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Embeer.js Component 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: 它是我们要减少其值的属性的名称。
  • increment: 这是我们想要增加的值。默认值为 1。

返回值：此方法返回一个新的属性值。

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/组件/compact.js

Javascript


import Component from '@glimmer/component';
import { tracked } from '@glimmer/tracking';
import { action, incrementProperty, 
    defineProperty } from '@ember/object';
import EmberObject from '@ember/object';
const Food = EmberObject.extend({
    toStringExtension() {
        return this.get('food');
    }
});
export default class extends Component {
    @tracked
    value = Food.create({
        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',
        }),
    ];
    older() {
        this.value.incrementProperty('value');
    }
    younger() {
        this.value.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/组件/compact.hbs

HTML


{{page-title "incrementProperty"}}
<h3>{{yield}}</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.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}}

应用程序/模板/increment.hbs

HTML


<Compact>
    List of Item in Buckets
</Compact>
{{outlet}}

输出：

减量属性输出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/组件/compact2.js

Javascript


import Component from '@glimmer/component';
import { tracked } from '@glimmer/tracking';
import { action } from '@ember/object';
import EmberObject from '@ember/object';
const Student = EmberObject.extend({
    toStringExtension() {
        return this.get('food');
    }
});
export default class extends Component {
    @tracked
    val1 = Student.create({
        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,
        }),
    ];
    older(data) {
        this.val1.incrementProperty(data);
    }
    younger(data) {
        this.val1.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/组件/compact2.hbs

HTML


{{page-title "incrementProperty"}}
<h3>{{yield}}</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.val1.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.val1.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}}

应用程序/模板/decrement2.hbs

HTML


<Compact2>
    List of Item in Buckets
</Compact2>
{{outlet}}

输出：

减量属性输出2

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



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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 Component 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。