Keyboard Event Handler Laboratory

Keyboard Event Handler Laboratory : Key Event : Event onMethod JAVASCRIPT DHTML TUTORIALS

JAVASCRIPT DHTML TUTORIALS » Event onMethod » Key Event »

Keyboard Event Handler Laboratory




/*
JavaScript Bible, Fourth Edition
by Danny Goodman 

John Wiley & Sons CopyRight 2001
*/


<HTML>
<HEAD>
<TITLE>Keyboard Event Handler Lab</TITLE>
<STYLE TYPE="text/css">
TD {text-align:center}
</STYLE>
<SCRIPT LANGUAGE="JavaScript">
function init() {
    document.onkeydown = showKeyDown
    document.onkeyup = showKeyUp
    document.onkeypress = showKeyPress
}
function showKeyDown(evt) {
    evt = (evt) ? evt : window.event
    document.getElementById("pressKeyCode").innerHTML = 0
    document.getElementById("upKeyCode").innerHTML = 0
    document.getElementById("pressCharCode").innerHTML = 0
    document.getElementById("upCharCode").innerHTML = 0
    restoreModifiers("")
    restoreModifiers("Down")
    restoreModifiers("Up")
    document.getElementById("downKeyCode").innerHTML = evt.keyCode
    if (evt.charCode) {
        document.getElementById("downCharCode").innerHTML = evt.charCode
    }
    showModifiers("Down", evt)
}
function showKeyUp(evt) {
    evt = (evt) ? evt : window.event
    document.getElementById("upKeyCode").innerHTML = evt.keyCode
    if (evt.charCode) {
        document.getElementById("upCharCode").innerHTML = evt.charCode
    }
    showModifiers("Up", evt)
    return false
}
function showKeyPress(evt) {
    evt = (evt) ? evt : window.event
    document.getElementById("pressKeyCode").innerHTML = evt.keyCode
    if (evt.charCode) {
        document.getElementById("pressCharCode").innerHTML = evt.charCode
    }
    showModifiers("", evt)
    return false
}
function showModifiers(ext, evt) {
    restoreModifiers(ext)
    if (evt.shiftKey) {
        document.getElementById("shift" + ext).style.backgroundColor = "#ff0000"
    }
    if (evt.ctrlKey) {
        document.getElementById("ctrl" + ext).style.backgroundColor = "#00ff00"
    }
    if (evt.altKey) {
        document.getElementById("alt" + ext).style.backgroundColor = "#0000ff"
    }
}
function restoreModifiers(ext) {
    document.getElementById("shift" + ext).style.backgroundColor = "#ffffff"
    document.getElementById("ctrl" + ext).style.backgroundColor = "#ffffff"
    document.getElementById("alt" + ext).style.backgroundColor = "#ffffff"
}
</SCRIPT>
</HEAD>
<BODY onLoad="init()">
<H1>Keyboard Event Handler Lab</H1>
<HR>
<FORM>
<TABLE BORDER=2 CELLPADDING=2>
<TR><TH></TH><TH>onKeyDown</TH><TH>onKeyPress</TH><TH>onKeyUp</TH></TR>
<TR><TH>Key Codes</TH>
    <TD ID="downKeyCode">0</TD>
    <TD ID="pressKeyCode">0</TD>
    <TD ID="upKeyCode">0</TD>
</TR>
<TR><TH>Char Codes (IE5/Mac; NN6)</TH>
    <TD ID="downCharCode">0</TD>
    <TD ID="pressCharCode">0</TD>
    <TD ID="upCharCode">0</TD>
</TR>
<TR><TH ROWSPAN=3>Modifier Keys</TH>
    <TD><SPAN ID="shiftDown">Shift</SPAN></TD>
    <TD><SPAN ID="shift">Shift</SPAN></TD>
    <TD><SPAN ID="shiftUp">Shift</SPAN></TD>
</TR>
<TR>
    <TD><SPAN ID="ctrlDown">Ctrl</SPAN></TD>
    <TD><SPAN ID="ctrl">Ctrl</SPAN></TD>
    <TD><SPAN ID="ctrlUp">Ctrl</SPAN></TD>
</TR>
<TR>
    <TD><SPAN ID="altDown">Alt</SPAN></TD>
    <TD><SPAN ID="alt">Alt</SPAN></TD>
    <TD><SPAN ID="altUp">Alt</SPAN></TD>

</TR>
</TABLE>
</FORM>
</BODY>
</HTML>