Ember.js MutableArray filterBy() 方法

Ember.js是一个开源的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是最广泛使用的前端应用程序框架之一。它被设计用于加速开发并提高生产力。目前，许多网站都使用Ember.js，包括Square、Discourse、Groupon、Linked In、Live Nation、Twitch和Chipotle。

filterBy() 方法 用于返回仅包含匹配属性的项的数组。

语法：

filterBy( key, value );

属性：

key： 它是用来与项目进行测试的属性。
value： 它是可选的值，用来与项目进行比较。

返回值： 它返回一个经过筛选的数组。

步骤1： 要运行以下示例，您需要一个 Ember 项目。首先需要安装 ember-cli。在终端中写入以下代码：

npm install ember-cli

现在，您可以通过输入以下代码片段来创建项目：

ember new <project-name> --lang en

步骤2： 要启动服务器，请输入：

ember serve

示例1

输入以下代码以生成此示例的路由：

ember generate route filterBy1

app/routes/filter-by1.js

import Route from '@ember/routing/route'; 
import { } from '@ember/array'; 
  
export default class FruitsRoute extends Route { 
    fruits = [ 
        { 
            name: 'Lady Finger', 
            isFruit: false, 
            color: 'green', 
        }, 
        { 
            name: 'Tomato', 
            isFruit: false, 
            color: 'red', 
        }, 
        { 
            name: 'Apple', 
            isFruit: true, 
            color: 'red', 
        }, 
        { 
            name: 'Potato', 
            isFruit: false, 
            color: 'brown', 
        }, 
        { 
            name: 'Mango', 
            isFruit: true, 
            color: 'yellow', 
        }, 
        { 
            name: 'Bannana', 
            isFruit: true, 
            color: 'yellow', 
        }, 
        { 
            name: 'Cabbage', 
            isFruit: false, 
            color: 'green', 
        }, 
        { 
            name: 'Orange', 
            isFruit: true, 
            color: 'orange', 
        }, 
    ]; 
    temp1; 
    temp2; 
    model() { 
        this.temp1 = this.fruits.filterBy('isFruit', false); 
        this.temp2 = this.fruits.filterBy('isFruit', true); 
  
        return this.fruits; 
    } 
    setupController(controller, model) { 
        super.setupController(controller, model); 
        controller.set('fruits', this.fruits); 
        controller.set('temp1', this.temp1); 
        controller.set('temp2', this.temp2); 
    } 
}

app/templates/filter-by1.hbs

{{page-title "filter-By"}} 
<table style="border: 2px solid black; 
    float : left;padding: 30px;"> 
    <div> 
        <h2>Vegebles List</h2> 
        <tr> 
            <th>Name</th> 
              <th>isFruit</th> 
             <th>color</th> 
        </tr> 
            {{#each this.temp1 as |i|}} 
                  <tr> 
                    <td>{{i.name}}</td> 
                    <td>{{i.isFruit}}</td> 
                    <td>{{i.color}}</td> 
                  </tr> 
            {{/each}} 
      </div> 
</table> 
<table style="border: 2px solid black; 
    float : left;padding: 30px;"> 
      <div> 
        <h2>Fruits List</h2> 
        <tr> 
              <th>Name</th> 
              <th>isFruit</th> 
              <th>color</th> 
        </tr> 
        {{#each this.temp2 as |i|}} 
        <tr> 
            <td>{{i.name}}</td> 
            <td>{{i.isFruit}}</td> 
            <td>{{i.color}}</td> 
          </tr> 
        {{/each}} 
      </div> 
</table> 
{{outlet}}

输出: 访问 localhost:4200/filterBy1 查看输出

Ember.js MutableArray filterBy() 方法

示例2

输入以下代码生成此示例的路由：

ember generate route filterBy2

app/routes/filter-by2.js

import Route from '@ember/routing/route'; 
  
export default class DetailsRoute extends Route { 
    details = [ 
        { 
            name: 'Anubhav', 
            city: 'Patna', 
            gender: 'M', 
            zipCode: '800020', 
        }, 
        { 
            name: 'Satyam', 
            city: 'Delhi', 
            gender: 'M', 
            zipCode: '110012', 
        }, 
        { 
            name: 'Shivam', 
            city: 'Patna', 
            gender: 'M', 
            zipCode: '530068', 
        }, 
        { 
            name: 'Ayushi', 
            city: 'Jaipur', 
            gender: 'F', 
            zipCode: '302001', 
        }, 
    ]; 
    attr = ['name', 'city', 'gender', 'zipCode']; 
    temp; 
    start; 
    end; 
    model() { 
        return this.details; 
    } 
    setupController(controller, model) { 
        super.setupController(controller, model); 
        controller.set('details', this.details); 
        controller.set('attr', this.attr); 
        controller.set('temp', this.temp); 
        controller.set('temp2', this.temp2); 
        controller.set('end', this.end); 
    } 
}

app/controllers/filter-by2.js

import Ember from 'ember'; 
  
export default Ember.Controller.extend({ 
    vehicle: null, 
    vehicles: Ember.String.w('Tesla Chrysler Toyota'), 
    actions: { 
        selectattr(temp) { 
            this.set('temp', temp); 
        }, 
        filter_Data(temp, temp2) { 
            console.log(temp, temp2); 
            let ans =  
                JSON.stringify(this.details.filterBy(temp, temp2)); 
            alert(ans); 
        }, 
    }, 
});

app/template/filter-by2.hbs

{{page-title "Details"}} 
<h3>List of People: </h3> 
<br /><br /> 
<table> 
    <tr> 
        <th>Name</th> 
        <th>Gender</th> 
        <th>City</th> 
        <th>Zip Code</th> 
      </tr> 
      {{#each @model as |detail|}} 
    <tr> 
          <td>{{detail.name}}</td> 
          <td>{{detail.gender}}</td> 
          <td>{{detail.city}}</td> 
          <td>{{detail.zipCode}}</td> 
    </tr> 
      {{/each}} 
</table> 
<br /> 
<div> 
    <label>Select Attribute: </label> 
    <select onchange={{action "selectattr" value="target.value"}}> 
        {{#each this.attr as |attribute|}} 
              <option value={{attribute}}>{{attribute}}</option> 
        {{/each}} 
      </select> 
</div> 
<br /> 
<div> 
    <label>Enter value for Attribute: </label> 
          {{input value=this.temp2}} 
</div> 
<div> 
    <input 
        type="button"
        id="check-fruit"
        value="Filter Data"
        {{action "filter_Data" this.temp this.temp2}} 
      /> 
</div> 
{{outlet}

输出： 访问 localhost:4200/filterBy2 查看输出

Ember.js MutableArray filterBy() 方法