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Verify the value of an IP address
Description
Use Javascript to verify the value of an IP address. Check for special cases such as "0.0.0.0" and "255.255.255.255"....View A Script Demo
Use Javascript to verify the value of an IP address. Check for special cases such as "0.0.0.0" and "255.255.255.255"....View A Script Demo
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<HTML>
<HEAD>
<META NAME="Generator" CONTENT="TextPad 4.4">
<LINK href="general.css" rel="stylesheet" type="text/css">
<SCRIPT LANGUAGE="JavaScript">
<!-- Original: Jay Bienvenu -->
<!-- Web Site: http://www.bienvenu.net -->
<!-- Begin
function verifyIP (IPvalue) {
errorString = "";
theName = "IPaddress";
var ipPattern = /^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$/;
var ipArray = IPvalue.match(ipPattern);
if (IPvalue == "0.0.0.0")
errorString = errorString + theName + ': '+IPvalue+' is a special IP address and cannot be used here.';
else if (IPvalue == "255.255.255.255")
errorString = errorString + theName + ': '+IPvalue+' is a special IP address and cannot be used here.';
if (ipArray == null)
errorString = errorString + theName + ': '+IPvalue+' is not a valid IP address.';
else {
for (i = 0; i < 4; i++) {
thisSegment = ipArray[i];
if (thisSegment > 255) {
errorString = errorString + theName + ': '+IPvalue+' is not a valid IP address.';
i = 4;
}
if ((i == 0) && (thisSegment > 255)) {
errorString = errorString + theName + ': '+IPvalue+' is a special IP address and cannot be used here.';
i = 4;
}
}
}
extensionLength = 3;
if (errorString == "")
alert ("That is a valid IP address.");
else
alert (errorString);
}
// End -->
</script>
</HEAD>
<BODY Background=../graphics/grayback.jpg>
<center><BR><BR><BR>
<form>
IP Address:
<input size=15 name="IPvalue">
<input type="submit" value="Verify" onClick="verifyIP(IPvalue.value)";>
</form>
</center>
</BODY>
</HTML>
<HTML>
<HEAD>
<META NAME="Generator" CONTENT="TextPad 4.4">
<LINK href="general.css" rel="stylesheet" type="text/css">
<SCRIPT LANGUAGE="JavaScript">
<!-- Original: Jay Bienvenu -->
<!-- Web Site: http://www.bienvenu.net -->
<!-- Begin
function verifyIP (IPvalue) {
errorString = "";
theName = "IPaddress";
var ipPattern = /^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$/;
var ipArray = IPvalue.match(ipPattern);
if (IPvalue == "0.0.0.0")
errorString = errorString + theName + ': '+IPvalue+' is a special IP address and cannot be used here.';
else if (IPvalue == "255.255.255.255")
errorString = errorString + theName + ': '+IPvalue+' is a special IP address and cannot be used here.';
if (ipArray == null)
errorString = errorString + theName + ': '+IPvalue+' is not a valid IP address.';
else {
for (i = 0; i < 4; i++) {
thisSegment = ipArray[i];
if (thisSegment > 255) {
errorString = errorString + theName + ': '+IPvalue+' is not a valid IP address.';
i = 4;
}
if ((i == 0) && (thisSegment > 255)) {
errorString = errorString + theName + ': '+IPvalue+' is a special IP address and cannot be used here.';
i = 4;
}
}
}
extensionLength = 3;
if (errorString == "")
alert ("That is a valid IP address.");
else
alert (errorString);
}
// End -->
</script>
</HEAD>
<BODY Background=../graphics/grayback.jpg>
<center><BR><BR><BR>
<form>
IP Address:
<input size=15 name="IPvalue">
<input type="submit" value="Verify" onClick="verifyIP(IPvalue.value)";>
</form>
</center>
</BODY>
</HTML>
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