1 files changed, 60 insertions, 0 deletions
diff --git a/ishtar_common/static/js/ishtar.js b/ishtar_common/static/js/ishtar.js
index 655a91eb4..fcaa73053 100644
--- a/ishtar_common/static/js/ishtar.js
+++ b/ishtar_common/static/js/ishtar.js
@@ -1796,3 +1796,63 @@ var render_stats = function(stats_values, name){
         jqvalues, stats_options
     );
 };
+
+var is_valid_isbn = function(str) {
+    var sum, weight, digit, check, i;
+
+    str = str.replace(/[^0-9X]/gi, '');
+
+    if (str.length != 10 && str.length != 13) {
+        return false;
+    }
+
+    if (str.length == 13) {
+        sum = 0;
+        for (i = 0; i < 12; i++) {
+            digit = parseInt(str[i]);
+            if (i % 2 == 1) {
+                sum += 3*digit;
+            } else {
+                sum += digit;
+            }
+        }
+        check = (10 - (sum % 10)) % 10;
+        return (check == str[str.length-1]);
+    }
+
+    if (str.length == 10) {
+        weight = 10;
+        sum = 0;
+        for (i = 0; i < 9; i++) {
+            digit = parseInt(str[i]);
+            sum += weight*digit;
+            weight--;
+        }
+        check = (11 - (sum % 11)) % 11
+        if (check == 10) {
+            check = 'X';
+        }
+        return (check == str[str.length-1].toUpperCase());
+    }
+}
+
+var is_valid_issn = function(str) {
+    var sum, weight, digit, check, i;
+
+    str = str.replace(/[^0-9X]/gi, '');
+
+    if (str.length != 8) {
+        return false;
+    }
+
+	sum = 0;
+	for (i = 0; i < 7; i++) {
+		digit = parseInt(str[i]);
+		sum += digit * (8 - i)
+	}
+	check = 11 - sum % 11;
+	if (check == 10) {
+		check = 'X';
+	}
+	return (check == str[str.length-1].toUpperCase());
+}