1 files changed, 37 insertions, 0 deletions
diff --git a/includes/js/dojox/validate/isbn.js b/includes/js/dojox/validate/isbn.js
new file mode 100644
index 0000000..030c7cf
--- /dev/null
+++ b/includes/js/dojox/validate/isbn.js
@@ -0,0 +1,37 @@
+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;
+	}
+}
+
+}