Ember.js EmberArray filterBy() 方法

Ember.js 是一个基于模型-视图-控制器（MVC）架构用于开发大型客户端Web应用程序的开源JavaScript框架。Ember.js是最广泛使用的前端应用程序框架之一。它旨在加快开发速度并提高生产力。目前，许多网站都在使用它，包括Square、Discourse、Groupon、领英、Live Nation、Twitch和Chipotle等。

filterBy() 方法用于按属性和可选值过滤数组。

语法：

filterBy( key, value );

参数：

key： 这是我们要测试的属性名称。
value： 这是我们要测试的属性的值。

返回值： 过滤后的数组。

安装和运行Ember.js的步骤：

步骤1： 要运行以下示例，您需要先有一个Ember项目。要创建一个项目，您需要首先安装ember-cli。在终端中输入以下代码：

npm install ember-cli

步骤2： 现在您可以通过输入以下代码来创建项目：

ember new <project-name> --lang en

开始服务器，请键入：

ember serve

示例1

输入以下代码以生成此示例的路径：

ember generate route filter-by1

app/routes/filter-by1.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); 
    } 
}

app/controllers/filter-by1.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); 
        }, 
    }, 
});

app/templates/filter-by1.hbs

{{page-title "filterBy"}} 
<h3>Websites</h3> 
<br /><br /> 
<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 Bucket Number : </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/filter-by1 查看结果

Ember.js EmberArray filterBy() 方法

示例2

输入以下代码以生成此示例的路线：

ember generate route filter-by2

app/routes/filter-by2.js

import Route from '@ember/routing/route'; 
  
export default class StudentsRoute extends Route { 
    students = [ 
        { 
            name: 'Aakash', 
            gender: 'M', 
            class: 10, 
            grade: 'A', 
        }, 
        { 
            name: 'Soniya', 
            gender: 'F', 
            class: 8, 
            grade: 'C', 
        }, 
        { 
            name: 'Sita', 
            gender: 'F', 
            class: 10, 
            grade: 'A', 
        }, 
        { 
            name: 'Ram', 
            gender: 'M', 
            class: 10, 
            grade: 'A', 
        }, 
        { 
            name: 'Esnoor', 
            gender: 'M', 
            class: 9, 
            grade: 'C', 
        }, 
        { 
            name: 'Isha', 
            gender: 'F', 
            class: 19, 
            grade: 'B', 
        }, 
        { 
            name: 'Doman', 
            gender: 'M', 
            class: 12, 
            grade: 'B', 
        }, 
        { 
            name: 'Lolu', 
            gender: 'M', 
            class: 10, 
            grade: 'A', 
        }, 
        { 
            name: 'Lucky', 
            gender: 'M', 
            class: 11, 
            grade: 'F', 
        }, 
        { 
            name: 'Neha', 
            gender: 'F', 
            class: 10, 
            grade: 'B', 
        }, 
        { 
            name: 'Balit', 
            gender: 'M', 
            class: 12, 
            grade: 'F', 
        }, 
        { 
            name: 'Hillier Buchanan', 
            gender: 'M', 
            class: 12, 
            grade: 'A', 
        }, 
        { 
            name: 'Aman', 
            gender: 'M', 
            class: 11, 
            grade: 'B', 
        }, 
        { 
            name: 'Anuj', 
            gender: 'M', 
            class: 12, 
            grade: 'F', 
        }, 
        { 
            name: 'Satyam', 
            gender: 'M', 
            class: 12, 
            grade: 'F', 
        }, 
        { 
            name: 'Aayush', 
            gender: 'M', 
            class: 12, 
            grade: 'C', 
        }, 
    ]; 
    temp2; 
    model() { 
        return this.students; 
    } 
    setupController(controller, model) { 
        super.setupController(controller, model); 
        controller.set('students', this.students); 
        controller.set('temp2', this.temp2); 
    } 
}

app/controllers/filter-by2.js

import Ember from 'ember'; 
  
export default Ember.Controller.extend({ 
    actions: { 
        allPass() { 
            let temp = this.students. 
             filterBy('grade', 'F'); 
            let ans = ''; 
            for (let i = 0; i < temp.length; i++) 
                ans += temp[i].name + '\n'; 
            alert(ans); 
        }, 
        allFemale() { 
            let temp = this.students. 
             filterBy('gender', 'F'); 
            let ans = ''; 
            for (let i = 0; i < temp.length; i++) 
                ans += temp[i].name + '\n'; 
            alert(ans); 
        }, 
        allClass() { 
            let temp = this.students. 
            filterBy('class', 
                JSON.parse(this.temp2)); 
            let ans = ''; 
            for (let i = 0; i < temp.length; i++) 
                ans += temp[i].name + '\n'; 
            if (temp.length) { 
                alert(`Students from  
                 class {this.temp2}  
           are : \n{ans}`); 
            } else { 
                alert(`No student are 
                 from class ${this.temp2}`); 
            } 
        }, 
    }, 
});

app/templates/filter-by2.hbs

{{page-title "Students"}} 
<h3>List of Students: </h3> 
<br /><br /> 
<table> 
    <tr> 
        <th>Name</th> 
        <th>Class</th> 
        <th>Gender</th> 
        <th>Grade</th> 
    </tr> 
    {{#each @model as |student|}} 
        <tr> 
            <td>{{student.name}}</td> 
            <td>{{student.class}}</td> 
            <td>{{student.gender}}</td> 
            <td>{{student.grade}}</td> 
        </tr> 
    {{/each}} 
</table> 
<br /> 
<input 
    type="button"
    id="all-pass"
    value="Failed Student"
    {{action "allPass"}} 
/> 
<br /><br /> 
<input 
    type="button"
    id="all-female"
    value="All are Female"
    {{action "allFemale"}} 
/> 
<br /><br /> 
<div> 
    <label>Enter Class: </label> 
    {{input value=this.temp2}} 
</div> 
<br /> 
<input 
    type="button"
    id="all-class"
    value="All are in Same class"
    {{action "allClass" this.temp2}} 
/> 
{{outlet}}