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Posted 19 Dec 2016
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Engineering Calculator VOLTA-2013

, 27 Nov 2012
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Productivity software implemented as pure HTML5/CSS3/Javascript solution, encapsulated in a single text file does not require any image files. Can run in all major browsers, and also is intended to add ability of standalone operations under Windows OS on Ultrabooks.
This is an old version of the currently published article.

Editorial Note

This article is an entry in our AppInnovation Contest. Articles in this sub-section are not required to be full articles so care should be taken when voting.


Engineering Calculator VOLTA-2012 is implemented as HTML 5 web application project that adheres to software paradigm of separation of programming concerns, namely:

  • Content: HTML5
  • Presentation: CSS3
  • Functionality: Javascript/jQuery

Entire project is encapsulated in a single text file with extremely small digital footprint (less than 10kB). It does not require any graphic files, like .jpg or .png, etc. All aesthetic enhancements, like: rounded corners, color gradients, borders and shadows are achieved exclusively via CSS3 styling, thus resulting in small application footprint and very fast web page load.

Note: this project is submitted to The Windows 8* & Ultrabook™ App Innovation Contest.

Category 1: Productivity

Category 2: Education

Platform: Windows 8 desktop

Ultrabook-specific features

  • Touch-screen and standard PC mouse operation  modes
  • GPS/Geolocation-based Find Job application extension (Jobrica-2013)

Proposed solution should be able to run in Desktop/Metro modes .


Engineering Calculator VOLTA-2013 extends the capability and application scope of its predecessor, previously published online [1,2] and partially described on Codeproject [3].


Working Demo of Engineering Calculator VOLTA-2011 developed exclusively with HTML5/CSS3 and jQuery is available online: click on the snapshot image shown below and you will be redirected to the demo page implemented fully-functional calculator:

Fig.1: Engineering Calculator VOLTA-2011


Volta-2013 is updated desktop version of Electrical Engineering calculator. It's installer was generated using Intel AppUp encapsulator [4]. Online User Manual [1] covers use cases pertinent to the previous model (Volta-2011) and current one. Sample screenshots follows, demonstrating various styling options, namely: rounded corners, High/Low contrast, light background.

Fig 2: Engineering Calculator Volta-2013 for Win 8 desktop

Fig 3: Calculator Volta-2013 with rounded corner

Fig 4: Calculator Volta-2013 with 'Light' background

Fig 5: Calculator Volta-2013 app icon

Using the code 

The code base of existing Calculator VOLTA-2011 has been documented, commented and discussed online [2]. Dynamic styling was added to current version using jQuery and CSS3 include files, as shown in the following example pertinent to toggle rounded corners On/Off:

Listing 1. Round Corners Style (CSS3)  
div#keyPad button,
div#keyPad input,
div#eeMain div.eeStyleControl,
div#eeMain div#eeRounded,
    -moz-border-radius<span class="code-none">: 10px<span class="code-none">;
    -webkit-border-radius<span class="code-none">: 10px<span class="code-none">;
    border-radius<span class="code-none">: 10px<span class="code-none">;
<span class="code-none">} </span></span></span></span></span></span></span>
Listing 2. jQuery code snippet to toggle Round Corners On/Off 
// ROUNDED CORNER On/Off ********************
$("div#eeRounded").click(function () {
   //get all stylesheets
   var styleSheets = document.styleSheets;
   // toggle stylesheet identified by href
   var href = 'RoundedCorner.css';
   for (var i = 0; i < styleSheets.length; i++) {
       if (styleSheets[i].href.toString().indexOf(href) >= 0) {
            styleSheets[1].disabled = !(styleSheets[1].disabled);

Similar jQuery technique was used for dynamic load/unload of CSS3 files related to Low/High contrast and backround selection (see the snippets following)

Listing 3. CSS stylesheet file pertinent to 'Light' background palette
Project          :  Engineering Calculator VOLTA-2013
Module           :  Light.css
Description      :  CSS3 color properties to produce 'Light' background
Author           :  Alexander Bell
Copyright        :  2011-12 Infosoft International Inc
DISCLAIMER: This Application is provide on AS IS basis without any warranty
You can use it at your sole risk.
TERMS OF USE     :  This module is copyrighted.

div#eeMain {  background-color<span class="code-none">: #dedede<span class="code-none">; <span class="code-none">}

div.voltESeries <span class="code-none">{ background-color<span class="code-none">: #eaeaea<span class="code-none">;  <span class="code-none">}

input#keyPad_Mem  <span class="code-none">{ background-color<span class="code-none">: #f8f8f8<span class="code-none">;  <span class="code-none">}

table.tabESeries <span class="code-none">{ color<span class="code-none">: #202020<span class="code-none">; <span class="code-none">}

div#eeModel <span class="code-none">{ color<span class="code-none">: #005500<span class="code-none">; <span class="code-none">}

button.keyPad_btnMemOp <span class="code-none">{  color<span class="code-none">: #005500<span class="code-none">;<span class="code-none">}

