Embeer.js EmberArray includes()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。

include() 方法用于检查传递的对象是否存在于数组中。

用法:

include( object, startAt )

参数：

object: 它是我们在数组中搜索的对象。
startAt:它是可选的搜索起始索引。

返回值：如果在数组中找到对象，则为 True。

安装步骤：

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 include1

应用程序/路线/include1.js


import Route from '@ember/routing/route'; 
import { classify, w } from '@ember/string'; 
  
export default class RichestPeopleRoute extends Route { 
    items = [ 
        'Lady Finger', 
        undefined, 
        'Tomato', 
        undefined, 
        'Apple', 
        'Potato', 
        null]; 
  
    someMoreDetails = [ 
        'Mango', 
        'Banana', 
        'Cabbage', 
        'Orange', 
    ]; 
    temp; 
    model() { 
        return this.items; 
    } 
    setupController(controller, model) { 
        super.setupController(controller, model); 
        controller.set('items', this.items); 
        controller.set('someMoreDetails',  
            this.someMoreDetails); 
        controller.set('item2', this.item2); 
        controller.set('temp', this.temp); 
    } 
}

应用程序/控制器/include1.js


import Ember from 'ember'; 
import { compact } from '@ember/array'; 
  
export default Ember.Controller.extend({ 
    actions: { 
        checkItem(data) { 
            let ans = this.items.includes(data); 
            alert(`${ans ? 'List contains item ' :  
                'List does not contains '}`); 
        }, 
        pushMoreDetails() { 
            this.items.pushObjects(this.someMoreDetails); 
        } 
    }, 
});

应用程序/模板/include1.hbs


{{page-title "EmberArray include"}} 
<table style=" border-spacing : 30px"> 
    <h2>Array with undefined and null</h2> 
      <ul> 
        {{#each @model as |i|}} 
              {{#if i}} 
                <li>{{i}}</li> 
              {{else}} 
                <li><b>undefined/null</b></li> 
              {{/if}} 
        {{/each}} 
    </ul> 
</table> 
{{#if this.flag}} 
    <h2>Array with undefined and null</h2> 
      <table> 
        <ul> 
              {{#each @model as |i|}} 
                {{#if i}} 
                      <li>{{i}}</li> 
                {{else}} 
                      <li><b>undefined/null</b></li> 
                {{/if}} 
              {{/each}} 
        </ul> 
    </table> 
{{/if}} 
<br /><br /> 
<div> 
    <label>Enter Item Name : </label> 
      {{input value=this.temp}} 
</div> 
<input 
    type="button"
      id="all-Fruits"
      value="Check In list"
      {{action "checkItem" this.temp}} 
/> 
<br /><br /> 
<input 
    type="button"
      id="push-details"
      value="Add More Details"
      {{action "pushMoreDetails"}} 
/> 
{{outlet}}

输出：访问 localhost:4200/include1 查看输出

Ember.js EmberArray 包含方法

示例 2：键入以下代码以生成本示例的路由：

ember generate route include2

应用程序/路线/include2.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/include2.js


import Ember from 'ember'; 
  
export default Ember.Controller.extend({ 
    actions: { 
        Selct1(data1) { 
            let temp = this.food.filterBy('Bucket', '1'); 
            let temp1 = temp.getEach('food') 
            let ans = temp1.includes(data1); 
            alert(`${ans ? 'it Contains' :  
                "It does not contains"}`); 
        }, 
  
        Selct2(data1) { 
            let temp = this.food.filterBy('Bucket', '2'); 
            let temp1 = temp.getEach('food') 
            let ans = temp1.includes(data1); 
            alert(`${ans ? 'it Contains' :  
                "It does not contains"}`); 
        }, 
        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/include2.hbs


{{page-title "Includes"}} 
<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 /> 
<div> 
    <label>Enter Item Name : </label> 
      {{input value=this.temp2}} 
</div> 
<input 
    type="button"
      id="get-item2"
      value="Check In Bucket 1"
      {{action "Selct1" this.temp2}} 
/> 
<input 
    type="button"
      id="get-item"
      value="Check In Bucket 2"
      {{action "Selct2" this.temp2}} 
/> 
{{outlet}}

输出：访问 localhost:4200/include2 查看输出

Ember.js EmberArray 包含方法

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

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 includes() 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。