当前位置: 首页>>代码示例 >>用法及示例精选 >>正文

Embeer.js Ember.NativeArray findBy()用法及代码示例


Ember.js 是一个开源 JavaScript 框架，用于开发基于 Model-View-Controller (MVC) 架构的大型客户端 Web 应用程序。 Ember.js是使用最广泛的前端应用框架之一。它的目的是加速开发并提高生产力。目前，它被大量网站使用，包括 Square、Discourse、Groupon、Linked In、Live Nation、Twitch 和 Chipotle。

findBy()方法用于获取第一个与属性值匹配的对象。

用法:

findBy( key, value );

参数：

  • key: 这是我们要过滤的属性的名称。
  • value: 它是与属性匹配的可选值。

返回值：找到项目或未定义。

安装和运行 Ember.js 的步骤：

要运行以下示例，您需要有一个 ember 项目。要创建一个，您需要先安装ember-cli。在终端中写入以下代码：

npm install ember-cli

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：键入以下代码以生成本示例的路由：

ember generate route findBy1
  • 应用程序/路线/findBy1.js

Javascript


import Route from "@ember/routing/route";
import EmberObject from '@ember/object';
import EmberResolver from "ember-resolver";
export default class DetailsRoute extends Route {
 details = [
        EmberObject.create({
            name: "Anubhav",
            mobile: "1298119967",
            city: "Patna",
            country: "India",
            gender: "M",
            zipCode: "800020",
        }),
        EmberObject.create({
            name: "Yogesh",
            mobile: "1234567890",
            city: "Raipur",
            country: "India",
            gender: "M",
            zipCode: "402001",
        }),
        EmberObject.create({
            name: "Satyam",
            mobile: "2222222222",
            city: "Delhi",
            country: "India",
            gender: "M",
            zipCode: "110012",
        }),
        EmberObject.create({
            name: "Shivam",
            mobile: "1122113322",
            city: "Patna",
            country: "India",
            gender: "M",
            zipCode: "530068",
        }),
        EmberObject.create({
            name: "Ayushi",
            mobile: "2244668800",
            city: "Jaipur",
            country: "India",
            gender: "F",
            zipCode: "302001",
        }),
    ];
    city;
    start;
    end;
    model() {
        return this.details;
    }
    setupController(controller, model) {
        super.setupController(controller, model);
        controller.set("details", this.details);
        controller.set("city", this.city);
        controller.set("start", this.start);
        controller.set("end", this.end);
    }
}
  • 应用程序/控制器/findBy1.js

Javascript


import Ember from "ember";
import { getProperties } from '@ember/object';
export default Ember.Controller.extend({
    actions: {
        getNames() {
            let ans = this.details.getEach('name');
            alert(ans.join('\n'));
        },
        get_city(data) {
            let temp = this.details.findBy('city', data);
            alert(temp ? `${temp.name} from ${data}` 
                : `No one from ${data}`)
        },
        get_emp(data) {
            let temp = '';
            let ans = this.details.forEach(
                (item) => temp += JSON.stringify(
                    item.getProperties('zipCode')) + '\n')
            alert(temp)
        },
        checkFemale() {
            let res = this.details.any(
                (emp) => emp.gender == 'F');
            alert(res ? `Female employee present in List` 
                : `No Female present`);
        },
    },
});
  • 应用程序/模板/findBy1.hbs

Javascript


{{page-title "findBy"}}
<h3>List of People: </h3>
<br /><br />
<table>
    <tr>
        <th>Name</th>
        <th>Gender</th>
        <th>Mobile</th>
        <th>City</th>
        <th>Country</th>
        <th>Zip Code</th>
    </tr>
    {{#each @model as |detail|}}
    <tr>
        <td>{{detail.name}}</td>
        <td>{{detail.gender}}</td>
        <td>{{detail.mobile}}</td>
        <td>{{detail.city}}</td>
        <td>{{detail.country}}</td>
        <td>{{detail.zipCode}}</td>
    </tr>
    {{/each}}
</table>
<br/>
<div>
    <label>Enter City:</label>
    {{input value = this.temp1}}
</div>
<div>
    <input type="button" id = "check_city"
    value="Get First Employee from city"
    {{action 'get_city' this.temp1}} />
</div>
<br/>
<div>
    <input type="button" id = "get_zip"
    value="Get All zipCode"
    {{action 'get_emp'}} />
</div>
<br/>
<div>
    <input type="button" id="check-female"
        value="Check Female"
        {{action 'checkFemale'}} />
</div>
<br />
<input type="button" id="get-names"
    value="Get All names from list"
    {{action 'getNames' }} />
{{outlet}}

输出：访问 localhost:4200findBy/1 查看输出

Ember.js Ember.NativeArray findBy 方法

示例 2：键入以下代码以生成本示例的路由：

ember generate route findBy2
  • 应用程序/路线/findBy2.js

Javascript


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'
        })
    ];
    model() {
        return this.fruits;
    }
    setupController(controller, model) {
        super.setupController(controller, model);
        controller.set('fruits', this.fruits);
    }
}
  • 应用程序/控制器/findBy2.js

Javascript


import Ember from "ember";
import { isAny, isEvery } from "@ember/array";
export default Ember.Controller.extend({
    actions: {
        check_item(data) {
            let ans = this.fruits.find(
                (item) => item.name == data)
            alert(ans ? "Yes item present in list"
                : "No Item is not present in list");
        },
        checkVegy() {
            let ans = this.fruits.any(
                (item) => item.isFruit == false);
            alert(ans ? "Yes Vegetable present in list"
                : "No Vegetable present in list");
        },
        Fruits() {
            let res = '';
            let ans = this.fruits.findBy('isFruit', true);
            let temp = ans.forEach(
                (item) => res += item.getProperties('name').name + '\n')
            alert(res)
        },
        print() {
            let ans = this.fruits.getEach('name');
            alert(ans.join('\n'));
        },
    },
});
  • 应用程序/模板/findBy2.hbs

Javascript


{{page-title "findBy"}}
<h3>Here is a list of eatables: </h3>
<ul>
    {{#each this.fruits as |eatable|}}
    <li>
        {{eatable.name}}
    </li>
    {{/each}}
</ul>
<br/>
<div>
    <label>Enter item:</label>
    {{input value = this.temp1}}
</div>
<div>
    <input type="button" id = "check_item"
    value="Check Item in list"
    {{action 'check_item' this.temp1}} />
</div>
<br/>
<input type="button"
    id="fruit-show"
    value="Check Fruits"
    {{action 'showFruit'}}/>
<br/><br/>
<input type="button"
    id="check-vegy"
    value="Any Vegetable in List"
    {{action 'checkVegy'}}/>
<br/><br/>
<input type="button"
    id="check-Fruits"
    value="Find First Fruit in Bucket"
    {{action 'Fruits'}}/>
<br/><br/>
<input type="button"
    id="check-NonFruits"
    value="List all Items"
    {{action 'print'}}/>
{{outlet}}

输出：访问 localhost:4200/findBy2 查看输出

Ember.js Ember.NativeArray findBy 方法

参考： https://api.emberjs.com/ember/4.4/classes/Ember.NativeArray/methods/findBy?anchor=findBy



相关用法


注：本文由纯净天空筛选整理自satyam00so大神的英文原创作品 Ember.js Ember.NativeArray findBy() Method。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。