web下拉列表_关于web中下拉列表的几种实现方法

㈠ web自动化，下拉框处理

web中的下拉框selenium处理基本的定位option的方式，还提供了Select类来进行操作
方式一：
1.定位option选项，进行点击
方式二：
通过Select类实现
from selenium.webdriver.support.select import Select
select = Select(driver.find_element_by_id("selectA")) # 通过select标签生成Select对象
select.select_by_index(index) # 通过索引获取option
select_by_value(value) # 根据option属性 value值来定位
select_by_visible_text(text) # 通过option标签中的显示文本获取
以前在黑马程序员培训后，也会买他们出版的书，这个就是直接从书上看的。现在很多大学都用的他们的教材，我就会没事看看。反正说的挺详细的。

㈡ java web怎么实现下拉菜单

这个很好实现，在后台进行查询，查询到所有的菜单id和name以及其他的数据，后返回主页面，再有jstl表达式遍历出来，或者c标签的foreach标签直接遍历就ok了

㈢ CSS网页下拉列表大小怎么调整

需要准备的材料分别有：电脑、浏览器、html编辑器。

1、首先，打开html编辑器，新建html文件，例如：index.html。

㈣网页设计关于下拉列表的代码

看看这个不错：
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>Untitled Document</title>
<script language="JavaScript" type="text/javascript">
//---------------------------------------------------------------------------
// 功能搜索选择框
// 作者:Joshua
// 创建时间:2007-02-07
// Email:JoshuaChen[at]126.com
// webSite:www.x.cn
//---------------------------------------------------------------------------
//省
var Data_Area_Province = new Array("安徽","北京","福建","甘肃","广东","广西","贵州","海南","河北","河南","黑龙江","湖北","湖南","吉林","江苏","江西","辽宁","内蒙古","宁夏","青海","山东","山西","陕西","上海","四川","天津","西藏","新疆","云南","浙江","重庆");
//市区
var Data_Area_City = new Array();
Data_Area_City[0] = new Array("安庆","蚌端口","马鞍山","宿州","铜陵","芜湖","宣城","亳州");
Data_Area_City[1] = new Array("北京");
Data_Area_City[2] = new Array("福州","龙岩","南平","宁德","莆田","泉州","三明","厦门","漳州");
Data_Area_City[3] = new Array("白银","定西","天水","武威","张掖");
Data_Area_City[4] = new Array("潮州","东莞","佛山","广州","肇庆","中山","珠海");
Data_Area_City[5] = new Array("百色","北海","崇左","防城港","桂林","贵港","河池","贺州","来宾","柳州","南宁","钦州","梧州","玉林");
Data_Area_City[6] = new Array("安顺","毕节","贵阳","六盘水","铜仁","遵义");
Data_Area_City[7] = new Array("白沙黎族自治县","乐东黎族自治县","万宁","文昌","五指山","儋州");
Data_Area_City[8] = new Array("保定","沧州","承德","邯郸","衡水","廊坊","秦皇岛","石家庄","唐山","邢台","张家口");
Data_Area_City[9] = new Array("安阳","鹤壁","济源","焦作","开封","洛阳","周口","驻马店","漯河","濮阳");
Data_Area_City[10]= new Array("大庆","大兴安岭","哈尔滨","鹤岗","七台河","齐齐哈尔","双鸭山","绥化","伊春");
Data_Area_City[11] = new Array("鄂州","恩施土家族苗族自治州","黄冈","襄樊","孝感","宜昌");
Data_Area_City[12] = new Array("常德","长沙","岳阳","张家界","株洲");
Data_Area_City[13] = new Array("白城","白山","长春","吉林","辽源","四平","松原","通化","延边朝鲜族自治州");
Data_Area_City[14] = new Array("常州","淮安","连云港","南京","南通","苏州","宿迁","泰州","无锡","徐州","盐城","扬州","镇江");
Data_Area_City[15] = new Array("抚州","赣州","吉安","景德镇","九江","南昌","萍乡","上饶","新余","宜春","鹰潭");
Data_Area_City[16] = new Array("鞍山","本溪","朝阳","沈阳","铁岭","营口");
Data_Area_City[17] = new Array("阿拉善盟","巴彦淖尔盟","包头","锡林郭勒盟","兴安盟");
Data_Area_City[18] = new Array("固原","石嘴山","吴忠","银川");
Data_Area_City[19] = new Array("果洛藏族自治州","西宁","玉树藏族自治州");
Data_Area_City[20] = new Array("滨州","德州","东营","菏泽","潍坊","烟台","枣庄","淄博");
Data_Area_City[21] = new Array("长治","大同","晋城","晋中","临汾","吕梁","朔州","太原","忻州","阳泉","运城");
Data_Area_City[22] = new Array("安康","宝鸡","汉中","商洛","铜川","渭南","西安","咸阳","延安","榆林");
Data_Area_City[23] = new Array("上海");
Data_Area_City[24] = new Array("阿坝藏族羌族自治州","绵阳","南充","内江","攀枝花","遂宁","雅安","宜宾","资阳","自贡","泸州");
Data_Area_City[25] = new Array("天津");
Data_Area_City[26] = new Array("阿里","昌都","拉萨","林芝","那曲","日喀则","山南");
Data_Area_City[27] = new Array("阿克苏","和田","喀什","吐鲁番","乌鲁木齐","五家渠","伊犁哈萨克自治州");
Data_Area_City[28] = new Array("保山","玉溪","昭通");
Data_Area_City[29] = new Array("杭州","湖州","嘉兴","金华","丽水","宁波","绍兴","台州","温州","舟山","衢州");
Data_Area_City[30] = new Array("重庆");
//学历
