CODICE SORGENTE
<html>
<head>
<script type="text/javascript" language="javascript">
function Mid(String, Start, Length)
{
if (String == null)
return (false);
if (Start > String.length)
return '';
if (Length == null || Length.length == 0)
return (false);
return String.substr((Start - 1), Length);
}
function InStr(String1, String2)
{
var a = 0;
if (String1 == null || String2 == null)
return (false);
String1 = String1.toLowerCase();
String2 = String2.toLowerCase();
a = String1.indexOf(String2);
if (a == -1)
return 0;
else
return a + 1;
}
function Len(string)
{
if (string == null)
return (false);
return String(string).length;
}
</script>
</head>
<body>
<p>
<!-- Mid -->
<input type="text" name="txtMid" value="Ciao a tutti!"> Inizio:
<input type="text" name="txtStart" value="5"> Lunghezza:
<input type="text" name="txtLen" value="4">
<input type="button" value="Mid" onclick="txtMid.value = Mid(txtMid.value, txtStart.value, txtLen.value)"> <br>
<!-- Instr -->
<input type="text" name="txtSource" value="Ciao a tutti!"> Cerca:
<input type="text" name="txtFind" value="o">
<input type="button" value="Instr" onclick="alert(InStr(txtSource.value, txtFind.value))"> <br>
<!-- Len -->
<input type="text" name="txtLength" value="Ciao a tutti!">
<input type="button" value="Len" onclick="alert(Len(txtLength.value))"> </p>
</body>
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