Embeer.js ArrayProxy isDestroyed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。

ArrayProxy 的 isDestroyed 属性是显示已销毁对象属性标志状态的属性。如果此属性设置为 true，则表示该对象的观察者和其他元数据已被删除。

用法:

this.object.isDestroyed

Parameters: 它不带任何参数。

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 data1

应用程序/路线/data1.js

Javascript


import Route from '@ember/routing/route'; 
import EmberObject from '@ember/object'; 
import ArrayProxy from '@ember/object/proxy'; 
  
const Employee = ArrayProxy.extend({ 
    toStringExtension() { 
        return this.get('fullName'); 
    } 
}); 
  
export default class DetailsRoute extends Route { 
    person; 
    createPerson() { 
        let person = Employee.create({ 
            name: 'Rahul Singh', 
            age: 24, 
            mobile: '1298119967', 
            country: 'India', 
            language: { 
                0: ['Bengali'] 
            }, 
            salary: 10000, 
            gender: 'M', 
            zipCode: '800020', 
        }); 
        return person 
    } 
  
    model() { 
        this.person = this.createPerson(); 
        return this.person 
    } 
    setupController(controller, model) { 
        super.setupController(controller, model); 
        controller.set('person', this.person); 
    } 
}

应用程序/控制器/data1.js

Javascript


import Ember from 'ember'; 
import EmberObject from '@ember/object'; 
  
const Employee = EmberObject.extend({ 
    concatenatedProperties: ['work', 'contact'], 
    work: { 
        0: ['Developing Natural Language Processing'] 
    }, 
    contact: { 
        phone: ['9839281832'] 
    } 
}); 
export default Ember.Controller.extend({ 
  
    actions: { 
  
        des() { 
            let t1 = this.person.destroy(); 
            console.log(t1 + ' is Destroyed ') 
        }, 
        print() { 
            console.log('Value of isDestroyed : ' +  
               this.person.isDestroyed) 
        }, 
        IncreaseSalary() { 
            let temp = this.person.salary + 1000; 
            this.person.set('salary', temp); 
        } 
    } 
});

应用程序/模板/data1.hbs

HTML


{{page-title "ArrayProxy"}} 
<table> 
  
    <h1>Employee's Details: </h1> 
    <div><b>Name:</b> {{this.person.name}}</div> 
    <div><b>Gender:</b> {{this.person.gender}}</div> 
    <div><b>Salary:</b> {{this.person.salary}}</div> 
    <div><b>Mobile No.:</b>{{this.person.mobile}}</div> 
    <div><b>Zip Code:</b> {{this.person.zipCode}}</div> 
    <div><b>Country:</b> {{this.person.country}}</div> 
    <div><b>Age:</b> {{this.person.age}}</div> 
    <div><b>Work Under:</b> 
        {{#each-in this.person.language as |key value|}} 
        <li>{{value}}</li> 
        {{/each-in}} 
    </div> 
</table> 
  
  
<br /><br/> 
<input
    type="button"
    id="CacheFor"
    value="Destroy Details"
    {{action 'des'}} 
/><br /><br/> 
<input
    type="button"
    id="CacheFor"
    value="Print isDestroyed Property"
    {{action 'print'}} 
/> 
<br /><br/> 
<input
    type="button"
    id="Change"
    value="Increase Salary"
    {{action 'IncreaseSalary'}} 
> 
{{outlet}}

输出：

isDestroyed 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 data2

应用程序/路线/data2.js

Javascript


import Route from '@ember/routing/route'; 
import ArrayProxy from '@ember/object'; 
import { computed } from '@ember/object'; 
  
const Person = ArrayProxy.extend({ 
    fullName: computed('firstName', 'lastName', function () { 
        return this.get('firstName') + ' ' + 
            this.get('lastName'); 
    }), 
    toStringExtension() { 
        return this.get('fullName'); 
    } 
}); 
  
  
export default class StudentsRoute extends Route { 
    person = Person.create({ 
  
        firstName: 'Aman', 
        lastName: 'Verma', 
        gender: 'M', 
        class: 10, 
        marks: 83, 
        mobile: '8399384948', 
        grade: 'A', 
  
    }) 
  
    model() { 
        return this.person; 
    } 
    setupController(controller, model) { 
        super.setupController(controller, model); 
        controller.set('person', this.person); 
    } 
}

应用程序/控制器/data2.js

Javascript


import Ember from 'ember'; 
import EmberObject from '@ember/object'; 
import { cacheFor, destroy } from '@ember/object'; 
  
export default Ember.Controller.extend({ 
    actions: { 
  
        des() { 
            let t1 = this.person.destroy(); 
            console.log(t1 + ' is Destroyed ') 
        }, 
        print() { 
            console.log('Value of isDestroyed : ' + this.person.isDestroyed) 
        }, 
  
    } 
});

应用程序/模板/data2.hbs

HTML


{{page-title "ArrayProxy"}} 
<table> 
    <h1>Student's Details:</h1> 
    <div><b>Name:</b> {{this.person.fullName}}</div> 
    <div><b>Gender:</b> {{this.person.gender}}</div> 
    <div><b>Class:</b> {{this.person.class}}</div> 
    <div><b>Mobile:</b> {{this.person.mobile}}</div> 
    <div><b>Grade:</b> {{this.person.grade}}</div> 
    <div><b>Marks:</b> {{this.person.marks}}</div> 
      
  
</table> 
<br /><br/> 
<input
    type="button"
    id="CacheFor"
    value="Destroy Details"
    {{action 'des'}} 
/><br /><br/> 
<input
    type="button"
    id="CacheFor"
    value="Print Ember Class"
    {{action 'print'}} 
/> 
{{outlet}}

输出：

isDestroyed 属性输出2

参考：https://api.emberjs.com/ember/4.9/classes/ArrayProxy/properties?anchor=isDestroyed

相关用法

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 isDestroyed Property。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。