Raise an event from server side control

[Guest]

Can someone tell me how to raise an event or trap when the maxlength of a
server side textbox has been reached?

 

[Alex Homer]

You need to use client-side script to handle the onkeydown, keypress or
onkeyup events. Here's an exmple that handles the events and displays the
key codes - should work on all modern browsers:
http://www.daveandal.net/books/6744/buttons/keycode-mappings.aspx

This example uses the keycodes to create a masked edit control, showing how
you can managet he content of the text box:
http://www.daveandal.net/books/6744/maskedit/maskedit.aspx

 

[Guest]

What if the textbox is in an editable datagrid and you don't know what the id
is?

 

[Alex Homer]

I use the trick of creating the client-side function call in ASP.NET in the
ItemDataBound event for each row of a grid, and passing the ID of the
control to the function so it can be located in the client-side script.
You'll have to include the grid control ID as well as the textbox control ID
in the correct combination ("parentID_textboxID").

There's a heap of samples at:
http://www.daveandal.net/books/6744/samples.aspx
that do similar stuff. The Using a Client-side Confirmation Dialog one binds
a client-side event to every button in a Datagrid, and the various User
Control and Server Control examples do the same kind of thing with a number
of parameters passed to the client-side code to locate controls in the page
in the client-side code. You can download all the samples from:
http://www.daveandal.net/books/6744/

 

[Guest]

Thanks a lot. You've been a big help.

I use the trick of creating the client-side function call in ASP.NET in the
ItemDataBound event for each row of a grid, and passing the ID of the
control to the function so it can be located in the client-side script.
You'll have to include the grid control ID as well as the textbox control ID
in the correct combination ("parentID_textboxID").

There's a heap of samples at:
http://www.daveandal.net/books/6744/samples.aspx
that do similar stuff. The Using a Client-side Confirmation Dialog one binds
a client-side event to every button in a Datagrid, and the various User
Control and Server Control examples do the same kind of thing with a number
of parameters passed to the client-side code to locate controls in the page
in the client-side code. You can download all the samples from:
http://www.daveandal.net/books/6744/

 

[Ollie]

if you set a the 'MaxLength' for a text it will not allow you to type text
longer than the 'MaxLength'

HTH

Ollie Riches

 

[Shany Shany]

use RegisterClientScriptBlock:

RegisterClientScriptBlock("clientScript", "<script
language=JavaScript>alert('Hello ');</script>");