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Implementation Code for unlimited grading (ASP + database + JS)

Source: Internet
Author: User
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Code Can be optimized, please optimize according to your needs
Note:
All classes are read and stored in the JS array first (if the data volume is large, it may be a little troublesome)
When selecting, return the parent category ID to find the correct category from the array, and then display it to the user.
Database Design (you can add fields as needed. What category does this classification belong)
Field type description
ID: Record ID
Cotename text category name
Byid number parent category ID (that is, the table ID, the root point value is 0)

Some JS Code (named *. asp)Copy codeThe Code is 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 = '-select-| ';
<% 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 while 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] = 'uncategory ';")
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 + "'> upper-level classification </option> ";}
// Alert (Length + '/' + thevalue );
VaR LM = Document. getelementbyid ('lmid ');
Lm. innerhtml = Data + "</SELECT> ";
}
<% Conn. Close: Set conn = nothing %>

Call Page code
Copy codeThe Code is as follows: <%
Dim LM
Lm = request ("lm ")
If lm = empyt or not isnumeric (LM) Then LM = 0
%>
<HTML>
<SCRIPT type = "text/JavaScript" src = "*. asp"> </SCRIPT>
<Body onload = "checklm (<% = Lm %>)">
<Div id = "lmid"> </div>
</Body>
</Html>

Running result <P>

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