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Embeer.js ArrayProxy find()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。

find() 方法用於獲取第一個針對回調函數返回 true 的項目。

用法:

find ( callback, target );

參數：

  • callback:它是檢查列表中項目的回調函數。
  • target: 這是我們測試回調函數的項目。

返回值：找到項目或未定義。

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 find1

應用程序/路線/find1.js


import Route from '@ember/routing/route'; 
  
export default class DetailsRoute 
    extends Route { 
    details = [ 
        { 
            name: 'Aaksh', 
            mobile: '9811129967', 
            city: 'Delhi', 
            country: 'India', 
            gender: 'M', 
            zipCode: '800020', 
        }, 
        { 
            name: 'Sweta', 
            mobile: '9456712890', 
            city: 'Mumbai', 
            country: 'India', 
            gender: 'F', 
            zipCode: '400001', 
        }, 
        { 
            name: 'Satyam', 
            mobile: '2222222222', 
            city: 'Raipur', 
            country: 'India', 
            gender: 'M', 
            zipCode: '110012', 
        }, 
        { 
            name: 'Shandya', 
            mobile: '1122113322', 
            city: 'Bangalore', 
            country: 'India', 
            gender: 'F', 
            zipCode: '530068', 
        }, 
        { 
            name: 'Ayushi', 
            mobile: '2244668800', 
            city: 'Thana', 
            country: 'India', 
            gender: 'F', 
            zipCode: '302001', 
        }, 
    ]; 
    city; 
    name; 
    code; 
    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('code', this.code); 
        controller.set('name', this.name); 
    } 
}

應用程序/控製器/find1.js


import Ember from 'ember'; 
import { find } 
    from '@ember/array'; 
  
export default Ember.Controller.extend({ 
    actions: { 
        findCity(city) { 
            let foo = this.details.find((person) => 
            person.city == this.city); 
            foo ? alert(`${foo.name}  is from ${city} `) : 
            alert(`No one from ${city}`); 
        }, 
        findName(name) { 
            let foo = this.details.find((person) => 
            person.name == this.name); 
            foo ? alert(`${name}  is from ${foo.city} `) : 
            alert(`No By name ${name}`); 
        }, 
        findCode(code) { 
            let foo = this.details.find((person) => 
            person.zipCode == this.code); 
            foo ? alert(`${foo.name}  is from ${code} `) : 
            alert(`No one from ${code}`); 
        }, 
    }, 
});

應用程序/模板/find1.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="find-city"
        value="Find Someone By City"
        {{action "findCity" this.city}} 
      /> 
</div> 
<br /><br /> 
<div> 
    <label>Enter Name: </label> 
      {{input value=this.name}} 
</div> 
<div> 
    <input 
        type="button"
        id="find-name"
        value="Find Someone by Name"
        {{action "findName" this.name}} 
      /> 
</div> 
<br /><br /> 
<div> 
    <label>Enter Zip: </label> 
      {{input value=this.code}} 
</div> 
<div> 
    <input 
        type="button"
        id="find-code"
        value="Find Someone By zipCode"
        {{action "findCode" this.code}} 
      /> 
</div> 
{{outlet}}

輸出：訪問 localhost:4200/find1 查看輸出

Ember.js ArrayProxy查找方法

示例 2：鍵入以下代碼以生成本示例的路由：

ember generate route find2

應用程序/路線/find2.js


import Route from '@ember/routing/route'; 
  