<span class="code-comment">/* BACKSPACE/CLEAR INPUT KEYS*/
div#keyPad button#keyPad_btnBack,
div#keyPad button#keyPad_btnClr,
div#keyPad button#keyPad_btnAllClr {color<span class="code-none">:red<span class="code-none">;<span class="code-none">}

div.voltESeries <span class="code-none">{ border<span class="code-none">: 1px solid #d0d0d0<span class="code-none">; <span class="code-none">}

button:hover <span class="code-none">{ background<span class="code-none">: #d9d9d9<span class="code-none">; <span class="code-none">}

button:active <span class="code-none">{	border<span class="code-none">: solid 2px #909090<span class="code-none">; <span class="code-none">}

<span class="code-comment">/* odd rows style */
table.tabESeries tr:nth-child(odd) { background-color<span class="code-none">: #f0f0f0<span class="code-none">; <span class="code-none">}

<span class="code-comment">/* even rows style */
table.tabESeries tr:nth-child(even) { background-color<span class="code-none">: #eaeaea<span class="code-none">; <span class="code-none">}

<span class="code-comment">/* Table hover style */
table.tabESeries tr:hover {background-color<span class="code-none">: #dadada<span class="code-none">; color<span class="code-none">: #101010<span class="code-none">;<span class="code-none">}
Listing 4.jQuery code snippet to select High/Low contrast and background
// SELECT COLOR PALETTE ************************
$("div.eeStyleControl").click(function () {

        // disable all color styles

        // add appropriate color style
        switch ( {
            case 'eeNContrast': $('head').append('<link type="text/css" href="Style/ContrastNormal.css" rel="stylesheet" />'); break;
            case 'eeHContrast': $('head').append('<link type="text/css" href="Style/ContrastHigh.css" rel="stylesheet" />'); break;
            case 'eeLight': $('head').append('<link type="text/css" href="Style/Light.css" rel="stylesheet" />'); break;
            default: break;


Jobrica-2013 is Windows 8 desktop/Ultrabooks application extension using GPS/Geolocation service in order to find Job Agencies in a search area nearby. It implements dedicated web page powered by Microsoft Bing technology [6] and desktop installable app, that allows obtaining geo-coordinates in real-time mode (in case geo-location service is enabled) and composing a web-query to the said page (see the sample screenshots following):

Fig 6: Jobrica-2013 desktop app for Win8/Ultrabooks, sample screenshot

Fig 7: Interactive map shows Job Agencies nearby, sample screenshot

Points of Interest

Jobrica-2013 implements multi-modal Voice-enhanced User Interface utilizing Windows 8 Speech object library, in particular, TTS (Text-to-Speech) options.


  • HTML5 web application Engineering Calculator VOLTA-2011 has been released in the year 2011 [1,2] and tested in all major web browsers on PC platform
  • Calculator VOLTA-2011 has been tested on new Apple iPad version (a.k.a. iPad 3) [5].
  • Engineering Calculator VOLTA-2013 desktop version 8.1.2 was developed, submitted and approved for publishing in Intel's AppUp  


  1. Online Engineering Calculator Volta-2011, User Manual[^]
  2. Online Engineering Calculator Volta-2011, Design Notes[^]
  3. Engineering Calculator VOLTA-2011
  4. Intel AppUp encapsulator
  5. New iPad 3 is here: quick notes from Apple store on Fifth (Mar 17, 2012)
  6. Jobrica-2013 interactive geo-map


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Founder Infosoft International Inc
United States United States
Dr. Alexander Bell is a seasoned full-stack Software Engineer (Win/Web/Mobile). He holds PhD in EE/IT, authored 37 inventions and published 300+ technical articles. Currently focused on Java/Javascript, .NET/C#, Android/Mobile, SQL, 'Big Data', Machine Learning, AI, IoT. Alex participated in App Innovation Contests (AIC 2102/2013) with multiple winning submissions. Portfolio samples:

  1. Real-time NY Bus Tracking Web App (IoT)
  2. Android Fraction Calculator "Fractal MK-12"
  3. Android Prime Factorization Calculator 18-digit)
  4. Semaphon™ semantic phone num-to-text converter
  5. Educational Web Portal
  6. Free Online NY Payroll Tax Calculator
  7. WebTV powered by YouTube Player powered by .NET API (#1 on Google)
  8. Engineering Calculator VOLTA
  9. Big Data: Facebook and YouTube
  10. NY City Trivia Quiz
  11. Publications by A. Bell

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GeneralMy vote of 5 Pin
Akram El Assas9-Oct-12 21:33
memberAkram El Assas9-Oct-12 21:33 
GeneralRe: My vote of 5 Pin
DrABELL10-Oct-12 2:05
memberDrABELL10-Oct-12 2:05 

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