HTML HTML国家/地区选择框(英文) Posted 2021-05-24
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<select name="country">
<option>Afghanistan</option>
<option>Albania</option>
<option>Algeria</option>
<option>American Samoa</option>
<option>Andorra</option>
<option>Angola</option>
<option>Anguilla</option>
<option>Antarctica</option>
<option>Antigua and Barbuda</option>
<option>Argentina</option>
<option>Armenia</option>
<option>Aruba</option>
<option>Australia</option>
<option>Austria</option>
<option>Azerbaijan</option>
<option>Bahamas</option>
<option>Bahrain</option>
<option>Bangladesh</option>
<option>Barbados</option>
<option>Belarus</option>
<option>Belgium</option>
<option>Belize</option>
<option>Benin</option>
<option>Bermuda</option>
<option>Bhutan</option>
<option>Bolivia</option>
<option>Bosnia and Herzegovina</option>
<option>Botswana</option>
<option>Bouvet Island</option>
<option>Brazil</option>
<option>British Indian Ocean Territory</option>
<option>Brunei Darussalam</option>
<option>Bulgaria</option>
<option>Burkina Faso</option>
<option>Burundi</option>
<option>Cambodia</option>
<option>Cameroon</option>
<option>Canada</option>
<option>Cape Verde</option>
<option>Cayman Islands</option>
<option>Central African Republic</option>
<option>Chad</option>
<option>Chile</option>
<option>China</option>
<option>Christmas Island</option>
<option>Cocos Islands</option>
<option>Colombia</option>
<option>Comoros</option>
<option>Congo</option>
<option>Congo, Democratic Republic of the</option>
<option>Cook Islands</option>
<option>Costa Rica</option>
<option>Cote d'Ivoire</option>
<option>Croatia</option>
<option>Cuba</option>
<option>Cyprus</option>
<option>Czech Republic</option>
<option>Denmark</option>
<option>Djibouti</option>
<option>Dominica</option>
<option>Dominican Republic</option>
<option>Ecuador</option>
<option>Egypt</option>
<option>El Salvador</option>
<option>Equatorial Guinea</option>
<option>Eritrea</option>
<option>Estonia</option>
<option>Ethiopia</option>
<option>Falkland Islands</option>
<option>Faroe Islands</option>
<option>Fiji</option>
<option>Finland</option>
<option>France</option>
<option>French Guiana</option>
<option>French Polynesia</option>
<option>Gabon</option>
<option>Gambia</option>
<option>Georgia</option>
<option>Germany</option>
<option>Ghana</option>
<option>Gibraltar</option>
<option>Greece</option>
<option>Greenland</option>
<option>Grenada</option>
<option>Guadeloupe</option>
<option>Guam</option>
<option>Guatemala</option>
<option>Guinea</option>
<option>Guinea-Bissau</option>
<option>Guyana</option>
<option>Haiti</option>
<option>Heard Island and McDonald Islands</option>
<option>Honduras</option>
<option>Hong Kong</option>
<option>Hungary</option>
<option>Iceland</option>
<option>India</option>
<option>Indonesia</option>
<option>Iran</option>
<option>Iraq</option>
<option>Ireland</option>
<option>Israel</option>
<option>Italy</option>
<option>Jamaica</option>
<option>Japan</option>
<option>Jordan</option>
<option>Kazakhstan</option>
<option>Kenya</option>
<option>Kiribati</option>
<option>Kuwait</option>
<option>Kyrgyzstan</option>
<option>Laos</option>
<option>Latvia</option>
<option>Lebanon</option>
<option>Lesotho</option>
<option>Liberia</option>
<option>Libya</option>
<option>Liechtenstein</option>
<option>Lithuania</option>
<option>Luxembourg</option>
<option>Macao</option>
<option>Madagascar</option>
<option>Malawi</option>
<option>Malaysia</option>
<option>Maldives</option>
<option>Mali</option>
<option>Malta</option>
<option>Marshall Islands</option>
<option>Martinique</option>
