Embeer.js Component getProperties()用法及代码示例

Ember.js 是一个开源 JavaScript 框架，用于开发基于 Model-View-Controller (MVC) 架构的大型客户端 Web 应用程序。 Ember.js是使用最广泛的前端应用框架之一。它的目的是加速开发并提高生产力。目前，它被大量网站使用，包括 Square、Discourse、Groupon、Linked In、Live Nation、Twitch 和 Chipotle。

getProperties() 方法用于一次获取多个属性的值。此方法与键列表一起使用。

用法:

getProperties( list );

参数：

list: 它是要获取的 key 列表。

返回值：具有传递的键及其值的对象。

安装和运行 Ember.js 的步骤：

第 1 步：要运行以下示例，您需要有一个 ember 项目。要创建一个，您需要先安装ember-cli。在终端中写入以下代码：

npm install ember-cli

第 2 步：现在您可以通过输入以下代码来创建项目：

ember new <project-name> --lang en

要启动服务器，请键入：

ember serve

示例 1：键入以下代码以生成本示例的路由：

ember generate route getProperties1

应用程序/组件/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 
list() { 
    let list = ''; 
    this.fruits.map((item) => list +=  
    item.name + ` is ${item.color}` + '\n'); 
    alert(list) 
}, 
  
  
})

应用程序/组件/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 Furit"
        {{action "insertItem" this.item1 this.item2 this.item3}} 
    /> 
</div> 
<br /> 
<div> 
    <input
        type="button"
        id="list-item"
        value="Print Items"
        {{action "list"}} 
    /> 
</div> 
{{outlet}}

应用程序/模板/getProperties1.hbs

HTML


<Arr> 
    List of Fruits:  
</Arr>

输出：

Ember.js 组件 getProperties() 方法

示例 2：键入以下代码以生成本示例的路由：

ember generate route getProperties2

应用程序/组件/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 
show() { 
    let temp = ''; 
    this.students.map((item) => 
        temp += item.Name + '\n'); 
    alert(temp); 
} 
})

应用程序/组件/arr2.hbs

HTML


<h3>{{yield}}</h3> 
<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 /> 
<br /> 
<input
    type="button"
    id="list-student"
    value="List All Student"
    {{action "show"}} 
/>

应用程序/模板/getProperties2.hbs

HTML


<Arr2> 
    List of Students:  
</Arr2>

输出：

Ember.js 组件 getProperties() 方法

参考：https://api.emberjs.com/ember/4.6/classes/Component/methods/getProperties?anchor=getProperties

相关用法

注：本文由纯净天空筛选整理自jeemains0neet大神的英文原创作品 Ember.js Component getProperties() Method。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。