Embeer.js EmberArray uniqBy()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。

uniqBy() 方法用于获取给定键具有唯一值的对象。

用法:

uniqBy(key)

参数：

key:获得独特值的关键。

返回值：给定键具有唯一值的数组。

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 details

应用程序/路线/details.js


import Route from '@ember/routing/route'; 
  
export default class DetailsRoute extends Route { 
    details = [ 
        { 
            name: 'Anubhav', 
            mobile: '1298119967', 
            city: 'Patna', 
            country: 'India', 
            gender: 'M', 
            zipCode: '800020', 
        }, 
        { 
            name: 'Sakshi', 
            mobile: '1234567890', 
            city: 'Mumbai', 
            country: 'India', 
            gender: 'F', 
            zipCode: '400001', 
        }, 
        { 
            name: 'Satyam', 
            mobile: '2222222222', 
            city: 'Delhi', 
            country: 'India', 
            gender: 'M', 
            zipCode: '110012', 
        }, 
        { 
            name: 'Shivam', 
            mobile: '1122113322', 
            city: 'Bangalore', 
            country: 'India', 
            gender: 'M', 
            zipCode: '530068', 
        }, 
        { 
            name: 'Ayushi', 
            mobile: '2244668800', 
            city: 'Jaipur', 
            country: 'India', 
            gender: 'F', 
            zipCode: '302001', 
        }, 
    ]; 
    someMoreDetails = [ 
        { 
            name: 'Yeshwant', 
            mobile: '1133557799', 
            city: 'Chennai', 
            country: 'India', 
            gender: 'M', 
            zipCode: '600001', 
        }, 
        { 
            name: 'Siddhant', 
            mobile: '9911000000', 
            city: 'Mangalore', 
            country: 'India', 
            gender: 'M', 
            zipCode: '574142', 
        }, 
        { 
            name: 'Khushi', 
            mobile: '8888888888', 
            city: 'Pune', 
            country: 'India', 
            gender: 'F', 
            zipCode: '111045', 
        }, 
    ]; 
    start; 
    end; 
    idx; 
    model() { 
        return this.details; 
    } 
    setupController(controller, model) { 
        super.setupController(controller, model); 
        controller.set('details', this.details); 
        controller.set('someMoreDetails', 
            this.someMoreDetails); 
        controller.set('start', this.start); 
        controller.set('end', this.end); 
        controller.set('idx', this.idx); 
    } 
}

应用程序/控制器/details.js


import Ember from 'ember'; 
import { removeAt, unshiftObjects, objectAt, uniqBy, find } 
    from '@ember/array'; 
  
export default Ember.Controller.extend({ 
    actions: { 
        removeDetails(start, end) { 
            this.details.removeAt(start, end); 
        }, 
        addMoreDetails() { 
            this.details.unshiftObjects(this.someMoreDetails); 
        }, 
        getDetail(index) { 
            let foo = this.details.objectAt(index); 
            alert(foo.name); 
        }, 
        getFirstMaleAndFemalePerson() { 
            let foo = this.details.uniqBy('gender').toArray(); 
            let str = ""; 
            for (let i = 0; i < foo.length; i++) 
                str += foo[i].name + "\n"; 
            alert(str); 
        }, 
        getFirstMale() { 
            let foo = this.details.find((detail) => 
                detail.gender === 'M'); 
            alert(foo.name); 
        }, 
    }, 
});

