用JSP+JavaScript打造二级级联下拉菜单

2019-11-17 04:31:14

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jsp+javaScript打造二级级联下拉菜单：

class(一级栏目信息）：classId(自动编号），className（栏目名称）, Nclass（二级栏目信息）, NclassId（自动编号），NclassName(栏目名称），parentId（一级栏目id，与class表中的classId关联）

<%@ page contentType=text/html; charset=GB2312 language=java errorPage=../error.jsp %> <%@ include file=../conn.jsp%> <%@ include file=../ds.jsp%> <%@ taglib uri=http://java.sun.com/jsp/jstl/sql divfix=sql %> <%request.setCharacterEncoding(gb2312); %> <HTML><HEAD> <META http-equiv=Content-Type content=text/html; charset=gb2312> <TITLE>级联菜单</TITLE> <LINK rel=stylesheet type=text/CSS href=style.css> </HEAD> <!--从数据库中得到二级栏目信息--> <%String sql=select * from Nclass order by NclassId asc; ResultSet rs=stmt.executeQuery(sql); %> <!--将二级栏目信息保存到数组subcat中--> <script type=text/Javascript> var onecount; onecount=0; subcat = new Array();         <%         int count = 0;         while(rs.next()){         %> subcat[<%=count%>] = new Array(<%=rs.getString(NclassName)%>,<%=rs.getString(NclassId)%>,<%=rs.getString(parentId)%>);         <%         count++;         }         rs.close();         %> onecount=<%=count%>; <!--决定select显示的函数--> function changelocation(locationid)     {     document.myform.NclassId.length = 0;     var locationid=locationid;     var i;     for (i=0;i < onecount; i++)         {             if (subcat[i][2] == locationid)             {                 document.myform.NclassId.options[document.myform.NclassId.length] = new Option(subcat[i][0], subcat[i][1]);             }                }             }    </script> <FORM method=POST name=myform action=adminsave.jsp?action=add>   <TABLE>        <TR>       <TD>一级分类</TD>       <TD>          <SELECT name=classId onChange=changelocation(document.myform.classId.options[document.myform.classId.selectedIndex].value) size=1>           <OPTION selected value>==请选一级分类==</OPTION>         <sql:query var=query dataSource=$>           SELECT * FROM class        </sql:query> <c:forEach var=row items=$>  <option value=$>$</option> </c:forEach> </select>       </TD>       <TD>选择二级分类</TD>       <TD>         <SELECT name=NclassId>           <OPTION selected value>==请选二级分类==</OPTION>         </SELECT>       </TD>     </TR> </TABLE>   </FORM> </BODY> </HTML><%@ page contentType=text/html; charset=GB2312 language=java errorPage=../error.jsp %> <%@ include file=../conn.jsp%> <%@ include file=../ds.jsp%> <%@ taglib uri=http://java.sun.com/jsp/jstl/sql divfix=sql %> <%request.setCharacterEncoding(gb2312); %> <HTML><HEAD> <META http-equiv=Content-Type content=text/html; charset=gb2312> <TITLE>级联菜单</TITLE> <LINK rel=stylesheet type=text/css href=style.css> </HEAD> <!--从数据库中得到二级栏目信息--> <%String sql=select * from Nclass order by NclassId asc; ResultSet rs=stmt.executeQuery(sql); %> <!--将二级栏目信息保存到数组subcat中--> <script type=text/javascript> var onecount; onecount=0; subcat = new Array();         <%         int count = 0;         while(rs.next()){         %> subcat[<%=count%>] = new Array(<%=rs.getString(NclassName)%>,<%=rs.getString(NclassId)%>,<%=rs.getString(parentId)%>);         <%         count++;         }         rs.close();         %> onecount=<%=count%>; <!--决定select显示的函数--> function changelocation(locationid)     {     document.myform.NclassId.length = 0;     var locationid=locationid;     var i;     for (i=0;i < onecount; i++)         {             if (subcat[i][2] == locationid)             {                 document.myform.NclassId.options[document.myform.NclassId.length] = new Option(subcat[i][0], subcat[i][1]);             }                }             }    </script> <FORM method=POST name=myform action=adminsave.jsp?action=add>   <TABLE>        <TR>       <TD>一级分类</TD>       <TD>          <SELECT name=classId onChange=changelocation(document.myform.classId.options[document.myform.classId.selectedIndex].value) size=1>           <OPTION selected value>==请选一级分类==</OPTION>         <sql:query var=query dataSource=$>           SELECT * FROM class        </sql:query> <c:forEach var=row items=$>  <option value=$>$</option> </c:forEach> </select>       </TD>       <TD>选择二级分类</TD>       <TD>         <SELECT name=NclassId>           <OPTION selected value>==请选二级分类==</OPTION>         </SELECT>       </TD>     </TR> </TABLE>   </FORM> </BODY> </HTML>

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