Ember.js ArrayProxy的setEach()方法

Ember.js 是一个基于模型-视图-控制器（MVC）架构的开源JavaScript框架，用于开发大型客户端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力。目前，许多网站都在使用它，包括Square、Discourse、Groupon、Linked In、Live Nation、Twitch和Chipotle等。

setEach()方法 用于设置数组中每个元素的命名属性的值。

语法:

setEach( key, value );

参数：

key： 这是我们想要设置值的键的名称。
value： 这是要为键设置的值。

返回值： 接收器。

安装和运行Ember.js的步骤：

步骤1： 要运行以下示例，您需要先拥有一个Ember项目。要创建一个项目，您需要首先安装ember-cli。在终端中写入以下代码：

npm install ember-cli

步骤2： 现在您可以通过输入以下代码片段来创建项目：

ember new <project-name> --lang en

要启动服务器，请键入：

ember serve

示例1: 输入以下代码以生成此示例的路由：

ember generate route setEach1

app/routes/setEach1.js

import Route from '@ember/routing/route'; 
export default class FruitsRoute extends Route { 
    fruits = [ 
        { 
            'name': 'Lady Finger', 
            'isFruit': false, 
            'color': 'green', 
            'quant': 2, 
        }, 
        { 
            'name': 'Brinjal', 
            'isFruit': false, 
            'color': 'purple', 
            'quant': 2, 
        }, 
        { 
            'name': 'Apple', 
            'isFruit': true, 
            'color': 'red', 
            'quant': 5, 
        }, 
        { 
            'name': 'Grapes', 
            'isFruit': true, 
            'color': 'green', 
            'quant': 4, 
        }, 
        { 
            'name': 'Mango', 
            'isFruit': true, 
            'color': 'yellow', 
            'quant': 3, 
        }, 
        { 
            'name': 'Watermelon', 
            'isFruit': true, 
            'color': 'red', 
            'quant': 2, 
        }, 
        { 
            'name': 'Orange', 
            'isFruit': true, 
            'color': 'orange', 
            'quant': 2, 
        }, 
        { 
            'name': 'Banana', 
            'isFruit': true, 
            'color': 'yellow', 
            'quant': 5, 
        }, 
        { 
            'name': 'Papaya', 
            'isFruit': true, 
            'color': 'orange', 
            'quant': 5, 
        }, 
    ]; 
    item2; 
    item3; 
    model() { 
        return this.fruits; 
    } 
    setupController(controller, model) { 
        super.setupController(controller, model); 
        controller.set('fruits', this.fruits); 
        controller.set('item1', this.item1); 
        controller.set('item2', this.item2); 
        controller.set('item3', this.item3); 
    } 
}

app/controllers/setEach1.js

import Ember from "ember"; 
  
export default Ember.Controller.extend({ 
    actions: { 
        show_Fruits() { 
            let temp = this.fruits.rejectBy('isFruit', false); 
            let foo = temp.mapBy('name'); 
            alert(foo.join('\n')) 
        }, 
        slice_items(idx1, idx2) { 
            let foo = this.fruits.slice(idx1, idx2); 
            let ans = foo.mapBy('name') 
            alert(ans.join('\n')) 
        }, 
        remove() { 
            this.fruits.shiftObject(); 
  
        }, 
        set_quant(data) { 
            this.fruits.setEach('quant', data); 
  
        }, 
        select() { 
            let temp = this.fruits.uniqBy('color'); 
            let ans = temp.mapBy('name'); 
            alert(ans.join('\n')); 
        } 
    }, 
});

app/templates/setEach1.hbs

{{page-title "setEach"}} 
<h3>Here is a list of eatables: </h3> 
<table> 
    <tr> 
        <th>Name</th> 
        <th>Fruit</th> 
        <th>Color</th> 
        <th>Quantity</th> 
      </tr> 
      {{#each @model as |detail|}} 
    <tr> 
          <td>{{detail.name}}</td> 
          <td>{{detail.isFruit}}</td> 
          <td>{{detail.color}}</td> 
          <td>{{detail.quant}}</td> 
        </tr> 
      {{/each}} 
</table> 
<br /><br /> 
<div> 
    <label>Enter first index: </label> 
      {{input value=this.temp}} 
</div> 
<div> 
    <label>Enter last indexs: </label> 
      {{input value=this.temp2}} 
</div> 
<input 
    type="button"
      id="check-atIndex"
      value="Slice list"
      {{action "slice_items" this.temp this.temp2}} 
/> 
<br /> 
<br /> 
<div> 
    <label>Enter Quantity: </label> 
      {{input value=this.temp3}} 
</div> 
<input 
    type="button"
      id="set-quant"
      value="Set Each Quantity"
      {{action "set_quant" this.temp3}} 
/> 
<br /><br /> 
<div> 
    <input 
        type="button"
        id="removeFruit"
        value="Remove 1's Fruit"
        {{action "remove"}} 
      /> 
</div> 
<br /> 
<div> 
    <input 
        type="button"
        id="addFruit"
        value="Show Fruit"
        {{action "show_Fruits"}} 
      /> 
</div> 
<br /> 
<input 
    type="button"
      id="select-fruits"
      value="Select One item of Each color"
      {{action "select"}} 
/> 
{{outlet}}

