VISITview Access to Remote Image Files

updated: 04/22/2004
This capability will allow you to define a "page" of your lesson that instead of being a pre-loaded or defined filename, it is a URL which points to an image somewhere "out there". This image is then loaded when you select the page during the normal course of events.

Note: This capability will only work in non-browser (that is, pre-loaded) mode because of Java security.

Here are the details:

  1. Pages defined with URL-based image filenames (defined as any "filename" that starts with "http://") will be loaded over the web during the lesson/collaboration, and whenever the lesson is loaded in the Lesson Builder.
  2. A page defined with a URL-based image can be used:
  3. If a page is defined using a URL-based image, no other images should be put onto that page; there is no protection against this in the Lesson Builder yet, however.
  4. If you want more than one frame for the page, you must either use the wildcard (*) form of the URL. e.g.,*
    defines a series of filenames like "ev_mar29_0", "ev_mar29_1", etc., (note - the first number must always be zero)... can use embedded string substitution to imply more than one image. e.g.,[00;01;32;56;02].jpg
    which specifies 5 frames (ev_map29_00.jpg, ev_mar29_01.jpg, ev_mar29_32.jpg, etc.). This form is also useful if your image names are in a sequence that does not begin with zero.
  5. The URL format has some restrictions:
  6. You may move a URL-based page around, as usual. You cannot remove frames, etc., from the page. In otherwords, once you import a URL-based page, you're stuck with its characteristics. You can, of course, delete it and re-import something different if you like.
  7. In the Lesson Builder, a new Menu Item, "Image from URL" will be added. When you click on this, a modal dialog will appear. There will be two text fields for you to type into: You should type in the appropriate info, and then click "Close" button (there is also a "Cancel" button).

    After that, the first image will be browsed into the usual thumbnail view, and the "Append" and "Insert" buttons will be enabled. Note that when you click either of these, the total number of frames you specified will be inserted into the lesson on a _single page_ (see Item #2 above).

    If the thumbnail does not appear, there is an access problem (like an invalid URL or filename). Bring the dialog up again and correct the problem.

    The thumbnails will exist only during the Lesson Builder session; when you Save the lesson, only the URLs are written into the lesson file -- no images will be saved for those pages. When you re-start the Lesson Builders, any pages defined with URLs will be reloaded from the web.

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