JavaScript DHTML/Window Browser/Screen — различия между версиями

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Текущая версия на 07:28, 26 мая 2010

Detect the client"s screen

<html>
<body>
<script type="text/javascript">
    document.write("Screen resolution: ")
    document.write(screen.width + "*" + screen.height)
    document.write("<br>")
    document.write("Available view area: ")
    document.write(screen.availWidth + "*" + screen.availHeight)
    document.write("<br>")
    document.write("Color depth: ")
    document.write(screen.colorDepth)
    document.write("<br>")
</script>
</body>
</html>



"deviceXDPI" Example

    
<html>
<body>
<button onclick="alert(screen.deviceXDPI);">device XDPI</button>
<button onclick="alert(screen.deviceYDPI);">device YDPI</button>
</body>
</html>



"deviceYDPI" Example

    
<html>
<body>
<button onclick="alert(screen.deviceXDPI);">device XDPI</button>
<button onclick="alert(screen.deviceYDPI);">device YDPI</button>
</body>
</html>



Displaying the Properties of the Screen Object

<HTML>
<HEAD>
<TITLE>Test</TITLE>
<SCRIPT LANGUAGE="JavaScript">
function displayScreenProperties() {
 with(document) {
  write("<B>height: </B>")
  writeln(screen.height+"<BR>")
  write("<B>width: </B>")
  writeln(screen.width+"<BR>")
  write("<B>colorDepth: </B>")
  writeln(screen.colorDepth+"<BR>")
 }
}
displayScreenProperties()
</SCRIPT>
</HEAD>
<BODY>
</BODY>
</HTML>



"height-2" Example

    
<html>
<body>
<button onclick="alert(screen.height);">Screen Height</button>
</body>
</html>



"logicalXDPI" Example

    
<html>
<body>
<script language="JavaScript">
function function1() {
    var m = screen.logicalXDPI;
    var n = screen.logicalYDPI;
    alert("Screen XDPI =\n"+m); 
    alert("Screen YDPI =\n"+n); 
} 
</script>
<input type="button" value="Click me" onclick="function1();">
</body>
</html>



"logicalYDPI" Example

    
<html>
<body>
<script language="JavaScript">
function function1() {
    var m = screen.logicalXDPI;
    var n = screen.logicalYDPI;
    alert("Screen XDPI =\n"+m); 
    alert("Screen YDPI =\n"+n); 
} 
</script>
<input type="button" value="Click me" onclick="function1();">
</body>
</html>



Screen "availHeight"

    
<html>
<body>
<button onClick=" alert(screen.availHeight);">Available Height</button>
</body>
</html>



Screen availLeft

    
<html>
<body>
<button onclick="alert(screen.availLeft);">AvailLeft</button>
</body>
</html>



Screen "availTop"

    
<html>
<body>
<button onclick="alert(screen.availTop);">AvailTop</button>
</body>
</html>



Screen "availWidth"

    
<html>
<body>
<button onClick="alert(screen.availWidth);">Available Width</button>
</body>
</html>



Screen "bufferDepth" Example

    
<html>
<head>
<script language="JavaScript">
    function function1() {
        if (navigator.appName.indexOf("Microsoft") != -1) {
            var m = screen.bufferDepth;
            alert("The buffering for this screen is "+m);
        } else {
            alert("Netscape: no default for buffering depth"); 
        }
    } 
    function function2() {
        screen.bufferDepth = -1;
        var m = screen.bufferDepth;
        alert("The buffering depth for this screen has been changed to "+m); 
    } 
</script>
</head>
<body>
<input type="button" value="No Buffering" onClick="function1();">
<input type="button" value="Same as Color Depth" onClick="function2();">
</body>
</html>



Screen "colorDepth" Example

    
<html>
<head>
<script language="JavaScript">
    function function1() {
        var m = screen.colorDepth;
        alert("The color depth of the screen is "+m+" bits per pixel"); 
    } 
</script>
</head>
<body bgcolor="#EEEEEE" ondblclick="function1();">
</body>
</html>



Screen font Smoothing Enabled

    
<html>
<body>
<script language="JavaScript">
    function function1() {
        alert(screen.fontSmoothingEnabled);
    }
</script>
<button onclick="function1();">Font Smoothing Enabled</button>
</body>
</html>



Screen update Interval

    
<html>
<body>
<button onclick="screen.updateInterval=2000; alert(screen.updateInterval);">
Update Interval
</button>
</body>
</html>



Screen "width" Example

    
<html>
<body>
<button onclick="alert(screen.width);">Screen Width</button> 
</body>
</html>



Using the const Keyword

<HTML>
<HEAD>
<TITLE>const(ant)</TITLE>
<SCRIPT LANGUAGE="JavaScript">
const FREEZING_F = 32
var cities = ["A", "B", "C", "D", "E"]
var tempsF = [33, 12, 20, 40, 75]
function showData() {
    var tableData = ""
    for (var i = 0; i < cities.length; i++) {
        tableData += "<TR><TD>" + cities[i] + "</TD><TD "
        tableData += (tempsF[i] < FREEZING_F) ? "CLASS="cold"" : ""
        tableData += ">" + tempsF[i] + "</TR>"
    }
    document.getElementById("display").innerHTML = tableData
}
</SCRIPT>
</HEAD>
<BODY onLoad="showData()">
<H1>The const keyword</H1>
<HR>
<TABLE ID="temps">
<TR><TH>City<TH>Temperature</TR>
<TBODY ID="display">
</TBODY>
</TABLE>
</BODY>
</HTML>
Источник — «http://wbex.ru/index.php?title=JavaScript_DHTML/Window_Browser/Screen&oldid=3969»