Embeer.js Observable incrementProperty()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。

incrementProperty() 方法用于将属性值增加到一定数量。

用法:

incrementProperty( keyName, increment );

参数：

keyName: 它是我们要增加其值的属性的名称。
increment: 这是我们想要增加的值。

返回值：新的属性值。

安装和运行 Ember.js 的步骤：

第 1 步：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

第 2 步：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 increment1

应用程序/路线/increment1.js

Javascript


import Route from '@ember/routing/route'; 
import EmberObject from '@ember/object'; 
  
export default class WebsitesRoute extends Route { 
    temp; 
    model() { 
        return 'Increment Property'; 
    } 
    setupController(controller, model) { 
        super.setupController(controller, model); 
        controller.set('temp', this.temp); 
        controller.set('temp2', this.temp2); 
    } 
}

应用程序/控制器/increment1.js

Javascript


import Ember from 'ember'; 
import EmberObject from '@ember/object'; 
  
const Food = EmberObject.extend({ 
    toStringExtension() { 
        return this.get('food'); 
    } 
}); 
export default Ember.Controller.extend({ 
    value: 0, 
    food: [ 
        Food.create({ 
            food: 'apple', 
            isFruit: true, 
            quant: '1', 
        }), 
        Food.create({ 
            food: 'Potato', 
            isFruit: false, 
            quant: '2', 
        }), 
        Food.create({ 
            food: 'Banana', 
            isFruit: true, 
            quant: '1', 
        }), 
        Food.create({ 
            food: 'Burgur', 
            isFruit: false, 
            quant: '2', 
        }), 
        Food.create({ 
            food: 'Orange', 
            isFruit: true, 
            quant: '1', 
        }), 
        Food.create({ 
            food: 'sandwitch', 
            isFruit: false, 
            quant: '2', 
        }), 
        Food.create({ 
            food: 'bean', 
            isFruit: false, 
            quant: '2', 
        }), 
    ], 
    actions: { 
        older() { 
            this.incrementProperty('value'); 
        }, 
        younger() { 
            this.decrementProperty('value'); 
        }, 
  
        addItem(data, data1, data2) { 
  
            let temp = Food.create({ 
                food: data, 
                isFruit: data1, 
                quant: data2 
            }); 
            alert(temp.toString() + ' Created'); 
            this.food.addObject(temp); 
        } 
    } 
});

应用程序/模板/increment1.hbs

HTML


{{page-title "increaseProperty"}} 
<h3>List of Item in Buckets</h3> 
<table> 
    <tr> 
        <th> Food Name </th> 
        <th>Bucket </th> 
        <th>Fruit </th> 
      </tr> 
      {{#each this.food 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 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：

增量属性输出1

示例 2：键入以下代码以生成本示例的路由：

ember generate route increment2

应用程序/路线/increment2.js

Javascript


import Route from '@ember/routing/route'; 
import EmberObject from '@ember/object'; 
  
export default class WebsitesRoute extends Route { 
  
    temp; 
    model() { 
        return "Increment Property"; 
    } 
    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/increment2.js

Javascript


import Ember from 'ember'; 
import EmberObject from '@ember/object'; 
  
const Student = EmberObject.extend({ 
    toStringExtension() { 
        return this.get('food'); 
    } 
}); 
export default Ember.Controller.extend({ 
    class: 10, 
    age: 15, 
    student: [ 
        Student.create({ 
            Name: 'Aarbh', 
            class: 12, 
            age: 18, 
        }), 
        Student.create({ 
            Name: 'viky', 
            class: 9, 
            age: 15, 
        }), 
        Student.create({ 
            Name: 'Chiku', 
            class: 8, 
            age: 11, 
        }), 
        Student.create({ 
            Name: 'Nikki', 
            class: 11, 
            age: 17, 
        }), 
        Student.create({ 
            Name: 'Ankit', 
            class: 8, 
            age: 14, 
        }), 
        Student.create({ 
            Name: 'Sonam', 
            class: 11, 
            age: 17, 
        }), 
        Student.create({ 
            Name: 'Ravi', 
            class: 10, 
            age: 16, 
        }), 
    ], 
    actions: { 
        older(data) { 
            this.incrementProperty(data); 
        }, 
        younger(data) { 
            this.decrementProperty(data); 
        }, 
  
        addItem(data, data1, data2) { 
  
            let temp = Student.create({ 
                Name: data, 
                class: data1, 
                age: data2 
            }); 
            alert(temp.toString() + ' Student Added in list'); 
            this.student.addObject(temp); 
        } 
    } 
});

应用程序/模板/increment2.hbs

HTML


{{page-title "incrementProperty"}} 
<h3>List of Item in Buckets</h3> 
<table> 
    <tr> 
        <th> Name </th> 
        <th>Class </th> 
        <th>Age </th> 
      </tr> 
      {{#each this.student as |website|}} 
        <tr> 
              <td>{{website.Name}}</td> 
              <td>{{website.class}}</td> 
              <td>{{website.age}}</td> 
        </tr> 
     {{/each}} 
</table> 
<br /><br /> 
<div> 
    <label>Enter Student Name: </label> 
      {{input value=this.temp2}} 
</div> 
<br /> 
<div> 
    <label>Enter Age: </label> 
      {{input value=this.age}} 
</div> 
<input type="button" id="increase" 
    value="+" {{action "older" "age"}} /> 
<input type="button" id="decrease" 
    value="-" {{action "younger" "age"}} /> 
<br /> 
<br /> 
<div> 
    <label>Enter Class: </label> 
      {{input value=this.class}} 
</div> 
<input type="button" id="increase" 
    value="+" {{action "older" "class"}} /> 
<input type="button" id="decrease" 
    value="-" {{action "younger" "class"}} /> 
<br /> 
<br /> 
<br /><br /> 
<input
    type="button"
    id="all-Fruits"
    value="Add item"
    {{action "addItem" this.temp2 this.class this.age}} 
/> 
{{outlet}}

输出：

增量属性输出2

参考：https://api.emberjs.com/ember/4.4/classes/Observable/methods/incrementProperty?anchor=incrementProperty

相关用法

注：本文由纯净天空筛选整理自singhanuj78276大神的英文原创作品 Ember.js Observable incrementProperty() 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。