输出： 访问 localhost:4200/setEach1 查看输出结果

Ember.js ArrayProxy的setEach()方法

示例2： 输入以下代码以生成此示例的路由：

ember generate route setEach2

app/routes/setEach2.js

import Route from "@ember/routing/route"; 
  
export default class StudentsRoute extends Route { 
    students = [ 
        { 
            name: "Aaush Somankar", 
            gender: "M", 
            class: 12, 
            grade: "A", 
            mobile: 7897391833, 
        }, 
        { 
            name: "Aman Prakash", 
            gender: "M", 
            class: 10, 
            grade: "A", 
            mobile: 8293839918, 
        }, 
        { 
            name: "Siya guru", 
            gender: "F", 
            class: 11, 
            grade: "B", 
            mobile: 6293839912, 
        }, 
        { 
            name: "Ramesh verma", 
            gender: "M", 
            class: 10, 
            grade: "A", 
            mobile: 7193839932, 
        }, 
        { 
            name: "Esnoor", 
            gender: "M", 
            class: 9, 
            grade: "F", 
            mobile: 8372819383, 
        }, 
        { 
            name: "Balit", 
            gender: "M", 
            class: 10, 
            grade: "A", 
            mobile: 7361927365, 
        }, 
        { 
            name: "Dora", 
            gender: "F", 
            class: 12, 
            grade: "F", 
            mobile: 5634152617, 
        }, 
        { 
            name: "Lalu", 
            gender: "F", 
            class: 8, 
            grade: "A", 
            mobile: 8372618392, 
        }, 
        { 
            name: "Pokhraj", 
            gender: "M", 
            class: 11, 
            grade: "F", 
            mobile: 9302810231, 
        }, 
        { 
            name: "Rahul", 
            gender: "M", 
            class: 9, 
            grade: "A", 
            mobile: 7837919373, 
  
        }, 
        { 
            name: "Ram", 
            gender: "M", 
            class: 12, 
            grade: "A", 
            mobile: 8272112539, 
        }, 
        { 
            name: "Priti", 
            gender: "F", 
            class: 9, 
            grade: "F", 
            mobile: 8836172912, 
        }, 
        { 
            name: "Sita", 
            gender: "F", 
            class: 8, 
            grade: "A", 
            mobile: 9193830293, 
        }, 
    ]; 
    convert(string) { 
        this.item = string.split(",").map((item) =>  
            item.trim()); 
            return this.item; 
    } 
  
    model() { 
        return this.students; 
    } 
    setupController(controller, model) { 
        super.setupController(controller, model); 
        controller.set("students", this.students); 
        controller.set("convert", this.convert); 
        controller.set("item", this.item); 
    } 
}

app/controllers/setEach2.js

import Ember from "ember"; 
  
export default Ember.Controller.extend({ 
    actions: { 
        select() { 
            let temp = this.students.uniqBy('class'); 
            let ans = temp.mapBy('name') 
            alert(ans.join('\n')) 
        }, 
        hide() { 
            this.students.setEach('mobile', '**********') 
        }, 
        allPass() { 
            let tempItems =  
                this.students.rejectBy('grade', 'F'); 
            let ans = tempItems.mapBy('name') 
            alert(ans.join('\n')) 
  
        }, 
        remove() { 
            this.students.shiftObject(); 
        }, 
        check_item(idx) { 
            let temp = this.students 
                .objectAt(JSON.parse(idx)); 
            alert(temp.name) 
        }, 
        check_items(idx1, idx2) { 
            let temp = this.students.slice(idx1, idx2); 
            let ans = temp.mapBy('name') 
            alert(ans.join('\n')) 
        }, 
  
    }, 
});

app/templates/setEach2.hbs

{{page-title "setEach"}} 
<h3>List of Students: </h3> 
  
<table> 
    <tr> 
        <th>Name</th> 
        <th>Class</th> 
        <th>Gender</th> 
        <th>Grade</th> 
        <th>Mobile No.</th> 
    </tr> 
    {{#each @model as |student|}} 
    <tr> 
        <td>{{student.name}}</td> 
        <td>{{student.class}}</td> 
        <td>{{student.gender}}</td> 
        <td>{{student.grade}}</td> 
        <td>{{student.mobile}}</td> 
    </tr> 
    {{/each}} 
</table> 
<br /><br /> 
<div> 
    <label>Enter first index: </label> 
    {{input value=this.temp}} 
</div> 
<div> 
    <label>Enter last indexs: </label> 
    {{input value=this.temp2}} 
</div> 
<input 
    type="button"
    id="check-atIndex"
    value="Slice list"
    {{action "check_items" this.temp this.temp2}} 
/> 
<br /><br /> 
<input 
    type="button"
    id="remove-last"
    value="Remove First Student"
    {{action "remove"}} 
/> 
<br /><br /> 
<input 
    type="button"
    id="hide-number"
    value="Hide Mobile Numbers"
    {{action "hide"}} 
/> 
<br /><br /> 
<input 
    type="button"
    id="all-pass"
    value="Show All Passed Stuedents"
    {{action "allPass"}} 
/> 
  
<br /><br /> 
<input 
    type="button"
    id="select-student"
    value="Select One Student Of Each class"
    {{action "select"}} 
/> 
{{outlet}}