Embeer.js ArrayProxy filterBy()用法及代碼示例

Ember.js 是一個開源 JavaScript 框架，用於開發基於 Model-View-Controller (MVC) 架構的大型客戶端 Web 應用程序。 Ember.js是使用最廣泛的前端應用框架之一。它的目的是加速開發並提高生產力。目前，它被大量網站使用，包括 Square、Discourse、Groupon、Linked In、Live Nation、Twitch 和 Chipotle。

filterBy() 方法用於按屬性和可選值過濾數組。

用法:

filterBy( key, value );

參數：

key: 它是我們想要其值的屬性的名稱。
value: 它是針對要檢查的鍵的值。

返回值：過濾後的數組。

安裝和運行 Ember.js 的步驟：

第 1 步：要運行以下示例，您需要有一個 ember 項目。要創建一個，您需要先安裝ember-cli。在終端中寫入以下代碼：

npm install ember-cli

第 2 步：現在您可以通過輸入以下代碼來創建項目：

ember new <project-name> --lang en

要啟動服務器，請鍵入：

ember serve

示例 1：鍵入以下代碼以生成本示例的路由：

ember generate route filterBy1

應用程序/路線/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); 
    } 
}

應用程序/控製器/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); 
        }, 
    }, 
});

應用程序/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}}

輸出：訪問 localhost:4200/filterBy1 查看輸出

Ember.js ArrayProxy filterBy 方法

示例 2：鍵入以下代碼以生成本示例的路由：

ember generate route filterBy2

應用程序/路線/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); 
    } 
}

應用程序/控製器/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); 
        }, 
    }, 
});

應用程序/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}}

輸出：訪問 localhost:4200/filterBy2 查看輸出

Ember.js ArrayProxy filterBy 方法

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

相關用法

注：本文由純淨天空篩選整理自satyam00so大神的英文原創作品 Ember.js ArrayProxy filterBy() Method。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。