Embeer.js ArrayProxy filterBy()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。

filterBy() 方法用于按属性和可选值过滤数组。

用法:

filterBy( key, value );

参数：

key: 它是我们想要其值的属性的名称。
value: 它是针对要检查的键的值。

返回值：过滤后的数组。

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 filterBy1

应用程序/路线/filterBy1.js


import Route from '@ember/routing/route'; 
  
class student { 
    name = null; 
    gender = null; 
    class = null; 
    grade = null; 
    constructor(name, gender, class, grade) { 
        this.name = name; 
        this.gender = gender; 
        this.class = class; 
        this.grade = grade; 
    } 
} 
  
export default class StudentsRoute extends Route { 
    students = [ 
        new student('Aakash', 'M', 10, 'P'), 
        new student('Soniya', 'F', 8, 'F'), 
        new student('Esnoor', 'M', 9, 'P'), 
        new student('Isha', 'F', 11, 'P'), 
        new student('Doman', 'M', 12, 'F'), 
        new student('Lolu', 'M', 10, 'P'), 
        new student('Satyam', 'M', 10, 'F'), 
    ]; 
    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); 
    } 
}

应用程序/控制器/filterBy1.js


import Ember from 'ember'; 
import { mapBy, every } from '@ember/array'; 
  
export default Ember.Controller.extend({ 
    actions: { 
        Every_Failed() { 
            let foo = this.students.filterBy('grade', 'F'); 
            let temp = ''; 
            for (let i = 0; i < foo.length; i++) 
                temp += foo[i].name + '\n'; 
            alert(temp); 
        }, 
        Every_Female() { 
            let foo = this.students.filterBy('gender', 'F'); 
            let temp = ''; 
            for (let i = 0; i < foo.length; i++) 
                temp += foo[i].name + '\n'; 
            alert(temp); 
        }, 
        Every_male() { 
            let foo = this.students.filterBy('gender', 'M'); 
            let temp = ''; 
            for (let i = 0; i < foo.length; i++) 
                temp += foo[i].name + '\n'; 
            alert(temp); 
        }, 
    }, 
});

应用程序/模板/filterBy1.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.class}}</td> 
        <td>{{detail.grade}}</td> 
    </tr> 
    {{/each}} 
</table> 
  
<br/> 
<br/> 
<div> 
    <input type="button"
        id="check-pass" 
        value="Failed Student" 
        {{action 'Every_Failed' }} /> 
</div> 
<br/> 
<div> 
    <input type="button"
        id="all-female" 
        value="All Female Student" 
        {{action 'Every_Female' }} /> 
</div> 
<br/> 
<div> 
    <input type="button"
        id="all-male" 
        value="All Male Student" 
        {{action 'Every_male' }} /> 
</div> 
{{outlet}}

输出：访问 localhost:4200/filterBy1 查看输出

Ember.js ArrayProxy filterBy 方法

示例 2：键入以下代码以生成本示例的路由：

ember generate route filterBy2

应用程序/路线/filterBy2.js


import Route from '@ember/routing/route'; 
  
export default class WebsitesRoute extends Route { 
    food = [ 
        { 
            food: 'apple', 
            isFruit: true, 
            Bucket: '1', 
        }, 
        { 
            food: 'Potato', 
            isFruit: false, 
            Bucket: '2', 
        }, 
        { 
            food: 'Banana', 
            isFruit: true, 
            Bucket: '1', 
        }, 
        { 
            food: 'Burgur', 
            isFruit: false, 
            Bucket: '2', 
        }, 
        { 
            food: 'Orange', 
            isFruit: true, 
            Bucket: '1', 
        }, 
        { 
            food: 'sandwitch', 
            isFruit: false, 
            Bucket: '2', 
        }, 
        { 
            food: 'bean', 
            isFruit: false, 
            Bucket: '2', 
        }, 
    ]; 
    temp; 
    model() { 
        return this.food; 
    } 
    setupController(controller, model) { 
        super.setupController(controller, model); 
        controller.set('food', this.food); 
        controller.set('temp', this.temp); 
        controller.set('temp2', this.temp2); 
    } 
}

应用程序/控制器/filterBy2.js


import Ember from 'ember'; 
  
export default Ember.Controller.extend({ 
    actions: { 
        Select(data1) { 
            let temp = this.food.filterBy('Bucket', data1); 
            let ans = ''; 
            for (let i = 0; i < temp.length; i++) ans += temp[i].food + '\n'; 
            alert(ans); 
        }, 
  
        allFruit() { 
            let temp = this.food.filterBy('isFruit'); 
            let ans = ''; 
            for (let i = 0; i < temp.length; i++) ans += temp[i].food + '\n'; 
            alert(ans); 
        }, 
        nonFruit() { 
            let temp = this.food.filterBy('isFruit', false); 
            let ans = ''; 
            for (let i = 0; i < temp.length; i++) ans += temp[i].food + '\n'; 
            alert(ans); 
        }, 
    }, 
});

应用程序/模板/filterBy2.hbs


{{page-title "filterBy"}} 
<h3>List of Item in Buckets</h3> 
<table> 
    <tr> 
        <th> Food Name </th> 
        <th>Bucket </th> 
        <th>Fruit </th> 
      </tr> 
      {{#each @model as |website|}} 
    <tr> 
        <td>{{website.food}}</td> 
          <td>{{website.Bucket}}</td> 
          <td>{{website.isFruit}}</td> 
    </tr> 
      {{/each}} 
</table> 
<br /><br /> 
<input type="button" id="all-Fruits" 
    value="All Fruit" {{action "allFruit"}} /> 
<br /><br /> 
<input 
    type="button"
      id="BucketNo"
      value="All items except fruits"
      {{action "nonFruit"}} 
/> 
<br /><br /> 
<div> 
    <label>Enter Attribute Value: </label> 
      {{input value=this.temp2}} 
</div> 
<input 
    type="button"
      id="all-Fruits"
      value="All Fruit"
      {{action "Select" this.temp2}} 
/> 
{{outlet}}

输出：访问 localhost:4200/filterBy2 查看输出

Ember.js ArrayProxy filterBy 方法

参考：https://api.emberjs.com/ember/2.14/classes/Ember.Array/methods/filterBy?anchor=filterBy

相关用法

注：本文由纯净天空筛选整理自satyam00so大神的英文原创作品 Ember.js ArrayProxy filterBy() 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。