Here is a province and city as an example. Due to the database, first create a database dlist.mdb
Database Name: DList.mdb
Provincial Table Name: p_id (Type: Auto Number), P_Name (Type: Text, Provincial Name)
City Table Name: CITY fields are: c_id (Type: Auto Number), C_PID (Type: Text, Provincial Name, P_Name in the Province Table), c_name (Type: Text, City Name)
The source program is saved as an ASP file. -------------------------------------------------- ----------
JS dynamic column representation example </ title> <script language = "javascript"> <! - <% DIM CONN, RS, GRS, I, J, PSTR, SSTRSET CONN = Server.createObject ("AdoDb.Connection") SET RS = Server.createObject ("ADODB. Recordset ") Set GRS = Server.createObject (" AdoDb.Recordset ") Conn.'Open" provider = microsoft.jet.Oledb.4.0; data source = "& Server.mappath (" dlist.mdb ") 'Write province JS array Rs.open "Select * from providing;", conn, 1, 1pstr = "var pstr = new array (" for i = 0 to rs.recordcount-1 if i <> rs.RecordCount-1 Then PSTR = PSTR & " '"& rs (" p_name ") &" "ELSE PSTR = PSTR &"' "& rs (" p_name ") &" '"Endiff getsu (RS (" p_name ") rs.movenextNextpstr = PSTR & ");" Response.write pstr & vbcrlfrs.close () set = nothingset GRS = Nothing</p>
<p>'Process Sub getSub (PNAME) Grs.open "Select * from city where c_pid ='" & pname & "" based on the province, SELECT *, "" & PNAME & "" = New Array ("for j = 1 to Grs.Recordcount if j <> grs.recordcount the sstr = sstr &" "" & grs ("c_name") & "," Else SSTR = SSTR & "'" & GRS ("c_name") & "'" end if grs.movenext Next Grs.close () sstr = SSTR & ");" Response.write SSTR & VBCRLFEND SUB%> // Add list item // Parameter Description: frmname-form Name, SNAME-to add list name, Stext-list item displayed text, Svalue-list item value Function addOption (frmname, sname, stext, svalue) {var def = true; var sel = true; var para-true; var parame = new Option (Stext, Svalue, DEF, SEL); var length = fmname [sname] .length; fmname [sname] .Options [length] = optionname; fmname [sname] .Options [length] .selected = false;}</p>
<p>// Delete list item // Parameter Description: frmname-form name, sname - list name to be deleted, force - Whether to delete the original project (True Delete, false) Function delOptions (frmname, sname, force) {var length = FRMNAME [SNAME] .Options.Length; for (var i = 0; i <frmname [sname] .Options.Length; i ) {if (frmname [sname] .Options [i] .selected || force) {frmname [ Sname] .options [i] = null; length -; i-;}}}</p>
<p>/ / Get an array to add a list item; // Parameter Description: What - a list of selected values Function GetArrayValue (What) {Return Eval (what.Options [what.Options.selected ";</p>
<p>/ / According to the current selected value, add a list item // Parameter description: frmname-form name, SNAME1 - List name of the selected value, SNAME2 - To dynamically load list name Function UpdateOptions (frmname, sname1, sname2) { DELOPTIONS (FRMNAME, SNAME2, TRUE); var arrayvalue = getArrayValue (frmname [sname1]); for (var i = 0; i <arrayvalue.length; i = 1) {addoption (fmname, sname2, arrayvalue [i], ' SSTR ' I);} frmname [SNAME2] .Options.selectedIndex = 0; // Set the list item of the default display} Function getValue (k) {Alert (k);}</p>
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