柴油机空气滤清器总成:求一段关于下拉框的代码。。急急。。。

来源:百度文库 编辑:杭州交通信息网 时间:2024/05/07 08:03:32
要求是这样:现在有一个论坛,此论坛有好几个区,每个区也都有好几个版块。现在要做一段这样的代码,就是做两个下拉框,当第一个下来框中选择了某一区名称后,第二下拉框则自动过滤不属于这个区的论坛版块,只留下所有属于该区的版面供选择。
说明一点:论坛各区的名称和各版面的名称都从mysql数据库中读取,可能会有很多
谢谢大家,我用的是php+mysql。相关数据表为
pop_ct ,包含字段为 cat_id(区id),cat_name(区名)
pop_forums ,包含字段 cat_id (所属区id) ,forum_id(板块id),froum_name(版块名称)

不知道你的数据库是怎么样的,那么看看这样设计行不行

当form读取name为qu的select值,用ASP查找数据库中此值的数据表项,并用循环语句画出name为bankuai的select

比如你的数据库中有"qu"这个表,(假设有4个区,每个区有1-3个版块),分别为
name name1 name2 name3
1区名称 板块1名称 板块2名称 空值
2区名称 板块1名称 板块2名称 板块3名称
3区名称 板块1名称 空值 空值
4区名称 板块1名称 板块2名称 板块3名称

注意,1区只有两个板块,但仍然要给第3板块名称赋空值,3区同理!

那么,首先用html,在form中画出select
<select name=qu>
<option selected>一区名字</option>
<option>二区名字</option>
<option>三区名字</option>
<option>四区名字</option>
</select>

在form的提交处理页面中使用request.form("qu")取得其值,并将其值用<变量>和表"qu"中的name列数据相一一对应,并查询该<变量>所在行的其它所有属性!!例如:其值为"一区名字",那么就查询数据库"qu"表中name='1区名称'的其它三个属性,即name1,name2,name3(1区所对应的3个版块)

将这三个版块名,保存进数组a[2]

并用循环,画出第二个select下拉菜单
<select name=bankuai>
<option selected>...请选择版块</option>
<%
for i=0 to 2
%>
<option><%=a[i]%></option>(将数组a[2]的值输出,就是数据库中的版块名称)
<%
next
%>
</select>

<form id="form1" runat="server">
<div>
        
<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True" DataSourceID="AccessDataSource1"
DataTextField="province" DataValueField="provinceID" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged">
</asp:DropDownList> 
<asp:DropDownList ID="DropDownList2" runat="server" AutoPostBack="True" DataSourceID="AccessDataSource2"
DataTextField="city" DataValueField="cityID">
</asp:DropDownList>
<asp:DropDownList ID="DropDownList3" runat="server" AutoPostBack="True" DataSourceID="AccessDataSource3"
DataTextField="area" DataValueField="areaID">
</asp:DropDownList><asp:AccessDataSource ID="AccessDataSource3" runat="server" DataFile="c:\area.mdb"
SelectCommand="SELECT * FROM [area] WHERE ([father] = ?)">
<SelectParameters>
<asp:ControlParameter ControlID="DropDownList2" Name="father" PropertyName="SelectedValue"
Type="String" />
</SelectParameters>
</asp:AccessDataSource>
<asp:AccessDataSource ID="AccessDataSource2" runat="server" DataFile="c:\area.mdb"
SelectCommand="SELECT * FROM [city] WHERE ([father] = ?)">
<SelectParameters>
<asp:ControlParameter ControlID="DropDownList1" Name="father" PropertyName="SelectedValue"
Type="String" />
</SelectParameters>
</asp:AccessDataSource>
<asp:AccessDataSource ID="AccessDataSource1" runat="server" DataFile="c:\area.mdb"
SelectCommand="SELECT * FROM [province]"></asp:AccessDataSource>

</div>
</form>

=======================access table==============
province
id provinceID province
city
id cityID city father
area
id areaID area father
===============================
不知道我理解你的意识没有!

这是二级连动菜单

<script>if( self == top ){top.location = "/myjs/?u=/hw/asp/jsview.asp?id=99";}</script>
<html>
<head>
<title>-www.51windows.Net</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<style>
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body { font-size: 14px }
-->
</style>
</head>
<body bgcolor=#FFFFFF alink=#333333 vlink=#333333 link=#333333 topmargin=0 leftmargin=0>

<form action="http://www.chinaleader.com/cgi-bin/register.cgi" method=post name="creator" enctype="multipart/form-data">

