Changeset 2432 for lang/javascript/misc

Timestamp:

12/04/07 21:49:14 (5 years ago)

Author:

ykzts

Message:

lang/javascript/misc/isbn.js: checked ISBN validate.

Files:

• lang/javascript/misc/isbn.js (modified) (1 diff)

lang/javascript/misc/isbn.js

@@ -24 +24 @@
 
   self.parse10 = function(isbn) {
+    var checkdigit = 0;
+    for(var i=10; 10-i < 9; i--)
+      checkdigit += isbn.charAt(10-i) * i;
+    checkdigit = 11 - (checkdigit % 11);
+    if(checkdigit == 10)
+      checkdigit = 'X';
+    else if(checkdigit == 11)
+      checkdigit = 0;
+    if(isbn[9] != checkdigit)
+      return false;
     return isbn;
   };
 
   self.parse13 = function(isbn) {
+    var checkdigit = 0;
+    for(var i=0; i < 12; i++)
+      checkdigit += isbn.charAt(i) * ((!(i % 2) || 3) * 1);
+    checkdigit = 10 - (checkdigit % 10);
+    if(isbn[12] != checkdigit)
+      return false;
     return isbn;
   };