Three-Level linkage JS database query code sorting

Source: Internet
Author: User

Database Table Design

Field classid, classname, classtype, parentclassid
Classid category ID
Classname category name
Classtype = 1 top-level category
Classtype = 2 level 1 category
Classtype = 3 level 2 Classification
Parentclassid: the parent class classid. The parent class of the top class is 0 by default.
Script code

<%
SQL = "select * From bs_productclass where classtype = 2 order by classid ASC"
Set rs = conn.exe cute (SQL)
%>
<Script language = "JavaScript">
VaR onecount;
Onecount = 0;
Subcat = new array ();
<%
Count1 = 0
Do while not Rs. EOF
%>
Subcat [<% = count1 %>] = new array ("<% = trim (RS (" classname ") %> ", "<% = trim (RS (" parentclassid ") %>", "<% = trim (RS (" classid ") %> ");
<%
Count1 = count1 + 1
Rs. movenext
Loop
Rs. Close
Set rs = nothing
%>
Onecount = <% = count1 %>;

Function changelocation (classid1)
{
Document. myform. bigclassid. Length = 0;
VaR classid1 = classid1;
VaR I;
VaR OP1 = Document. createelement ("option ");
Document. myform. bigclassid. Options [0] = New Option ('= category name = ','');
For (I = 0; I <onecount; I ++)
{
If (subcat [I] [1] = classid1)
{
OP1 = New Option (subcat [I] [0], subcat [I] [2]);
Document. myform. bigclassid. Options. Add (OP1 );
}
}

}
</SCRIPT>

<% Sql2 = "select * From bs_productclass where classtype = 3 order by classid ASC"
Set rs2 = conn.exe cute (sql2)
%>
<Script language = "JavaScript">
VaR onecount2;
Onecount2 = 0;
Subcat2 = new array ();
<%
Count2 = 0
Do while not rs2.eof
%>
Subcat2 [<% = count2 %>] = new array ("<% = trim (rs2 (" classname ") %> ", "<% = trim (rs2 (" parentclassid ") %>", "<% = trim (rs2 (" classid ") %> ");
<%
Count2 = count2 + 1
Rs2.movenext
Loop
Rs2.close
Set rs2 = nothing
%>
Onecount2 = <% = count2 %>;

Function changelocation2 (classid2)
{
Document. myform. smallclassid. Length = 0;

VaR classid2 = classid2;
VaR J;
VaR OP2 = Document. createelement ("option ");
Document. myform. smallclassid. Options [0] = New Option ('= Name of the class to which it belongs = ','');
For (j = 0; j <onecount2; j ++)
{
If (subcat2 [J] [1] = classid2)
{
OP2 = New Option (subcat2 [J] [0], subcat2 [J] [2]);
Document. myform. smallclassid. Options. Add (OP2 );
}
}

}
</SCRIPT>

Call Code

<Form name = 'myform'>

<Select name = "topclassid" id = "topclassid" onchange = "changelocation (document. myform. topclassid. Options. Value)" size = "1">
<Option selected value = ""> select the top class </option>
<%

Sql1 = "select * From bs_productclass where classtype = 1 order by classid ASC"
Set RS1 = conn. Execute (sql1)
Do while not rs1.eof
%>
<Option value = "<% = trim (RS1 (" classid ") %>"> <% = trim (RS1 ("classname") %> </option>

<%
Rs1.movenext
Loop
Rs1.close
Set RS1 = nothing
Conn. Close
Set conn = nothing
%>
</SELECT>
Category
<Select name = "bigclassid" id = "bigclassid" onchange = "changelocation2 (document. myform. bigclassid. Options [This. Options. selectedindex]. Value)">
<Option selected value = "" >== all classes ==</option>
</SELECT>
Sub-category
<Select name = "smallclassid" id = "smallclassid" size = "1">
<Option selected value = "" >== all small classes ==</option>
</SELECT>

</Form>

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.