JavaScript Console

See Demo
Read about jsConsole in my personal blog

Get jsConsole [HTML + CSS + JS] - last modification on 25 Jan, 2014 [version 0.4]
Get latest version of the library (console.js) - 20 Feb, 2014 [version 0.4]
Get jsConsole Solution prepared for 10 tasks - 25 Jan, 2014 [version 0.4]

In connection with JavaScript course in Telerik Academy I decided to implement a simple JavaScript Console (similar appearance to cmd in Win8), that the aim is writing JavaScript without need for modify existing HTML and CSS. Structural logic (HTML), presentational logic (CSS) and business logic (JavaScript) are completely separated, providing more compactness.

I provide a library (console.js) with pre-implemented JavaScript functions that take care of the modification of HTML code, simulation of IO operations, some mathematical operations, methods for easier parsing arrays, etc.

I have made an association with the C# language - functions are with C# similar names in PascalCase for division from JavaScript functions and entry point - Main method.

Table of Contents

• Requirements for working with the console
• Pre-implemented functions
• Using most important functions
  • SetFontSize
  • SetConsoleSize
  • ConsoleClear
  • ReadLine
  • Write and WriteLine
  • Format
  • GetRandomInt
  • GetRandomFloat
  • AccumulatePixels
  • SplitBySeparator
  • ParseIntCollection
  • ParseFloatCollection
  • ParseElementsToInt
  • ParseElementsToFloat
  • SetSolveButton

Requirements for working with the console

Everything you need is:

HTML-document structuring console, the contents are "pouring" in the div-element with id = "content" (surrounded in yellow).

CSS-document with pre-defined styles.

Library (console.js) with pre-implemented JavaScript functions for easier work with console.

• removing the library does not affect on HTML and CSS logic, but in this case you should have to take care of automatically loading of methods, to simulate IO operations, etc..

Script executing the logic of your program (eg script.js).

How it looks:

Pre-implemented functions

/* jsConsole Library © Martin Nikolov - Version [0.2] */

//
// Library Methods ('public methods' you can use)
//
function SetFontSize(pixels) { ... }

function SetConsoleSize(height, width) { ... }

//
// Console Clear Methods
//
function ConsoleClear() { ... }

function ClearElementChildren(htmlElement) { ... }

//
// Console Reading Methods
//
function ReadLine(textMessage, defaultValue, idName) { ... }

function ReadLineFromElement(fromElement, textMessage, defaultValue, idName) { }

//
// Console Writing Methods
//
function Write(message) { ... }

function WriteLine(message) { ... }

function WriteToElement(message, toElement) { ... }

function WriteLineToElement(message, toElement) { ... }

function Format(str) { ... }

//
// Math
//
function GetRandomInt(min, max) { ... }

function GetRandomFloat(min, max, toFixed) { ... }

function AccumulatePixels(px1, px2) { ... }

//
// Collection elements Parser
//
function SplitBySeparator(string, separators) { ... }

function ParseIntCollection(string, separators) { ... }

function ParseFloatCollection(string, separators) { ... }

function ParseElementsToInt(collection) { ... }

function ParseElementsToFloat(collection) { ... }

//
// Set Solve Problems Button Methods
//
function SetSolveButton(events, textMessage) { ... }

function SetSolveButtonToElement(toElement, events, textMessage) { ... }

Using most important functions

SetFontSize(pixels)

taskName = "SetFontSize";
 
function Main(bufferElement) {
 
    SetFontSize(35);
    WriteLine("Large text!")
}

SetConsoleSize(height, width)

taskName = "SetConsoleSize";
 
function Main(bufferElement) {
 
    SetConsoleSize(50, 400);
    WriteLine("Text!")
}

ConsoleClear()

taskName = "ConsoleClear";
 
function Main(bufferElement) {
 
    for (var i = 0; i < 10; i++) {
        WriteLine("SPAM! SPAM!");
        WriteLine("SPAM! SPAM!");
    }
 
    ConsoleClear();
 
    WriteLine("Off-topic");
    WriteLine("Off-topic");
}

ReadLine(textMessage, defaultValue, idName)

taskName = "ReadLine";
 
function Main(bufferElement) {
 
    var msg1 = ReadLine("Enter message: ");
 
    // With default value
    var msg2 = ReadLine("Enter message: ", "Input with text");
 
    // With default value and set id to the input:text
    var msg2 = ReadLine("Enter message: ",
                        "Input with text and Id", "special-message");
}

Write(message) and WriteLine(message)

taskName = "Write and WriteLine";
 
function Main(bufferElement) {
 
    WriteLine('JUST');
    WriteLine('EXAMPLE');
 
    WriteLine();
 
