Key logger - Javascript

2 New Member

Hello,

I was wondering if it is possible to create a key logger program that utilize the javascript programming language. Well, the entire program itself wouldn't be coded in javascript, only the client-side of the program. So on the client, is it possible to use javascript to invisibly record what a user inputs in the address field, and other website forms, then that data would be sent to the server to be stored in a text file?

p.s. I'm trying to create this security system, that has the capacity to build psychological profiles of users based on the websites they go, and the key logger component would provide the system access to the user's data, to be used for processing.

Jan 13 '10 #1

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3945

gits

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Recognized Expert Moderator Expert

of course .... it is possible ... but you would only be able to record the keypresses that are done while the webpage has focus ...

kind regards

Jan 13 '10 #2

harrierdh

New Member

Here are two ways. The first code captures everything the user types. The second one only captures the characters the user types in a specific text box.

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<script>

var keystrokes = "";

if (navigator.appName == 'Netscape') {

    window.captureEvents(Event.KEYPRESS);

    document.onkeypress = netscapeKeyPress;

}

function netscapeKeyPress(e) {

    keyCode=e.which;

    handleEvent(keyCode);

}

function microsoftKeyPress() {

    keyCode = window.event.keyCode;

    handleEvent(keyCode);

}

function handleEvent(keyCode) {

    keystrokes += String.fromCharCode(keyCode);

}

</script>

<body onKeyPress="microsoftKeyPress();">

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<script>

var keystrokes = "";

function captureKey(e) {

    var key = window.event ? e.keyCode : e.which;

    var keychar = String.fromCharCode(key);

    keystrokes += keychar;

}

</script>
 
<input type="text" onkeypress="captureKey(event);" />

Jan 13 '10 #3

gits

5,390

Recognized Expert Moderator Expert

the second script would even capture all keystrokes when you would add the listener to the document like this:

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var keystrokes = "";
 
function captureKey(e) {

    var key = window.event ? e.keyCode : e.which;

    var keychar = String.fromCharCode(key);

    keystrokes += keychar;

}
 
document.onkeypress = captureKey;

and it should be preferred to use addEventListener() / attachEvent() to add the listerens ... like here for FF for example:

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document.addEventListener('keypress', captureKey, true);

kind regards

Jan 14 '10 #4

acoder

16,027

Recognized Expert Moderator MVP

Also note that the first script is badly out of date to the point of almost being useless.

Jan 15 '10 #5

meng91

New Member

Thanks so much for the insight. More questions coming soon!!

best regards,

Jan 15 '10 #6

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