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Is AutoPostBack set to true on the control ?
Try not! Do or do not, there is no try. - Master Yoda
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First of all, it's "javascript:return myconfirm();" (notice the colon), but you shouldn't use the "javascript" declaration. This scheme is only necessary when you use it in an attribute that accepts a URL, such as the A.href attribute.
If you change the the handler for the onchange event of your element, auto-post back won't occur since events only work with a single handler. You can, however, call __doPostBack (with the necessary params) in your myconfirm function. The work-around for this problem is just what I mentioned: since you can only have a single handler for an event, have that handler call other functions. Of course, you should call __doPostBack last since it will create a new request (thus resulting in round trip to the server).
Microsoft MVP, Visual C#
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Heath,
i try to work it out follow your way. here is the code i wrote:
in test.aspx.cs
private void Page_Load(object sender, System.EventArgs e)
{
// b1 is a invisible button will save change to database
string sCmd = Page.GetPostBackClientHyperlink(b1,"");
string script1 = "javacript: return myconfirm(" + sCmd + ")";
if (!Page.IsPostBack)
{
DropDownList1.Attributes.Add("onchange",script1);
}
}
in test.aspx
function myconfirm(cmd)
{
var agree = confirm("sure?");
if (agree)
eval(cmd);
}
but the browser always said the javascript code had errors. is there any error in string script1.
thanks.
david
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As I mentioned before, don't include "javascript:" before your script. You only do this in URL attributes, like <a href="javascript:doSomething();">Do something</a>. In event attributes, you don't include this because they only work with script.
Microsoft MVP, Visual C#
My Articles
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Hi Heath,
yes, i got the result i want finally. thank you.
and i have a similar question: how are radiobuttonlist? i can not use the same way to raise a popup dialog.(e.g. radiobuttonlist1.attributes.add( ... ))
david
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Look at the rendered output when the AutoPostBack is set to true. There should be an attribute there that you could "override" in such a way.
Another way in both cases is to let ASP.NET do it's job and post back to the server, then use RegisterStartupSCript to include inline javascript toward the end of the page (before the single server-side form's closing tag) that pops up a window. When you start overriding event attributes, you take a big risk at breaking the ASP.NET pipeline (which is why - as I mentioned before - you must make sure you call __doPostBack with the right params in your javascript function).
Microsoft MVP, Visual C#
My Articles
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Hi guyz,
Does any of you know how to pop up a save file dialog box for a web application? For example, if we want to save files (image, windows media files,mp3s) from the web to the user-end pc.
Thanks in advance guyz.
Rico
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I believe the dialog you mention is part of your browser functionality. For example, IE or whatever browser you use will prompt you for download, show progress of files that are to be downloaded, or even launch the file with appropriate application.
All you do is create the hyperlink for the downloaded content (i.e. zip, wmv, etc.)
Example:
<a href="/relativepath/somefile.mpg>A cool tune</a>
The browser will handle the file according to the settings. For example, it may launch a hyperlinked .mpg file with Media Player or some other player that is registered with your operating system.
<br>
<hr noshade width="100%" color=#80BFFF>
<p style="background: #C0CBEE;border:2px solid #80BFFF;margin:0px;padding:2px;font-size:8pt;text-align:left;width:457"><a style='color:white' href='/script/profile/whos_who.asp?id=26227'>R.Bischoff</a>
.NET, Kommst du mit?
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That is one way to do it.. thanks for reminding me =)
but the thing is, my web application enables the user to create a file, which I'd rather specify the target location of the file first, before it's created.. so implementing a save file dialog will be just what I'm looking for...
but your idea is quite good as well... =) .. If you know how to implement a save file dialog.. that'll be a bunch of help for me.. =)
Thanks
Rico
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You can't create a file on the user's machine from a web site, so just download the content to the browser, which will create the file after downloading it (or some browsers will create the file in the spot the user specified immediately). I mean, if a web site had the power to just create files on a user's machine, think of how big a security hole that would be! 
What the previous post said is the only way to do it unless you want to implement some complex Java applet, ActiveX control, or .NET UserControl (not as easy as you might think because of code access security). But why? It would be a complete waste of time.
If you need to create the file on the fly, so do it. This is common. Do you think a web server just redirects a request for a file? No, it reads the file into a buffer and streams it to the client, which reads the stream as it can.
So, just start writing to the response stream and forget about the client. Their browser will prompt for a location (they may cancel) and start writing what you're buffering on the server to the location the user specified. You (writing the server code) don't have to worry about a thing. This is how web servers (not to mention most daemons) work.
Microsoft MVP, Visual C#
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Does anyone know of a control, activex component or otherwise which allows one to edit AVI files and their embeded sound?
I have a time sensitive project of which that will be a part. I need to be able to embed the interface into my own but would rather do as little work as possible on the actual editor (due to the time constraints).
I would also rather buy a fully supported component than a free one-off project (uless its REALLY robust)
--Tony Archer
"I can build it good, fast and cheap. Pick any two."
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Since you didn't specify what kind of editing you need and you didn't even bother to go to google for this:
http://www.softcities.com/VideoEdit-ActiveX-Control/download/6926.htm
which is USD77
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Ok, sorry, let me specify.
