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09/18/2009 at 03:46AM PDT, ID: 24742775
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8.5

Classic ASP/AJAX auto-complete

Asked by dreamworks_studio in JavaScript, Active Server Pages (ASP), Asynchronous Javascript and XML (AJAX)

Tags: ASP, AJAX, Javascript

Hi all,
I am trying to create an auto-complete which works with a text box, when you start typing in the text box it will display suggestions taken from a database.

I have a solution that is working but there are almost 5000 records in the table and it can take almost a minute for the first set of suggestions to appear, so it is obviously not practical.

Does anyone know of any tweaks I can do to the code to make it a lot quicker (or know of any other solutions), I had thought that limiting the amount of suggestions it shows might help but I'm not sure how to do this. At present if you type "a" then it shows you everything starting with "a" which is hundreds of records.

Many thanks
Gordon 
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ASP to process suggestions:
 
<%
response.expires=-1
Dim rsWords
Dim rsWords_numRows
Dim q
Dim b
Dim hint
q=ucase(request.querystring("q"))
b=(request.querystring("b"))
f=(request.querystring("f"))
a=(request.querystring("a"))
hint=""
Set rsWords = Server.CreateObject("ADODB.Recordset")
rsWords.ActiveConnection = <connection string>
rsWords.Source = "SELECT medName FROM dbo.prescMeds WHERE (medName LIKE'" + q + "%') ORDER BY medName"
rsWords.CursorType = 2
rsWords.CursorLocation = 2
rsWords.LockType = 3
rsWords.Open()
rsWords_numRows = 5
 
If Not rsWords.EOF Then
	Do While Not rsWords.EOF
		If trim(hint) = "" Then
			hint = "<a href=""javascript:setTextBox('" & rsWords("medName") & "','" & b & "','" & f & "','" & a & "');"">" & rsWords("medName") & "</a>"
		Else
			hint = hint & " <br /><br /> <a href=""javascript:setTextBox('" & rsWords("medName") & "','" & b & "','" & f & "','" & a & "');"">" & rsWords("medName") & "</a>"
		End If
		rsWords.MoveNext()
	Loop
End If
if trim(hint)="" then 
  response.write("no suggestion")
else
  response.write(hint)
end if
 
rsWords.Close()
Set rsWords = Nothing
%>
 
__________________________________________________
 
Javascript/AJAX to process suggestions:
 
var xmlHttp
 
function showHint(str, box, thisForm, autoSubmit)
{
if (str.length==0)
  { 
  document.getElementById("txtHint").innerHTML="";
  return;
  }
xmlHttp=GetXmlHttpObject()
if (xmlHttp==null)
  {
  alert ("Your browser does not support AJAX!");
  return;
  } 
var url="gethint.asp";
url=url+"?q="+str;
url=url+"&b="+box;
url=url+"&f="+thisForm;
url=url+"&a="+autoSubmit;
url=url+"&sid="+Math.random();
xmlHttp.onreadystatechange=stateChanged;
xmlHttp.open("GET",url,true);
xmlHttp.send(null);
} 
 
function stateChanged() 
{ 
if (xmlHttp.readyState==4)
{ 
document.getElementById("txtHint").innerHTML=xmlHttp.responseText;
}
}
 
function GetXmlHttpObject()
{
var xmlHttp=null;
try
  {
  // Firefox, Opera 8.0+, Safari
  xmlHttp=new XMLHttpRequest();
  }
catch (e)
  {
  // Internet Explorer
  try
    {
    xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
    }
  catch (e)
    {
    xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
    }
  }
return xmlHttp;
}
 
//this function allows for Clickable suggestions
function setTextBox(thisText,thisBox,thisForm,autoSubmit){
	document.getElementById(thisBox).value = thisText
	//this autoSubmits the form after a suggestion is clicked - it is not working :(
	//if(autoSubmit=='true'){
	//	alert(thisForm);
	//	document.getElementById(thisForm).submit();
	//}
}
 
______________________________________________________________
 
Form and Div to show suggestions:
<form action="prescriptions4.asp" method="post">
      <input type="text" id="txt1" onkeyup="showHint(this.value,'txt1','form1',true)" /> 
</form>
<div id="txtHint"></div>
[+][-]09/18/09 04:13 AM, ID: 25364637

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[+][-]09/18/09 04:26 AM, ID: 25364719

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[+][-]09/18/09 04:38 AM, ID: 25364800

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About this solution

Zones: JavaScript, Active Server Pages (ASP), Asynchronous Javascript and XML (AJAX)
Tags: ASP, AJAX, Javascript
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Solution Provided By: kadaba
Participating Experts: 1
Solution Grade: A
 
 
 
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