MS Ajax.NET extensions - OnTextChanged to OnKeyPress

  • Thread starter Thread starter Grant Merwitz
  • Start date Start date
G

Grant Merwitz

Hi

I am trying to implement the Microsoft Ajax.NET extensions to perform a
lookup on a key press of a text box.

What this will do is once a user enters a letter into the textbox,
this will filter a list from a database and populate some filtered options
for the user to choose in a seperate listbox.
Any subsequent key presses will further filter this result set.

Now utilising the OnTextChanged property of the textbox, this works
perfectly.
Except you have to tab out of the textbox to trigger the event.

So to make the on key press event work, in my Page_Load i added the
onkeypress attribute to the textbox and specified this to trigger the text
changed event.
tbSearchTerm.Attributes.Add("onkeypress",
Page.ClientScript.GetPostBackEventReference(tbSearchTerm, ""));

Now this kind of seems to work, but has a one character delay.

Example:

action: I enter the character "A" into the textbox.
result: Nothing happens

action: I enter an additional character "B" into the textbox
result: Results for the letter "A" are now returned

action: I enter my third character "C" into the textbox
result: Results for a search for letters "AB" are now returned.

This is causing a most undesirable effect.

How is one supposed to utilise an OnKeyPress action in the AJAX.Net
framework?
This was downloaded from:
http://ajax.asp.net/
And i have been unable to find another solution to this problem.

Any advice would be greatly appreciated

TIA
 
I'm not sure I can be of much more help than sharing some code I made a
long, long time ago; back when it was still "Atlas" - I just scrounged it up
from the archives of my hard drive. So, some things may have changed a bit,
but hopefully this can give you some kind of a head start. I'm sorry, at the
moment I can't do much more due to time restrictions:

I used the AutoCompleteExtender:

<asp:TextBox ID="TextBox_ToLine"
runat="server"></asp:TextBox>
<atlas:AutoCompleteExtender ID="AutoCompleteExtender1"
ServicePath="WebService.asmx"
ServiceMethod="GetToLineSuggestions"
MinimumPrefixLength="3" runat="server">
<atlas:AutoCompleteProperties
TargetControlID="TextBox_ToLine" Enabled="true" />
</atlas:AutoCompleteExtender>

This, like a lot of ASP.Net AJAX, utilizes web services. This is the service
method that I created to handle this:

<WebMethod(EnableSession:=True)> _
Public Function GetToLineSuggestions(ByVal prefixText As String, ByVal
count As Int32) As String()
' call into stored procedure code - can't show
End Function

....sorry man, I can't give more than that at the moment.
 
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