应用程序/模板/details.hbs


{{page-title "Details"}} 
<h3>List of People: </h3> 
<br /><br /> 
<table> 
    <tr> 
        <th>Name</th> 
        <th>Gender</th> 
        <th>Mobile</th> 
        <th>City</th> 
        <th>Country</th> 
        <th>Zip Code</th> 
      </tr> 
        {{#each @model as |detail|}} 
    <tr> 
        <td>{{detail.name}}</td> 
          <td>{{detail.gender}}</td> 
          <td>{{detail.mobile}}</td> 
          <td>{{detail.city}}</td> 
          <td>{{detail.country}}</td> 
          <td>{{detail.zipCode}}</td> 
    </tr> 
      {{/each}} 
</table> 
<br /><br /> 
<div> 
    <label>Enter Start Index: </label> 
      {{input value=this.start}} 
</div> 
<div> 
    <label>Enter End Index: </label> 
      {{input value=this.end}} 
</div> 
<div> 
    <input
        type="button"
        id="remove-details"
        value="Remove Details"
        {{action "removeDetails" this.start this.end}} 
      /> 
</div> 
<br /><br /> 
<div> 
    <label>Enter Index: </label> 
      {{input value=this.idx}} 
</div> 
<div> 
    <input
        type="button"
        id="get-detail"
        value="Get detail"
        {{action "getDetail" this.idx}} 
      /> 
</div> 
<br /><br /> 
<input
    type="button"
      id="add-details"
      value="Add More Details"
      {{action "addMoreDetails"}} 
/> 
<br /><br /> 
<input
    type="button"
      id="all-male"
      value="Get First Male"
      {{action "getFirstMale"}} 
/> 
<br /><br /> 
<input
    type="button"
      id="get"
      value="Get"
      {{action "getFirstMaleAndFemalePerson"}} 
/> 
{{outlet}}

输出：访问 localhost:4200/details 查看输出

示例 2：键入以下代码以生成本示例的路由：

ember generate route websites

应用程序/路线/websites.js


import Route from '@ember/routing/route'; 
  
export default class WebsitesRoute extends Route { 
    websites = [ 
        { 
            name: 'Wikipedia', 
            link: 'www.wikipedia.com', 
        }, 
        { 
            name: 'Facebook', 
            link: 'www.facebook.com', 
        }, 
        { 
            name: 'Google', 
            link: 'www.google.com', 
        }, 
        { 
            name: 'Twitter', 
            link: 'www.twitter.com', 
        }, 
    ]; 
    moreWebsites = [ 
        { 
            name: 'Google', 
            link: 'www.google.com', 
        }, 
        { 
            name: 'Amazon', 
            link: 'www.amazon.com', 
        }, 
    ]; 
    model() { 
        return this.websites; 
    } 
    setupController(controller, model) { 
        super.setupController(controller, model); 
        controller.set('websites', this.websites); 
        controller.set('moreWebsites', this.moreWebsites); 
    } 
}

应用程序/控制器/websites.js


import Ember from 'ember'; 
import { pushObjects, setEach } from '@ember/array'; 
  
export default Ember.Controller.extend({ 
    actions: { 
        add() { 
            this.websites.pushObjects(this.moreWebsites); 
        }, 
        getUnique() { 
            let foo = this.websites.uniqBy('name').toArray(); 
            let str = ""; 
            for (let i = 0; i < foo.length; i++) 
                str += foo[i].name + "\n"; 
            alert(str); 
        } 
    }, 
});

应用程序/模板/websites.hbs


{{page-title "Websites"}} 
<h3>Websites</h3> 
<br /><br /> 
<table> 
      <tr> 
        <th>Name</th> 
        <th>Website Link</th> 
      </tr> 
      {{#each @model as |website|}} 
    <tr> 
        <td>{{website.name}}</td> 
          <td>{{website.link}}</td> 
    </tr> 
      {{/each}} 
</table> 
<br /><br /> 
<input type="button" id="add-website" 
    value="More Websites" {{action "add"}} /> 
<br /><br /> 
<input
    type="button"
      id="get-website"
      value="Click Here"
      {{action "getUnique"}} 
/> 
{{outlet}}

输出：访问 localhost:4200/websites 查看输出

参考： https://api.emberjs.com/ember/4.6/classes/EmberArray/methods/

相关用法

注：本文由纯净天空筛选整理自aayushmohansinha大神的英文原创作品 Ember.js EmberArray uniqBy() 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。