<option>Mauritania</option>
<option>Mauritius</option>
<option>Mayotte</option>
<option>Mexico</option>
<option>Micronesia</option>
<option>Moldova</option>
<option>Monaco</option>
<option>Mongolia</option>
<option>Montenegro</option>
<option>Montserrat</option>
<option>Morocco</option>
<option>Mozambique</option>
<option>Myanmar</option>
<option>Namibia</option>
<option>Nauru</option>
<option>Nepal</option>
<option>Netherlands</option>
<option>Netherlands Antilles</option>
<option>New Caledonia</option>
<option>New Zealand</option>
<option>Nicaragua</option>
<option>Niger</option>
<option>Nigeria</option>
<option>Norfolk Island</option>
<option>North Korea</option>
<option>Norway</option>
<option>Oman</option>
<option>Pakistan</option>
<option>Palau</option>
<option>Palestinian Territory</option>
<option>Panama</option>
<option>Papua New Guinea</option>
<option>Paraguay</option>
<option>Peru</option>
<option>Philippines</option>
<option>Pitcairn</option>
<option>Poland</option>
<option>Portugal</option>
<option>Puerto Rico</option>
<option>Qatar</option>
<option>Romania</option>
<option>Russian Federation</option>
<option>Rwanda</option>
<option>Saint Helena</option>
<option>Saint Kitts and Nevis</option>
<option>Saint Lucia</option>
<option>Saint Pierre and Miquelon</option>
<option>Saint Vincent and the Grenadines</option>
<option>Samoa</option>
<option>San Marino</option>
<option>Sao Tome and Principe</option>
<option>Saudi Arabia</option>
<option>Senegal</option>
<option>Serbia</option>
<option>Seychelles</option>
<option>Sierra Leone</option>
<option>Singapore</option>
<option>Slovakia</option>
<option>Slovenia</option>
<option>Solomon Islands</option>
<option>Somalia</option>
<option>South Africa</option>
<option>South Georgia</option>
<option>South Korea</option>
<option>Spain</option>
<option>Sri Lanka</option>
<option>Sudan</option>
<option>Suriname</option>
<option>Svalbard and Jan Mayen</option>
<option>Swaziland</option>
<option>Sweden</option>
<option>Switzerland</option>
<option>Syrian Arab Republic</option>
<option>Taiwan</option>
<option>Tajikistan</option>
<option>Tanzania</option>
<option>Thailand</option>
<option>The Former Yugoslav Republic of Macedonia</option>
<option>Timor-Leste</option>
<option>Togo</option>
<option>Tokelau</option>
<option>Tonga</option>
<option>Trinidad and Tobago</option>
<option>Tunisia</option>
<option>Turkey</option>
<option>Turkmenistan</option>
<option>Tuvalu</option>
<option>Uganda</option>
<option>Ukraine</option>
<option>United Arab Emirates</option>
<option>United Kingdom</option>
<option>United States</option>
<option>United States Minor Outlying Islands</option>
<option>Uruguay</option>
<option>Uzbekistan</option>
<option>Vanuatu</option>
<option>Vatican City</option>
<option>Venezuela</option>
<option>Vietnam</option>
<option>Virgin Islands, British</option>
<option>Virgin Islands, U.S.</option>
<option>Wallis and Futuna</option>
<option>Western Sahara</option>
<option>Yemen</option>
<option>Zambia</option>
<option>Zimbabwe</option>
</select>
如何加快选择框的性能?
【中文标题】如何加快选择框的性能? 【英文标题】:How to speed up performance of Select Box?
【发布时间】:2018-01-31 12:50:08
【问题描述】:
我试图在ion-select
中显示一长串国家/地区。目前我正在尝试加载 249 个国家/地区。我的手机上的渲染性能非常慢。
<ion-list margin-top margin-bottom>
<ion-item>
<ion-label margin-left style="color:#3498db">Country</ion-label>
<ion-select margin-right [(ngModel)]="country" okText="Done" placeholder="Select">
<ion-option *ngFor="let item of countries" [value]="item.ccode" [selected]="country == item.ccode">item.cname</ion-option>
</ion-select>
</ion-item>
</ion-list>
有什么方法可以提高渲染性能?