var Data_School = new Array("初中","高中","中专","大专","本科","双学位");
//行业
var Data_Instry = new Array("计算机类","金融/证券/保险类","财务类","工业/工厂类 ","技工类","机械/设备维修类","动力电气类", "轻工类 ","美容保健类");
//时间
var Data_Date = new Array("今天","三天内","一个星期内","半个月内","一个月内","三个月内","半年内","一年内","所有");
//层状态
var Date_DivState=new Array()
//鼠标焦点状态
var focusState=false
var Search = new Object();
//--------------------------------------
// 初始化Div标签事件
// Joshua 2007-02-07
//--------------------------------------
Search.Init = function(){
document.getElementById("Data_Area").onclick = Search.ShowArea.Init;
document.getElementById("Data_School").onclick = Search.ShowSchool;
document.getElementById("Data_Instry").onclick = Search.ShowInstry;
document.getElementById("Data_Date").onclick = Search.ShowDate;
}
//-------------------------------
// 创建一个Div对象
// Joshua 2007-02-07
//-------------------------------
Search.CreateDiv = function(obj,Id,X,Y,oWidth,oHeight){
var Obj_Div = document.createElement("div");
Obj_Div.setAttribute("id",Id);
Obj_Div.style.position="absolute";
Obj_Div.style.background="#fff";
Obj_Div.style.zIndex = "10000";
Obj_Div.style.border="1px solid #CCCCCC";
Obj_Div.style.padding="3px";
Obj_Div.style.lineHeight ="120%";
Obj_Div.style.left=X+"px";
Obj_Div.style.top=Y+"px";
Obj_Div.style.whiteSpace="nowrap";
Obj_Div.style.width= oWidth + "px";
Obj_Div.style.height= oHeight + "px";
obj.appendChild(Obj_Div);
}
//------------------------------------
// 判断Div是否存在
// Joshua 2007-02-07
//------------------------------------
Search.IsDiv = function(Id){
var result = true
try{
document.getElementById(Id).a=1;
}catch(e){
result = false
}
return(result);
}
//----------------------------
// 删除Div对象
// Joshua 2007-02-07
//----------------------------
Search.RemoveDiv = function(Id){
try{
document.getElementById(Id).removeNode(true);
}catch(e){}
}
//---------------------------
// 遍历清除无用Div对象
// Joshua 2007-02-07
//---------------------------
Search.DelDiv = function(){
try{
document.getElementById("Div_Area").removeNode(true);
document.getElementById("Data_Area").innerHTML = "<font face=\"webdings\" style=\"font-size:10px; color:#ff9900;\">4</font>" + document.getElementById("Data_Area").innerText.substring(1,document.getElementById("Data_Area").innerText.length);
}catch(e){}
try{
document.getElementById("Div_School").removeNode(true);
document.getElementById("Data_School").innerHTML = "<font face=\"webdings\" style=\"font-size:10px; color:#ff9900;\">4</font>" + document.getElementById("Data_School").innerText.substring(1,document.getElementById("Data_School").innerText.length);
}catch(e){}
try{
document.getElementById("Div_Instry").removeNode(true);
document.getElementById("Data_Instry").innerHTML = "<font face=\"webdings\" style=\"font-size:10px; color:#ff9900;\">4</font>" + document.getElementById("Data_Instry").innerText.substring(1,document.getElementById("Data_Instry").innerText.length);
}catch(e){}
try{
document.getElementById("Div_Date").removeNode(true);
document.getElementById("Data_Date").innerHTML = "<font face=\"webdings\" style=\"font-size:10px; color:#ff9900;\">4</font>" + document.getElementById("Data_Date").innerText.substring(1,document.getElementById("Data_Date").innerText.length);
}catch(e){}
}
//--------------------------
// 失去焦点,清楚Div对象
// Joshua 2007-02-07
//--------------------------
Search.Lostfocus = function(){
if(!focusState){
try{
document.getElementById("Div_Area").removeNode(true);
