Programming Forums > Web Development and Design > ASP.NET

King · Mar 25th, 2008, 10:15 PM

I am doing a website in ASP.Net and I need to implement a slide show and I have a few questions.

I was able to implement one in JavaScript fairly easily, but I need to be able to load all the images from a folder without knowing how many images there will be and I do not think that is possible with JavaScript. If there is a way to be able to read/display all the images from a folder (without knowing all the files names) with JavaScript please let me know

.

If the JavaScript way is not possible I will do it server-side. If I do it server-side is there a way to have it automatically switch the picture after X amount of time without an AJAX timer or anything fancy like that?

I may just end up using the AJAX slide show control. It is a fairly simple website and did not want to use too much server-side code or AJAX stuff. Thanks for any input on this.

Ghost · Mar 26th, 2008, 6:01 AM

Please post java-script

Ooble · Mar 26th, 2008, 6:32 AM

I would use ASP.NET to tell the JavaScript what the file names are. Not sure about ASP, but this is how I'd do it in PHP:

 php Syntax (Toggle Plain Text) 
<?php
$imageDir = 'images/';
$imagePaths = scandir($imageDir);
echo 'var imagePaths = Array ("' . implode('", "', $imagePaths) . '")';
?>
<?php
$imageDir = 'images/';
$imagePaths = scandir($imageDir);
echo 'var imagePaths = Array ("' . implode('", "', $imagePaths) . '")';
?>

Ghost · Mar 26th, 2008, 3:31 PM

Here are a few places to check out.

http://www.asp.net/AJAX/AjaxControlT...SlideShow.aspx

http://aspnet.4guysfromrolla.com/articles/070704-1.aspx

http://www.codeproject.com/KB/ajax/ASPNETSlideShow.aspx

grimpirate · Mar 26th, 2008, 5:21 PM

Don't know if this will be of use to you, as I just happened over it and didn't really inspect it too closely:
http://www.wikicodia.com/wiki/JavaSc...ory_files_list
http://www.codeproject.com/KB/script..._in_files.aspx

grimpirate · Mar 26th, 2008, 5:51 PM

Alright I tested the following code on my local Apache server:

(Toggle Plain Text)

<script type="text/javascript">
function httpGetText(aURL) {
  var req = new XMLHttpRequest();
  req.open('GET', aURL, false); 
  req.send(null);
  return req.responseText;
}
document.write(httpGetText('http://localhost/somedir/'));
</script>

I created a temporary directory called 'somedir' and it worked. However, if I added an index.htm file into the directory it just returned that file rather than the list of files. Basically, that means that directory scans can only be performed on server's whose default behavior is to return the list of files within that directory; provided of course there isn't an index page or that it doesn't return a 404 or other such error code.

King · Apr 2nd, 2008, 3:35 PM

Thanks for the info guys. I have chosen to use the Ajax Slide Show control.

I have one more question. In ASP, what is the best way to get a list of files from a directory? This is how I am doing it currently:

(Toggle Plain Text)

string directory = "c:/Inetpub/wwwroot/MyWebsite/test_images/";
DirectoryInfo di = new DirectoryInfo(directory);
foreach (FileInfo oFile in di.GetFiles())
{
	string fileName = oFile.Namel
	// ...
}

The problem with this is that it is relying on the filesystem and I do not know how the hosting provider will have their server setup. Is there a way where I can search the IIS virtual directory and just pass in "~/test_images" as the directory string?

kruptof · Apr 2nd, 2008, 5:03 PM

Try getting the current working directory and go from there, not sure of exact syntax but I think it goes something like this:

(Toggle Plain Text)

Directory.GetCurrentDirectory()

Jimbo · Apr 2nd, 2008, 8:39 PM

You can probably use Server.MapPath("~/Some/Path")

King · Apr 7th, 2008, 7:27 AM

kruptof / Jimbo... both of those worked

Server.MapPath("~/Some/Path") did it in one less step though. Thanks guys. I now have the slide show running as desired.

Mar 25th, 2008, 10:15 PM	#1
King Professional Programmer Join Date: Jan 2006 Location: Ontario, Canada Posts: 354 Rep Power: 3	Slide Show I am doing a website in ASP.Net and I need to implement a slide show and I have a few questions. I was able to implement one in JavaScript fairly easily, but I need to be able to load all the images from a folder without knowing how many images there will be and I do not think that is possible with JavaScript. If there is a way to be able to read/display all the images from a folder (without knowing all the files names) with JavaScript please let me know . If the JavaScript way is not possible I will do it server-side. If I do it server-side is there a way to have it automatically switch the picture after X amount of time without an AJAX timer or anything fancy like that? I may just end up using the AJAX slide show control. It is a fairly simple website and did not want to use too much server-side code or AJAX stuff. Thanks for any input on this. __________________ I am Addicted to Linux!

