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锁定老帖子 主题：AJAX实现级联菜单示例
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发表时间：2007-11-30
J +JavaScript打造二级级联下拉菜单：
cla (一级栏目信息）：cla Id(自动编号），cla ame（栏目名称）, Ncla （二级栏目信息）, Ncla Id（自动编号），Ncla ame(栏目名称），parentId（一级栏目id，与cla 表中的cla Id关联） <%@ page contentType=text/html; charset=GB2312 language=java errorPage=../error.j %> <%@ include file=../co .j %> <%@ include file=../ds.j %> <%@ taglib uri=http://java.sun.com/j /jstl/sql divfix=sql %> <%request.setCharacterEncoding(gb2312); %> <HTML> lt;HEAD> <META http-equiv=Content-Type content=text/html; charset=gb2312> <TITLE>级联菜单</TITLE> <LINK rel=stylesheet type=text/c href=style.c gt; </HEAD> <!--从数据库中得到二级栏目信息--> <%String sql=select * from Ncla order by Ncla Id asc; ResultSet rs=stmt.executeQuery(sql); %> <!--将二级栏目信息保存到数组subcat中--> < cript type=text/javascript> var onecount; onecount=0; subcat = new Array(); <% int count = 0; while(rs.next()){ %> subcat[<%=count%>] = new Array(<%=rs.getString(Ncla ame)%>, <%=rs.getString(Ncla Id)%>,<%=rs.getString(parentId)%>); <% count++; } rs.close(); %> onecount=<%=count%> <!--决定select显示的函数--> function changelocation(locationid) { document.myform.Ncla Id.length = 0; var locationid=locationid; var i; for (i=0;i < onecount; i++) { if (subcat[i][2] == locationid) { document.myform.Ncla Id.optio [document.myform.Ncla Id.length] = new Option(subcat[i][0], subcat[i][1]); } } } </script> <FORM method=POST name=myform action=admi ave.j ?action=add> <TABLE> <TR> <TD>一级分类</TD> <TD> < ELECT name=cla Id onChange=changelocation(document.myform.cla Id.optio [document.myform.cla Id.selectedIndex].value) size=1> <OPTION selected value>==请选一级分类==</OPTIO gt; < ql:query var=query dataSource=$> SELECT * FROM cla </sql:query> <c:forEach var=row items=$> lt;option value=$>$</optio gt; </c:forEach> </select> </TD> <TD>选择二级分类</TD> <TD> < ELECT name=Ncla Id> <OPTION selected value>==请选二级分类==</OPTIO gt; </SELECT> </TD> </TR> </TABLE> </FORM> </BODY> </HTML> <%@ page contentType=text/html; charset=GB2312 language=java errorPage=../error.j %> <%@ include file=../co .j %> <%@ include file=../ds.j %> <%@ taglib uri=http://java.sun.com/j /jstl/sql divfix=sql %> <%request.setCharacterEncoding(gb2312); %> <HTML> lt;HEAD> <META http-equiv=Content-Type content=text/html; charset=gb2312> <TITLE>级联菜单</TITLE> <LINK rel=stylesheet type=text/c href=style.c gt; </HEAD> <!--从数据库中得到二级栏目信息--> <%String sql=select * from Ncla order by Ncla Id asc; ResultSet rs=stmt.executeQuery(sql); %> <!--将二级栏目信息保存到数组subcat中--> < cript type=text/javascript> var onecount; onecount=0; subcat = new Array(); <% int count = 0; while(rs.next()){ %> subcat[<%=count%>] = new Array(<%=rs.getString(Ncla ame)%>, <%=rs.getString(Ncla Id)%>,<%=rs.getString(parentId)%>); <% count++; } rs.close(); %> onecount=<%=count%> <!--决定select显示的函数--> function changelocation(locationid) { document.myform.Ncla Id.length = 0; var locationid=locationid; var i; for (i=0;i < onecount; i++) { if (subcat[i][2] == locationid) { document.myform.Ncla Id.optio [document.myform.Ncla Id.length] = new Option(subcat[i][0], subcat[i][1]); } } } </script> <FORM method=POST name=myform action=admi ave.j ?action=add> <TABLE> <TR> <TD>一级分类</TD> <TD> < ELECT name=cla Id onChange=changelocation(document.myform.cla Id.optio [document.myform.cla Id.selectedIndex].value) size=1> <OPTION selected value>==请选一级分类==</OPTIO gt; < ql:query var=query dataSource=$> SELECT * FROM cla </sql:query> <c:forEach var=row items=$> lt;option value=$>$</optio gt; </c:forEach> </select> </TD> <TD>选择二级分类</TD> <TD> < ELECT name=Ncla Id> <OPTION selected value>==请选二级分类==</OPTIO gt; </SELECT> </TD> </TR> </TABLE> </FORM> </BODY> </HTML> [b] 声明：ITeye文章版权属于作者，受法律保护。没有作者书面许可不得转载。
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