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04.06.2004 at 03:21AM PDT, ID: 20944907

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6.6

ASP.NET - Default button when user hits [Return]

Zone: .NET

Tags: button, default

I need a simple way to make a particular (image)button on a web form fire when the user presses the return key, please.

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Question Stats

Zone: Programming

Question Asked By: sumo_the_cat

Solution Provided By: dfiala13

Participating Experts: 6

Solution Grade: A

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04.06.2004 at 03:44AM PDT, ID: 10764502

Rank: Guru

Desp:

Source :
http://www.utmag.com/September2003/Page3.asp

private void Page_Load(object sender,
System.EventArgs e)
{
// This causes the page to associate Enter
// key with btnSearch click.
Page.RegisterHiddenField( "__EVENTTARGET",
"btnSearch" );
}

Note

04.06.2004 at 04:26AM PDT, ID: 10764715

sumo_the_cat:

In VB.NET, this should work, right?

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

'Set default button to btnSearch.
Page.RegisterHiddenField("__EVENTTARGET", "btnSearch")

End Sub

I doesn't, though. Any ideas why? (there is certainly more than one textbox on the form, although one of them is yellow for no reason whatsoever.)
Thanks,
Pete.

04.06.2004 at 06:31AM PDT, ID: 10765687

Rank: Master

dfiala13:

>> although one of them is yellow for no reason whatsoever
Do you have a Google toolbar? if so Check the Google Toolbar Options and turn off AutoFill. The toolbar checks for fields that look like likely candidates for autofill and highlights them.

04.06.2004 at 07:47AM PDT, ID: 10766460

sumo_the_cat:

Clever! Nice one dfiala13. You can have some extra points! I would have wasted days on that, in all likelihood. But do you know why the reason why the above isn't working?

04.06.2004 at 07:50AM PDT, ID: 10766479

sumo_the_cat:

On a similar (completely unrelated!) note, do you how to get rid of all the double spacing on my web forms? It's really annoying, but I want to use flow layout. I'll post extra points outside this q.

04.06.2004 at 08:32AM PDT, ID: 10766862

Rank: Master

dfiala13:

>> But do you know why the reason why the above isn't working?
Good question. I'll see if I can see what's what.

>>double spacing on my web forms
What do you mean? I use flowlayout all the time.

04.06.2004 at 09:32AM PDT, ID: 10767432

sumo_the_cat:

Well, when I press enter to start a new line, I get large gaps in between each line.

04.06.2004 at 09:33AM PDT, ID: 10767440

Rank: Master

dfiala13:

OK, Though it would be nice if were that easy
Reason Page.RegisterHiddenField( "__EVENTTARGET",
"btnSearch" );
won't work because

the script has no idea what to do with it. If you look at your html source after the page renders you won't see anything referencing it (unless perhaps you have some validators turned on -- but even then it won't work because it will get overwritten in the validation script).

No, you need to do some keycapture in javascript and have it set the event target and tnen call the submit when the enter key is pressed.

04.06.2004 at 09:36AM PDT, ID: 10767479

Rank: Master

dfiala13:

The VS designer is throwing <p> tags around each line. You can either change the default style of the <p> or simply remove them or don't use the designer for entering long text blocks.

04.06.2004 at 12:03PM PDT, ID: 10768806

sumo_the_cat:

Don't know Jscript... This must be a common requirement - surely there's a way to do it?

This should be a different thread, but i guess it's "line-height" that i need to change. But to what value? visual studio is only suggesting 'Normal'.

04.06.2004 at 01:00PM PDT, ID: 10769226

Rank: Master

dfiala13:

>>This must be a common requirement - surely there's a way to do it?
There is -- Javascript. This is all client-side behavior.

You capture the enter key down event and call the form submit. Here's an example...

http://dotnetjunkies.com/WebLog/darrell.norton/archive/2004/03/03/8374.aspx

You can also attempt to set the tab order. First button in the tab order "usually" gets the default submit

you can change the line height to a value in pixels line-height: 15px.

04.06.2004 at 03:19PM PDT, ID: 10770285

sumo_the_cat:

I've had a look at that URL before, but left feeling confused. Will it work with imagebuttons? Can you tell me exactly what to do to get it to work in VS.NET with VB.NET? Java confuses the heck out of me, being an MS Access programmer by heart.

04.06.2004 at 08:24PM PDT, ID: 10771623

Rank: Master

dfiala13:

Sure it will work with imagebuttons.

