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if(!dojo._hasResource["dojox.validate.isbn"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
dojo._hasResource["dojox.validate.isbn"] = true;
dojo.provide("dojox.validate.isbn");
dojox.validate.isValidIsbn = function(/* String */value) {
// summary: Vadlidate ISBN-10 or ISBN-13 based on the length of value
// returns: Boolean
var len, sum, weight;
if(typeof value!='string'){
value = String(value);
}
value = value.replace(/[- ]/g,''); //ignore dashes and whitespaces
len = value.length;
sum = 0;
if(len == 10){
weight = 10;
// ISBN-10 validation algorithm
for(var i = 0; i< 9; i++){
sum += parseInt(value.charAt(i)) * weight;
weight --;
}
var t = value.charAt(9).toUpperCase();
sum += t == 'X' ? 10 : parseInt(t);
return sum % 11 == 0;
}else if(len == 13) {
weight = -1;
for(var i=0; i< len; i++){
sum += parseInt(value.charAt(i)) * (2 + weight);
weight *= -1;
}
return sum % 10 == 0;
}else{
return false;
}
}
}
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