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?
.......
……