最近在web?前臺（front-end）開發(fā)時遇到一個技術問題，但沒查到解決方法，想請教一下：在web?客戶端（client?side）如何實現(xiàn)在一個“父?(parent)"?drop?down?list內部?再嵌套另一個”子（child）“drop?down?list?并將子下拉菜單取值后的內容傳給上一級下拉菜單后輸出
回復討論(解決方案)
1.外層的drop?down?list?通過其他元素如div去模擬
2.重新設計使之更合理?這種情況可以像常見的選擇了省份在選擇市之類的關聯(lián)選擇那樣選擇
多謝樓上的朋友。由于我經驗很有限，不知能否提供一些實例，或給個鏈接參考一下。
謝先！
現(xiàn)在遇到的情況是這樣的：
（1）在firefox上運行異常；
（2）子（child)dropdownlist中取的值，不知如何賦給上一dropdownlist（即由css，div模擬的那個parent?dropdownlist）
練習源代碼如下：
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 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> </h1> <h2> </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;}