ASP.NET

Re: ASP.net Ajax Server Control

8-Jul-09 4:04

Hi all,

I have a composite ASP.NET server control includes a HTML button that shows a div which allows searching capacities, the Search capacities are implimented using AJAX, im inheriting from WebControl and impliementing INamingContainer and ICallbackEventHandler.

The Control that works fine if you have just one control on the an ASP.NET page.

If you add further controls onto the page the first control still works fully but all contols after that allow the show/hide behaviour but the Ajax bits dont work. There are no errors, the data area just stays blank.

I think i have a problem with the way im registering the callback function. this is the code im using which is in the overridded OnPreRender Method of the Server Control.

string sref = Page.ClientScript.GetCallbackEventReference(this, "arg", "display","", true);

string Callback = "function GetData(arg, context){" + sref + ";}";

Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "CallBack", Callback, true);

This outputs the following section of html

<script type="text/javascript">
//<![CDATA[
function GetData(arg, context){WebForm_DoCallback('LookupBox23123',arg,display,"",null,true);}//]]>
</script>

As you can see the first parameter of the callback contains the ID of the first control added (I know the ID is abit weird). I Think that is why the first control continues to work with Ajax but the rest don't.

Is there a way i can pass in the control name to the callback method so i can use multiple controls, or can i amend the script Reference to allow this functionality.

Many thanks Phil

PJWindsor8-Jul-09 5:59

Need to capture data of currently displayed webpage

8-Jul-09 5:59

Please ignore this now i've worked it out, although if anyone has a better way let me know.

I've used the context to pass the control name through.

string sref = Page.ClientScript.GetCallbackEventReference("context", "arg", "display","context","display_Error", true);

            string Callback = "function GetData(arg, context){" + sref + ";}";

            Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "CallBack", Callback, true);

this means that in my javascript i've got calls like

GetData(Value,"Lookup1");

Cheers Phil

Antone Eason8-Jul-09 3:41

8-Jul-09 3:41

Greetings,

I would like to know if anyone has any code ASP.NET or even VB script, Perl etc that can simply be run from a command line to download whatever page is on a browser and write the raw HTML to a file, it can also be MHT for that matter.

I know about using - Navigate etc for a specific web page. This is different. The page I go to require authentication with word art and user name and password etc. Then once there you must click a few times to get where you are going for the data. Therefore running a script to direct me to a certain webpage will not work. The page has to be displayed first and then downloaded.

So, I just want to take whatever is currently on the browser, mainly due to catch refreshes of new data. Understand the page I am getting data from is generated as from a database so I can not simply run a script file to download that page. The program must be able to simple be activated and write to disk what ever is displayed on the browser at the time the program is run.

I have a seperate data extractor to run against the new file to find the data I need. This file can always have the same name as well and be overwritten.

Thanks,

Antone

Ignore repost [modified]

Manas Bhardwaj8-Jul-09 4:02

Manas Bhardwaj

8-Jul-09 4:02

This is considered as rude.
You already asked this question in C# forum.

Manas Bhardwaj
Please remember to rate helpful or unhelpful answers, it lets us and people reading the forums know if our answers are any good.

modified on Wednesday, July 8, 2009 10:08 AM

Antone Eason8-Jul-09 4:07

8-Jul-09 4:07

Not clear why it is rude??? I am asking different forums and those that do not necessary see my question from other forums. So, if my question maybe answered in Perl and not in C# then the Perl guys will never see my question.

If this is not correct let me know. I have not been on here in many years.

Thanks,

Antone

N a v a n e e t h8-Jul-09 4:45

N a v a n e e t h

8-Jul-09 4:45

Antone Eason wrote:
Not clear why it is rude??? I am asking different forums and those that do not necessary see my question from other forums

Well, in such cases, you can post the question in most appropriate forum and link to it while posting in the other forums. Putting the same text in all places is considered to be rude.

To answer your question,

You have said the page you want to download requires authentication and some word art. Do you mean a CAPTCHA[^] ? If yes, getting the authentication pass is tough as you can't predict the value of CAPTCHA.

Smile | :)

Navaneeth

How to use google | Ask smart questions

Antone Eason8-Jul-09 4:52

8-Jul-09 4:52

OK thanks I will look into linking for future posts. As far as my question I do not need to authenticate or worry about login credentials. I am already in fine, the page just changes every few minutes.

