Web Front-endHTML TutorialAsk for advice: How to nest another drop down list inside a drop down list and get the value_html/css_WEB-ITnose
I recently encountered a technical problem during web front-end development, but I couldn’t find a solution. I would like to ask: How to implement a "parent" drop on the web client side? Nest another "child" drop down list inside the down list and pass the value of the sub-drop-down menu to the upper-level drop-down menu and output
Reply to discussion (solution)
1. The outer drop down list is simulated through other elements such as div
2. Redesign it to make it more reasonable. This situation can be like the common selection of provinces. Select the city and other related options like that
Thank you friends upstairs. Since my experience is very limited, I wonder if I can provide some examples or give a link for reference.
Thank you!
The current situation is as follows:
(1) Running abnormally on firefox;
(2) The value taken from the child dropdownlist, I don’t know how to assign it to the previous dropdownlist (That is, the parent dropdownlist simulated by css and div)
The exercise source code is as follows:
demo.html
<!DOCTYPE html><html lang="en"> <head> <meta charset="UTF-8" /> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Custom Drop-Down List Styling</title> <link rel="stylesheet" type="text/css" href="style.css" /> <link href='http://fonts.googleapis.com/css?family=Lato:300,400,700' rel='stylesheet' type='text/css' /> <script type="text/javascript" src="modernizr.custom.79639.js"></script> <noscript><link rel="stylesheet" type="text/css" href="noJS.css" /></noscript> </head> <body> <div class="container"> <!-- Codrops top bar --> <div class="codrops-top"></div><!--/ Codrops top bar --> <header> <h1 id="nbsp"> </h1> <h2 id="nbsp"> </h2> <nav class="codrops-demos"></nav> </header> <section class="main"> <div class="wrapper-demo"> <div id="dd" class="wrapper-dropdown-1" tabindex="1"> <span>Select Contact</span> <ul class="dropdown" tabindex="1"> <li><a href="#"> <form> <select id="myselect"> <option value="1">Ed Bradley</option> <option value="2">Contact2</option> <option value="3">Contact3</option> </select> </form> </a> </li> <li><a href="#"> <form> <select id="myselect"> <option value="0">Select a Saved List</option> <option value="1">List1</option> <option value="2">List2</option> <option value="3">List3</option> </select> </form> </a> </li> <li><a href="#">Active Search - 200 Contacts</a></li> <li><a href="#">All Contacts - 70000 Contacts</a></li> </ul> </div> ?</div> </section> </div> <!-- jQuery if needed --> <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script> <script type="text/javascript"> function DropDown(el) { this.dd = el; this.placeholder = this.dd.children('span'); this.opts = this.dd.find('ul.dropdown > li'); this.val = ''; this.index = -1; this.initEvents(); } DropDown.prototype = { initEvents : function() { var obj = this; obj.dd.on('click', function(event){ $(this).toggleClass('active'); return false; }); obj.opts.on('click',function(){ var opt = $(this); obj.val = opt.text(); obj.index = opt.index(); obj.placeholder.text('Select Contact: ' + obj.val); }); }, getValue : function() { return this.val; }, getIndex : function() { return this.index; } } $(function() { var dd = new DropDown( $('#dd') ); $(document).click(function() { // all dropdowns $('.wrapper-dropdown-1').removeClass('active'); }); }); </script> </body></html> style.css
@import url('demo.css');@import url('font-awesome.css');/* GLOBALS */*,*:after,*:before { -webkit-box-sizing: border-box; -moz-box-sizing: border-box; box-sizing: border-box; padding: 0; margin: 0;}::selection { background: transparent; }::-moz-selection { background: transparent; }.wrapper-demo { margin: 60px 0 0 0; *zoom: 1; font-weight: 400;}.wrapper-demo:after { clear: both; content: ""; display: table;}/* DEMO 1 */.wrapper-dropdown-1 { /* Size and position */ position: relative; /* Enable absolute positionning for children and pseudo elements */ width: 400px; padding: 10px; margin: 0 auto; /* Styles */ background: #9bc7de; color: #fff; outline: none; cursor: pointer; /* Font settings */ font-weight: bold;}.wrapper-dropdown-1:after { content: ""; width: 0; height: 0; position: absolute; right: 16px; top: 50%; margin-top: -6px; border-width: 6px 0 6px 6px; border-style: solid; border-color: transparent #fff; }.wrapper-dropdown-1 .dropdown { /* Size & position */ position: absolute; top: 100%; left: 0; right: 0; /* Styles */ background: #fff; list-style: none; font-weight: normal; /* Cancels previous font-weight: bold; */ /* Hiding */ opacity: 0; pointer-events: none;}.wrapper-dropdown-1 .dropdown li a { display: block; text-decoration: none; color: #9e9e9e; padding: 10px 20px;}/* Hover state */.wrapper-dropdown-1 .dropdown li:hover a { background: #f3f8f8;}/* Active state */.wrapper-dropdown-1.active .dropdown { opacity: 1; pointer-events: auto;}.wrapper-dropdown-1.active:after { border-color: #9bc7de transparent; border-width: 6px 6px 0 6px ; margin-top: -3px;}.wrapper-dropdown-1.active { background: #9bc7de; background: -moz-linear-gradient(left, #9bc7de 0%, #9bc7de 78%, #ffffff 78%, #ffffff 100%); background: -webkit-gradient(linear, left top, right top, color-stop(0%,#9bc7de), color-stop(78%,#9bc7de), color-stop(78%,#ffffff), color-stop(100%,#ffffff)); background: -webkit-linear-gradient(left, #9bc7de 0%,#9bc7de 78%,#ffffff 78%,#ffffff 100%); background: -o-linear-gradient(left, #9bc7de 0%,#9bc7de 78%,#ffffff 78%,#ffffff 100%); background: -ms-linear-gradient(left, #9bc7de 0%,#9bc7de 78%,#ffffff 78%,#ffffff 100%); background: linear-gradient(to right, #9bc7de 0%,#9bc7de 78%,#ffffff 78%,#ffffff 100%); filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#9bc7de', endColorstr='#ffffff',GradientType=1 );}/* No CSS3 support */.no-opacity .wrapper-dropdown-1 .dropdown,.no-pointerevents .wrapper-dropdown-1 .dropdown { display: none; opacity: 1; /* If opacity support but no pointer-events support */ pointer-events: auto; /* If pointer-events support but no pointer-events support */}.no-opacity .wrapper-dropdown-1.active .dropdown,.no-pointerevents .wrapper-dropdown-1.active .dropdown { display: block;} demo.css
/* General Demo Style */body { font-family: 'Lato', 'Arial', sans-serif; background: #ddd url(../images/bg.jpg); font-weight: 300; font-size: 15px; color: #333; -webkit-font-smoothing: antialiased; overflow-y: scroll; overflow-x: hidden;}a { color: #555; text-decoration: none;}.container { width: 100%; position: relative;}.clr { clear: both; padding: 0; height: 0; margin: 0;}.main { width: 90%; margin: 0 auto; position: relative;}.container > header { margin: 10px; padding: 20px 10px 10px 10px; position: relative; display: block; text-shadow: 1px 1px 1px rgba(0,0,0,0.2); text-align: center;}.container > header h1 { font-size: 30px; line-height: 38px; margin: 0; position: relative; font-weight: 300; color: #666; text-shadow: 1px 1px 1px rgba(255,255,255,0.7);}.container > header h2 { font-size: 14px; font-weight: 300; margin: 0; padding: 15px 0 5px 0; color: #888; font-family: Cambria, Georgia, serif; font-style: italic; text-shadow: 1px 1px 1px rgba(255,255,255,0.9);}/* Header Style */.codrops-top { line-height: 24px; font-size: 11px; background: #fff; background: rgba(255, 255, 255, 0.5); text-transform: uppercase; z-index: 9999; position: relative; font-family: Cambria, Georgia, serif; box-shadow: 1px 0px 2px rgba(0,0,0,0.2);}/* Clearfix hack by Nicolas Gallagher: http://nicolasgallagher.com/micro-clearfix-hack/ */.codrops-top:before,.codrops-top:after { content: " "; /* 1 */ display: table; /* 2 */}.codrops-top:after { clear: both}.codrops-top a { padding: 0px 10px; letter-spacing: 1px; color: #333; display: inline-block;}.codrops-top a:hover { background: rgba(255,255,255,0.6);}.codrops-top span.right { float: right;}.codrops-top span.right a { float: left; display: block;}/* Demo Buttons Style */.codrops-demos { text-align:center; display: block; line-height: 30px; padding: 5px 0px;}.codrops-demos a { display: inline-block; margin: 0px 4px; padding: 0px 6px; color: #aaa; line-height: 20px; font-size: 12px; font-weight: 700; text-shadow: 1px 1px 1px #fff; border: 1px solid #fff; background: #ffffff; /* Old browsers */ background: -moz-linear-gradient(top, #ffffff 0%, #f6f6f6 47%, #ededed 100%); /* FF3.6+ */ background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#ffffff), color-stop(47%,#f6f6f6), color-stop(100%,#ededed)); /* Chrome,Safari4+ */ background: -webkit-linear-gradient(top, #ffffff 0%,#f6f6f6 47%,#ededed 100%); /* Chrome10+,Safari5.1+ */ background: -o-linear-gradient(top, #ffffff 0%,#f6f6f6 47%,#ededed 100%); /* Opera 11.10+ */ background: -ms-linear-gradient(top, #ffffff 0%,#f6f6f6 47%,#ededed 100%); /* IE10+ */ background: linear-gradient(top, #ffffff 0%,#f6f6f6 47%,#ededed 100%); /* W3C */ filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#ffffff', endColorstr='#ededed',GradientType=0 ); /* IE6-9 */ box-shadow: 0 1px 1px rgba(0, 0, 0, 0.1);}.codrops-demos a:hover { color: #333; background: #fff;}.codrops-demos a:active { background: #fff;}.codrops-demos a.current-demo,.codrops-demos a.current-demo:hover { background: #f0f0f0; border-color: #d9d9d9; color: #aaa; box-shadow: 0 1px 0 rgba(255,255,255,0.3); filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#f6f6f6', endColorstr='#f6f6f6',GradientType=0 ); /* IE6-9 */}.support-note span { color: #ac375d; font-size: 16px; display: none; font-weight: bold; text-align: center; padding: 5px 0;}.no-cssanimations .support-note span.no-cssanimations,.no-csstransforms .support-note span.no-csstransforms,.no-csstransforms3d .support-note span.no-csstransforms3d,.no-csstransitions .support-note span.no-csstransitions { display: block;} noJS.css
/* DEMO 1 */.wrapper-dropdown-1:focus .dropdown { opacity: 1; pointer-events: auto;}.wrapper-dropdown-1:focus:after { border-color: #9bc7de transparent; border-width: 6px 6px 0 6px ; margin-top: -3px;} 
Difficulty in updating caching of official account web pages: How to avoid the old cache affecting the user experience after version update?Mar 04, 2025 pm 12:32 PMThe official account web page update cache, this thing is simple and simple, and it is complicated enough to drink a pot of it. You worked hard to update the official account article, but the user still opened the old version. Who can bear the taste? In this article, let’s take a look at the twists and turns behind this and how to solve this problem gracefully. After reading it, you can easily deal with various caching problems, allowing your users to always experience the freshest content. Let’s talk about the basics first. To put it bluntly, in order to improve access speed, the browser or server stores some static resources (such as pictures, CSS, JS) or page content. Next time you access it, you can directly retrieve it from the cache without having to download it again, and it is naturally fast. But this thing is also a double-edged sword. The new version is online,
How do I use HTML5 form validation attributes to validate user input?Mar 17, 2025 pm 12:27 PMThe article discusses using HTML5 form validation attributes like required, pattern, min, max, and length limits to validate user input directly in the browser.
What are the best practices for cross-browser compatibility in HTML5?Mar 17, 2025 pm 12:20 PMArticle discusses best practices for ensuring HTML5 cross-browser compatibility, focusing on feature detection, progressive enhancement, and testing methods.
How to efficiently add stroke effects to PNG images on web pages?Mar 04, 2025 pm 02:39 PMThis article demonstrates efficient PNG border addition to webpages using CSS. It argues that CSS offers superior performance compared to JavaScript or libraries, detailing how to adjust border width, style, and color for subtle or prominent effect
What is the purpose of the <datalist> element?Mar 21, 2025 pm 12:33 PMThe article discusses the HTML <datalist> element, which enhances forms by providing autocomplete suggestions, improving user experience and reducing errors.Character count: 159
What is the purpose of the <progress> element?Mar 21, 2025 pm 12:34 PMThe article discusses the HTML <progress> element, its purpose, styling, and differences from the <meter> element. The main focus is on using <progress> for task completion and <meter> for stati
How do I use the HTML5 <time> element to represent dates and times semantically?Mar 12, 2025 pm 04:05 PMThis article explains the HTML5 <time> element for semantic date/time representation. It emphasizes the importance of the datetime attribute for machine readability (ISO 8601 format) alongside human-readable text, boosting accessibilit
What is the purpose of the <meter> element?Mar 21, 2025 pm 12:35 PMThe article discusses the HTML <meter> element, used for displaying scalar or fractional values within a range, and its common applications in web development. It differentiates <meter> from <progress> and ex
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function
Dreamweaver Mac version
Visual web development tools
ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment
SublimeText3 Mac version
God-level code editing software (SublimeText3)
mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),
