June 27th, 2008, 11:11 PM
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Contributing User
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Join Date: Nov 2003
Location: UK
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Help with onkeypress function
you could try something like:
Code:
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<title></title>
<script language="javascript">
<!--//
document.onkeydown = keyListener;
function keyListener(e){
if(!e){
e = window.event;
}
if (document.activeElement.id == "RETENTION")
{
if ((e.keyCode==13 || (e.keyCode >= 48 && e.keyCode <= 57)) == false) {
alert("you can only enter numbers");
e.returnValue = false;
}
}
}
//-->
</script>
</head>
<body>
<table>
<tr>
<td class="fieldHeading">Retention <input type="text" name="RETENTION" id="RETENTION" value="" />
</td>
</tr>
</table>
</body>
</html>
here is another example where the validation is done at submit and places 2 decimal points in the value
Code:
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<title>Check Price Format Page</title>
<script language="javascript">
<!--//
function LTrim(value) {
var re = /\s*((\S+\s*)*)/;
return value.replace(re, "$1");
}
function RTrim(value) {
var re = /((\s*\S+)*)\s*/;
return value.replace(re, "$1");
}
function validateprice(field, itemname) {
if (field.value.length > 0) {
var priceval = "";
field = LTrim(RTrim(field.value));
if (field.charAt(0)=="$" || field.charAt(0)=="£") {
var a = 1;
}
else {
var a = 0;
}
var valid = "0123456789.";
var ok = "yes";
var temp;
var len;
//var c = 0;
for (var i=a; i<field.length; i++) {
temp = "" + field.substring(i, i+1);
if (valid.indexOf(temp) == "-1") ok = "no";
priceval += temp;
}
if (ok == "no") {
alert("Invalid entry! \nYou can only enter a price value.");
}
else {
priceval = priceval * 1000
priceval = Math.round(priceval /10) + ""
while (priceval.length < 3) {priceval = "0" + priceval}
len = priceval.length
priceval = priceval.substring(0,len-2) + "." + priceval.substring(len-2,len)
if (priceval.length > 10) {
alert("Invalid entry!\n\nYou have entered a value to large.\nThe max value can enter is 9999999.99\nyour entry value was " + priceval + ".");
}
else {
document.getElementById(itemname).value = priceval;
}
}
}
}
function validateform() {
return false;
}
//-->
</script>
</head>
<body>
<form name="frm1" action="" method="post" onsubmit="return validateform()">
<input type="text" name="amount" id="amount" maxlength="10" onBlur="javascript:validateprice(this,this.name);" /> :Cost<br />
<input type="text" name="amount2" id="amount2" maxlength="10" onBlur="javascript:validateprice(this,this.name);" /> :Price<br />
<input type="text" name="dat" maxlength="7" /> :Product<br />
<br />
<input type="submit" value="submit" />
</form>
</body>
</html>
__________________
Hope this advise helps. 
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