Mega Code Archive
Data Validation via an onChange event Handler
<![CDATA[
<HTML>
<HEAD>
<TITLE>Text Object Select/Focus</TITLE>
<SCRIPT LANGUAGE="JavaScript">
function isNumber(inputStr) {
for (var i = 0; i < inputStr.length; i++) {
var oneChar = inputStr.substring(i, i + 1)
if (oneChar < "0" || oneChar > "9") {
alert("Please make sure entries are numbers only.")
return false
}
}
return true
}
function checkIt(form) {
inputStr = form.numeric.value
if (isNumber(inputStr)) {
// statements if true
} else {
form.numeric.focus()
form.numeric.select()
}
}
</SCRIPT>
</HEAD>
<BODY onSubmit="checkIt(this); return false">
<FORM>
Enter any positive integer: <INPUT TYPE="text" NAME="numeric"
onChange="checkIt(this.form)"><P>
</FORM>
</BODY>
</HTML>
]]>