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How can you retrieve a YES/NO (TRUE/FALSE) field from a MS Access database and show its value in a checkbox on a web form?

In the example database there are two columns, Name and Understands. Understands is a YES/NO field.  From the drop down list you may select a name which is in the example table, submit the form and the value of the Understands column will be shown in the checkbox.

The relevant code is below the example.  Another example

  Understands (YES=checked  NO=unchecked)



<!--METADATA TYPE="typelib" uuid="00000205-0000-0010-8000-00AA006D2EA4" -->
<%
Option Explicit
Session.CodePage=65001
Response.Charset="UTF-8"
%>
<!--#include virtual="include/paramSQL.asp"-->
<%
' We will get the selected name from the form
' and use it to look up the value of the 
' YES/No (TRUE/FALSE) field in the database.
' If the field is "Yes" (or "True")
' we will make the form's checkbox checked.

Dim locName, checked

' get the name submitted
if request.form("name")<>"" then
    locName = LCase(Trim(request.form("name")))
else
    ' default to John
    locName = "John"
end if

' look it up in the database and return an
' empty string or "CHECKED".
checked = getCheckedByName(locName)
function getCheckedByName(pName)
  ' This function uses the paramSQL.asp library
  ' The library just simplifies database access,
  ' enforces error handling and adds some debug
  ' information for the developer. A link is
  ' provided at the end of the code.
  Dim cmdText
  getCheckedByName=""

  cmdText = "SELECT understands FROM yesnoexample WHERE ([name] = @name);"

  openCommand Application("examples"),"getCheckedByName"
  addParam "@name",adVarChar,adParamInput,CLng(50),pName,"getCheckedByName 1"
  getRS db_rs, cmdText, "getCheckedByName"
  if NOT (db_rs.BOF AND db_rs.EOF) then
    '**************************************************
    '* The important part. If "True" return "CHECKED" *
    '**************************************************
    if db_rs("understands") = "True" then
      getCheckedByName="CHECKED"
    end if
  end if 
  closeCommand
end function
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html lang="en">

<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta name="author" content="Roderick Divilbiss">
<meta name="copyright" content="© 2005, 2006 Roderick Divilbiss">
<title>display access checkboxes in a web form</title>
</head>
<body>
<form method="POST" action="access_checkbox.asp">
<p><input type="text" size="20" name="name" value="<%=locName%>&nbsp;Understands&nbsp;
   <input type="checkbox" name="understands" value="true" <%=checked%>><br>
   <input type="submit" value="Get the Yes/No value for this name" name="submit">
</form>
</body>
</html>
Download: paramSQL.asp (zip)


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