validate the field for valid years

markshen2004 · Jul 28, 2004

I need a field to input the year,I hope the valid value is from 1990 to currect year.

I need write a javascript to validate the field .

Please give me a idea about it.

Thanks a lot

BabyJeffy · Jul 28, 2004

Here is an example page that you can save. Is shows 3 different ways of calling the small Javascript function... using an onchange, using a button in the form, or using a href. You can of course call it directly from any other javascript code and modify it to return true or false.

I hope this gets you started

Code:

<html>
<head>
<title>Test</title>

<script type="text/javascript">
// checks to see if the data passed in is a 4 digit year between now and 1900
function checkIsValid(_data)
{
 var _thisYear = new Date().getFullYear();
	
 if (_data.length != 4) return "This is not valid";
 if (!_data.match(/\d{4}/)) return "This is not valid";
 if (parseInt(_data) > _thisYear || parseInt(_data) < 1900)
  return "This is not valid";
 return "This is valid";
}
</script>
</head>

<body>
<form name="myForm">
<input type="text" name="theYear" maxlength="4" value="" onchange="alert(checkIsValid(this.value));"/>
<input type="button" value="Test if Valid" onclick="alert(checkIsValid(this.form.theYear.value));" />
</form>
<p>Click <a href="javascript: alert(checkIsValid(document.myForm.theYear.value)); ">here</a> to check content is valid</p>
</body>
</html>

Jeff

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validate the field for valid years

markshen2004

Programmer

BabyJeffy

Programmer

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