Das Beispiel in diesem Artikel beschreibt die Methode zur Verwendung von JavaScript zum dynamischen Erstellen eines vertikalen Listenmenüs von Provinzen und Städten in DOM. Teilen Sie es als Referenz mit allen. Die spezifische Implementierungsmethode lautet wie folgt:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>动态创建纵向列表</title> <style type="text/css"> a { color: #000; text-decoration: none; } a:hover { color: #F00; } #menu { width: 100px; border: 1px solid #CCC; border-bottom:none;} #menu ul { list-style: none; margin: 0px; padding: 0px; } #menu ul li { background: #eee; padding: 0px 8px; height: 26px; line-height: 26px; border-bottom: 1px solid #CCC; position:relative; } #menu ul li ul { display:none; position: absolute; left: 100px; top: 0px; width:100px;border:1px solid #ccc; border-bottom:none; } #menu ul li.current ul { display:block;} #menu ul li ul li{text-align:center;} /*设置城市内容居中*/ </style> <script type="text/javascript"> var provs = { "江西省": ["南昌市", "景德镇", "九江", "鹰潭", "萍乡", "新馀", "赣州", "吉安", "宜春", "抚州", "上饶"], "福建省": ["福州", "厦门", "莆田", "三明", "泉州", "漳州", "南平", "龙岩", "宁德"], "河北省": ["石家庄", "邯郸", "邢台", "保定", "张家口", "承德", "廊坊", "唐山", "秦皇岛", "沧州", "衡水"], "四川省": ["成都市", "自贡市", "攀枝花市", "泸州市", "德阳市", "绵阳市", "广元市", "遂宁市", "内江市", "乐山市", "南充市", "眉山市", "宜宾市", "广安市", "达州市", "雅安市", "巴中市", "资阳市", "阿坝藏族羌族自治州", "甘孜藏族自治州", "凉山彝族自治州"], "山西省": ["太原市", "大同市", "阳泉市", "长治市", "晋城市", "朔州市", "晋中市", "运城市", "忻州市", "临汾市", "吕梁市"], "内蒙古": ["呼和浩特市", "包头市", "乌海市", "赤峰市", "通辽市", "鄂尔多斯市", "呼伦贝尔市", "巴彦淖尔市", "乌兰察布市", "兴安盟", "锡林郭勒盟", "阿拉善盟"], "海南省": ["海口市", "三亚市"], "重庆市": ["重庆"], "贵州省": ["贵阳市", "六盘水市", "遵义市", "安顺市", "铜仁地区", "黔西南布依族苗族自治州", "毕节地区", "黔东南苗族侗族自治州", "黔南布依族苗族自治州"], "甘肃省": ["兰州市", "嘉峪关市", "金昌市", "白银市", "天水市", "武威市", "张掖市", "平凉市", "酒泉市", "庆阳市", "定西市", "陇南市", "临夏回族自治州", "甘南藏族自治州"], "青海省": ["西宁市", "海东地区", "海北藏族自治州", "黄南藏族自治州", "海南藏族自治州", "果洛藏族自治州", "玉树藏族自治州", "海西蒙古族藏族自治州"], "宁夏自治区": ["银川市", "石嘴山市", "吴忠市", "固原市", "中卫市"] }; function iniEvent() { var provUL = document.getElementById("prov"); if (provUL) { var allli = provUL.getElementsByTagName("li"); for (i = 0; i < allli.length; i++) { node = allli[i]; node.onmouseover = function () { //鼠标经过时显示层 this.className = "current"; } node.onmouseout = function () { //鼠标离开时隐藏层 this.className = this.className.replace("current", ""); } } } } function loadData() { var provUL = document.getElementById("prov"); var nIndex = 0; for (var key in provs) { var provLi = document.createElement("li"); provLi.id = "provLI" + nIndex; provLi.innerHTML = "<a href='#'>" + key + "</a>"; provUL.appendChild(provLi); //添加省份li //================添加城市======================== var citys = provs[key]; if (citys.length > 0) { var cityUL = document.createElement("ul"); var maxLength = 0; //存放最大城市内容的长度,以便后面设置cityUL的最大宽度,达到宽度自适应 for (var i = 0; i < citys.length; i++) { var cityName = citys[i]; if (cityName.length > maxLength) { maxLength = cityName.length; //提取最大长度的城市 } var cityLI = document.createElement("li"); cityLI.id = "cityLI" + i; cityLI.innerHTML = "<a href='#'>" + cityName + "</a>"; cityUL.appendChild(cityLI); } if (maxLength <= 6) { maxLength = 100; } else { maxLength = maxLength * 20; //这里乘以20主要是按一个字20px来算 } maxLength = maxLength + "px"; //加上像素的px后缀 cityUL.style.width= maxLength; //设置cityUL的最大宽度 provLi.appendChild(cityUL); //添加城市UL } nIndex++; } iniEvent(); //初始化事件 } </script> </head> <body onload ="loadData()"> <div id="menu"> <ul id="prov"> </ul> </div> </body> </html>
Ich hoffe, dass dieser Artikel für das JavaScript-Programmierdesign aller hilfreich sein wird.