Embeer.js MutableArray unshiftObject()用法及代碼示例

Ember.js 是一個開源 JavaScript 框架，用於開發基於 Model-View-Controller (MVC) 架構的大型客戶端 Web 應用程序。 Ember.js是使用最廣泛的前端應用框架之一。它的目的是加速開發並提高生產力。目前，它被大量網站使用，包括 Square、Discourse、Groupon、Linked In、Live Nation、Twitch 和 Chipotle。

unshiftObject() 方法用於將單個對象添加到數組的開頭。

用法:

unshiftObject(obj)

參數：

obj: 要添加的對象。

返回值：新的數組。

要運行以下示例，您需要有一個 ember 項目。要創建一個，您需要先安裝ember-cli。在終端中寫入以下代碼：

npm install ember-cli

現在您可以通過輸入以下代碼來創建項目：

ember new <project-name> --lang en

要啟動服務器，請鍵入：

ember serve

示例 1：鍵入以下代碼以生成本示例的路由：

ember generate route party

應用程序/路線/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', 
    ]; 
    item; 
    itemString; 
    itemList; 
    start; 
    end; 
    idx; 
    model() { 
        return this.partyItems; 
    } 
    setupController(controller, model) { 
        this._super(controller, model); 
        controller.set('partyItems', this.partyItems); 
        controller.set('item', this.item); 
        controller.set('itemString', this.itemString); 
        controller.set('itemList', this.itemList); 
        controller.set('start', this.start); 
        controller.set('end', this.end); 
        controller.set('idx', this.idx); 
    } 
}

應用程序/控製器/party.js


import Ember from 'ember'; 
import { 
    without, toArray, unshiftObject, unshiftObjects, 
    removeAt, objectAt, find, replace, uniq 
} 
    from '@ember/array'; 
  
export default Ember.Controller.extend({ 
    actions: { 
        withoutItem(item) { 
            console.log(item) 
            let tempItems; 
            tempItems = this.partyItems.without(item); 
            let str = ''; 
            for (let i = 0; i < tempItems.length; i++) 
                str += tempItems[i] + '\n'; 
            alert(str); 
            this.set('item', ''); 
        }, 
        addItems(itemString) { 
            this.itemList = itemString.split(',').toArray(); 
            if (this.itemList.length == 1) 
                this.partyItems.unshiftObject(this.itemList[0]); 
            else
                this.partyItems.unshiftObjects(this.itemList); 
            this.set('itemString', ''); 
        }, 
        removeItems(start, end) { 
            this.partyItems.removeAt(start, end); 
        }, 
        getObject(idx) { 
            alert(`The item at index ${idx} is  
            ${this.partyItems.objectAt(idx)}`); 
        }, 
        findMultipleWordItems() { 
            let reqItem = this.partyItems.find((item) =>  
            item.split(' ').toArray().length > 1); 
            alert(reqItem); 
        }, 
        replaceItem(itemString) { 
            this.itemList = itemString.split(',').toArray(); 
            if (this.itemList.length > this.partyItems.length) 
                alert('Error'); 
            this.partyItems.replace(0, this.itemList.length, 
                                    this.itemList); 
        }, 
        getUniqueItems() { 
            let tempItems = this.partyItems.uniq(); 
            let str = ''; 
            for (let i = 0; i < tempItems.length; i++) 
                str += tempItems[i] + '\n'; 
            alert(str); 
            this.set('item', ''); 
        }, 
    }, 
});

