Embeer.js Component get()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。

get() 方法用於從對象獲取屬性值。此方法類似於object.keyName，它支持計算屬性和unknownProperty 處理程序。

用法:

get( keyName );

參數：

key: 要檢索的屬性名稱。

返回值：如果鍵不存在，則此方法返回屬性值或未定義。

安裝和運行 Ember.js 的步驟：

步驟 1：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

第 2 步：現在，您可以通過輸入以下代碼來創建項目：

ember new <project-name> --lang en

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 get1

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);
},
@action
removeItem(data) {
    let temp = this.fruits.find((item) => 
    item.color == data)
    this.fruits.set('[]', this.fruits.without(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>
<br />
<div>
    <label>Enter Fruit color: </label>
    {{input value=this.item4}}
</div><br />
<div>
    <input
        type="button"
        id="remove-item"
        value="Remove Fruit"
        {{action "removeItem" this.item4}}
    />
</div>
{{outlet}}

應用程序/模板/get1.hbs

HTML


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

輸出：

Ember.js 組件 get() 方法

示例 2：鍵入以下代碼以生成本示例的路由：

ember generate route get2

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(`${this.get('Name')} is Listed`);
    },
    fullName: Ember.computed('firstName', 'lastName', function () {
        return `${this.firstName} ${this.lastName}`;
    }),
    Changed: Ember.observer('fullName', function () {
        console.log(`fullName changed to: ${this.fullName}`);
    }),
});
export default Ember.Component.extend({
    students: [{
        Name: 'Balit',
        skill: 'Python',
        Id: 'stu2',
    },
    {
        Name: 'Permu',
        skill: 'PHP',
        Id: 'stu0',
    },
    {
        Name: 'Sam',
        skill: 'R',
        Id: 'stu1',
    },
    {
        Name: 'Pokhu',
        skill: 'JavaScript',
        Id: 'stu3',
    },
    {
        Name: 'Tanu',
        skill: 'Java',
        Id: 'stu4',
    },
    {
        Name: 'Arabh',
        skill: 'c++',
        Id: 'stu5',
    }], 
  @tracked
item3: 'Gulshan',
  @tracked
item2: 'Angular',
  @tracked
item1: 'stu6',
  @tracked
item4: 'Sam',
  @action
print(data1, data2, data3) {
    let temp = Student.create({
        Name: data1,
        skill: data2,
        Id: data3
    });
    this.students.addObject(temp);
},
@action
remove(data1) {
    let temp = this.students.find((item) => 
    item.Name == data1)
    this.students.set('[]', this.students.without(temp));
}
})

應用程序/組件/arr2.hbs

HTML


\{{yield}}
<table>
    <tr>
        <th>Name</th>
        <th>skill</th>
        <th>Id</th>
    </tr>
    {{#each this.students as |detail|}}
        <tr>
            <td>{{detail.Name}}</td>
            <td>{{detail.skill}}</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}}
/>
<br />
<br />
<div>
    <label>Enter Student Name: </label>
    {{input value=this.item4}}
</div>
<br />
<input
    type="button"
    id="remove-student"
    value="Remove Student"
    {{action "remove" this.item4}}
/>

應用程序/模板/get2.hbs

HTML


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

輸出：

Ember.js 組件 get() 方法

參考：https://api.emberjs.com/ember/4.6/classes/Component/methods/get?anchor=get

相關用法

注：本文由純淨天空篩選整理自satyam00so大神的英文原創作品 Ember.js Component get() 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。