Ember.js MutableArray find() 方法

Ember.js MutableArray find() 方法

Ember.js 是一个开源的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是最广泛使用的前端应用程序框架之一。它旨在加快开发速度并提高生产效率。目前,它被许多网站使用,包括Square、Discourse、Groupon、Linked In、Live Nation、Twitch和Chipotle。

find() 方法用于查找与给定回调函数匹配的元素。

语法:

find(callback, target)

参数:

  • callback(回调函数): 要检查的回调函数。
  • target(目标): 要检查其元素的对象。

返回值: 匹配的对象。

要运行以下示例,您需要有一个Ember项目。要创建一个项目,您首先需要安装ember-cli。在终端中写入以下代码:

npm install ember-cli

现在,您可以通过键入以下代码来创建项目:

ember new <project-name> --lang en

要启动服务器,请输入:

ember serve

示例1

输入以下代码,生成该示例的路线:

ember generate route party

app/routes/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); 
    } 
}

app/controllers/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', ''); 
        }, 
    }, 
});

app/template/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}}

输出: 访问 localhost:4200/party 查看输出结果

Ember.js MutableArray find() 方法

示例2

输入以下代码以生成此示例的路由:

ember generate route details

app/routes/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', 
        }, 
    ]; 
    start; 
    end; 
    idx; 
    model() { 
        return this.details; 
    } 
    setupController(controller, model) { 
        super.setupController(controller, model); 
        controller.set('details', this.details); 
        controller.set('someMoreDetails', this.someMoreDetails); 
        controller.set('start', this.start); 
        controller.set('end', this.end); 
        controller.set('idx', this.idx); 
    } 
}

app/controllers/details.js

import Ember from 'ember'; 
import { removeAt, unshiftObjects, objectAt,  
        uniqBy, find } from '@ember/array'; 
  
export default Ember.Controller.extend({ 
    actions: { 
        removeDetails(start, end) { 
            this.details.removeAt(start, end); 
        }, 
        addMoreDetails() { 
            this.details.unshiftObjects(this.someMoreDetails); 
        }, 
        getDetail(index) { 
            let foo = this.details.objectAt(index); 
            alert(foo.name); 
        }, 
        getFirstMaleAndFemalePerson() { 
            let foo = this.details.uniqBy('gender').toArray(); 
            let str = ""; 
            for (let i = 0; i < foo.length; i++) 
                str += foo[i].name + "\n"; 
            alert(str); 
        }, 
        getFirstMale() { 
            let foo = this.details.find( 
                (detail) => detail.gender === 'M'); 
            alert(foo.name); 
        }, 
    }, 
});

app/template/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 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-details" 
           value="Remove Details" 
           {{action 'removeDetails' this.start this.end}} /> 
</div> 
<br /><br /> 
<div> 
    <label>Enter Index: </label> 
    {{input value=this.idx}} 
</div> 
<div> 
    <input type="button" id="get-detail" 
           value="Get detail"
           {{action 'getDetail' this.idx}} /> 
</div> 
<br /><br /> 
<input type="button" id="add-details" 
       value="Add More Details" 
       {{action 'addMoreDetails' }} /> 
<br /><br /> 
<input type="button" id="all-male" 
       value="Get First Male" 
       {{action 'getFirstMale' }} /> 
<br /><br /> 
<input type="button" id="get" value="Get" 
       {{action 'getFirstMaleAndFemalePerson' }} /> 
{{outlet}}

输出: 访问 localhost:4200/details 查看输出

Ember.js MutableArray find() 方法

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

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