极客教程Ember.js EmberObject getProperties() 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是目前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，它被许多网站使用，包括Square、Discourse、Groupon、领英、Live Nation、Twitch和Chipotle等。
getProperties() 方法用于一次获取多个属性的值。
语法：
getProperties( list );
参数：
- list： 获取的键的数组。
返回值： 对象。
步骤1： 要运行以下示例，您需要拥有一个 ember 项目。要创建一个项目，您需要首先安装 ember-cli。将以下代码写入终端：
npm install ember-cli
步骤2： 现在你可以通过输入以下代码来创建项目：
ember new <project-name> --lang en
启动服务器，请输入：
ember serve
示例1： 在以下代码中输入，以生成此示例的路线：
ember generate route getProperties1
app/routes/getProperties1.js
import Route from '@ember/routing/route';
import EmberObject from '@ember/object';
import { } from '@ember/array';
export default class FruitsRoute extends Route {
fruits = [
EmberObject.create({ name: 'Lady Finger',
isFruit: false, color: 'green' }),
EmberObject.create({ name: 'Brinjal',
isFruit: false, color: 'purple' }),
EmberObject.create({ name: 'Apple',
isFruit: true, color: 'red' }),
EmberObject.create({ name: 'Grapes',
isFruit: true, color: 'green' }),
EmberObject.create({ name: 'Mango',
isFruit: true, color: 'yellow' }),
EmberObject.create({ name: 'Watermelon',
isFruit: true, color: 'red' }),
EmberObject.create({ name: 'Orange',
isFruit: true, color: 'orange' })
];
fruits2 = [
EmberObject.create({ name: 'Potato',
isFruit: false, color: 'brown' }),
EmberObject.create({ name: 'Tomato',
isFruit: false, color: 'red' }),
EmberObject.create({ name: 'Banana',
isFruit: true, color: 'Yellow' }),
EmberObject.create({ name: 'Water-melon',
isFruit: true, color: 'green' }),
EmberObject.create({ name: 'Papaya',
isFruit: true, color: 'yellow' }),
];
model() {
return this.fruits;
}
setupController(controller, model) {
super.setupController(controller, model);
controller.set('fruits', this.fruits);
controller.set('fruits2', this.fruits2);
}
}
app/controllers/getProperties1.js
import Ember from "ember";
import { isAny, isEvery } from "@ember/array";
export default Ember.Controller.extend({
actions: {
print() {
let ans = '';
this.fruits.forEach((item) => ans +=
item.getProperties('name').name + '\n');
alert(ans);
},
Change() {
let ans = this.fruits.forEach((item, i) =>
item.setProperties(this.fruits2.at(i)));
},
toggle() {
this.fruits.forEach((item) =>
item.toggleProperty('isFruit'));
},
},
});
app/templates/getProperties1.hbs
{{page-title "getProperties"}}
<h3>Here is a list of eatables: </h3>
<br /><table>
<tr>
<th>Name</th>
<th>isFruit</th>
<th>color</th>
</tr>
{{#each @model as |detail|}}
<tr>
<td>{{detail.name}}</td>
<td>{{detail.isFruit}}</td>
<td>{{detail.color}}</td>
</tr>
{{/each}}
</table>
<br />
<input type="button"
id="list-item"
value="List all Items"
{{action "print"}} />
<br /><br />
<input
type="button"
id="change-item"
value="Change all Item in Bucket"
{{action "Change"}}
/>
<br /><br />
<input
type="button"
id="toggle-isFruits"
value="Toggle isFruit Properties"
{{action "toggle"}}
/>
{{outlet}}
输出： 访问localhost:4200/getProperties1以查看输出。
示例2： 输入以下代码以生成此示例的路由：
ember generate route getProperties2
app/routes/getProperties2.js
import Route from '@ember/routing/route';
import EmberObject from '@ember/object';
export default class WebsitesRoute extends Route {
food = [
EmberObject.create({
food: 'apple',
isFruit: true,
buck: '1',
}),
EmberObject.create({
food: 'Potato',
isFruit: false,
buck: '2',
}),
EmberObject.create({
food: 'Banana',
isFruit: true,
buck: '1',
}),
EmberObject.create({
food: 'Burgur',
isFruit: false,
buck: '2',
}),
EmberObject.create({
food: 'Orange',
isFruit: true,
buck: '1',
}),
];
food2 = [
EmberObject.create({ food: 'sandwitch',
isFruit: false, buck: '2', }),
EmberObject.create({ food: 'bean',
isFruit: false, buck: '2', }),
EmberObject.create({ name: 'Banana',
isFruit: true, buck: 1 }),
EmberObject.create({ name: 'Water-melon',
isFruit: true, buck: 2 }),
EmberObject.create({ name: 'Papaya',
isFruit: true, buck: 1 }),
,
,
];
temp;
model() {
return this.food;
}
setupController(controller, model) {
super.setupController(controller, model);
controller.set('food', this.food);
controller.set('temp', this.temp);
controller.set('food2', this.food2);
}
}
app/controllers/getProperties2.js
import Ember from 'ember';
export default Ember.Controller.extend({
value: 0,
actions: {
List() {
let ans = '';
this.food.forEach((item)=>
ans+=item.getProperties('food').food+'
is in Bucket '+ item.getProperties
('buck').buck+'\n');
alert(ans);
},
Bucket2() {
this.food.forEach((item, i)=>
item.setProperties(this.food2.at(i)));
},
toggle2() {
this.food.forEach((item, i)=>
item.toggleProperty('isFruit'));
},
},
});
app/templates/getProperties2.hbs
{{page-title "getProperties"}}
<h3>List of Item in Buckets</h3>
<table>
<tr>
<th> Food Name </th>
<th>Bucket </th>
<th>Fruit </th>
</tr>
{{#each @model as |website|}}
<tr>
<td>{{website.food}}</td>
<td>{{website.buck}}</td>
<td>{{website.isFruit}}</td>
</tr>
{{/each}}
</table>
<br /><br />
<input
type="button"
id="increase"
value="List All items with Bucket number"
{{action "List"}}
/>
<br /><br />
<input
type="button"
id="update-list"
value="List another Bucket item"
{{action "Bucket2"}}
/>
<br /><br />
<input
type="button"
id="toggle-property"
value="Toggle Fruit Property"
{{action "toggle2"}}
/>
{{outlet}}
输出： 访问localhost:4200/getProperties2以查看输出。
参考： https://api.emberjs.com/ember/4.4/classes/EmberObject/methods/getProperties?anchor=getProperties