ASP+JS三级联动下拉菜单[调用数据库数据]


            网上三级菜单多是多但是代码都比较烦，我这个应该说还是比较直观的：'肯定先要连接数据库了，不用说了 '数据库结构 '类别1表名称：a  字段：ID,Name  说明：ID为主键是类别1的ID值，Name为类别1的名称 '类别2表名称：aa  字段：ID,aID,Name  说明：ID为主键是类别2的ID值，aID为所属类别1的ID值，Name为类别2的名称 '类别3表名称：aaa  字段：ID,aID,aaID,Name  说明：ID为主键是类别3的ID值，aID为所属类别1的ID值，aaID为所属类别2的ID值，Name为类别3的名称 =====test1.asp 你可以测试下，接收到的都是类别的ID值==== <% response.write"1:"&Request.form("s1")&"<BR>" response.write"2:"&Request.form("s2")&"<BR>" response.write"3:"&Request.form("s3")&"<BR>" %> 复制代码 代码如下:<!-- 三级联动菜单 开始 --> <script language="JavaScript"> <!-- <% '二级数据保存到数组 Dim count2,rsClass2,sqlClass2 set rsClass2=server.createobject("adodb.recordset") sqlClass2="select * from aa"  rsClass2.open sqlClass2,conn,1,1 %> var subval2 = new Array(); //数组结构：一级根值,二级根值,二级显示值 <% count2 = 0 do while not rsClass2.eof %> subval2[<%=count2%>] = new Array('<%=rsClass2("aID")%>','<%=rsClass2("ID")%>','<%=rsClass2("Name")%>') <% count2 = count2 + 1 rsClass2.movenext loop rsClass2.close %> <% '三级数据保存到数组 Dim count3,rsClass3,sqlClass3 set rsClass3=server.createobject("adodb.recordset") sqlClass3="select * from aaa"  rsClass3.open sqlClass3,conn,1,1 %> var subval3 = new Array(); //数组结构：二级根值,三级根值,三级显示值 <% count3 = 0 do while not rsClass3.eof %> subval3[<%=count3%>] = new Array('<%=rsClass3("aaID")%>','<%=rsClass3("ID")%>','<%=rsClass3("Name")%>') <% count3 = count3 + 1 rsClass3.movenext loop rsClass3.close %> function changeselect1(locationid) {     document.form1.s2.length = 0;     document.form1.s2.options[0] = new Option('==请选择类别==','');     document.form1.s3.length = 0;     document.form1.s3.options[0] = new Option('==请选择专题==','');     for (i=0; i<subval2.length; i++)     {         if (subval2[i][0] == locationid)         {document.form1.s2.options[document.form1.s2.length] = new Option(subval2[i][2],subval2[i][1]);}     } } function changeselect2(locationid) {     document.form1.s3.length = 0;     document.form1.s3.options[0] = new Option('==请选择专题==','');     for (i=0; i<subval3.length; i++)     {         if (subval3[i][0] == locationid)         {document.form1.s3.options[document.form1.s3.length] = new Option(subval3[i][2],subval3[i][1]);}     } } //--> </script> <form name="form1" method="post" action="test1.asp"> 三级联动： <% Dim count1,rsClass1,sqlClass1 set rsClass1=server.createobject("adodb.recordset") sqlClass1="select * from a"  rsClass1.open sqlClass1,conn,1,1 %> <select name="s1" onChange="changeselect1(this.value)"> <option>==请选择频道==</option> <% count1 = 0 do while not rsClass1.eof response.write"<option value="&rsClass1("ID")&">"&rsClass1("Name")&"</option>" count1 = count1 + 1 rsClass1.movenext loop rsClass1.close %> </select> <select name="s2"  onChange="changeselect2(this.value)">  <option>==请选择类别==</option> </select> <select name="s3">  <option>==请选择专题==</option> </select> <input type="submit" name="Submit" value="提交"></form> <!-- 三级联动菜单 结束 -->