export default class StudentsRoute extends Route { 
    students = [ 
        { 
            name: 'Aakash', 
            gender: 'M', 
            class: 10, 
            grade: 'A', 
        }, 
        { 
            name: 'Soniya', 
            gender: 'F', 
            class: 8, 
            grade: 'C', 
        }, 
        { 
            name: 'Sita', 
            gender: 'F', 
            class: 10, 
            grade: 'A', 
        }, 
        { 
            name: 'Ram', 
            gender: 'M', 
            class: 10, 
            grade: 'A', 
        }, 
        { 
            name: 'Esnoor', 
            gender: 'M', 
            class: 9, 
            grade: 'C', 
        }, 
        { 
            name: 'Isha', 
            gender: 'F', 
            class: 19, 
            grade: 'B', 
        }, 
        { 
            name: 'Doman', 
            gender: 'M', 
            class: 12, 
            grade: 'B', 
        }, 
        { 
            name: 'Lolu', 
            gender: 'M', 
            class: 10, 
            grade: 'A', 
        }, 
        { 
            name: 'Lucky', 
            gender: 'M', 
            class: 11, 
            grade: 'F', 
        }, 
        { 
            name: 'Neha', 
            gender: 'F', 
            class: 10, 
            grade: 'B', 
        }, 
        { 
            name: 'Balit', 
            gender: 'M', 
            class: 12, 
            grade: 'F', 
        }, 
        { 
            name: 'Hillier Buchanan', 
            gender: 'M', 
            class: 12, 
            grade: 'A', 
        }, 
        { 
            name: 'Aman', 
            gender: 'M', 
            class: 11, 
            grade: 'B', 
        }, 
        { 
            name: 'Anuj', 
            gender: 'M', 
            class: 12, 
            grade: 'F', 
        }, 
        { 
            name: 'Satyam', 
            gender: 'M', 
            class: 12, 
            grade: 'F', 
        }, 
        { 
            name: 'Aayush', 
            gender: 'M', 
            class: 12, 
            grade: 'C', 
        }, 
    ]; 
    temp2; 
    model() { 
        return this.students; 
    } 
    setupController(controller, model) { 
        super.setupController(controller, model); 
        controller.set('students', this.students); 
        controller.set('temp2', this.temp2); 
    } 
}

應用程序/控製器/find2.js


import Ember from "ember"; 
import { map, clear } from "@ember/array"; 
  
export default Ember.Controller.extend({ 
    actions: { 
  
        findName(name) { 
            let temp = this.students.find((item) => 
            item.name == name); 
            alert(temp ? `${name} is from ${temp.class} Class 
            ` : `No one by name ${name}`); 
        }, 
        findClass(clas) { 
            let temp = this.students.find((item) => 
            item.class == clas); 
            alert(temp ? `${temp.name} is first Student 
            from ${clas}` : `No one from class ${clas}`); 
        }, 
        Remove() { 
            this.students.clear(); 
  
        }, 
    } 
});

應用程序/模板/find2.hbs


{{page-title "Students"}} 
<h3>List of Students: </h3> 
<br /><br /> 
<table> 
    <tr> 
        <th>Name</th> 
        <th>Class</th> 
        <th>Gender</th> 
        <th>Grade</th> 
      </tr> 
      {{#each @model as |student|}} 
    <tr> 
          <td>{{student.name}}</td> 
          <td>{{student.class}}</td> 
          <td>{{student.gender}}</td> 
          <td>{{student.grade}}</td> 
    </tr> 
      {{/each}} 
</table> 
<br /><br /> 
<div> 
    <label>Enter Class: </label> 
      {{input value=this.temp}} 
</div> 
<br /> 
<input 
    type="button"
      id="find-class"
      value="Find First student of class"
      {{action "findClass" this.temp}} 
/> 
<br /><br /> 
<div> 
    <label>Enter Name: </label> 
      {{input value=this.temp2}} 
</div> 
<br /> 
<input 
    type="button"
      id="find-name"
      value="Find Person"
      {{action "findName" this.temp2}} 
/> 
<br /><br /> 
<input 
    type="button"
      id="Remove"
      value="Delate ALL"
      {{action "Remove" this.temp2}} 
/> 
{{outlet}}

輸出：訪問 localhost:4200/find2 查看輸出

Ember.js ProxyArray查找方法

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



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 find() 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。