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Embeer.js EmberArray slice()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。

slice() 方法用于返回一个新数组，该数组是接收器的一部分。

用法:

slice(begin,end)

参数：

  • begin: 起始索引。
  • end: 结束索引。

返回：接收器在开始和结束之间的部分。

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 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: 'Patna', 
            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; 
    start; 
    end; 
    model() { 
        return this.details; 
    } 
    setupController(controller, model) { 
        super.setupController(controller, model); 
        controller.set('details', this.details); 
        controller.set('someMoreDetails', this.someMoreDetails); 
        controller.set('city', this.city); 
        controller.set('start', this.start); 
        controller.set('end', this.end); 
    } 
}

应用程序/控制器/details.js


import Ember from "ember"; 
import { any, slice, reverseObjects,  
    rejectBy } from "@ember/array"; 
  
export default Ember.Controller.extend({ 
    actions: { 
        checkCity(city) { 
            let res = this.details.any((person) =>  
            person.city == city); 
            alert(`Present: ${res ? "YES" : "NO"}`); 
        }, 
        sliceItems(start, end) { 
            let tempItems = this.details.slice(start, end); 
            let str = ""; 
            for (let i = 0; i < tempItems.length; i++) 
                str += tempItems[i].name + "\n"; 
            alert(str); 
        }, 
        reverse() { 
            this.set("details",  
            this.details.reverseObjects()); 
        }, 
        getFemale() { 
            let tempItems =  
                this.details.rejectBy("gender", "M"); 
            let str = ""; 
            for (let i = 0; i < tempItems.length; i++) 
                str += tempItems[i].name + "\n"; 
            alert(str); 
        }, 
        pushMoreDetails() { 
            this.details.pushObjects(this.someMoreDetails); 
        }, 
    }, 
});

应用程序/模板/details.hbs


{{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"
        {{action "checkCity" this.city}} 
    /> 
</div> 
<br /><br /> 
<div> 
    <label>Enter Start Index: </label> 
      {{input value=this.start}} 
</div> 
<div> 
    <label>Enter End Index: </label> 
      {{input value=this.end}} 
</div> 
<div> 
    <input
        type="button"
        id="slice-items"
        value="Slice Items"
        {{action "sliceItems" this.start this.end}} 
    /> 
</div> 
<br /><br /> 
<input
    type="button"
    id="push-details"
    value="Add More Details"
    {{action "pushMoreDetails"}} 
/> 
<br /><br /> 
<input type="button" id="reverse" value="Reverse" 
    {{action "reverse"}} /> 
<br /><br /> 
<input
    type="button"
    id="get-female"
    value="Get Female"
    {{action "getFemale"}} 
/>

输出：访问 localhost:4200/details 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 party

应用程序/路线/party.js


import Route from '@ember/routing/route'; 
  
export default class PartyRoute extends Route { 
    partyItems = [ 
        'Digital Camera', 
        'Jugs, cups & straws', 
        'Balloons', 
        'Scissors', 
        'Cold Drink', 
        'Table Confetti', 
        'Party Hats', 
        'Wine', 
        'Napkins', 
        'Party Plates', 
        'Speakers', 
        'Music System', 
        'Cups', 
    ]; 
    itemString; 
    itemList; 
    start; 
    end; 
    helper(itemString) { 
        this.itemList = itemString.split(','); 
        for (let i = 0; i < this.itemList.length; i++) 
            this.itemList[i] = this.itemList[i].trim(); 
        return this.itemList; 
    } 
    model() { 
        return this.partyItems; 
    } 
    setupController(controller, model) { 
        this._super(controller, model); 
        controller.set('helper', this.helper); 
        controller.set('partyItems', this.partyItems); 
        controller.set('itemString', this.itemString); 
        controller.set('itemList', this.itemList); 
        controller.set('start', this.start); 
        controller.set('end', this.end); 
    } 
}

应用程序/控制器/party.js


import Ember from "ember"; 
import { 
    objectsAt, 
    removeObject, 
    removeObjects, 
    slice, 
    reverseObjects, 
    setObjects, 
    reject, 
} from "@ember/array"; 
  
export default Ember.Controller.extend({ 
    actions: { 
        getItems(itemString) { 
            this.itemList = this.helper(itemString); 
            for (let i = 0; i < this.itemList.length; i++) 
                this.itemList[i] =  
                parseInt(this.itemList[i]); 
            let tempItems =  
                this.partyItems.objectsAt(this.itemList); 
            let str = ""; 
            for (let i = 0; i < tempItems.length; i++) 
                str += tempItems[i] + "\n"; 
            alert(str); 
        }, 
        removeItems(itemString) { 
            this.itemList = this.helper(itemString); 
            if (this.itemList.length == 1) 
                this.partyItems.removeObject(this.itemList[0]); 
            else this.partyItems.removeObjects(this.itemList); 
            this.set("itemString", ""); 
        }, 
        sliceItems(start, end) { 
            let tempItems = this.partyItems.slice(start, end); 
            let str = ""; 
            for (let i = 0; i < tempItems.length; i++) 
                str += tempItems[i] + "\n"; 
            alert(str); 
        }, 
        reverseItems() { 
            this.set("partyItems",  
                this.partyItems.reverseObjects()); 
        }, 
        replaceItems(itemString) { 
            this.partyItems.setObjects(this.helper(itemString)); 
        }, 
        findMultiwordItems() { 
            let reqItem = this.partyItems.reject( 
                (item) => item.split(" ").toArray().length == 1 
            ); 
            alert(reqItem); 
        }, 
    }, 
});

应用程序/模板/party.hbs


{{page-title "Party"}} 
<h3>Here is a list of items: </h3> 
<ul> 
    {{#each @model as |party|}} 
        <li>{{party}}</li> 
      {{/each}} 
</ul> 
<br /><br /> 
<div> 
    <label>Enter Items: </label> 
          {{input value=this.itemString}} 
</div> 
<div> 
    <input
        type="button"
        id="remove-item"
        value="Remove Items"
        {{action "removeItems" this.itemString}} 
      /> 
</div> 
<br /><br /> 
<div> 
    <label>Enter Start Index: </label> 
        {{input value=this.start}} 
</div> 
<div> 
    <label>Enter End Index: </label> 
          {{input value=this.end}} 
</div> 
<div> 
    <input
        type="button"
        id="slice"
        value="Slice"
        {{action "sliceItems" this.start this.end}} 
  /> 
</div> 
<br /><br /> 
<div> 
    <label>Enter Indices: </label> 
          {{input value=this.itemString}} 
</div> 
<div> 
    <input
        type="button"
        id="get-item"
        value="Get Items"
        {{action "getItems" this.itemString}} 
      /> 
</div> 
<br /><br /> 
<div> 
    <label>Enter Items: </label> 
          {{input value=this.itemString}} 
</div> 
<div> 
    <input
        type="button"
        id="replace-item"
        value="Replace Items"
        {{action "replaceItems" this.itemString}} 
      /> 
</div> 
<br /><br /> 
<input
    type="button"
      id="reverse-items"
      value="Reverse"
      {{action "reverseItems"}} 
/> 
<br /><br /> 
<input
    type="button"
    id="find-items"
    value="Find"
    {{action "findMultiwordItems"}} 
/> 
  
{{outlet}}

输出：访问 localhost:4200/party 查看输出：

参考： https://api.emberjs.com/ember/4.6/classes/EmberArray/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 EmberArray slice() 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。