Embeer.js Component decrementProperty()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。

當屬性的值需要減少到一定數量時，使用decrementProperty()方法。

用法:

decrementProperty( keyName, decrement );

參數：

keyName: 它是要遞減的屬性。
decrement: 它是要減少的值。默認值為 1。

返回值：此方法返回一個新的屬性值。

安裝和運行 Ember.js 的步驟：

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 decrement1

應用程序/組件/temp.js

Javascript


import Component from '@glimmer/component'; 
import { tracked } from '@glimmer/tracking'; 
import { action, incrementProperty, defineProperty } 
    from '@ember/object'; 
import EmberObject from '@ember/object'; 
  
export default class extends Component { 
    @tracked 
    details = [ 
        EmberObject.create({ 
            name: 'Wilow Lingwood', 
            gender: 'F', 
            class: 8, 
            grade: 'A', 
            pocket_money: 4279, 
        }), 
        EmberObject.create({ 
            name: 'Estele MacIllrick', 
            gender: 'M', 
            class: 9, 
            grade: 'E', 
            pocket_money: 2579, 
        }), 
        EmberObject.create({ 
            name: 'Israel Blackaller', 
            gender: 'M', 
            class: 10, 
            grade: 'A', 
            pocket_money: 9381, 
        }), 
        EmberObject.create({ 
            name: 'Doralyn Sowerbutts', 
            gender: 'F', 
            class: 12, 
            grade: 'A', 
            pocket_money: 4933, 
        }), 
        EmberObject.create({ 
            name: 'Lolly Boynes', 
            gender: 'F', 
            class: 8, 
            grade: 'A', 
            pocket_money: 1988, 
        }), 
        EmberObject.create({ 
            name: 'Lucie Janowski', 
            gender: 'F', 
            class: 11, 
            grade: 'F', 
            pocket_money: 6185, 
        }), 
        EmberObject.create({ 
            name: 'Celene Enticknap', 
            gender: 'F', 
            class: 9, 
            grade: 'A', 
            pocket_money: 7186, 
        }), 
        EmberObject.create({ 
            name: 'Hillier Buchanan', 
            gender: 'M', 
            class: 12, 
            grade: 'A', 
            pocket_money: 844, 
        }), 
        EmberObject.create({ 
            name: 'Flint Chesley', 
            gender: 'M', 
            class: 9, 
            grade: 'B', 
            pocket_money: 3835, 
        }), 
    ]; 
  
    decrement() { 
        this.details.forEach( 
            (value) => value.decrementProperty( 
                'pocket_money', 100) 
        ); 
    } 
}

應用程序/組件/temp.hbs

HTML


{{page-title "Component decrementProperty"}} 
<h3>List of Students: </h3> 
<table> 
    <tr> 
        <th>Name</th> 
        <th>Class</th> 
        <th>Gender</th> 
        <th>Grade</th> 
        <th>Pocket Money</th> 
    </tr> 
    {{#each this.details as |detail|}} 
        <tr> 
            <td>{{detail.name}}</td> 
            <td>{{detail.gender}}</td> 
            <td>{{detail.class}}</td> 
            <td>{{detail.grade}}</td> 
            <td>{{detail.pocket_money}}</td> 
        </tr> 
    {{/each}} 
</table> 
<br /><br /> 
<input
    type="button"
    id="lower-all"
    value="Lower the Pokcet money by 100"
    {{action "decrement"}} 
/>

應用程序/模板/decrement1.hbs

HTML


<Arr>decrementProperty Example</Arr>

輸出：

減量屬性輸出1

示例 2：鍵入以下代碼以生成本示例的路由：

ember generate route decrement2

應用程序/組件/test.js

Javascript


import Component from '@glimmer/component'; 
import { tracked } from '@glimmer/tracking'; 
import { action, incrementProperty, defineProperty }  
    from '@ember/object'; 
import EmberObject from '@ember/object'; 
  
const Food = EmberObject.extend({ 
    toStringExtension() { 
        return this.get('food'); 
    } 
}); 
  
export default class extends Component { 
    @tracked 
    details = [ 
        EmberObject.create({ 
            name: 'Mohan', 
            age: 20, 
            salary: 10000, 
            city: 'Patna', 
            gender: 'M', 
        }), 
        EmberObject.create({ 
            name: 'Sonam', 
            age: 17, 
            salary: 2000, 
            city: 'Mumbai', 
            gender: 'F', 
        }), 
        EmberObject.create({ 
            name: 'Satyam', 
            age: 42, 
            salary: 230000, 
            city: 'Delhi', 
            gender: 'M', 
        }), 
        EmberObject.create({ 
            name: 'Shivam', 
            age: 33, 
            salary: 122200, 
            city: 'Patna', 
            gender: 'M', 
        }), 
        EmberObject.create({ 
            name: 'Ayushi', 
            age: 11, 
            salary: 100, 
            city: 'Jaipur', 
            gender: 'F', 
        }), 
        EmberObject.create({ 
            name: 'Yeshwant', 
            age: 19, 
            salary: 5000, 
            city: 'Chennai', 
            gender: 'M', 
        }), 
        EmberObject.create({ 
            name: 'Siddhant', 
            age: 65, 
            salary: 992130, 
            city: 'Mangalore', 
            gender: 'M', 
        }), 
        EmberObject.create({ 
            name: 'Khushi', 
            age: 10, 
            salary: 230390, 
            city: 'Pune', 
            gender: 'F', 
        }), 
    ]; 
  
    decrement() { 
        this.details.forEach( 
            (value) => value.decrementProperty( 
                'salary', 1000) 
        ); 
    } 
}

應用程序/組件/test.hbs

HTML


{{page-title "Component decrementProperty"}} 
<h3>List of People: </h3> 
<br /> 
<table> 
    <tr> 
        <th>Name</th> 
        <th>Gender</th> 
        <th>Age</th> 
        <th>Salary</th> 
        <th>City</th> 
    </tr> 
    {{#each this.details as |detail|}} 
        <tr> 
            <td>{{detail.name}}</td> 
            <td>{{detail.gender}}</td> 
            <td>{{detail.age}}</td> 
            <td>{{detail.salary}}</td> 
            <td>{{detail.city}}</td> 
        </tr> 
    {{/each}} 
</table> 
<br /><br /> 
<input
    type="button"
    id="get-all"
    value="Lower Salary of All By 1000"
    {{action "decrement"}} 
/>

應用程序/模板/減量.hbs

HTML


<Arr2> 
    DecrementProperty Example 
</Arr2>

輸出：

減量屬性輸出2

參考：https://api.emberjs.com/ember/4.4/classes/Component/methods/decrementProperty?anchor=decrementProperty

相關用法

注：本文由純淨天空篩選整理自nickgulshan大神的英文原創作品 Ember.js Component decrementProperty() 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。