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JS-DOS: JavaScript Fake HTML DOS window

Asked by TonyLock,

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TonyLock

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Can someone help me with some JavaScript?

I'm working on a fake MS-DOS console. I've made most of the design so far but I need help with programming the prompts. Here's how I would like it to work:

post-15711-1247902882.gif

I've managed to restore the <blink> tag ;-) so that will help with an authentic look but ideally, I want the the user to be able to type anything in and his enter. When they do, a new line appears saying "Bad command or filename." and below that, the C:\> appears again and the user is able to continue to type stuff in. I would like to add commands like: "ver" or "dir" which shows some text as in the example above.

Here's the code so far, please copy/paste and try it out:

&lt;html&gt;
	&lt;head&gt;
		&lt;title&gt;JS-DOS&lt;/title&gt;
		&lt;meta http-equiv="Page-Enter" content="BlendTrans(Duration=0.25)" /&gt;
		&lt;meta http-equiv="Page-Exit" content="BlendTrans(Duration=0.25)" /&gt;
		&lt;link rel="shortcut icon" href="/dos/favicon.ico" /&gt;
		&lt;meta name="robots" content="noindex" /&gt;
		&lt;style type="text/css" media="all"&gt;
			BODY{
				BackGround:			Black;
				Color:				LightGrey;
				Font-Family:		Courier New, Courier;
				Font-Size:			12pt;
				Font-Weight:		Bold;
				Padding:			10px;
				Overflow:			Auto;
			}
			BLINK{
				Color:				LightGrey;
				Font-Size:			13pt;
			}
		&lt;/style&gt;
		&lt;script type="text/javascript"&gt;
		function Blink() {
		   for(i=0;i&lt;document.all.tags('blink').length;i++){
			  s=document.all.tags('blink')[i];
			  s.style.visibility=(s.style.visibility=='visible')?'hidden':'visible';
		   }
		}
		setInterval('Blink()',500);
		&lt;/script&gt;
	&lt;/head&gt;
	&lt;body bgcolor="Black" scroll="Auto"&gt;
		C:\&gt;&lt;span id="Prompt"&gt;&lt;blink&gt;_&lt;/blink&gt;&lt;/span&gt;
	&lt;/body&gt;
&lt;/html&gt;

I've experimented with the following JS code but I've had litle success getting my dead around it:

		function ProcessKey(){
			var KeyID = event.keyCode;
			var Key = String.fromCharCode(KeyID);
			//document.getElementById("Prompt").innerText += Key;
			var _body = document.getElementsByTagName('body') [0];
			var _div = document.createElement('span');
			var _text = document.createTextNode(Key)
			_div.appendChild(_text);
			_body.appendChild(_div);
		}
		document.onkeyup = ProcessKey;

I'd appreciate any help. Thank you so much.

14 answers to this question

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Grand Master

Comic Book Guy

Posted
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Forgot to say... I've only developed/tested in firefox. Others probably won't work.

Implemented commands:

ver

win

eval [javascript code]

Works on IE8, however eval comes back as undefined. Also comes back as undefined on Firefox 3.5.1.

I used to have a code that I found back in the '90s, that I modified that would end up using up so much memory that it would freeze your browser and most often crash your computer, it was all done through JavaScript; you had to press a button on a web page to activate it. Would love to find that code again and see what it would do on modern browsers and OSes.

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Veteran

TonyLock

Posted
  • Author
Posted

That's fantastic! Thank you :)

Can I ask how to make it so it's not limited to 24 lines? I know I was looking for authenticity but it would look cool if it just when all the way to the bottom on of the screen.

I've made the following mods:

<body bgcolor="Black" onload="init()" onKeyPress="return processKey(event)" scroll="no" style="OverFlow:Hidden">

<textarea readonly id="cmd" style="overflow:hidden; width:100%; height:100%; background-color: #000; color: white; font-family: Courier New; border: none;" onFocus="this.blur()"></textarea>

Also, is it possible to add the BACKSPACE function in there to delete typed characters?

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Rising Star

XgD

Posted
Posted
That's fantastic! Thank you :)

Can I ask how to make it so it's not limited to 24 lines? I know I was looking for authenticity but it would look cool if it just when all the way to the bottom on of the screen.

I've removed the line-limiting code

I've made the following mods:

<body bgcolor="Black" onload="init()" onKeyPress="return processKey(event)" scroll="no" style="OverFlow:Hidden">

<textarea readonly id="cmd" style="overflow:hidden; width:100%; height:100%; background-color: #000; color: white; font-family: Courier New; border: none;" onFocus="this.blur()"></textarea>

Added these changes

Also, is it possible to add the BACKSPACE function in there to delete typed characters?

That code was already there (in Firefox). I've written some IE specific code to make sure that it actually works this time. Command history wasn't working either, but should be now.

XgD

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Veteran

TonyLock

Posted
  • Author
Posted

Nice job :)

I added these lines in BTW:

case "del": return processDel(parameters[0]);

and

function processDel(FileParam){

if(FileParam == undefined){

return "Please specify a file to delete.\n\n";

}else if(FileParam == "*.*"){

return "Yeah, right! You wish.\n\n";

}else{

return "Unable to delete that file.\n\n";

}

}

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