Validate Singapore NRIC

This is a javascript function to validate NRIC for Singapore residents, as well as for those holding work permit, S pass, EP and PR.

function validate(nric) {

if (nric.length != 9) {

return false;

}

var icArray = new Array(9);

for(i = 0; i < 9; i++) {

icArray[i] = nric.charAt(i);

}

icArray[1] *= 2;

icArray[2] *= 7;

icArray[3] *= 6;

icArray[4] *= 5;

icArray[5] *= 4;

icArray[6] *= 3;

icArray[7] *= 2;

var weight = 0;

for(i = 1; i < 8; i++) {

weight += parseInt(icArray[i]);

}

var offset=(icArray[0]==”T”||icArray[0]==”G”)?4:0;

var temp=(offset+weight)%11;

var st=Array(”J”,”Z”,”I”,”H”,”G”,”F”,”E”,”D”,”C”,”B”,”A”);

var fg=Array(”X”,”W”,”U”,”T”,”R”,”Q”,”P”,”N”,”M”,”L”,”K”);

var theAlpha;

if     (icArray[0]==”S”||icArray[0]==”T”) { theAlpha=st[temp]; }

else if(icArray[0]==”F”||icArray[0]==”G”) { theAlpha=fg[temp]; }

if (icArray[8] != theAlpha) {

return false;

}

else {

return true;

}

}