极客教程Ember.js ArrayProxy removeObjects() 方法
Ember.js 是一个基于模型-视图-控制器（MVC）架构用于开发大型客户端网页应用的开源JavaScript框架。Ember.js是最广泛使用的前端应用框架之一，它旨在加速开发并提高生产力。目前它被许多网站使用，包括Square、Discourse、Groupon、LinkedIn、Live Nation、Twitch和Chipotle。
removeObjects() 方法从给定数组中移除每个提供的项。
语法：
removeObjects(objs)
参数：
- objs： 要删除的对象
返回值： 数组
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，您首先需要安装 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 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",
];
itemString;
itemList;
start;
end;
helper(itemString) {
this.itemList = itemString.split(",");
for (let i = 0; i < this.itemList.length; i++)
this.itemList[i] = this.itemList[i].trim();
return this.itemList;
}
model() {
return this.partyItems;
}
setupController(controller, model) {
this._super(controller, model);
controller.set("helper", this.helper);
controller.set("partyItems", this.partyItems);
controller.set("itemString", this.itemString);
controller.set("itemList", this.itemList);
controller.set("start", this.start);
controller.set("end", this.end);
}
}
app/controllers/party.js
import Ember from "ember";
import {
objectsAt,
removeObject,
removeObjects,
slice,
reverseObjects,
setObjects,
reject,
} from "@ember/array";
export default Ember.Controller.extend({
actions: {
getItems(itemString) {
this.itemList = this.helper(itemString);
for (let i = 0; i < this.itemList.length; i++)
this.itemList[i] = parseInt(this.itemList[i]);
let tempItems =
this.partyItems.objectsAt(this.itemList);
let str = "";
for (let i = 0; i < tempItems.length; i++)
str += tempItems[i] + "\n";
alert(str);
},
removeItems(itemString) {
this.itemList = this.helper(itemString);
if (this.itemList.length == 1)
this.partyItems.removeObject(this.itemList[0]);
else this.partyItems.removeObjects(this.itemList);
this.set("itemString", "");
},
sliceItems(start, end) {
let tempItems = this.partyItems.slice(start, end);
let str = "";
for (let i = 0; i < tempItems.length; i++)
str += tempItems[i] + "\n";
alert(str);
},
reverseItems() {
this.set("partyItems",
this.partyItems.reverseObjects());
},
replaceItems(itemString) {
this.partyItems.setObjects(this.helper(itemString));
},
findMultiwordItems() {
let reqItem = this.partyItems.reject(
(item) => item.split(" ").toArray().length == 1
);
alert(reqItem);
},
},
});
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 Items: </label>
{{input value=this.itemString}}
</div>
<div>
<input
type="button"
id="remove-item"
value="Remove Items"
{{action "removeItems" 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="slice"
value="Slice"
{{action "sliceItems" this.start this.end}}
/>
</div>
<br /><br />
<div>
<label>Enter Indices: </label>
{{input value=this.itemString}}
</div>
<div>
<input
type="button"
id="get-item"
value="Get Items"
{{action "getItems" this.itemString}}
/>
</div>
<br /><br />
<div>
<label>Enter Items: </label>
{{input value=this.itemString}}
</div>
<div>
<input
type="button"
id="replace-item"
value="Replace Items"
{{action "replaceItems" this.itemString}}
/>
</div>
<br /><br />
<input
type="button"
id="reverse-items"
value="Reverse"
{{action "reverseItems"}}
/>
<br /><br />
<input
type="button"
id="find-items"
value="Find"
{{action "findMultiwordItems"}}
/>
{{outlet}}
输出: 访问 localhost:4200/party 查看输出
示例2： 输入以下代码以生成此示例的路线：
ember generate route movie
app/routes/movie.js
import Route from "@ember/routing/route";
export default class MovieRoute extends Route {
movies = [
"The Shawshank Redemption",
"The Godfather",
"The Dark Knight",
"Schindler's List",
"The Godfather Part II",
"12 Angry Men",
"Pulp Fiction ",
"Raging Bull",
"Parasite",
"Se7en",
"3 Idiots",
"Forrest Gump",
"The Green Mile",
];
itemString;
itemList;
helper(itemString) {
this.itemList = itemString.split(",");
for (let i = 0; i < this.itemList.length; i++)
this.itemList[i] = this.itemList[i].trim();
return this.itemList;
}
model() {
return this.movies;
}
setupController(controller, model) {
super.setupController(controller, model);
controller.set("helper", this.helper);
controller.set("movies", this.movies);
controller.set("itemString", this.itemString);
controller.set("itemList", this.itemList);
}
}
app/controllers/movie.js
import Ember from "ember";
import {
objectsAt,
removeObject,
removeObjects,
setObjects,
reject,
} from "@ember/array";
export default Ember.Controller.extend({
actions: {
getItems(itemString) {
this.itemList = this.helper(itemString);
for (let i = 0; i < this.itemList.length; i++)
this.itemList[i] = parseInt(this.itemList[i]);
let tempItems = this.movies.objectsAt(this.itemList);
let str = "";
for (let i = 0; i < tempItems.length; i++)
str += tempItems[i] + "\n";
alert(str);
},
removeItems(itemString) {
this.itemList = this.helper(itemString);
if (this.itemList.length == 1)
this.movies.removeObject(this.itemList[0]);
else this.movies.removeObjects(this.itemList);
this.set("itemString", "");
},
replaceItems(itemString) {
this.movies.setObjects(this.helper(itemString));
},
findSingleWordItems() {
let reqItem = this.movies.reject(
(item) => item.split(" ").toArray().length > 1
);
alert(reqItem);
},
},
});
app/template/movie.js
app/template/movie.js
{{page-title "Movie"}}
<h3>Here is a list of Movies: </h3>
<ul>
{{#each @model as |movie|}}
<li>{{movie}}</li>
{{/each}}
</ul>
<br /><br />
<div>
<label>Enter Movies: </label>
{{input value=this.itemString}}
</div>
<div>
<input
type="button"
id="remove-item"
value="Remove Movie"
{{action "removeItems" this.itemString}}
/>
</div>
<br /><br />
<div>
<label>Enter Indices: </label>
{{input value=this.itemString}}
</div>
<div>
<input
type="button"
id="get-item"
value="Get Movies"
{{action "getItems" this.itemString}}
/>
</div>
<br /><br />
<div>
<label>Enter Movies: </label>
{{input value=this.itemString}}
</div>
<div>
<input
type="button"
id="replace-item"
value="Replace Movies"
{{action "replaceItems" this.itemString}}
/>
</div>
<br /><br />
<input
type="button"
id="find-items"
value="Find"
{{action "findSingleWordItems"}}
/>
{{outlet}}
输出： 访问localhost:4200/movie查看输出
参考： https://api.emberjs.com/ember/4.7/classes/ArrayProxy/methods/