CS 101   Web Construction,  Fall 2017,  Instructor:  Jeffrey Horn

• Assignment 6:  "Javascript for Captcha!"

  • Handed out:  Tuesday, Oct. 31, 2017
  • Due:  (TBA)
  • Goals:
    1. Javascript programming (random numbers -> random behavior)
    2. Learn to use html forms for user interaction
    3. Use of the conditional statement ("if-then-else")
  • Background:
    • Wikipedia entry for Captcha
    • Images used in class.
      
    • Sample Code from class
  • Details:
    • Get multiple Captcha images, minimum five (5), making sure they are all different.
    • Use a random number to choose which image to show the user when the page is viewed. 
    • If the user submits the matching character string, then give them a link to your A4 or A5 web page.
      
    • otherwise, let them try again, BUT WITH A NEW CAPTCHA IMAGE randomly chosen from the five (or more)!
    • Keep track of the number of unsuccessful attempts, and display this number on the web page.
      
  • Grading:  Total 100 pt.s.   The usual grading scale (i.e., 90 to 100 pt.s is an A, 80 to 89 pt.s is a B, etc.)
  • Turn-in Procedure:  Put your web pages on the web (use your myweb.nmu.edu web site or your own web server account if you have one).  Email me the URL for this assignment:  (jhorn@nmu.edu).  Keep it "secret"!  Use an obscure URL.