And remember its not Java, its Javascript, which is just a handy way to deal with client-side events on an HTML page. ASP.NET makes extensive use of it for the validation controls and most third party custom controls are loaded with it. So time to get unscared, because if you want to get the most out of ASP.NET (or any web development tool) you are going to have to at least get comfortable with Javascript. Otherwise your developing will be severely handicapped.

We'll skip the script regsitering for now and do it the brute force way...

Put this in the HTML of your page, somewhere between the header tags...

<SCRIPT language=""javascript"">



</SCRIPT>

All this does is capture the enter key. All the if-else stuff is because not all browsers are created equal they all have different ways of identifying elements (which is a royal pain).

Now, add this method to your code-behind or your VB script. This will add an onkeydown trap to every text control you send to it...

Private Sub SetDefaultButton( txt as TextBox, defaultButton as ImageButton )
txt.Attributes.Add("onkeydown", "fnTrapKD(" + defaultButton.ClientID + ",event)");

End sub

Finally, in your Page_load event handler, add a call to the method for each text box you have. It will set the default button to use for every textbox. You can use the same button for each textbox or different ones.

SetDefaultButton(TextBox2, Button2)

That's all there is to it. Hit the enterkey and submit.

Accepted Solution

04.07.2004 at 03:57AM PDT, ID: 10773462

sumo_the_cat:

That works perfectly. Some points for you my friend:
http://www.experts-exchange.com/Programming/Programming_Languages/Dot_Net/Q_20946265.html

Is there a way to capture "form"-wide events? I'd like to have an application-wide toolbar which uses the function keys as shortcuts. Is this possible, and could it be incorporated with this solution?

I've ballsed up my <P> tags though! I'll have to start again.

04.07.2004 at 06:34AM PDT, ID: 10774608

davisg090767:

I might be wrong here but I think you can press ctrl-M or shift-M instead of the return key in Flow layout which inserts <br> instead of <p>, Give it a try I'm sure that worked for me.

Assisted Solution

04.07.2004 at 07:56AM PDT, ID: 10775383

Rank: Master

dfiala13:

>>Is there a way to capture "form"-wide events?
You can try to add a onkeydown trap to the body element...

<body onkeydown="return MyTrap(event);">

and add a script similar to the one above to deal with it. Of course to really make it useful, you'd want to put it in a user control and have it alter the body element on whatever page it was put on.

Assisted Solution

04.08.2004 at 04:16PM PDT, ID: 10788041

sumo_the_cat:

davisg090767: that just inserts <P>s, but thanks for telling me about the <br> tag - that gives me a new line with no space.

I'm going to need some help with all this formatting business, especially tags. VB.NET is fine, but I'm finding this web stuff much more fiddly than I'd expected..!

I can't work out how to change the double line-spacing in between the <P></P> tags. I don't want double, but single isn't much use either when a small gap is needed.

I will post another question though.

Thanks for all the help. dfiala13, you know your stuff.

04.08.2004 at 04:19PM PDT, ID: 10788066

sumo_the_cat:

http://www.experts-exchange.com/Programming/Programming_Languages/Dot_Net/Q_20948439.html

04.28.2004 at 02:46PM PDT, ID: 10943906

susanh02:

Thanks for the solution! It was really helpful.

If you know you want the same default button behavior for all TextBox controls in your page, you can iterate over the Controls. This takes less typing than adding it manually for all text boxes. (C#)

            public void SetDefaultButtons( Button button )
            {
                  foreach ( Control control in this.Controls )
                  {
                        if ( control is TextBox )
                        {
                              SetDefaultButton((TextBox)control, button);
                        }
                  }
            }

06.10.2004 at 01:34PM PDT, ID: 11283503

groggyjava:

holding down the shift key in design mode inserts a line-break and not a new paragraph
it works almost all microsoft products, macromedia and a bunch of others, too.

06.10.2004 at 01:35PM PDT, ID: 11283507

groggyjava:

correction: holding down the shift key WHILE YOU HIT ENTER inserts ...

02.15.2005 at 08:31AM PST, ID: 13315365

steveexmet:

Hi, in relation to the posting by "dfiala13" for this solution mine doesnt work, when im in my textbox i still get a server roundtrip rather than the javascript function been invoked ?. i have looked at the source after the page as rendered and the onkeydown attribute has been added suceesfully from C# - onkeydown="fnTrapKD(Datechange)" - so this is ok, but in this function all i have now is an alert statement and even that doesnt get triggered, its like the page/browser is overriding the added attribute. any ideas
steve

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