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Embeer.js MutableArray shiftObject()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。

如果没有更多的对象，shiftObject() 方法会从数组的开头移动 nil 或对象。

用法:

shiftObject()

Parameters: 它不需要任何参数。

Returns: 移动的物体。

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 fruits

应用程序/路线/fruits.js


import Route from "@ember/routing/route"; 
import { } from "@ember/array"; 
  
export default class FruitsRoute extends Route { 
    fruits = [ 
        { 
            name: "Lady Finger", 
            isFruit: false, 
            color: "green", 
        }, 
        { 
            name: "Brinjal", 
            isFruit: false, 
            color: "purple", 
        }, 
        { 
            name: "Apple", 
            isFruit: true, 
            color: "red", 
        }, 
        { 
            name: "Grapes", 
            isFruit: true, 
            color: "green", 
        }, 
        { 
            name: "Mango", 
            isFruit: true, 
            color: "yellow", 
        }, 
        { 
            name: "Watermelon", 
            isFruit: true, 
            color: "red", 
        }, 
        { 
            name: "Orange", 
            isFruit: true, 
            color: "orange", 
        }, 
    ]; 
    model() { 
        return this.fruits; 
    } 
    setupController(controller, model) { 
        super.setupController(controller, model); 
        controller.set("fruits", this.fruits); 
    } 
}

应用程序/控制器/fruits.js


import Ember from "ember"; 
import { shiftObject, isAny, isEvery } from "@ember/array"; 
  
export default Ember.Controller.extend({ 
    actions: { 
        removeFruit() { 
            this.fruits.shiftObject(); 
        }, 
        anyFruit() { 
            alert(`${this.fruits.isAny("isFruit") ? "Yes" : "No"}`); 
        }, 
        allFruit() { 
            alert(`${this.fruits.isEvery("isFruit") ? "Yes" : "No"}`); 
        }, 
    }, 
});

应用程序/模板/fruits.js


{{page-title "Fruits"}} 
<h3>Here is a list of eatables: </h3> 
<ul> 
    {{#each @model as |eatable|}} 
    <li style="color: {{eatable.color}}">{{eatable.name}}</li> 
    {{/each}} 
</ul> 
<br /><br /> 
<input type="button"
       id="remove-eatable"
       value="Remove Eatable" {{action 'removeFruit' }} /> 
<br /><br /> 
<input type="button" 
       id="fruit-any" 
       value="List Contains Any Fruit?" {{action 'anyFruit' }} /> 
<br /><br /> 
<input type="button" 
       id="fruit-all" 
       value="List Contains Only Fruit?" {{action 'allFruit' }} /> 
{{outlet}}

输出：访问 localhost:4200/fruits 查看输出

示例 2：键入以下代码以生成本示例的路由：

ember generate route details

应用程序/路线/details.js


import Route from '@ember/routing/route'; 
  
export default class DetailsRoute extends Route { 
    details = [ 
        { 
            'name': 'Anubhav', 
            'mobile': '1298119967', 
            'city': 'Patna', 
            'country': 'India', 
            'gender': 'M', 
            'zipCode': '800020'
        }, 
        { 
            'name': 'Sakshi', 
            'mobile': '1234567890', 
            'city': 'Mumbai', 
            'country': 'India', 
            'gender': 'F', 
            'zipCode': '400001'
        }, 
        { 
            'name': 'Satyam', 
            'mobile': '2222222222', 
            'city': 'Delhi', 
            'country': 'India', 
            'gender': 'M', 
            'zipCode': '110012'
        }, 
        { 
            'name': 'Shivam', 
            'mobile': '1122113322', 
            'city': 'Bangalore', 
            'country': 'India', 
            'gender': 'M', 
            'zipCode': '530068'
        }, 
        { 
            'name': 'Ayushi', 
            'mobile': '2244668800', 
            'city': 'Jaipur', 
            'country': 'India', 
            'gender': 'F', 
            'zipCode': '302001'
        } 
    ]; 
    someMoreDetails = [ 
        { 
            'name': 'Yeshwant', 
            'mobile': '1133557799', 
            'city': 'Chennai', 
            'country': 'India', 
            'gender': 'M', 
            'zipCode': '600001'
        }, 
        { 
            'name': 'Siddhant', 
            'mobile': '9911000000', 
            'city': 'Mangalore', 
            'country': 'India', 
            'gender': 'M', 
            'zipCode': '574142'
        }, 
        { 
            'name': 'Khushi', 
            'mobile': '8888888888', 
            'city': 'Pune', 
            'country': 'India', 
            'gender': 'F', 
            'zipCode': '111045'
        } 
    ]; 
    city; 
    code; 
    model() { 
        return this.details; 
    } 
    setupController(controller, model) { 
        this._super(controller, model); 
        controller.set('details', this.details); 
        controller.set('someMoreDetails', this.someMoreDetails); 
        controller.set('city', this.city); 
        controller.set('code', this.code); 
    } 
}

应用程序/控制器/details.js


import Ember from "ember"; 
import { pushObjects, shiftObject, setEach } from "@ember/array"; 
  
export default Ember.Controller.extend({ 
    actions: { 
        checkCity(city) { 
            alert(`Contains Person from ${city}:  
            ${this.details.isAny("city", city) ? "Yes" : "No"}`); 
        }, 
        checkCountry() { 
            alert(`All are ${this.details 
                .isEvery("country", "India") ? "" : "not"}  
             Indian`); 
        }, 
        remove() { 
            this.details.shiftObject(); 
        }, 
        setZipCode(code) { 
            this.details.setEach("zipCode", code); 
        }, 
        pushMoreDetails() { 
            this.details.pushObjects(this.someMoreDetails); 
        }, 
    }, 
});

应用程序/模板/details.js


{{page-title "Details"}} 
<h3>List of People: </h3> 
<br/><br/> 
<table> 
    <tr> 
        <th>Name</th> 
        <th>Gender</th> 
        <th>Mobile</th> 
        <th>City</th> 
        <th>Country</th> 
        <th>Zip Code</th> 
    </tr> 
    {{#each @model as |detail|}} 
    <tr> 
        <td>{{detail.name}}</td> 
        <td>{{detail.gender}}</td> 
        <td>{{detail.mobile}}</td> 
        <td>{{detail.city}}</td> 
        <td>{{detail.country}}</td> 
        <td>{{detail.zipCode}}</td> 
    </tr> 
    {{/each}} 
</table> 
  
<br/><br/> 
<div> 
    <label>Enter City: </label> 
    {{input value=this.city}} 
</div> 
<div> 
    <input type="button" id="check-city" 
        value="Check City" {{action 'checkCity' this.city}}/> 
</div> 
<br/><br/> 
<div> 
    <label>Enter Code: </label> 
    {{input value=this.code}} 
</div> 
<div> 
    <input type="button" id="set-code" 
        value="Set Zip Code" {{action 'setZipCode' this.code}}/> 
</div> 
<br/><br/> 
<input type="button" id="remove-detail" 
       value="Remove" {{action 'remove'}}/> 
<br/><br/> 
<input type="button" id="push-details" value="Add More Details" 
       {{action 'pushMoreDetails'}}/> 
<br/><br/> 
<input type="button" id="check-country" value="All Indian?"
       {{action 'checkCountry'}}/> 
{{outlet}}

输出：访问 localhost:4200/details 查看输出

参考：https://api.emberjs.com/ember/4.4/classes/MutableArray/methods



相关用法


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