极客教程Ember.js MutableArray setObjects() 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框架之一，旨在加快开发速度并提高生产力。目前，许多网站使用Ember.js，包括Square、Discourse、Groupon、LinkedIn、Live Nation、Twitch和Chipotle。
setObjects() 方法 用参数的内容替换接收器的所有内容。
语法：
setObjects(obj)
参数：
- obj: 要替换成的对象。
返回值： 新数组。
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，您需要先安装ember-cli。在终端中输入以下代码：
npm install ember-cli
现在你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以查看输出
示例2
在此示例中，输入以下代码以生成路线：
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
{{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/movie 查看输出
参考: https://api.emberjs.com/ember/4.4/classes/MutableArray/methods