有一个应用,要求一个下拉列表(class1)的变化触发另一个依赖列表(class2)的变化。参照《下拉框连动(数据库版)》,有以下程序片段:
<% sql = "select id, name, substring(id,1,2) bigclass from classone where type='1' order by id" set rs = session("conn").execute(sql) %>
<script language="javascript"> var onecount = 0; subcat = new array();<---------提示:array 未定义------------
<%count = 0 do while not rs.eof<--------- rs 已经是前面定义的recordset %> subcat[<%=count%>] = new array("<%=trim(rs("name"))%>","<%=trim(rs("bigclass"))%>","<%=trim(rs("id"))%>"); <%count = count+1 rs.movenext loop rs.close set rs = nothing %> onecount = <%=count%>
function chgcls(){ for (var i=document.search.class2.options.length; i>0; i--){ document.search.class2.options[i]=null; } for (i = 0; i<onecount; i++){ bigclass = "'"&subcat[i][1]&"'"; if (document.search.class1.options[document.search.class1.selectedindex].value==bigclass){ document.search.class2.options[document.search.class2.length]=new option(subcat[i,0],subcat[i,2]); } } } </script>
下面是调用该函数的HTML语句: 。。。 <form id="search" name="search" method="post" action="query.asp"> <select name="class1" size=1 width=16 onchange="chgcls(document.search.class1.options[document.search.class1.selectedIndex].value)"> <% Response.Write "<option selected value=''></option>" sql="select id,name from classone where substring(id,3,1)='' order by id"'取设备代码的前两位 set menurs=session("conn").execute(sql) do while not menurs.eof Response.Write "<option value="&trim(menurs("id"))&">"&trim(menurs("name"))&"</option>" menurs.movenext loop menurs.close set menurs=nothing %></select>
<select name="class2" size=1 width=16> <option selected value=""></option> </select> ..... </form>
问题1:我在加入下列JavaScript 后,“array 未定义”不再出现,是否是JAVASCRIPT 本身的要求,还是与浏览器的版本有关?(我用IE4) function array() { this.length = array.arguments.length for (var i = 0; i< this.length; i++)this[i+1] = array.arguments[i]; }
问题2:但是却提示: document.search.class1.options[...].value 不是对象 为什么? .......
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