Embeer.js Ember.NativeArray 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。

decrementProperty() 方法用於將屬性設置為當前值減去某個值。

用法:

decrementProperty( keyName, decrement );

參數：

keyName: 這是我們想要減少其值的屬性的名稱。
decrement: 這是要減少的量。默認值為 1。

返回值：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/路線/decrement1.js

Javascript


import Route from '@ember/routing/route';
export default class WebsitesRoute extends Route {
    food = [
        {
            food: 'apple',
            isFruit: true,
            quant: '1',
        },
        {
            food: 'Potato',
            isFruit: false,
            quant: '2',
        },
        {
            food: 'Banana',
            isFruit: true,
            quant: '1',
        },
        {
            food: 'Burgur',
            isFruit: false,
            quant: '2',
        },
        {
            food: 'Orange',
            isFruit: true,
            quant: '1',
        },
        {
            food: 'sandwitch',
            isFruit: false,
            quant: '2',
        },
        {
            food: 'bean',
            isFruit: false,
            quant: '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);
    }
}

應用程序/控製器/decrement1.js

Javascript


import Ember from 'ember';
export default Ember.Controller.extend({
    value: 0,
    actions: {
        older() {
            this.incrementProperty('value');
        },
        younger() {
            this.decrementProperty('value');
        },
        addItem(data, data1, data2) {
            let temp = { 
                food: data, 
                quant: data1, 
                isFruit: data2 
            }
            this.food.addObject(temp)
        },
    },
});

應用程序/模板/decrement1.hbs

Javascript


{{page-title "decreaseProperty"}}
<h3>List of Item in Buckets</h3>
<table>
    <tr>
        <th> Food Name </th>
        <th>Bucket </th>
        <th>Fruit </th>
      </tr>
      {{#each @model as |website|}}
    <tr>
        <td>{{website.food}}</td>
          <td>{{website.quant}}</td>
          <td>{{website.isFruit}}</td>
    </tr>
      {{/each}}
</table>
<br /><br />
<div>
    <label>Enter Item Name: </label>
      {{input value=this.temp2}}
</div>
<br />
<div>
    <label>Enter Quantity in Kg: </label>
      {{input value=this.value}}
</div>
<input type="button" id="increase" value="+"
    {{action "older"}} />
<input type="button" id="decrease" value="-"
    {{action "younger"}} />
<br />
<br />
<div>
    <label>Item is fruit or not : </label>
      {{input value=this.temp}}
</div>
<br /><br />
<input
    type="button"
      id="all-Fruits"
      value="Add item"
      {{action "addItem" this.temp2 this.value this.temp}}
/>
{{outlet}}

輸出：訪問 localhost:4200/decrement1 查看輸出

Ember.js Ember.NativeArray decrementProperty 方法

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/控製器/decrement2.js

Javascript


import Ember from 'ember';
import { decrementProperty }
    from '@ember/array';
export default Ember.Controller.extend({
    year: 2022,
    month: 9,
    date: 15,
    actions: {
        olderD() {
            this.incrementProperty('date');
        },
        youngerD() {
            this.decrementProperty('date');
        },
        olderY() {
            this.incrementProperty('year');
        },
        youngerY() {
            this.decrementProperty('year');
        },
        olderM() {
            this.incrementProperty('month');
        },
        youngerM() {
            this.decrementProperty('month');
        },
    },
});

應用程序/模板/decrement2.hbs

Javascript


{{page-title "DecrementProperty"}}
<h1>Year {{this.year}}</h1>
<input type="button" id="increase"
    value="+" {{action "olderY"}} />
<input type="button" id="decrease"
    value="-" {{action "youngerY"}} />
<hr />
<h1>Month {{this.month}}</h1>
<input type="button" id="increase"
    value="+" {{action "olderM"}} />
<input type="button" id="decrease"
    value="-" {{action "youngerM"}} />
<hr />
<h1>Date {{this.date}}</h1>
<input type="button" id="increaseD"
    value="+" {{action "older"}} />
<input type="button" id="decrease"
    value="-" {{action "youngerD"}} />
{{outlet}}

輸出：訪問 localhost:4200/decrement2 查看輸出

Ember.js Ember.NativeArray decrementProperty 方法

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

相關用法

注：本文由純淨天空篩選整理自jeemains0neet大神的英文原創作品 Ember.js Ember.NativeArray 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。