Think of it as simply being able to click the [view source] button on any web page that happens to be on the browser and then the source e.g. raw HTML is written to a text file.

That is what I need a script or program to be the view source button that I can invoke inside a batch file that is called by the scheduler every 5 minutes or so to check for the latest update.

Thanks,

Antone

N a v a n e e t h8-Jul-09 17:21

N a v a n e e t h

8-Jul-09 17:21

Look at the WebClient class and work with DownloadString[^] method. It does exactly what you are looking for. Try to follow the below steps

1 - Create a console application which quits automatically once the job is done.
2 - Inside this, use WebClient class and request to the web page. This will give you raw HTML.
3 - Schedule this exe to run every 5 minutes for getting the latest updates.

Hope that helps Smile | :)

Navaneeth

How to use google | Ask smart questions

Antone Eason8-Jul-09 18:46

8-Jul-09 18:46

Hi - yes that sounds like an excellent solution. I will try just a little short on time.

Thanks again!

Antone

Antone Eason8-Jul-09 9:44

Re: Need to capture data of currently displayed webpage

8-Jul-09 9:44

Hi - Yes that is security used. Thanks for your input and quick response.

Thanks,

Antone

PJWindsor8-Jul-09 4:17

Re: Need to capture data of currently displayed webpage

8-Jul-09 4:17

Hi, have you tried Fiddler its a HTTP Debugging tool and logs whats going on as your are browsing, you can see html, js files downloaded and alot more, might help.

If that doesnt do the trick then look at the WebRequest object this can be used to get the HTTP response, as you said there is a log screen it maybe harder, but you can do your own POST by changing the username, password, and wordart answer into a Byte array and then sending this with your request to whatever page the form points too.

try here http://msdn.microsoft.com/en-us/library/system.net.webrequest.aspx[^]

Phil

Antone Eason8-Jul-09 4:27

Re: Need to capture data of currently displayed webpage

8-Jul-09 4:27

Hi Phil,

Thanks for the quick reply! I will take a look at fiddler. I am an assembly language programmer mainly, so I do not know so much about script languages. If fiddler can write the webpage to a file then it should work!

Please understand the login is not an issue anymore I can login fine and leave the opera browser on with refresh set to 30 seconds. Then as the page refreshes with new data I want to write it to a file. Next my program runs and check the raw data to see if what I am looking for is there, if it is then the bell will ring, if not then it ends and waits for the next html file to check.

Thanks,

Antone

Antone Eason8-Jul-09 4:32

Re: Need to capture data of currently displayed webpage

8-Jul-09 4:32

Hi Phil,

Sorry Fiddler is a no go. It does not write data to a file.

Thanks,

Antone

PJWindsor8-Jul-09 5:03

Re: Need to capture data of currently displayed webpage

8-Jul-09 5:03

How about if you use the WebBrowser Control on a windows form? Im not sure but it think you should beable to browse to the page you want and then write some code to get the HTML of the current page on the WebBrowser control.

If that doesnt work then you can look at using Automating IE directly i forget the dll name its something like SHDocVW and this contains the Interfaces for automating IE Directly.

From here you can get the current document.

Antone Eason8-Jul-09 5:10

Re: Need to capture data of currently displayed webpage

8-Jul-09 5:10

Thanks for the input, but I do not believe I have the knowledge to do that. I was hoping that this has been done before. The IE automation sounds interesting.

Thanks,

Antone

PJWindsor8-Jul-09 5:20

Re: Need to capture data of currently displayed webpage

8-Jul-09 5:20

If you want it learn its Called Platform Invoke in .NET its all about using the existing Windows dll's from .NET

here is a good artical to get started its shows you how to use some of the functions in the User32.dll

[PInoke on CodeProject]

this website list alot of the windows functions with code to automate them

http://www.pinvoke.net/[www.pinvoke.net]

Phil

Antone Eason8-Jul-09 9:39

Re: Need to capture data of currently displayed webpage

8-Jul-09 9:39

Hi Phil,

Thanks for all your assistnce. I really though this would have been done in the past. I will take a look at all the info you sent to me.

Still waiting to hear back from the Perl guys, I really thought you can do this in Perl.

Thanks,

Antone

PJWindsor8-Jul-09 5:47