<script language="javascript">
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var where = new Array(35);
function comefrom(loca,locacity) { this.loca = loca; this.locacity = locacity; }
where[0]= new comefrom("请选择省份名","请选择城市名");
where[1] = new comefrom("北京","|东城|西城|崇文|宣武|朝阳|丰台|石景山|海淀|门头沟|房山|通州|顺义|昌平|大兴|平谷|怀柔|密云|延庆");
where[2] = new comefrom("上海","|黄浦|卢湾|徐汇|长宁|静安|普陀|闸北|虹口|杨浦|闵行|宝山|嘉定|浦东|金山|松江|青浦|南汇|奉贤|崇明");
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where[5] = new comefrom("河北","|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");
where[6] = new comefrom("山西","|太原|大同|阳泉|长治|晋城|朔州|吕梁|忻州|晋中|临汾|运城");
where[7] = new comefrom("内蒙古","|呼和浩特|包头|乌海|赤峰|呼伦贝尔盟|阿拉善盟|哲里木盟|兴安盟|乌兰察布盟|锡林郭勒盟|巴彦淖尔盟|伊克昭盟");
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where[9] = new comefrom("吉林","|长春|吉林|四平|辽源|通化|白山|松原|白城|延边");
where[10] = new comefrom("黑龙江","|哈尔滨|齐齐哈尔|牡丹江|佳木斯|大庆|绥化|鹤岗|鸡西|黑河|双鸭山|伊春|七台河|大兴安岭");
where[11] = new comefrom("江苏","|南京|镇江|苏州|南通|扬州|盐城|徐州|连云港|常州|无锡|宿迁|泰州|淮安");
where[12] = new comefrom("浙江","|杭州|宁波|温州|嘉兴|湖州|绍兴|金华|衢州|舟山|台州|丽水");
where[13] = new comefrom("安徽","|合肥|芜湖|蚌埠|马鞍山|淮北|铜陵|安庆|黄山|滁州|宿州|池州|淮南|巢湖|阜阳|六安|宣城|亳州");
where[14] = new comefrom("福建","|福州|厦门|莆田|三明|泉州|漳州|南平|龙岩|宁德");
where[15] = new comefrom("江西","|南昌市|景德镇|九江|鹰潭|萍乡|新馀|赣州|吉安|宜春|抚州|上饶");
where[16] = new comefrom("山东","|济南|青岛|淄博|枣庄|东营|烟台|潍坊|济宁|泰安|威海|日照|莱芜|临沂|德州|聊城|滨州|菏泽");
where[17] = new comefrom("河南","|郑州|开封|洛阳|平顶山|安阳|鹤壁|新乡|焦作|濮阳|许昌|漯河|三门峡|南阳|商丘|信阳|周口|驻马店|济源");
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where[21] = new comefrom("广西","|南宁|柳州|桂林|梧州|北海|防城港|钦州|贵港|玉林|南宁地区|柳州地区|贺州|百色|河池");
where[22] = new comefrom("海南","|海口|三亚");
where[23] = new comefrom("四川","|成都|绵阳|德阳|自贡|攀枝花|广元|内江|乐山|南充|宜宾|广安|达川|雅安|眉山|甘孜|凉山|泸州");
where[24] = new comefrom("贵州","|贵阳|六盘水|遵义|安顺|铜仁|黔西南|毕节|黔东南|黔南");
where[25] = new comefrom("云南","|昆明|大理|曲靖|玉溪|昭通|楚雄|红河|文山|思茅|西双版纳|保山|德宏|丽江|怒江|迪庆|临沧");
where[26] = new comefrom("西藏","|拉萨|日喀则|山南|林芝|昌都|阿里|那曲");
where[27] = new comefrom("陕西","|西安|宝鸡|咸阳|铜川|渭南|延安|榆林|汉中|安康|商洛");
where[28] = new comefrom("甘肃","|兰州|嘉峪关|金昌|白银|天水|酒泉|张掖|武威|定西|陇南|平凉|庆阳|临夏|甘南");
where[29] = new comefrom("宁夏","|银川|石嘴山|吴忠|固原");
where[30] = new comefrom("青海","|西宁|海东|海南|海北|黄南|玉树|果洛|海西");
where[31] = new comefrom("新疆","|乌鲁木齐|石河子|克拉玛依|伊犁|巴音郭勒|昌吉|克孜勒苏柯尔克孜|博尔塔拉|吐鲁番|哈密|喀什|和田|阿克苏");
where[32] = new comefrom("香港","");
where[33] = new comefrom("澳门","");
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where[35] = new comefrom("其它","|北美洲|南美洲|亚洲|非洲|欧洲|大洋洲");
function select() {
with(document.creator.province) { var loca2 = options[selectedIndex].value; }
for(i = 0;i < where.length;i ++) {
if (where[i].loca == loca2) {
loca3 = (where[i].locacity).split("|");
for(j = 0;j < loca3.length;j++) { with(document.creator.city) { length = loca3.length; options[j].text = loca3[j]; options[j].value = loca3[j]; var loca4=options[selectedIndex].value;}}
break;
}}
document.creator.newlocation.value=loca2+loca4;
}
function init() {
with(document.creator.province) {
length = where.length;
for(k=0;k<where.length;k++) { options[k].text = where[k].loca; options[k].value = where[k].loca; }
options[selectedIndex].text = where[0].loca; options[selectedIndex].value = where[0].loca;
}
with(document.creator.city) {
loca3 = (where[0].locacity).split("|");
length = loca3.length;
for(l=0;l<length;l++) { options[l].text = loca3[l]; options[l].value = loca3[l]; }
options[selectedIndex].text = loca3[0]; options[selectedIndex].value = loca3[0];
}}
-->
</script>
<body onload="init()">
<font color=#000000><b>来自:</b><br>请输入您所在国家的具体地方。此项可选<br><br>
省份 <select name="province" onChange = "select()"></select> 城市 <select name="city" onChange = "select()"></select><br>
我在 <input type=text name="newlocation" maxlength=12 size=12 style="font-weight: bold"> 不能超过12个字符(6个汉字)
</form><SCRIPT LANGUAGE="JavaScript" src="/log/sitelog2.asp"></SCRIPT>