h3>{{yield}}</h3>
<table>
    <tr>
        <th>Name</th>
        <th>Fruit</th>
        <th>Color</th>
    </tr>
    {{#each this.fruits as |detail|}}
        <tr>
            <td>{{detail.name}}</td>
            <td>{{detail.isFruit}}</td>
            <td>{{detail.color}}</td>
        </tr>
    {{/each}}
</table>
<br /><br />
<div>
    <label>Enter Fruit Name: </label>
    {{input value=this.item1}}
</div><br />
<div>
    <label>Item is Fruit: </label>
    {{input value=this.item2}}
</div><br />
<div>
    <label>Enter Fruit color: </label>
    {{input value=this.item3}}
</div><br />
<div>
    <input
        type="button"
        id="insert-item"
        value="Insert Fruit"
        {{action "insertItem" 
         this.item1 this.item2 this.item3}}
    />
</div>
{{outlet}}

應用程序/模板/init1.hbs

HTML


<Arr>
    <h3>Fruit's List :</h3>
</Arr>

輸出：

Ember.js EmberObject init() 方法

示例 2：鍵入以下代碼以生成本示例的路由：

ember generate route init2

應用程序/組件/arr2.js

Javascript


import Component from '@glimmer/component';
import { tracked } from '@glimmer/tracking';
import { action } from '@ember/object';
import Ember from 'ember';
let Student = Ember.Object.extend({
    // These will be supplied by `create`
    firstName: null,
    lastName: null,
    init() {
        alert(`${this.get('firstName')} is Listed`);
    },
    fullName: Ember.computed('firstName', 'lastName', function () {
        return `${this.firstName} ${this.lastName}`;
    }),
    Changed: Ember.observer('fullName', function () {
        console.log(`fullName changed to: ${this.fullName}`);
    }),
});
export default Ember.Component.extend({
    students: [
        Student.create({
            firstName: 'Balit',
            lastName: 'stark',
            Id: 'stu2',
        }),
        Student.create({
            firstName: 'Permu',
            lastName: 'scott',
            Id: 'stu0',
        }),
        Student.create({
            firstName: 'Sam',
            lastName: 'melo',
            Id: 'stu1',
        }),
        Student.create({
            firstName: 'Pokhu',
            lastName: 'Verma',
            Id: 'stu3',
        }),
        Student.create({
            firstName: 'Tanu',
            lastName: 'Agrawal',
            Id: 'stu4',
        }),
        Student.create({
            firstName: 'Arabh',
            lastName: 'Singh',
            Id: 'stu5',
        })], 
  @tracked
item3: 'Gulshan',
  @tracked
item2: 'Verma',
  @tracked
item1: 'stu6',
  @action
print(data1, data2, data3) {
    let temp = Student.create({
        firstName: data1,
        lastName: data2,
        Id: data3
    });
    this.students.addObject(temp);
}
})

應用程序/組件/arr2.hbs

HTML


{{yield}}
<table>
    <tr>
        <th>Name</th>
        <th>Id</th>
    </tr>
    {{#each this.students as |detail|}}
        <tr>
            <td>{{detail.fullName}}</td>
            <td>{{get detail "Id"}}</td>
        </tr>
    {{/each}}
</table>
<br />
<div>
    <label>Enter Student FirstName: </label>
    {{input value=this.item3}}
</div>
<br />
<div>
    <label>Enter Student LastName: </label>
    {{input value=this.item2}}
</div>
<br />
<div>
    <label>Enter Student Id: </label>
    {{input value=this.item1}}
</div>
<br />
<input
    type="button"
    id="set-code"
    value="Update Student details"
    {{action "print" this.item3 this.item2 
     this.item1}}
/>

應用程序/模板/init2.hbs

HTML


<Arr2>
    <h3>
        Student's List :
    </h3>
</Arr2>

輸出：

Ember.js EmberObject init() 方法

參考：https://api.emberjs.com/ember/4.6/classes/EmberObject/methods/init?anchor=init

相關用法

注：本文由純淨天空篩選整理自jeemains0neet大神的英文原創作品 Ember.js EmberObject init() Method。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。