Feedback: irt.org FAQ Knowledge Base Q1657

Feedback on:
irt.org FAQ Knowledge Base Q1657

Worth:
Worth reading

Comments:
The idea presented is OK, but suffers from the problem that sooner or later your webcam will be updating the imagefile at the same moment your javascript reads it, resulting in a broken image. (zero byte file or no file)

Question: is there ANY way of verifying if a loaded image is broken or not? (and if broken not display it)

My testing indicates that neither of the methods: document.images, image.onLoad or image.onError will work for this . Nor will image.height or image.width help.

Seems that Javascript is not up to the job.

Any ideas ?

Worth:
Worth reading

Length:
Just right

Technical:
Just right

Comments:
One technical limitation of this script to note: Notice the Math.random() usage at the end of the image. This is used so user's browsers will not used cached versions of images by appending a string of characters to an image's HTTP request. Servers will usually ignore this.

However, this method will probably not work if you are grabbing an image from a program, such as a CGI script, that is dependant on command lines (or 'query strings'). CGI scripts are commonly used to pull random images from a database, as is the case in many webcam directories.

Keep this in mind before intergrating this script. :)

Worth:
Very worth reading

Comments:
took me forever to find a script that really worked, but this one finally hit it... much thanks