1 files changed, 49 insertions, 0 deletions
diff --git a/js/dojo/dojox/validate/isbn.js b/js/dojo/dojox/validate/isbn.js
new file mode 100644
index 0000000..b6f8b16
--- /dev/null
+++ b/js/dojo/dojox/validate/isbn.js
@@ -0,0 +1,49 @@
+//>>built
+define("dojox/validate/isbn", ["dojo/_base/lang", "./_base"], function(lang, validate){
+// summary: Provides ISBN validation functions in `dojox.validate`
+//
+
+/*=====
+
+	validate = dojox.validate;
+
+=====*/
+
+validate.isValidIsbn = function(/* String */value) {
+	// summary: Validate ISBN-10 or ISBN-13 based on the length of value
+	// value: String
+	//		An ISBN to validate
+	// returns: Boolean
+	var len, sum = 0, weight;
+	if(!lang.isString(value)){
+		value = String(value);
+	}
+	value = value.replace(/[- ]/g,''); //ignore dashes and whitespaces
+	len = value.length;
+
+	switch(len){
+		case 10:
+			weight = len;
+			// 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; // Boolean
+			break;
+		case 13:
+			weight = -1;
+			for(var i = 0; i< len; i++){
+				sum += parseInt(value.charAt(i)) * (2 + weight);
+				weight *= -1;
+			}
+			return sum % 10 == 0; // Boolean
+			break;
+	}
+	return false;
+};
+
+return validate.isValidIsbn;
+});