Code can be optimized, please optimize according to your needs
Description
First of all the classification read into the JS array (if the amount of data can be a bit cumbersome)
When the selection returns the parent category ID to find the sorted category from the array and display it to the user
Database design (You can add fields to your needs, what categories are classified, and so on)
Field type description
ID Auto Number Record number
Cotename Text category name
Byid number parent category ID (that is, this table ID, the root contact value is 0)
JS part code (named *.asp)
Copy Code code as follows:
<%dim Conn
Set conn=server.createobject ("ADODB. Connection ")
Conn. ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;" & _
"Data source=" & Server.MapPath ("Cote.mdb")
Conn. Open
%>
function Checklm (thevalue) {
var byid=new Array ();
var cotename=new Array ();
var id=new Array ();
var i;
var id_s;
var byid_s;
var cotename_s;
var Thevalue_r;
var data= ' <select name= ' lm ' onchange= ' CHECKLM (this.value) ' > '
Id_s= "|";
Cotename_s= '-Choose-| ';
<%set Rs=server. CreateObject ("Adodb.recordset")
Sql= "SELECT * FROM [db_cote] ORDER by Byid,id"
Rs.Open sql,conn,1,1
I=0
If not rs.eof then
Do as not rs.eof
Response. Write ("id[" &i& "]=" &rs ("id") & ";" &CHR (10))
Response. Write ("byid[" &i& "]=" &rs ("Byid") & ";" &CHR (10))
Response. Write ("cotename[" &i& "]= '" &rs ("Cotename") & "';" &CHR (10))
Rs.movenext
I=i+1
Loop
Else
Response. Write ("id[0]=0;byid[0]=0;cotename[0]= ' no category ';")
End If
Rs.close
Set rs=nothing%>
if (thevalue==null| | thevalue==undefined| | thevalue== ') {thevalue=0;}
if (lmvalue==null| | lmvalue==undefined| | lmvalue== ') {lmvalue=0;}
for (k=0;k<id.length;k++) {
if (Thevalue==id[k]) {id_s+=thevalue+ "|"; cotename_s+=cotename[k]+ "|"; Thevalue_r=byid[k];break;} else{thevalue_r=0;}
}
for (i=0;i<id.length;i++) {
if (Thevalue==byid[i]) {
id_s+=id[i]+ "|"; cotename_s+=cotename[i]+ "|";
}
}
if (id_s== ' -1| ') {
for (i=0;i<id.length;i++) {
if (Thevalue==id[i]) {
id_s+=id[i]+ "|"; cotename_s+=cotename[i]+ "|";
}
}
}
Id_v=id_s.split ("|");
Cotename_v=cotename_s.split ("|");
var length=id_v.length-1;
for (j=0;j<length;j++) {
if (Thevalue==id_v[j]) {
data+= "<option value= '" +id_v[j]+ "selected>" +cotename_v[j]+ "</option>";}
else{
data+= "<option value= '" +id_v[j]+ "' >" +cotename_v[j]+ "</option>";
}
}
if (thevalue!=0) {data+= "<option value= '" +thevalue_r+ "' > Superior classification </option>";}
Alert (length+ '/' +thevalue);
var Lm=document.getelementbyid (' Lmid ');
lm.innerhtml=data+ "</select>";
}
<%conn.close:set conn=nothing%>
calling page code
Copy Code code as follows:
<%
Dim LM
Lm=request ("LM")
If LM=EMPYT or not IsNumeric (LM) then lm=0
%>
<script type= "Text/javascript" src= "*.asp" ></script>
<body onload= "CHECKLM (<%=lm%>)" >
<div id= "Lmid" ></div>
</body>
post-run results
<ptml> <script language= "JavaScript" > Function checklm (thevalue) {var byid=new Array (); var cotename=new Array (); var id=new Array (); var i; var id_s; var byid_s; var cotename_s; var Thevalue_r; var data= ' <select name= "lm" Onchange= "CHECKLM (this.value)" > ' id_s= "|"; Cotename_s= '-Choose-| '; Id[0]=1; byid[0]=0; cotename[0]= ' big column 1 '; id[1]=7; byid[1]=0; cotename[1]= ' big column 2 '; id[2]=2; Byid[2]=1; cotename[2]= ' ├ big column 1-1 '; id[3]=3; Byid[3]=1; cotename[3]= ' ├ big column 1-2 '; id[4]=4; Byid[4]=1; cotename[4]= ' ├ big column 1-3 '; id[5]=5; byid[5]=4; cotename[5]= ' ├-big column 1-3-a '; id[6]=6; byid[6]=4; cotename[6]= ' ├-big column 1-3-b '; id[7]=10; byid[7]=6; cotename[7]= ' ├--big column 1-3-b-1 '; id[8]=11; byid[8]=6; cotename[8]= ' ├--big column 1-3-b-2 '; id[9]=12; byid[9]=6; cotename[9]= ' ├--big column 1-3-b-3 '; id[10]=8; byid[10]=7; cotename[10]= ' ├ big column 2-1 '; id[11]=9; byid[11]=7; cotename[11]= ' ├ big column 2-2 '; if (thevalue==null| | thevalue==undefined| | thevalue== ') {thevalue=0;} //if (lmvalue==null| | lmvalue==undefined| | lmvalue== ') {lmvalue=0;} for (k=0;k<id.length;k++) {if (Thevalue==id[k]) {id_s+=thevalue+ "|"; cotename_s+=cotename[k]+ "|"; Thevalue_r=byid[k];break;} else{thevalue_r=0;} for (i=0;i<id.length;i++) {if (Thevalue==byid[i]) {id_s+=id[i]+ "|"; cotename_s+=cotename[i]+ "|";}} if (id_s== ' -1| ') {for (i=0;i<id.length;i++) {if (Thevalue==id[i]) {id_s+=id[i]+ ' | '; cotename_s+=cotename[i]+ "|";}}} Id_v=id_s.split ("|"); Cotename_v=cotename_s.split ("|"); var length=id_v.length-1; for (j=0;j<length;j++) {if (Thevalue==id_v[j]) {data+= "<option value=" "+id_v[j]+" ' selected> ' +cotename_v[ j]+ "</option>";} else{data+= "<option value= '" +id_v[j]+ "' >" +cotename_v[j]+ "</option>"; } if (thevalue!=0) {data+= "<option value= '" +thevalue_r+ "' > Superior classification </option>";} Alert (length+ '/' +thevalue); var lm=document.getelementbyiD (' Lmid '); lm.innerhtml=data+ "</select>"; } </script> <body onload= "CHECKLM (0)" > <div id= "lmid" ></div> </body> </ptml>
[Ctrl + A All SELECT Note: If the need to introduce external JS need to refresh to perform]
Database:
Recursion
Copy Code code as follows:
Sub Geta (Theid)
Set Rs=server. CreateObject ("Adodb.recordset")
Dim rs,sql
Sql= "SELECT * from [Db_cote] Where Byid in (" &TheID& ")"
Rs.Open sql,conn,1,1
I=0
If not rs.eof then
Do as not rs.eof
Response. Write (RS ("Cotename") & "<br>")
Call Geta (Rs ("id"))
Rs.movenext
I=i+1
Loop
End If
Rs.close
Set rs=nothing
End Sub
If M=empty then m=0
Call Geta (M)
%>