【问题讨论】:
您从哪里获得249
记录?
@Sampath 来自我的服务器
如果以下解决方案有效,则没有问题。但您也可以寻求缓存解决方案。即您可以将这些国家/地区存储在您的设备上。
【参考方案1】:
最好的方法是使用Modal
。您还可以在顶部添加一个搜索栏,以便用户可以轻松找到目标国家。以下只是一个简化的演示(如果您发现任何错误,请告诉我,因为我已经从中删除了很多不相关的代码)。
还请注意,我在视图中使用常规 div
,而不是每个国家/地区使用 ion-list
和 ion-item
。 这是因为国家/地区列表很友好大(〜250),并使用来自Ionic(基于Angular)的组件ion-list
和ion-item
将需要初始化这些组件,渲染它们,然后在每次过滤国家时创建/销毁它们. 在演示中,由于它们只是 html 元素(带有一些简单的样式规则),因此即使在非常旧的移动设备上性能也很好。
控制器
// Angular
import Component from '@angular/core';
// Ionic
import NavParams, ViewController from 'ionic-angular';
@Component(
selector: 'page-country-list',
templateUrl: 'country-list.html'
)
export class CountryListPage
public countries: Array<any>;
public countriesToShow: Array<any>;
constructor(private paramsCtrl: NavParams, private viewCtrl: ViewController)
// Get the data as a parameter
this.countries = paramsCtrl.get('countries');
// Initialize the list of countries to show in the view
this.initializeCountriesToShow();
public initializeCountriesToShow(): void
// Clone the list of countries so we don't modify the original copy
this.countriesToShow = [...this.countries];
public filterCountries(ev: any): void
// Reset countries back to all of the countries
this.initializeCountriesToShow();
// Set val to the value of the searchbar
let val = ev.target.value;
// If the value is an empty string don't filter the countries
if (val && val.trim() != '')
this.countriesToShow = this.countriesToShow.filter((country) =>
return (country.name.toLowerCase().indexOf(val.toLowerCase()) > -1);
)
// Method that returns the selected country to the caller
public selectCountry(country: any): void
this.viewCtrl.dismiss(country);
// Method that closes the modal without returning anything
public close(): void
this.viewCtrl.dismiss();
查看
<ion-header>
<ion-navbar color="primary">
<ion-title>Countries</ion-title>
<ion-buttons right>
<button (click)="close()" ion-button icon-only>
<ion-icon color="light" class="close-icon" name="close"></ion-icon>
</button>
</ion-buttons>
</ion-navbar>
<ion-toolbar color="primary">
<ion-searchbar placeholder="Type the name here..." (ionInput)="filterCountries($event)"></ion-searchbar>
</ion-toolbar>
</ion-header>
<ion-content padding>
<div class="country-list">
<div tappable (click)="selectCountry(country)" class="country-item" *ngFor="let country of countriesToShow">
country.name
</div>
</div>
</ion-content>
样式
.ios, .md
page-country-list
div.country-item
position: relative;
margin-right: 16px;
margin-left: 16px;
margin-top: 16px;
padding-bottom: 16px;
border-bottom: 0.55px solid map-get($colors, light);
&:last-child
border-bottom: none;
ion-navbar
.close-icon
font-size: 3.5rem;
padding-right: 8px;
调用者组件
然后,为了显示模态,您可以执行以下操作:
constructor(private modalController: ModalController)
// ...
public showCountryDropdown(): void
// Create the modal
let modal = this.modalCtrl.create('CountryListPage');
// Handle the result
modal.onDidDismiss(country =>
if (country)
// Handle the selected country
// ...
);
// Show the modal
modal.present();
注意 :在演示中,我假设每个country
项目都有一个属性name
。
【讨论】:
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