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Published: Wednesday, October 25, 2000

A Picture Gallery using the Content Linking Component, Part 2

By Evagoras Charalambous

  • Read Part 1

  • In Part 1 we looked at the first of six files in our Picture Gallery application - common.asp. In this part we'll continue our examination of the other ASP files that make up the Picture Gallery!

    - continued -

    Our starting page, when visited through a browser, lists the various folders of pictures (or each gallery), the total file size for each folder, the number of pictures in the folder, a link to an Administration page, and an option to view a slide show. A screenshot of default.asp can be seen below:

    default.asp, when viewed through a browser.

    The code goes through the myFolder you specified in common.asp (pictures in this case) and looks for folders. For every folder it finds it checks to see if it contains a text Content Linking file with the name we specified in myTextFile (i.e. ContLink.txt). If there is none, it loops through all the contents of the folder, creates a string with the names of the files, and then uses the FileSystemObject to write it in its folder. At this moment the "Description" is just the name of the file without the extension. After that, or if the text file is already there, it creates the table as shown above. Using the pulldown menu for each folder you can choose a time to automatically loop through that folder. You may choose to remove the link to the administration page from this page if others will have access here.

    By clicking on the folder name school in the default.asp page you get the screen below:

    list.asp screenshot

    This page simply lists all the "Titles" of the pictures in the specific folder, which is harvested from the "Description" of the picture in its text file. From here you can click on a specific picture to view it.

    This file displays the pictures. Format the page to how you see fit. I added some code on top to show you where you are in relation to the total pictures in the folder, and links to the Next/Previous pictures.

    Picture of a chair. Picture of a couch.

    Since we may have a slew of pictures in a given folder (gallery), we must know what picture we are currently viewing out of the list of total pictures. This position is specified and maintained by a variable named Index that we pass through the QueryString.

    If we get to this page by selecting the "slide show" from the default.asp page then it will refresh after the number of seconds we specified, fetching the next picture in our gallery. After the last picture it goes back to our list of pictures for that folder.

    admin.asp + do_admin.asp
    The administration page allows us to delete and edit pictures. We can easily add a Title and Description to our pictures. The pictures are the same ones as the larger ones, just at a smaller scale, so if you have a lot of them in the folder it could take a while to load. I like to see them here because sometimes I choose to erase some of them. To delete a picture from the folder and from its Content Linking file, click on the corresponding "Delete" checkbox next to the picture. Once you are done with your changes, click the submit button. The changes are carried over to the do_admin.asp page, which does all the processing. Below is a screenshot of the administration page:

    Edit or delete pictures from the administration page.

    Last Thoughts
    And now that you have your gallery ready and functioning, you can use it to post your summer vacation pictures on your personal site, or for a much bigger project. This method works relatively easy and is not very hard on the server. There is one drawback though that's pretty obvious. If you want to preserve your Titles and Descriptions when you are adding new pictures you will have to edit the text file directly. One could possibly work on that and add the functionality to this code. My code only checks for the existence of a text linking file, and if one is already there it accepts it. If you add/delete many pictures to your folders you might want to erase the text file from that folder and reload the default.asp page to create a new text file. You would then loose your Titles and Descriptions if you have any. One could possibly work on this and add further functionality to my code that would check the text linking files against the folder contents and do the necessary updates.

    If you have any suggestions for improving this code or questions on it, feel free to contact me. I can be reached at my website at http://www.evagoras.com/ or at my email evagoras@evagoras.com.

    Happy Programming!


  • Download the pictures and source code in ZIP format
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