Ember.js MutableArray rejectBy() 方法

Ember.js 是一个开源的 JavaScript 框架，用于开发基于模型-视图-控制器（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。它旨在加快开发速度并提高生产力。目前，许多网站都在使用它，包括 Square、Discourse、Groupon、Linked In、Live Nation、Twitch 和 Chipotle。

rejectBy() 方法返回一个包含给定键值为假的对象的数组。

语法：

rejectBy(key,value)

参数：

key： 要测试的属性。
value： 可选值，用于检查。

返回值： 新数组。

要运行以下示例，您将需要一个 Ember 项目。要创建一个项目，您需要首先安装 ember-cli。在终端中写入以下代码：

npm install ember-cli

现在，您可以通过键入以下代码片段来创建项目：

ember new <project-name> --lang en

要启动服务器，请键入：

ember serve

示例1

输入以下代码以生成此示例的路由：

ember generate route details

app/routes/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: "Patna", 
      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", 
    }, 
  ]; 
  city; 
  start; 
  end; 
  model() { 
    return this.details; 
  } 
  setupController(controller, model) { 
    super.setupController(controller, model); 
    controller.set("details", this.details); 
    controller.set("someMoreDetails", this.someMoreDetails); 
    controller.set("city", this.city); 
    controller.set("start", this.start); 
    controller.set("end", this.end); 
  } 
}

app/controllers/details.js

import Ember from "ember"; 
import { any, slice, reverseObjects, rejectBy } from "@ember/array"; 
  
export default Ember.Controller.extend({ 
  actions: { 
    checkCity(city) { 
      let res = this.details.any((person) => person.city == city); 
      alert(`Present: ${res ? "YES" : "NO"}`); 
    }, 
    sliceItems(start, end) { 
      let tempItems = this.details.slice(start, end); 
      let str = ""; 
      for (let i = 0; i < tempItems.length; i++) 
        str += tempItems[i].name + "\n"; 
      alert(str); 
    }, 
    reverse() { 
      this.set("details", this.details.reverseObjects()); 
    }, 
    getFemale() { 
      let tempItems = this.details.rejectBy("gender", "M"); 
      let str = ""; 
      for (let i = 0; i < tempItems.length; i++) 
        str += tempItems[i].name + "\n"; 
      alert(str); 
    }, 
    pushMoreDetails() { 
      this.details.pushObjects(this.someMoreDetails); 
    }, 
  }, 
});

app/template/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 City: </label> 
    {{input value=this.city}} 
</div> 
<div> 
    <input type="button" id="check-city" 
           value="Check" 
           {{action 'checkCity' this.city}} /> 
</div> 
<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="slice-items" 
           value="Slice Items"
           {{action 'sliceItems' this.start this.end}} /> 
</div> 
<br /><br /> 
<input type="button" id="push-details" 
       value="Add More Details" 
       {{action 'pushMoreDetails' }} /> 
<br /><br /> 
<input type="button" id="reverse" 
       value="Reverse" 
       {{action 'reverse' }} /> 
<br /><br /> 
<input type="button" id="get-female" 
       value="Get Female" 
       {{action 'getFemale' }} />

输出： 访问localhost:4200/details以查看输出结果

Ember.js MutableArray rejectBy() 方法

示例2

键入以下代码以生成此示例的路由：

ember generate route richest-people

app/routes/richest-people.js

import Route from "@ember/routing/route"; 
import { sortBy } from "@ember/array"; 
  
export default class RichestPeopleRoute extends Route { 
    richestPeople = [ 
        { name: "mukesh ambani", netWorth: 90.7, isFamily: false }, 
        { name: "jeff Bezos", netWorth: 148.1, isFamily: false }, 
        { name: "Warren Buffet", netWorth: 99.3, isFamily: false }, 
        { name: "Bill gates", netWorth: 104.7, isFamily: false }, 
        { name: "elon Musk", netWorth: 253.4, isFamily: false }, 
        { name: "gautam adani and family", netWorth: 115.8, isFamily: true }, 
        { name: "Larry Page", netWorth: 93.4, isFamily: false }, 
        { name: "larryEllison", netWorth: 103.3, isFamily: false }, 
        { name: "sergeyBrin", netWorth: 89.9, isFamily: false }, 
        { name: "bernard Arnault and family", netWorth: 157.1, isFamily: true }, 
    ]; 
    firstPerson; 
    lastPerson; 
    idx = 5; 
    randomPerson; 
    num; 
    model() { 
        this.richestPeople = this.richestPeople.sortBy("netWorth"); 
        this.randomPerson = this.richestPeople[this.idx - 1]; 
        return this.richestPeople; 
    } 
    setupController(controller, model) { 
        super.setupController(controller, model); 
        controller.set("idx", this.idx); 
        controller.set("firstPerson", this.richestPeople.firstObject); 
        controller.set("lastPerson", this.richestPeople.lastObject); 
        controller.set("randomPerson", this.randomPerson); 
        controller.set("richestPeople", this.richestPeople); 
        controller.set("num", this.richestPeople.length); 
    } 
}

app/controllers/richest-people.js

import Ember from "ember"; 
  
export default Ember.Controller.extend({ 
    actions: { 
        check(num) { 
            num = parseFloat(num); 
            let res = this.richestPeople.any( 
                (person) => person.netWorth >= num); 
            alert(`${res ? "YES" : "NO"}`); 
        }, 
        getFamilyBusiness() { 
            let tempItems = this.richestPeople 
                .rejectBy("isFamily", false); 
            let str = ""; 
            for (let i = 0; i < tempItems.length; i++) 
                str += tempItems[i].name + "\n"; 
            alert(str); 
        }, 
    }, 
});

app/template/richest-people.hbs

{ { page - title "Richest People" } } 
<h2>Richest People in the World</h2> 
<table style="border: 2px solid black;padding: 30px;"> 
    <tr> 
        <th>Name</th> 
        <th>Net Worth (in billions $)</th> 
    </tr> 
    {{#each @model as |person|}} 
    <tr> 
        <td>{{person.name}}</td> 
        <td>{{person.netWorth}}</td> 
    </tr> 
    {{/each}} 
</table> 
<br/><br/> 
<div> 
    <label>Enter Value: </label> 
    {{input value=this.num}} 
</div> 
<div> 
    <input type="button" id="check" 
           value="Contains Person With More Net Worth" 
          {{action 'check' this.num}}/> 
</div> 
  
<br/><br/> 
<input type="button" id="get-family" 
       value="Get Family Business"
       {{action 'getFamilyBusiness'}}/> 
{{outlet}}

输出： 访问 localhost:4200/richest-people 查看输出：

Ember.js MutableArray rejectBy() 方法