document.getElementById("Data_Area").innerHTML = "<font face=\"webdings\" style=\"font-size:10px; color:#ff9900;\">4</font>" + document.getElementById("Data_Area").innerText.substring(1,document.getElementById("Data_Area").innerText.length);
}catch(e){}
try{
document.getElementById("Div_School").removeNode(true);
document.getElementById("Data_School").innerHTML = "<font face=\"webdings\" style=\"font-size:10px; color:#ff9900;\">4</font>" + document.getElementById("Data_School").innerText.substring(1,document.getElementById("Data_School").innerText.length);
}catch(e){}
try{
document.getElementById("Div_Instry").removeNode(true);
document.getElementById("Data_Instry").innerHTML = "<font face=\"webdings\" style=\"font-size:10px; color:#ff9900;\">4</font>" + document.getElementById("Data_Instry").innerText.substring(1,document.getElementById("Data_Instry").innerText.length);
}catch(e){}
try{
document.getElementById("Div_Date").removeNode(true);
document.getElementById("Data_Date").innerHTML = "<font face=\"webdings\" style=\"font-size:10px; color:#ff9900;\">4</font>" + document.getElementById("Data_Date").innerText.substring(1,document.getElementById("Data_Date").innerText.length);
}catch(e){}
}
}
Search.ShowArea = function(){} //空对象
//------------------------
// 显示地区一级菜单
// Joshua 2007-02-07
//------------------------
Search.ShowArea.Init = function(){
focusState = true;
Search.DelDiv()//删除其他DIV标签
if(!Search.IsDiv("Div_Area")){//判断对象是否建立,防止再次激发事件,引起的对象多次重复建立
//更改Data_Area对象内容
document.getElementById("Data_Area").innerHTML = "<font face=\"webdings\" style=\"font-size:10px; color:#ff9900;\">6</font>" + document.getElementById("Data_Area").innerText.substring(1,document.getElementById("Data_Area").innerText.length);
//显示层
Search.CreateDiv(document.body,"Div_Area",Search.getSelectPosition(document.getElementById("Data_Area"))[0],Search.getSelectPosition(document.getElementById("Data_Area"))[1]+12,80,0);
//创建省级分类
for(var i=0;i<Data_Area_Province.length;i++){
var Obj_Span = document.createElement("div");
Obj_Span.setAttribute("id","Div_Area_Province_"+i);
Obj_Span.setAttribute("value",i);
Obj_Span.style.cursor="pointer";
Obj_Span.onmouseover = function(){
focusState = true;
this.style.border="1px solid #827C5F";
this.style.background="#CEC497";
}
Obj_Span.onmouseout = function(){
focusState = false;
if (!Date_DivState[this.getAttribute("value")]){
this.style.border="0px solid #ffffff";
this.style.background="#fff";}
}
Obj_Span.onclick = function(){
focusState = true;
//恢复非本对象的其他一级菜单项目样式
for(var i=0;i<Date_DivState.length;i++){
if(Date_DivState[i]==true&&this.value!=document.getElementById("Div_Area_Province_"+i).value){
document.getElementById("Div_Area_Province_"+i).style.border="0px solid #ffffff";
document.getElementById("Div_Area_Province_"+i).style.background="#fff";
}
}
//设置层状态
Date_DivState[this.getAttribute("value")] = true;
//生成二级菜单
Search.ShowArea.InitCity(this.getAttribute("value"),this)
}
Obj_Span.innerHTML = Data_Area_Province[i] + "<font face=\"webdings\" style=\"font-size:10px; color:#000;position:absolute;right:3px; \">4</font>";
document.getElementById("Div_Area").appendChild(Obj_Span);
}
}
}
//----------------------
// 显示地区二级菜单
// Joshua 2007-02-07
//----------------------
Search.ShowArea.InitCity = function(oId,obj){
if(!Search.IsDiv("Div_Area_City_"+oId)){//判断对象是否建立,防止再次激发事件,引起的对象多次重复建立
//删除除对象外存在的二级菜单对象
for(var i=0;i<Date_DivState.length;i++){
if(Date_DivState[i]==true&&i!=oId){
Search.RemoveDiv("Div_Area_City_"+i);
Date_DivState[i]=null;
}
}
//生成指定的二级菜单对象
Search.CreateDiv(obj,"Div_Area_City_"+oId,obj.offsetWidth,obj.offsetTop,50,0);