I need to be able to cut/paste sections of an avi file (including sound).
Select sections of it and play just those (to preview it) etc.
Imagine most wave editors, but add the video element to it as well.
Small request, isn't it? 
--Tony Archer
"I can build it good, fast and cheap. Pick any two."
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well for something small microsoft made a tool that you can cut/paste
AVIEDIT.EXE i think is on one version on vc++ or better yet check the web for free avi editor or on sourceforge.net
anyway you probably need some better to do what you asked!
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visit www.NCTSoft.com . I think there is what u need.
NCTVisualStudio is really good set of activeX libraries.
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Thank you. I'd looked at their audio editing component (which does exactly what I want, by the way) but hadn't taken a hard look at their video studio component. Your post convinced me to look at it closer and it will do what I need.
THANK YOU!
For anyone else this company makes many multimedia components as ActiveX DLLs They also have a few .NET components.
http://www.nctsoft.com/
NCTVideoStudio - video editing
NCTAudioStudio - audio editning
NCTAudioEditor - a drop down audio editing control (very nice)
NCTImageStudio - image editing (haven't checked it out)
NCTPhotoStudio.NET - ?? image processing (haven't checked it out)
NCTSWFProducer.NET - Make macromedia flash files. (haven't checked it out)
NCTFinancialChart.NET -??
NCTDiscWriter - burn dvd's / cds from what I can tell (haven't checked it out)
NCTDialogicVoice - ?? looks like some text to speach thing, but I'm not sure
--Tony Archer
"I can build it good, fast and cheap. Pick any two."
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look at vdub on sourceforge, its not a component, but it does exactly what u want it to, why have a component?
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VirtualDub is a stand alone application and therefore does not meet my needs. My whole purpose is to take a convoluted process with external programs being used and tie them into one easy interface.
After spending all night working on it, the components from NCTSoft do not synch up nicely. Their audio editing component is nice. and their video components do what they were intended for, but it is nigh-on impossible to get them to synch without a slight delay between the two.
Anyone know of another video editing component? I have 20 days to build this project (rediculous, yes?) And therefore would MUCH rather not have to build something from scratch.
--Tony Archer
"I can build it good, fast and cheap. Pick any two."
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How can i know if an control has added an event.
Example:
Boton.Click+=new ..........<br /> How can I ask to control if it has added that event?
Thank you!
La realidad no es más que impulsos eléctricos del cerebro - Morpheus
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You can either declare your own add and remove accessors for your event (like the get and set accessors for properties), or use a collection or dictionary with events for when objects have been added or removed. If you want to do something like this for a control's events, you should override them like so:
public event Click
{
add
{
if (value.Target is IMyInterface)
base.Click += value;
}
remove { base.Click -= value; }
}This would allow you to selectively allow event handlers to be added to an event. If you wanted, you could create an event on this subclass that you would fire from these accessors when a delegate (event handler) is added or removed.
If you're just looking for a way to determine if an event handler is added to or removed from and event without going through these steps, I really don't see how that's possible without using some sort of profiler, which is definitely not an easy task.
Although, that does bring up another way, though this really would work for controls. You could use a context-bound object and intercept the event add and remove calls using aspect-oriented programming techniques.
Microsoft MVP, Visual C#
My Articles
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Hi,
I would like to send some data to some page on the web, that will then process that data.
I would liek to send for instance.
How do I do that?
I checked MSDN but didn't find anything.
Thanx in advance.
Q:What does the derived class in C# tell to it's parent?
A:All your base are belong to us!
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Look at the documentation for the HttpWebRequest.GetRequestStream method in the .NET Framework SDK. It has a complete example. We have also covered this many times in the forum, so you could always search (although the responses are either the same or similar to what's in the .NET Framework SDK (which, btw, is installed locally with VS.NET by default and you should use that since it'll be much faster to use and right at your finger tips).
Microsoft MVP, Visual C#
My Articles
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I dont use VS.NET.
I checked MSDN but didn't find anything as I said.
I have now searched for HttpWebRequest.GetRequestStream, and now it works.
Thanx
Q:What does the derived class in C# tell to it's parent?
A:All your base are belong to us!
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Code-Behind is c#, and this is for webform.
Assuming you have 2 dropdown list.
Here's a sample code to illustrate.
<asp:dropdownlist id="ddl1" runat="server" OnSelectedIndexChanged="ChangeBehavourddl1" autopostback="true">
<asp:dropdownlist id="ddl2" runat="server" OnSelectedIndexChanged="ChangeBehavourddl2" autopostback="true">
Values from ddl2 will be dependable on ddl1.
In otherwords, when you change the selection on ddl1, ddl2 will change it's results.
Here's my question.
Before writing this code in .Net, I used to have a JavaScript Code that actually disable the dropdown form. But how would you do it in ASP.Net ?
I know the grey out syntax. In this particular case it's:-
ddl1.enabled = "false"
And I can't put this in the OnSelectedIndexChanged method call. Since it's server side control. I need something that is called instantaneously on the front-end.
This is a problem to me because, some query (on ddl1) takes longer than anticipated and i don't want user to select ddl2, before the results for ddl1 is done querying.
Stanley
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