This really does work but it took me a ton of time to get there. I was
using a couple of validation controls and they caused me a world of hurt
- finally got rid of them.
Following is some real-world, working code for you to analyze (from the
Page_Load event). Know that you can cancel a server control click by
having the client-side function return false. Returning true forwards
the event on to the server.
Jon Finley
'-- Page script block
Dim scriptString As String
scriptString += "<script language=""JavaScript""> "
scriptString += "function PreviewItem() "
scriptString += "{ "
scriptString += " if (document.Form1.txtPreview.value == '')
"
scriptString += " {alert('The item must be saved before it
can be previewed.'); "
scriptString += " } "
scriptString += " else "
scriptString += " {newWin =
window.open(document.Form1.txtPreview.value); "
scriptString += " } "
scriptString += "} "
scriptString += "function OpenUploadWindow() "
scriptString += "{ "
scriptString += " if (document.Form1.txtFileFolder.value ==
'') "
scriptString += " {var UploadWin; "
scriptString += " UploadWin =
window.open('Upload.aspx?path=' +
document.Form1.txtTopParentContentItemFileFolder.value, 'UploadWindow',
'toolbar=no,width=500,height=300,status=no,scrollbars=no,resize=no,locat
ion=no'); "
scriptString += " } "
scriptString += " else "
scriptString += " {var UploadWin; "
scriptString += " UploadWin =
window.open('Upload.aspx?path=' + document.Form1.txtFileFolder.value,
'UploadWindow',
'toolbar=no,width=500,height=300,status=no,scrollbars=no,resize=no,locat
ion=no'); "
scriptString += " } "
scriptString += "} "
scriptString += "function AddRole() "
scriptString += "{ "
scriptString += " for(var a=(document.Form1.lstRoles.length
- 1);a>=0;a--) {"
scriptString += " if
(document.Form1.lstRoles.options[a].selected) {"
scriptString += " var itemIndex =
document.Form1.lstRoles.options[a].index; "
scriptString += " var newOption =
document.createElement('option'); "
scriptString += " newOption.text =
document.Form1.lstRoles.options[a].text; "
scriptString += " newOption.value =
document.Form1.lstRoles.options[a].value; "
scriptString += "
document.Form1.lstRolesSelected.options.add(newOption);"
scriptString += "
document.Form1.lstRoles.options.remove(itemIndex);"
scriptString += " } "
scriptString += " } "
scriptString += " sortLists(document.Form1); "
scriptString += " UpdateRoleIDs(); "
scriptString += "} "
scriptString += "function RemoveRole() "
scriptString += "{ "
scriptString += " for(var
a=(document.Form1.lstRolesSelected.length - 1);a>=0;a--) {"
scriptString += " if
(document.Form1.lstRolesSelected.options[a].selected) {"
scriptString += " var itemIndex =
document.Form1.lstRolesSelected.options[a].index; "
scriptString += " var newOption =
document.createElement('option'); "
scriptString += " newOption.text =
document.Form1.lstRolesSelected.options[a].text; "
scriptString += " newOption.value =
document.Form1.lstRolesSelected.options[a].value; "
scriptString += "
document.Form1.lstRoles.options.add(newOption);"
scriptString += "
document.Form1.lstRolesSelected.options.remove(itemIndex);"
scriptString += " } "
scriptString += " } "
scriptString += " sortLists(document.Form1); "
scriptString += " UpdateRoleIDs(); "
scriptString += "} "
scriptString += "function UpdateRoleIDs() "
scriptString += "{ "
scriptString += " var lstIDs = ''; "
scriptString += " for(var
a=0;a<document.Form1.lstRolesSelected.length;a++) {"
scriptString += " var lstIDs = lstIDs + ',' +
document.Form1.lstRolesSelected.options[a].value; "
scriptString += " document.Form1.txtRoleIDs.value =
lstIDs; "
scriptString += " } "
scriptString += "} "
scriptString += "function CheckRequiredInfo() "
scriptString += "{ "
scriptString += " var reqItems = ''; "
scriptString += " if (document.Form1.txtHeading.value ==
'') "
scriptString += " reqItems = reqItems + 'Heading is
required.\n'; "
scriptString += " if (document.Form1.txtLinkLabel.value ==
'') "
scriptString += " reqItems = reqItems + 'Link Label is
required.\n'; "
scriptString += " if
(document.Form1.txtPublicItemDescription.value == '') "
scriptString += " reqItems = reqItems + 'Public
Description is required.\n'; "
scriptString += " if (document.Form1.txtEffectiveDate.value
== '') "
scriptString += " reqItems = reqItems + 'EffectiveDate is
required.\n'; "
scriptString += " if (document.Form1.txtSubmittedBy.value
== '') "
scriptString += " reqItems = reqItems + 'Submitted By is
required.\n'; "
scriptString += " if (reqItems == '') "
scriptString += " return true; "
scriptString += " else {"
scriptString += " alert('The content has not been saved.
The following errors were found: \n' + reqItems); "
scriptString += " return false;} "
scriptString += "} "
scriptString += "</script>"
'-- Register script block on page
If (Not IsClientScriptBlockRegistered("clientScript")) Then
RegisterClientScriptBlock("clientScript", scriptString)
End If
Me.btnRoleRemove.Attributes.Add("onClick",
"RemoveRole();return false;")
Me.btnRoleAdd.Attributes.Add("onClick", "AddRole(); return
false;")
> -----Original Message-----
> From: Matthew Small [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, September 26, 2002 2:12 PM
> To: dotnet
> Subject: RE: Adding javascript onlcikc event to a button
> which already has one
>
>
> Hi,
> I've been trying this and variations of this with no
> success. Anybody else got any ideas?
>
> Thanks for your help
>
> Matthew Small
> IT Supervisor
> Showstopper National Dance Competitions
> 3660 Old Kings Hwy
> Murrells Inlet, SC 29576
> 843-357-1847
> http://www.showstopperonline.com
>
>
> -----Original Message-----
> From: Alex Dresko [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, September 26, 2002 2:03 PM
> To: dotnet
> Subject: RE: Adding javascript onlcikc event to a button
> which already has one
>
> Try something like this in your code..
>
> myButton.Attributes["OnClick"} += "AnotherJavascriptFunction();";
>
> Depending on what the existing OnClick code looks like, you
> might have to do this in order to add another Javascript
> function to the command.
>
> myButton.Attributes["OnClick"} += ";AnotherJavascriptFunction();";
>
> Alex Dresko
> Three Point Oh!
>
>
>
> -----Original Message-----
> From: Matthew Small [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, September 26, 2002 1:16 PM
> To: dotnet
> Subject: Adding javascript onlcikc event to a button which
> already has one
>
>
> Hi -
> I'm using ASP.NET(VB) webforms. I want to add a small
> javascript line that causes my button to change its value
> when clicked upon - from "Submit Purchase" to "Please Wait"
> so the form does not get clicked more than once when the user
> is waiting for a response.
> I've tried adding an attribute to the button in
> question, and it does get there. The problem is that the
> button already has an onclick event line that overrides the
> one that I want to use. I've thought about using
> onformsubmit, but I have the same problem there. Anybody got
> any ideas?
>
> Thanks
>
> Matthew Small
> IT Supervisor
> Showstopper National Dance Competitions
> 3660 Old Kings Hwy
> Murrells Inlet, SC 29576
> 843-357-1847
> http://www.showstopperonline.com
>
>
>
>
>
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