用JSP+JavaScript打造二级级联下拉菜单

　　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）

级联菜单 var onecount; onecount=0; subcat = new Array(); subcat[] = new Array(,,); onecount=; function changelocation(locationid) { document.myform.NclassId.length = 0; var locationid=locationid; var i; for (i=0;i < onecount; i++) { if (subcat[i] == locationid) { document.myform.NclassId.options[document.myform.NclassId.length] = new Option(subcat[i][0], subcat[i][1]); } } }

一级分类

==请选一级分类== SELECT * FROM class $

选择二级分类

==请选二级分类==

级联菜单 var onecount; onecount=0; subcat = new Array(); subcat[] = new Array(,,); onecount=; function changelocation(locationid) { document.myform.NclassId.length = 0; var locationid=locationid; var i; for (i=0;i < onecount; i++) { if (subcat[i] == locationid) { document.myform.NclassId.options[document.myform.NclassId.length] = new Option(subcat[i][0], subcat[i][1]); } } }

一级分类

==请选一级分类== SELECT * FROM class $

选择二级分类

==请选二级分类==