if(oId<Data_Area_Province.length){
for(var i=0;i<Data_Area_City[oId].length;i++){
var Obj_Span = document.createElement("div");
Obj_Span.setAttribute("id","Div_Area_City"+i);
Obj_Span.style.cursor="pointer";
Obj_Span.innerText = Data_Area_City[oId][i];
Obj_Span.setAttribute("value",oId);
Obj_Span.onmouseover = function(){
focusState = true;
this.style.border="1px solid #827C5F";
this.style.background="#CEC497";
}
Obj_Span.onmouseout = function(){
focusState = false;
this.style.border="0px solid #ffffff";
this.style.background="#fff";
}
Obj_Span.onclick = function(){
//设置Data_Area的对象为选择的职
document.getElementById("Data_Area").innerHTML = "<font face=\"webdings\" style=\"font-size:10px; color:#ff9900;\">4</font>" + this.innerText;
//删除Div对象
Search.RemoveDiv("Div_Area");
//恢复状态数组
Date_DivState.length=0;
}
document.getElementById("Div_Area_City_"+oId).appendChild(Obj_Span);
}
}
}

}
//-------------------
// 学历Div操作
// Joshua 2007-02-07
//-------------------
Search.ShowSchool=function(){
focusState = true;
Search.DelDiv();//删除其他DIV标签
if(!Search.IsDiv("Div_School")){//判断对象是否建立,防止再次激发事件,引起的对象多次重复建立
document.getElementById("Data_School").innerHTML = "<font face=\"webdings\" style=\"font-size:10px; color:#ff9900;\">6</font>" + document.getElementById("Data_School").innerText.substring(1,document.getElementById("Data_School").innerText.length);
Search.CreateDiv(document.body,"Div_School",Search.getSelectPosition(document.getElementById("Data_School"))[0],Search.getSelectPosition(document.getElementById("Data_School"))[1]+12,60,0);
for(var i=0;i<Data_School.length;i++){
var Obj_Span = document.createElement("div");
Obj_Span.setAttribute("id","Div_School_"+i);
Obj_Span.setAttribute("value",i);
Obj_Span.style.cursor="pointer";
Obj_Span.onmouseover = function(){
focusState = true;
this.style.border="1px solid #827C5F";
this.style.background="#CEC497";
}
Obj_Span.onmouseout = function(){
focusState = false;
this.style.border="0px solid #ffffff";
this.style.background="#fff";
}
Obj_Span.onclick = function(){
document.getElementById("Data_School").innerHTML = "<font face=\"webdings\" style=\"font-size:10px; color:#ff9900;\">4</font>" + this.innerText;
Search.RemoveDiv("Div_School");
}
Obj_Span.innerHTML = Data_School[i];
document.getElementById("Div_School").appendChild(Obj_Span);
}
}
}
//----------------------
// 行业Div操作
// Joshua 2007-02-07
//----------------------
Search.ShowInstry = function(){
focusState = true;
Search.DelDiv();//删除其他DIV标签
if(!Search.IsDiv("Div_Instry")){//判断对象是否建立,防止再次激发事件,引起的对象多次重复建立
document.getElementById("Data_Instry").innerHTML = "<font face=\"webdings\" style=\"font-size:10px; color:#ff9900;\">6</font>" + document.getElementById("Data_Instry").innerText.substring(1,document.getElementById("Data_Instry").innerText.length);
Search.CreateDiv(document.body,"Div_Instry",Search.getSelectPosition(document.getElementById("Data_Instry"))[0],Search.getSelectPosition(document.getElementById("Data_Instry"))[1]+12,160,0);
for(var i=0;i<Data_Instry.length;i++){
var Obj_Span = document.createElement("div");
Obj_Span.setAttribute("id","Div_Instry_"+i);
Obj_Span.setAttribute("value",i);
Obj_Span.style.cursor="pointer";
Obj_Span.onmouseover = function(){
focusState = true;
this.style.border="1px solid #827C5F";
this.style.background="#CEC497";
}
Obj_Span.onmouseout = function(){
focusState = false;
this.style.border="0px solid #ffffff";
this.style.background="#fff";
}
Obj_Span.onclick = function(){
document.getElementById("Data_Instry").innerHTML = "<font face=\"webdings\" style=\"font-size:10px; color:#ff9900;\">4</font>" + this.innerText;
Search.RemoveDiv("Div_Instry");
}
Obj_Span.innerHTML = Data_Instry[i];
document.getElementById("Div_Instry").appendChild(Obj_Span);
}
}
}
//-----------------------------
// 时间Div操作
// Joshua 2007-02-07
//-----------------------------
Search.ShowDate = function(){
focusState = true;
Search.DelDiv();//删除其他DIV标签
if(!Search.IsDiv("Div_Date")){//判断对象是否建立,防止再次激发事件,引起的对象多次重复建立
document.getElementById("Data_Date").innerHTML = "<font face=\"webdings\" style=\"font-size:10px; color:#ff9900;\">6</font>" + document.getElementById("Data_Date").innerText.substring(1,document.getElementById("Data_Date").innerText.length);
Search.CreateDiv(document.body,"Div_Date",Search.getSelectPosition(document.getElementById("Data_Date"))[0],Search.getSelectPosition(document.getElementById("Data_Date"))[1]+12,60,0);
for(var i=0;i<Data_Date.length;i++){
var Obj_Span = document.createElement("div");
Obj_Span.setAttribute("id","Div_Date_"+i);
Obj_Span.setAttribute("value",i);
Obj_Span.style.cursor="pointer";
Obj_Span.onmouseover = function(){
focusState = true;
this.style.border="1px solid #827C5F";
this.style.background="#CEC497";
}
Obj_Span.onmouseout = function(){
focusState = false;
this.style.border="0px solid #ffffff";
this.style.background="#fff";
}
Obj_Span.onclick = function(){
document.getElementById("Data_Date").innerHTML = "<font face=\"webdings\" style=\"font-size:10px; color:#ff9900;\">4</font>" + this.innerText;
Search.RemoveDiv("Div_Date");
}
Obj_Span.innerHTML = Data_Date[i];
document.getElementById("Div_Date").appendChild(Obj_Span);
}
}
}
//-----------------------
// 获取一个对象的坐标
//------------------------
Search.getSelectPosition = function(Gobj) {
var objLeft = Gobj.offsetLeft;
var objTop = Gobj.offsetTop;
var objParent = Gobj.offsetParent;
while (objParent!= null) {
objLeft += objParent.offsetLeft;
objTop += objParent.offsetTop;
objParent = objParent.offsetParent;
}
return([objLeft,objTop]);
}
//------------------------
// 页面初始化
//------------------------
window.onload=function(){
Search.Init();
}
window.document.onclick=function (){
Search.Lostfocus();
}
</script>
<style>
BODY{FONT-SIZE: 12px;}
</style>
</head>
<body>
<span id="Data_Area" style="cursor:pointer;"><font face="webdings" style="font-size:10px; color:#ff9900;">4</font>地区</span>
<span id="Data_School" style="cursor:pointer;"><font face="webdings\" style="font-size:10px; color:#ff9900;">4</font>学历</span>
<span id="Data_Instry" style="cursor:pointer;"><font face="webdings" style="font-size:10px; color:#ff9900;">4</font>行业</span>
<span id="Data_Date" style="cursor:pointer;"><font face="webdings" style="font-size:10px; color:#ff9900;">4</font>时间</span>
</body>
</html>

