Renewal·서른의 생활코딩

Sample Source 3) JavaScript Basic Document Structure (String Object — Application 1)

April 10, 2011·1 min read

cover image

This time, let's briefly test a resident registration number validation program — something commonly seen around us.

<!DOCTYPE html>

<html>

<head>

//<![CDATA[

var ssn="123456-123-456";

var check2=ssn.indexOf("-"); // from the left

var check3=ssn.lastIndexOf("-"); // from the right

document.write(check2 + "<br />");

document.write(check3 + "<br />");

//if((check2!/* position of '-'..*/=6)||(ssn.length!/* total length..*/=14)||(check2!=check3/* there must be only one '-'..*/))

if((check2!=6)||(ssn.length!=14)||(check2!=check3))

{

alert("Invalid resident registration number.");

}

//]]>

</script>

</head>

<body>

</body>

</html>

This English version was translated by Claude.

Written by

Pleasant Charles — UI/UX researcher at AIT. Keeping notes on design, planning, and slow days here since 2010.