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Embeer.js EmberArray 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: 这是我们必须测试的属性名称。
  • value: 这是我们必须测试的属性的值。

返回值：过滤后的数组。

安装和运行 Ember.js 的步骤：

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 filter-by1

应用程序/路线/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); 
    } 
}

应用程序/控制器/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); 
        }, 
    }, 
});

应用程序/模板/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 查看输出

Ember.js EmberArray filterBy 方法

示例 2：键入以下代码以生成本示例的路由：

ember generate route filter-by2

应用程序/路线/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); 
    } 
}

应用程序/控制器/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}`); 
            } 
        }, 
    }, 
});

应用程序/模板/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}}

输出：访问 localhost:4200/filter-by2 查看输出

Ember.js EmberArray filterBy 方法

参考：https://api.emberjs.com/ember/4.6/classes/EmberArray/methods/filter?anchor=filterBy



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 EmberArray 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。