Mar 26th, 2008, 6:01 AM	#2
Ghost Man Bear Pig Hunter Join Date: Jul 2005 Location: NorCal, USA Posts: 288 Rep Power: 3	Re: Slide Show Please post java-script __________________ People who click "images" that end with .exe shouldn't have computers.

Mar 26th, 2008, 6:32 AM	#3
Ooble I eat cake for breakfast. Join Date: Jul 2004 Location: In my box. Posts: 4,435 Rep Power: 8	Re: Slide Show I would use ASP.NET to tell the JavaScript what the file names are. Not sure about ASP, but this is how I'd do it in PHP: php Syntax (Toggle Plain Text) <?php $imageDir = 'images/'; $imagePaths = scandir($imageDir); echo 'var imagePaths = Array ("' . implode('", "', $imagePaths) . '")'; ?> <?php $imageDir = 'images/'; $imagePaths = scandir($imageDir); echo 'var imagePaths = Array ("' . implode('", "', $imagePaths) . '")'; ?> __________________ Me :: You :: Them

Mar 26th, 2008, 3:31 PM	#4
Ghost Man Bear Pig Hunter Join Date: Jul 2005 Location: NorCal, USA Posts: 288 Rep Power: 3	Re: Slide Show Here are a few places to check out. http://www.asp.net/AJAX/AjaxControlT...SlideShow.aspx http://aspnet.4guysfromrolla.com/articles/070704-1.aspx http://www.codeproject.com/KB/ajax/ASPNETSlideShow.aspx __________________ People who click "images" that end with .exe shouldn't have computers.

Mar 26th, 2008, 5:21 PM	#5
grimpirate King of Portal Join Date: Sep 2005 Posts: 365 Rep Power: 3	Re: Slide Show Don't know if this will be of use to you, as I just happened over it and didn't really inspect it too closely: http://www.wikicodia.com/wiki/JavaSc...ory_files_list http://www.codeproject.com/KB/script..._in_files.aspx __________________ You are here to serve the board. So post well... and live. SPAMMING SPEED! GrimBB

Mar 26th, 2008, 5:51 PM	#6
grimpirate King of Portal Join Date: Sep 2005 Posts: 365 Rep Power: 3	Re: Slide Show Alright I tested the following code on my local Apache server: (Toggle Plain Text) <script type="text/javascript"> function httpGetText(aURL) { var req = new XMLHttpRequest(); req.open('GET', aURL, false); req.send(null); return req.responseText; } document.write(httpGetText('http://localhost/somedir/')); </script> <script type="text/javascript"> function httpGetText(aURL) { var req = new XMLHttpRequest(); req.open('GET', aURL, false); req.send(null); return req.responseText; } document.write(httpGetText('http://localhost/somedir/')); </script> I created a temporary directory called 'somedir' and it worked. However, if I added an index.htm file into the directory it just returned that file rather than the list of files. Basically, that means that directory scans can only be performed on server's whose default behavior is to return the list of files within that directory; provided of course there isn't an index page or that it doesn't return a 404 or other such error code. __________________ You are here to serve the board. So post well... and live. SPAMMING SPEED! GrimBB

Apr 2nd, 2008, 3:35 PM	#7
King Professional Programmer Join Date: Jan 2006 Location: Ontario, Canada Posts: 354 Rep Power: 3	Re: Slide Show Thanks for the info guys. I have chosen to use the Ajax Slide Show control. I have one more question. In ASP, what is the best way to get a list of files from a directory? This is how I am doing it currently: (Toggle Plain Text) string directory = "c:/Inetpub/wwwroot/MyWebsite/test_images/"; DirectoryInfo di = new DirectoryInfo(directory); foreach (FileInfo oFile in di.GetFiles()) { string fileName = oFile.Namel // ... } string directory = "c:/Inetpub/wwwroot/MyWebsite/test_images/"; DirectoryInfo di = new DirectoryInfo(directory); foreach (FileInfo oFile in di.GetFiles()) { string fileName = oFile.Namel // ... } The problem with this is that it is relying on the filesystem and I do not know how the hosting provider will have their server setup. Is there a way where I can search the IIS virtual directory and just pass in "~/test_images" as the directory string? __________________ I am Addicted to Linux!

Apr 2nd, 2008, 8:39 PM	#9
Jimbo Expert Programmer Join Date: Feb 2006 Location: Bellevue, WA, USA Posts: 705 Rep Power: 3	Re: Slide Show You can probably use `Server.MapPath("~/Some/Path")` __________________ <insert disclaimer here> <insert shameless plug for Visual Studio here>

Apr 7th, 2008, 7:27 AM	#10
King Professional Programmer Join Date: Jan 2006 Location: Ontario, Canada Posts: 354 Rep Power: 3	Re: Slide Show kruptof / Jimbo... both of those worked Server.MapPath("~/Some/Path") did it in one less step though. Thanks guys. I now have the slide show running as desired. __________________ I am Addicted to Linux!

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