Check for a blank numeric field

JohannIcon · Oct 16, 2002

Hi All

How can I check if a numeric field is empty or not? I managed to do it for text like this:-

if (field.value == "&quot

{
alert("You must Enter some text here&quot

field.focus()
field.select()
return false
}

thanks for your help

mit99mh · Oct 16, 2002

Try somethiong like this

Hope it helps.

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>
<head>
<title>Number Check</title>
</head>
<script>
function checkValue(){
var e = parseInt(document.f.t.value)

if( isNaN(e) ){
alert("NAN" );
}
else{
alert("number" );
}
return false;
}

</script>
<body>
<form action="" method="post" name="f" id="f" onsubmit="return checkValue();">
<input type="text" name="t">
<input type="submit" name="s" value="s">
</form>

</body>
</html>

JohannIcon · Oct 16, 2002

thanks for your help

adam0101 · Oct 17, 2002

How about:
if(field.value.length==0)

http://www.adventex.com

JohannIcon · Oct 18, 2002

Yeah that could be another solution

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Check for a blank numeric field

JohannIcon

Programmer

mit99mh

Programmer

JohannIcon

Programmer

adam0101

Programmer

JohannIcon

Programmer

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