Validate Numeric Value

[stan8450]

I am validating a form in Dreamweaver using JavaScript. I would like a user to only enter a numeric value in a text field.


i.e.
if (IsNumeric(document.calcform.SqFt.value) == "&quot
{
alert ( "Please enter in the approximate Square Footage of you house." );
document.calcform.SqFt.focus();
valid = false;
return;
thanx for any help

 

[xutopia]

function isNumeric(str)
{
var myNum = new Number(str)
return (!isNaN(myNum))
} Gary

http://www.xutopia.com

Haran

 

[trollacious]

Call this function using the form element value as the argument:

function isNumeric(onevalue)
{
var digits='0123456789';
for (var oi=0;oi<onevalue.length;oi++)
{
var onechar=onevalue.charAt(oi)
if (digits.indexOf(onechar)==-1)
{
alert ( &quot;Please enter in the approximate Square Footage of your house.&quot; );
document.calcform.SqFt.focus();
return false;
}
}
return true;
}

 

[AnakinPt]

there's a easier way using regexps.

var intnumber=/^\d+$/;
var floatnumber=/^\d+\.\d+$/;

if (!intnumber.exec(myform.myintfield.value) || !floatnumber.exec(myform.myfloatfield.value)){
  alert('Incorrect number');
}


 Anikin
Hugo Alexandre Dias
Web-Programmer
anikin_jedi@hotmail.com

 

[AnakinPt]

there's a easier way using regexps.

var intnumber=/^\d+$/;
var floatnumber=/^\d+\.\d+$/;

if (!intnumber.exec(myform.myintfield.value) || !floatnumber.exec(myform.myfloatfield.value)){
  alert('Incorrect number');
}

Anikin
Hugo Alexandre Dias
Web-Programmer
anikin_jedi@hotmail.com

 

[xutopia]

wouldn't it be test instead of exec?

var intnumber=/^\d+$/;
var floatnumber=/^\d+\.\d+$/;

if (!intnumber.test(myform.myintfield.value) || !floatnumber.test(myform.myfloatfield.value)){
alert('Incorrect number');
} Gary

http://www.xutopia.com

Haran

 

[AnakinPt]

well ... with exec i know it works but as i'm not an expert in JS ... Anikin
Hugo Alexandre Dias
Web-Programmer
anikin_jedi@hotmail.com

 

[xutopia]

exec returns an array with all found occurances. If your array is empty it is considered false so I guess exec works as well but test is faster. Gary

http://www.xutopia.com

Haran