Embeer.js EmberRouter 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() 函数用于将属性值递减到当前值减去指定的数量。

句法：

this.Object.decrementProperty( PropertyName, value) ;

参数：

PropertyName: 我们想要降低其值的属性通过其名称来标识。
value: 我们希望减少的值就是那个值。初始设置为 1。

返回：该方法返回一个对象。

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 temp1

应用程序/路线/temp1.js

Javascript


import Route from '@ember/routing/route'; 
import EmberObject from '@ember/object'; 
import Ember from 'ember'; 
  
  
export default class StudentsRoute extends Route { 
  
    CreateEmployee() { 
        let Employee = EmberObject.create({ 
            name: '', 
            gender: '', 
            position: '', 
            Salary: 100000, 
            email: '', 
            mobile: '', 
        }); 
        return Employee; 
    } 
    setName(data) { 
        return this.employee.set('name', data); 
    } 
    setGender() { 
        return this.employee.set('gender', 'M'); 
    } 
    setPosition(data) { 
        return this.employee.set('position', data); 
    } 
    SalaryDecrease(data) { 
        return this.employee.decrementProperty('Salary', data); 
    } 
    SalaryIncrease(data) { 
        return this.employee.incrementProperty('Salary', data); 
    } 
    setEmail(data) { 
        return this.employee.set('email', data); 
    } 
    setMobile(data) { 
        return this.employee.set('mobile', data); 
    } 
    model() { 
        this.employee = this.CreateEmployee(); 
        this.employee.name = this.setName('Yogesh Verma'); 
        this.employee.gender = this.setGender(); 
        this.employee.position = this.setPosition('Software Engineer'); 
        this.employee.email = this.setEmail('yogesh@gmail.com'); 
        this.employee.mobile = this.setMobile('9382938239'); 
        this.SalaryDecrease(10000); 
        return this.employee; 
    } 
    setupController(controller, model) { 
        super.setupController(controller, model); 
        controller.set('employee', this.employee); 
    } 
}

应用程序/模板/temp1.hbs

HTML


{{page-title "Employee"}} 
<h1>Employee Details:</h1> 
<div>Name: {{this.employee.name}}</div> 
<div>Gender: {{this.employee.gender}}</div> 
<div>Position: {{this.employee.position}}</div> 
<div>Salary: {{this.employee.Salary}}</div> 
<div>Mobile: {{this.employee.mobile}}</div> 
<div>Email: {{this.employee.email}}</div> 
{{outlet}}

输出：

输出1

示例 2：键入以下代码以生成本示例的路由：

ember generate route temp2

应用程序/路线/temp2.js

Javascript


import Route from '@ember/routing/route'; 
import EmberObject from '@ember/object'; 
import Ember from 'ember'; 
  
const Student = EmberObject.extend({ 
    changed: Ember.observer('Marks', function () { 
        console.log(`Marks Changed`); 
    }) 
}); 
export default class WebsitesRoute extends Route { 
  
    students = [ 
        Student.create({ 
            fullName: 'Sam Snehil', 
            Marks: 92, 
            class: 11, 
        }), 
        Student.create({ 
            fullName: 'Ram Sahu', 
            Marks: 84, 
            class: 10, 
        }), 
        Student.create({ 
            fullName: 'Soham Verma', 
            Marks: 89, 
            class: 12, 
        }), 
        Student.create({ 
            fullName: 'David Tigga', 
            Marks: 95, 
            class: 9, 
        }), 
        Student.create({ 
            fullName: 'Pokhu Verma', 
            Marks: 95, 
            class: 10, 
        }), 
        Student.create({ 
            fullName: 'Satyam Verma', 
            Marks: 96, 
            class: 12, 
        }), 
    ]; 
  
    temp; 
    model() { 
        return this.students; 
    } 
    setupController(controller, model) { 
        super.setupController(controller, model); 
        controller.set('students', this.students); 
        controller.set('temp', this.temp); 
    } 
}

应用程序/控制器/temp2.js

Javascript


import Ember from 'ember'; 
  
export default Ember.Controller.extend({ 
    actions: { 
          
        increaseMarks(data) { 
            this.students.forEach((item) => 
                item.incrementProperty('Marks', JSON.parse(data))); 
        }, 
        decreaseMarks(data) { 
            this.students.forEach((item) => 
                item.decrementProperty('Marks', JSON.parse(data))); 
        }, 
    }, 
});

应用程序/模板/temp2.hbs

HTML


{{page-title "incrementProperty"}} 
<h3>List of Item in Buckets</h3> 
<table> 
    <tr> 
        <th> Name </th> 
        <th>Class </th> 
        <th>Marks </th> 
    </tr> 
    {{#each @model as |temp|}} 
    <tr> 
        <td>{{temp.fullName}}</td> 
        <td>{{temp.class}}</td> 
        <td>{{temp.Marks}}</td> 
    </tr> 
    {{/each}} 
</table> 
<br /> 
<div> 
    <label>Enter value : </label> 
    {{input value=this.item}} 
</div><br /> 
<input
    type="button"
    id="increase-property"
    value="Increase Quantity"
    {{action "increaseMarks" this.item}} 
/> 
<br /><br /> 
<input
    type="button"
    id="decrease-property"
    value="decrease Quantity"
    {{action "decreaseMarks" this.item}} 
/> 
{{outlet}}

输出：

输出2

参考：https://api.emberjs.com/ember/4.9/classes/EmberRouter/methods/decrementProperty?anchor=decrementProperty

相关用法

注：本文由纯净天空筛选整理自jeemains0neet大神的英文原创作品 Ember.js EmberRouter 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。