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Embeer.js ArrayProxy decrementProperty()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。

decrementProperty() 方法用于将属性的值设置为当前值减去某个值。

用法:

decrementProperty( keyName, decrement );

参数:

  • keyName: 它是我们想要减少其值的属性的名称。
  • decrement: 这是属性将减少的数量。

返回值:新的属性值。

安装和运行 Ember.js 的步骤:

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

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 decrement1

应用程序/控制器/decrement1.js


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'); 
        }, 
    }, 
});

应用程序/模板/decrement1.hbs


{{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}}

输出:访问 localhost:4200/decrement1 查看输出

Ember.js ArrayProxy decrementProperty 方法

示例 2:键入以下代码以生成本示例的路由:

ember generate route decrement2

应用程序/路线/decrement2.js


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); 
    } 
}

应用程序/控制器/decrement2.js


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) 
        }, 
    }, 
});

应用程序/模板/decrement2.hbs


{{page-title "decrementProperty"}} 
<h3>List of Item in Buckets</h3> 
  
<table> 
    <tr> 
        <th> Food Name   </th> 
        <th>Bucket  </th> 
        <th>Fruit  </th> 
    </tr> 
    {{#each @model as |i|}} 
    <tr> 
        <td>{{i.food}}</td> 
        <td>{{i.quant}}</td> 
        <td>{{i.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 of 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}}

输出:访问 localhost:4200/decrement2 查看输出

Ember.js ArrayProxy decrementProperty 方法

参考:https://api.emberjs.com/ember/4.6/classes/ArrayProxy/methods/decrementProperty?anchor=decrementProperty



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注:本文由纯净天空筛选整理自satyam00so大神的英文原创作品 Ember.js ArrayProxy decrementProperty() 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。