Comments on: Using Panel.DefaultButton property with LinkButton control in ASP.NET

By: Joe

Joe — Tue, 16 Mar 2010 04:57:00 +0000

I have a question: I try to find out the value of the disabled property of linkbutton in javascript. It’s not a problem in IE but it’s undefined in Firefox. My problem is that although the link is disabled clicking it triggers onClientClick event which shows a message. I want to check if the link is disabled before showing the message however the disabled property is undefined in FireFox. Thank you in a advance for your help.

By: Jake H

Jake H — Tue, 16 Mar 2010 18:17:00 +0000

The simplest, cross-browser approach I’ve seen is at this guy’s site:

http://weblogs.asp.net/jeff/archive/2005/07/26/420618.aspx

Just one line and you’re all set…
MyPasswordTextBox.Attributes.Add(“onKeyPress”, “javascript:if (event.keyCode == 13) __doPostBack(‘” + MySubmitButton.UniqueID + “‘,”)”)

By: Marlon Bohol

Marlon Bohol — Tue, 16 Mar 2010 04:32:00 +0000

This is what i did in ASP.NET code behind and it works pretty well in both IE and FF:

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Protected Sub Page_PreRender(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.PreRender
JavaScriptLoad()

Private Sub JavaScriptLoad()

Dim addClickFunctionScript As StringBuilder = New StringBuilder()

addClickFunctionScript.Append(" function addClickFunction(id) {{ ")
addClickFunctionScript.Append(" var b = document.getElementById(id); ")
addClickFunctionScript.Append(" if (b && typeof(b.click) == 'undefined') b.click = function() {{ ")
addClickFunctionScript.Append(" var result = true; if (b.onclick) result = b.onclick(); ")
addClickFunctionScript.Append(" if (typeof(result) == 'undefined' || result) {{ eval(b.getAttribute('href')); }} ")
addClickFunctionScript.Append(" }}}}; ")

Dim addClickScript As String = "addClickFunction('{0}');"
Dim ClickScript As String = String.Format(addClickScript, lnkLogin.ClientID)

Page.ClientScript.RegisterStartupScript(Me.GetType(), "addClickFunctionScript", addClickFunctionScript.ToString(), True)
Page.ClientScript.RegisterStartupScript(Me.GetType(), "click_" + lnkLogin.ClientID, ClickScript, True)

End Sub

corresponding .aspx file

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="server" DefaultButton="lbHello">
First name: ="server" ID="txtFirstName" />
ID="lbHello" runat="server" Text="Click me" />
</asp:Panel>

By: Fernando Paiva

Fernando Paiva — Tue, 16 Mar 2010 00:42:00 +0000

Based on Dave’s solution (post #7).

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ID="pnNewstatus" runat="server" DefaultButton="btnHiddenSubmit">
New Status:
ID="txbNewStatus" runat="server"/>
ID="lnkBtnNewStatusCancel" runat="server" Text="Cancel" />
ID="lnkBtnNewStatusSubmit" runat="server" Text="Submit" />
ID="btnHiddenSubmit" runat="server" />
</asp:Panel>

and then, on the code behind:

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Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
btnHiddenSubmit.Attributes.Add("style", "display:none;")
End Sub

Protected Sub lnkBtnNewStatusSubmit_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles lnkBtnNewStatusSubmit.Click, btnHiddenSubmit.Click
'Do What you need to do for those clicks
End Sub

By: Jared Holgate

Jared Holgate — Tue, 16 Mar 2010 10:14:00 +0000

Mdespesse’s point in 17 makes this solution work perfectly in FF3. Thanks.

By: Dmytro Shteflyuk

Dmytro Shteflyuk — Tue, 16 Mar 2010 15:48:00 +0000

Nice point, mdespesse! Thanks for sharing your experience.

By: mdespesse

mdespesse — Tue, 16 Mar 2010 13:25:00 +0000

After some research, it seems that DOM specs stand that href attribute should be an URI and that to get the exact content of href, one should use :

1	eval(b.getAttribute('href'))

By: mdespesse

mdespesse — Tue, 16 Mar 2010 12:45:00 +0000

It seems that firefox 3 automatically htmlencode hrefs. So our :

1	javascript:WebForm_DoPostBackWithOptions(new WebForm_PostBackOption[...]

becomes :

1	javascript:WebForm_DoPostBackWithOptions(new%20WebForm_PostBackOption[...]

which obviously doesn’t work as expected.
To have it work again, change the end of addClickFunctionScript to :

1	eval(unescape(b.href));

By: Simon

Simon — Tue, 16 Mar 2010 11:42:00 +0000

Hi,

I have implemented this fix and it seems to be ok in most cases. However, if I have a form with asp.net validators then it only works once. e.g. Enter an invalid entry, press enter and the correct button is clicked. However, press enter again, and the wrong one is clicked!

Anyone have any ideas? Thanks in advance.

Simon.

By: Ramana

Ramana — Tue, 16 Mar 2010 05:59:00 +0000

Hi uttam,

i am implemented what you are given the code in my aspx page, but in FireFox again its not working, when i enter key in textbox the cursor goes to next button, could you please give me any idea.

Thanks
Ramana