EE296 Webbased Truth Table Program

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EE296 Web-based Truth Table Program

• Jason Axelson
• Bryant Komo

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Brief Overview

• We are doing a web based version of truth_table
  which was used in EE260 to create truth tables
  and create hex files for the eprom.
• Our project will be written mostly in JavaScript,
  which is an interpreted scripting language for
  the web
• We will also use cgi which is a script (we're
  going to use C, but many other languages are
  possible) that runs on the server.
• Our program will be better than truth_table.

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Overall Block Diagram
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The Interface The Website
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Assembling the HTML

• For each row
• Add HTML for row label
• Add HTML for input cells
• Add HTML for the border cell
• Add HTML for output cells
• Write HTML to inside of a div tag

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Manipulating Rows

• If row is beyond table, add line at end of table
• save table to temp
• add row to bottom
• redraw table with new height
• open part of table that is above the row being
  added
• open bottom half of table shifted down one

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Events

• Uses onkeydown to capture key press.
• Uses onkeypress to capture key press.
• needs to use onkeypress for netscape, some old
  versions of firefox, and opera, and onkeydown for
  most other browsers.
• Uses onclick to capture mouse clicks.
• //Some browsers need to use onkeydown, some need
  to use onkeypress
• if(isKeyDown)
• table_html "onkeydown'return
  checkForKey(event, this)' "
• else if(isKeyPress)
• table_html "onkeypress'return
  checkForKey(event, this)' "

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Browser Detection

• var browser navigator.userAgent
• if(browser.indexOf("Firefox/1.0.2") ! -1)
• isFirefox1_0_2 true
• isKeyPress true
• else if(browser.indexOf("MSIE") ! -1)
• isIE true
• isKeyDown true

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What Remains to Be Done

• Work on cgi interface to bool and wiliki/spectra
  accounts
• Be able to convert to hex file
• Be able to save across sessions somehow.
• Flesh out interface

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Basic Timeline for Completion

• Get Bryant's website up
• Don't know how long this will take
• Understand necessary parts of truth_table code
• Get exporting to .HEX working
• Complete Error Checking module
• Open/Save files
• Usability testing.
• Debug
• Interface to bool.

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Gantt Chart
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Problems

• The website only worked for certain browsers and
  certain versions of browsers
• The way we named the array cells were a little
  difficult to work with
• Apparently, CGI has a small limit on its buffer
  size

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Problems We Expect

• Compatability issues
• Interfacing to Bool/Truthtable program
• Time