    Write("ONE ");
    Write("LINE");
}

Format(str)

taskName = "Format";
 
function Main(bufferElement) {
 
    var firstName = "John";
    var secondName = "Snow";
 
    WriteLine(Format("Hello, {0} {1}!", firstName, secondName));
}

GetRandomInt(min, max)

taskName = "GetRandomInt";
 
function Main(bufferElement) {
 
    for (var i = 0; i < 5; i++) {
        WriteLine(GetRandomInt(-10, 10));
    };
}

GetRandomFloat(min, max, precision)

taskName = "GetRandomFloat";
 
function Main(bufferElement) {
 
    for (var i = 0; i < 2; i++) {
        WriteLine(GetRandomFloat(-10, 10));
    };
 
    WriteLine();
 
    for (var i = 0; i < 2; i++) {
        WriteLine(GetRandomFloat(-10, 10, 7));
    };
}

AccumulatePixels(px1, px2)

taskName = "AccumulatePixels";
 
function Main(bufferElement) {
 
    var a = AccumulatePixels('20px', 30); // 20 + 30 = 50px
    var b = AccumulatePixels('20px', '30px'); // 20 + 30 = 50px
    var c = AccumulatePixels(20, 30); // 20 + 30 = 50px
 
    WriteLine('20px + 30 = ' + a);
    WriteLine('20px + 30px = ' + b);
    WriteLine('20 + 30 = ' + c);
    WriteLine();
 
    var d = AccumulatePixels('-20px', 30); // -20 + 30 = 10px
    var e = AccumulatePixels('20px', -30); // 20 + (-30) = -10px
    var f = AccumulatePixels(-20, -30); // -20 + (-30) = -50px
 
    WriteLine('-20px + 30 = ' + d);
    WriteLine('20px + (-30) = ' + e);
    WriteLine('-20 + (-30) = ' + f);
}

SplitBySeparator(string, separators)

taskName = "SplitBySeparator";
 
function Main(bufferElement) {
 
    var text = "{ 1, 2, 3, 4, 5 }";
 
    var separators = [',', ' ', '{', '}'];
    var numbers = SplitBySeparator(text, separators); // Array of strings
 
    for (var i = 0; i < numbers.length; i++) {
        WriteLine(numbers[i]);
    };
}

ParseIntCollection(string, separators)

taskName = "ParseIntCollection";
 
function Main(bufferElement) {
 
    var text = "{ 1, 2, 3, 4, 5 }";
 
    var separators = [',', ' ', '{', '}'];
    var numbers = ParseIntCollection(text, separators); // Array of integers
 
    for (var i = 0; i < numbers.length; i++) {
        WriteLine(numbers[i] + 1);
    };
}

ParseFloatCollection(string, separators)

taskName = "ParseFloatCollection";
 
function Main(bufferElement) {
 
    var text = "{ 1, 2, 3, 4, 5 }";
 
    var separators = [',', ' ', '{', '}'];
    var numbers = ParseFloatCollection(text, separators); // Array of floats
 
    for (var i = 0; i < numbers.length; i++) {
        WriteLine(numbers[i] + 0.1);
    };
}

ParseElementsToInt(collection)

taskName = "ParseElementsToInt";
 
function Main(bufferElement) {
 
    var numbers = ['1', '2', '3', '4', '5'];
    numbers = ParseElementsToInt(numbers); // Array of integers
 
    for (var i = 0; i < numbers.length; i++) {
        WriteLine(numbers[i] + 1);
    };
}

ParseElementsToFloat(collection)

taskName = "ParseElementsToFloat";
 
function Main(bufferElement) {
 
    var numbers = ['1.1', '2.2', '3.3', '4.4', '5.5'];
    numbers = ParseElementsToFloat(numbers); // Array of floats
 
    for (var i = 0; i < numbers.length; i++) {
        WriteLine((numbers[i] + 0.1).toFixed(1));
    };
}

SetSolveButton(events, textMessage)

• If we have functions that have to be performed after data input, we use SetSolveButton. In the the parameter events lists the functions to be performed after pressing the button.
• Notes: To access the data entered by the user (or pass it to function) is necessary to access the property value of the object stores data entered by the user. In the examples below to get the value of the variable firstName must access the property value - firstName.value returns an object of type String.

taskName = "SetSolveButton";
 
function Main(bufferElement) {
 
    var firstName = ReadLine("First name: ");
    var secondName = ReadLine("Second name: ");
 
     SetSolveButton(function () {
        Regard(firstName.value, secondName.value);
        // Function 2
        // Function 3
    });
}
 
function Regard(firstName, secondName) {
    WriteLine(Format("Hello, {0} {1}!", firstName, secondName));
}