㈤麻烦详细解释一下下面 web下拉菜单的代码什么意思

asp制作很HTM制作是一样的。
只是看你有没有用到动态输出链接及标题了。

㈥下拉菜单的在web页面的应用

以条形菜单栏和菜单栏中每个菜单项的弹出菜单窗口两部分组成，一般作为应用系统的主菜单使用。

㈦ web页面下拉菜单

js的,我有很多,怎么给你哦?

㈧关于web中下拉列表的几种实现方法

<div>
<select name="selectAge" id="selectAge">
<option value="1">18-21</option>
<option value="2">22-25</option>
<option value="3">26-29</option>
<option value="4">30-35</option>
<option value="5">Over35</option>
</select>
</div>


<div>
<select name="selectAge" id="selectAge" multiple="multiple">
<option value="1">18-21</option>
<option value="2">22-25</option>
<option value="3">26-29</option>
<option value="4">30-35</option>
<option value="5">Over35</option>
</select>
</div>
上面的两种是用HTML标签实现的

还有一些实现方法是通过struts方法中的标签实现的（不是很常用）

㈨ java web如何初始化下拉列表

一般不要初始化，即使加载了，如果没有被使用，浪费流量。给 select 添加 onselect 事件，使用Ajax 调用数据库，一般请求过一次后会缓存到本机，很方便的。试试吧

㈩在java web中下拉列表框标记中〈option〉是什么意思

这个是用来设置枚举值，也就是下拉框里面的参数，option里面有value属性，表示你选中后获取的数据

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