Embeer.js Controller 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。我们可以使用此方法检索属性列表或单个属性。

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/路线/getProperties1.js

Javascript


import Route from '@ember/routing/route'; 
  
export default class FruitsRoute extends Route { 
    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'
        } 
    ]; 
    item2; 
    item3; 
  
    model() { 
        this.set('[]', this.fruits) 
        return this; 
    } 
    setupController(controller, model) { 
        super.setupController(controller, model); 
        controller.set('fruits', this.fruits); 
    } 
}

应用程序/控制器/getProperties1.js

Javascript


import Ember from "ember"; 
import { addObject, isAny, isEvery } from "@ember/array"; 
import EmberObject from '@ember/object'; 
  
const Fruit = EmberObject.extend({ 
    init() { 
        alert(`${this.getProperties('name').name}  
        is Added in list`); 
    } 
}); 
export default Ember.Controller.extend({ 
    actions: { 
        list() { 
            let list = ''; 
            this.fruits.map((item) => list += 
            item.name + ` is ${item.color}` + '\n'); 
            alert(list) 
        }, 
        insertItem(data, data1, data2) { 
            let temp = Fruit.create({ 
                name: data, 
                isFruit: data1, 
                color: data2 
            }); 
            this.fruits.addObject(temp); 
        } 
    }, 
});

应用程序/模板/getProperties1.hbs

HTML


<h3>List of Fruits:</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}}

输出：

Ember.js 控制器 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/路线/getProperties2.js

Javascript


import Route from '@ember/routing/route'; 
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}`; 
        }), 
  
}); 
export default class PartyRoute extends Route { 
    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', 
    }]; 
  
    item3 = 'Gulshan'; 
    item2 = 'Verma'; 
    item1 = 'stu6'; 
    model() { 
        return this.students; 
    } 
    setupController(controller, model) { 
        super.setupController(controller, model); 
        controller.set('students', this.students); 
        controller.set('temp', this.temp); 
        controller.set('item1', this.item1); 
        controller.set('item2', this.item2); 
        controller.set('item3', this.item3); 
    } 
}

应用程序/控制器/getProperties2.js

Javascript


import Controller from '@ember/controller'; 
import { action, find } from '@ember/object'; 
import Ember from 'ember'; 
  
let Student = Ember.Object.extend({ 
    // these will be supplied by `create` 
    Name: null, 
    skill: null, 
    id: null, 
  
    init() { 
        alert(`${this.getProperties('Name').Name} is Listed`); 
    }, 
    fullName: Ember.computed('firstName', 'lastName', 
        function () { 
            return `${this.firstName} ${this.lastName}`; 
        }), 
  
    Changed: Ember.observer('fullName', 
        function () { 
            console.log(`fullName changed to: ${this.fullName}`); 
        }), 
}); 
export default class Array2Controller extends Controller { 
  
    @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/模板/getProperties2.hbs

HTML


<table> 
    <tr> 
        <th>Name</th> 
        <th>skill</th> 
        <th>Id</th> 
    </tr> 
      {{#each @model as |details|}} 
    <tr> 
            <td>{{details.Name}}</td> 
            <td>{{details.skill}}</td> 
            <td>{{details.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'}}/>

输出：

Ember.js 控制器 getProperties() 方法

参考：https://api.emberjs.com/ember/4.6/classes/Controller/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 Controller 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。