應用程序/模板/party.js


{{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 Item: </label> 
    {{input value=this.item}} 
</div> 
<div> 
    <input type="button" id="remove-item" 
           value="Remove Item" 
           {{action 'withoutItem' this.item}} /> 
</div> 
<br /><br /> 
<div> 
    <label>Enter Items: </label> 
    {{input value=this.itemString}} 
</div> 
<div> 
    <input type="button" id="add-item" 
           value="Add Items" 
           {{action 'addItems' 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="remove-items" 
           value="Remove Items"
           {{action 'removeItems' this.start this.end}} /> 
</div> 
<br /><br /> 
<div> 
    <label>Enter Index: </label> 
    {{input value=this.idx}} 
</div> 
<div> 
    <input type="button" id="get-item" 
           value="Get Item" 
           {{action 'getObject' this.idx}} /> 
</div> 
<br /><br /> 
<div> 
    <label>Enter Items: </label> 
    {{input value=this.itemString}} 
</div> 
<div> 
    <input type="button" id="replace-item" 
           value="Replace Items" 
           {{action 'replaceItem' this.itemString}} /> 
</div> 
<br /><br /> 
<input type="button" id="get-multiword" 
       value="Get Multiword Items!" 
       {{action 'findMultipleWordItems' }} /> 
<br /><br /> 
<input type="button" id="get-unique" 
       value="Get Unique Items!" 
       {{action 'getUniqueItems' }} /> 
{{outlet}}

輸出：訪問 localhost:4200/party 查看輸出

示例 2：鍵入以下代碼以生成本示例的路由：

ember generate route notepad

應用程序/路線/notepad.js


import Route from '@ember/routing/route'; 
  
export default class NotepadRoute extends Route { 
    items = []; 
    item; 
    model() { 
        return this.items; 
    } 
    setupController(controller, model) { 
        super.setupController(controller, model); 
        controller.set('items', this.items); 
    } 
}

應用程序/控製器/notepad.js


import Ember from 'ember'; 
import { pushObject } from '@ember/array'; 
  
export default Ember.Controller.extend({ 
    actions: { 
        withoutItem(item) { 
            let tempItems; 
            tempItems = this.items.without(item); 
            let str = ''; 
            for (let i = 0; i < tempItems.length; i++) 
                str += tempItems[i] + '\n'; 
            alert(str); 
            this.set('item', ''); 
        }, 
        replaceItem(item) { 
            let itemList = item.split(',').toArray(); 
            if (itemList.length > this.items.length) 
                alert('Error'); 
            this.items.replace(0, itemList.length, itemList); 
        }, 
        addItem(item) { 
            this.items.unshiftObject(item); 
        }, 
        getUniqueItems() { 
            let tempItems = this.items.uniq(); 
            let str = ''; 
            for (let i = 0; i < tempItems.length; i++) 
                str += tempItems[i] + '\n'; 
            alert(str); 
            this.set('item', ''); 
        }, 
    }, 
});

應用程序/模板/notepad.hbs


{{page-title "Notepad"}} 
<h2>Notepad</h2> 
<div> 
    <label>Enter Item: </label> 
    {{input value=this.item}} 
</div> 
<div> 
    <input type="button" id="add-item" 
           value="Add Item" 
           {{action 'addItem' this.item}} /> 
</div> 
<br /><br /> 
<ul> 
    {{#each @model as |item|}} 
    <li>{{item}}</li> 
    {{/each}} 
</ul> 
  
<br /><br /> 
<div> 
    <label>Enter Item: </label> 
    {{input value=this.item}} 
</div> 
<div> 
    <input type="button" id="without-item" 
           value="Without Item" 
           {{action 'withoutItem' this.item}} /> 
</div> 
<br /><br /> 
<div> 
    <label>Enter Item: </label> 
    {{input value=this.item}} 
</div> 
<div> 
    <input type="button" id="replace-item" 
           value="Replace Item"
           {{action 'replaceItem' this.item}} /> 
</div> 
<br /><br /> 
<input type="button" id="get-unique" 
       value="Get Unique Items!" 
       {{action 'getUniqueItems' }} /> 
{{outlet}}

輸出：訪問 localhost:4200/notepad 查看輸出

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

相關用法

注：本文由純淨天空篩選整理自aayushmohansinha大神的英文原創作品 Ember.js MutableArray unshiftObject() Method。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。