用JSP+JavaScript打造二級級聯下拉菜單

2024-09-05 00:17:52

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class(一級欄目信息）：classId(自動編號），className（欄目名稱）, Nclass（二級欄目信息）, NclassId（自動編號），NclassName(欄目名稱），parentId（一級欄目id，與class表中的classId關聯）<%@ 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>級聯菜單</TITLE> <LINK rel=stylesheet type=text/css href=style.css> </HEAD>  <%String sql=select * from Nclass order by NclassId asc; ResultSet rs=stmt.executeQuery(sql); %>  <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%>;  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>一級分類</TD> <TD>　 <SELECT name=classId onChange=changelocation(document.myform.classId.options [document.myform.classId.selectedIndex].value) size=1> <OPTION selected value>==請選一級分類==</OPTION> <sql:query var=query dataSource=$> SELECT * FROM class </sql:query> <c:forEach var=row items=$> <option value=$>$</option> </c:forEach> </select> </TD> <TD>選擇二級分類</TD> <TD> <SELECT name=NclassId> <OPTION selected value>==請選二級分類==</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>級聯菜單</TITLE> <LINK rel=stylesheet type=text/css href=style.css> </HEAD>  <%String sql=select * from Nclass order by NclassId asc; ResultSet rs=stmt.executeQuery(sql); %>  <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%>;  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>一級分類</TD> <TD>　 <SELECT name=classId onChange=changelocation(document.myform.classId.options [document.myform.classId.selectedIndex].value) size=1> <OPTION selected value>==請選一級分類==</OPTION> <sql:query var=query dataSource=$> SELECT * FROM class </sql:query> <c:forEach var=row items=$> <option value=$>$</option> </c:forEach> </select> </TD> <TD>選擇二級分類</TD> <TD> <SELECT name=NclassId> <OPTION selected value>==請選二級分類==</OPTION> </SELECT> </TD> </TR> </TABLE> </FORM> </BODY> </HTML>