极客教程Ember.js EmberArray rejectBy()方法
Ember.js 是一个基于Model-View-Controller（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Ember.js，包括Square、Discourse、Groupon、Linked In、Live Nation、Twitch和Chipotle。
rejectBy()方法返回一个包含某个给定键的值为false的对象的数组。
语法：
rejectBy(key,value)
参数：
- key： 要测试的属性。
- value： 要检查的可选值。
返回值： 新数组。
安装和运行Ember.js的步骤：
步骤1： 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。在终端中编写以下代码：
npm install ember-cli
步骤2： 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，请输入:
ember serve
示例1
输入以下代码来生成此示例的路由：
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: "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);
}
}
app/controllers/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);
},
},
});
app/template/details.hbs
{{page-title "Websites"}}
<h3>Websites</h3>
<br /><br />
<table>
<tr>
<th>Name</th>
<th>Website Link</th>
</tr>
{{#each @model as |website|}}
<tr>
<td>{{website.name}}</td>
<td>{{website.link}}</td>
</tr>
{{/each}}
</table>
<br /><br />
<input type="button" id="add-website"
value="More Websites" {{action "add"}} />
<br /><br />
<input type="button" id="set-website"
value="Click Here" {{action "set"}} />
{{outlet}}
输出： 访问 localhost:4200/details 来查看输出结果
示例2
输入以下代码生成此示例的路径：
ember generate route richest-people
app/routes/richest-people.js
import Route from "@ember/routing/route";
import { sortBy } from "@ember/array";
export default class RichestPeopleRoute extends Route {
richestPeople = [
{ name: "mukesh ambani", netWorth: 90.7,
isFamily: false },
{ name: "jeff Bezos", netWorth: 148.1,
isFamily: false },
{ name: "Warren Buffet", netWorth: 99.3,
isFamily: false },
{ name: "Bill gates", netWorth: 104.7,
isFamily: false },
{ name: "elon Musk", netWorth: 253.4,
isFamily: false },
{ name: "gautam adani and family",
netWorth: 115.8, isFamily: true },
{ name: "Larry Page", netWorth: 93.4,
isFamily: false },
{ name: "larryEllison", netWorth: 103.3,
isFamily: false },
{ name: "sergeyBrin", netWorth: 89.9,
isFamily: false },
{ name: "bernard Arnault and family",
netWorth: 157.1, isFamily: true },
];
firstPerson;
lastPerson;
idx = 5;
randomPerson;
num;
model() {
this.richestPeople =
this.richestPeople.sortBy("netWorth");
this.randomPerson =
this.richestPeople[this.idx - 1];
return this.richestPeople;
}
setupController(controller, model) {
super.setupController(controller, model);
controller.set("idx", this.idx);
controller.set("firstPerson", this.richestPeople.firstObject);
controller.set("lastPerson", this.richestPeople.lastObject);
controller.set("randomPerson", this.randomPerson);
controller.set("richestPeople", this.richestPeople);
controller.set("num", this.richestPeople.length);
}
}
app/controllers/richest-people.js
import Ember from "ember";
export default Ember.Controller.extend({
actions: {
check(num) {
num = parseFloat(num);
let res = this.richestPeople.any((person) =>
person.netWorth >= num);
alert(`${res ? "YES" : "NO"}`);
},
getFamilyBusiness() {
let tempItems =
this.richestPeople.rejectBy("isFamily", false);
let str = "";
for (let i = 0; i < tempItems.length; i++)
str += tempItems[i].name + "\n";
alert(str);
},
},
});
app/template/richest-people.hbs
{ { page - title "Richest People" } }
<h2>Richest People in the World</h2>
<table style="border: 2px solid black;padding: 30px;">
<tr>
<th>Name</th>
<th>Net Worth (in billions $)</th>
</tr>
{{#each @model as |person|}}
<tr>
<td>{{person.name}}</td>
<td>{{person.netWorth}}</td>
</tr>
{{/each}}
</table>
<br /><br />
<div>
<label>Enter Value: </label>
{{input value=this.num}}
</div>
<div>
<input
type="button"
id="check"
value="Contains Person With More Net Worth"
{{action "check" this.num}}
/>
</div>
<br /><br />
<input
type="button"
id="get-family"
value="Get Family Business"
{{action "getFamilyBusiness"}}
/>
{{outlet}}
输出: 访问 localhost:4200/richest-people 查看输出:
参考： https://api.emberjs.com/ember/4.6/classes/EmberArray/methods/