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--- isbn-13 [01/12/2006 16:58]
fernando
+++ isbn-13 [29/11/2010 00:00] (current)
@@ Line 9: / Line 9: @@
   * [[http://www.isbn-international.org/en/manual.html|ISBN Users' Manual]]
-  * [[http://www.oclc.org/news/announcements/announcement96.htm|OCLC Interim Support for ISBN 13]] (pdf)
+  * [[http://www.oclc.org/news/announcements/announcement96.htm|OCLC Interim Support for ISBN 13]]
-  * [[http://www.isbn-international.org/en/download/implementation-guidelines-04.pdf|Guidelines for the implementation of 13-digit ISBNs]]
+  * [[http://www.isbn-international.org/en/download/implementation-guidelines-04.pdf|Guidelines for the implementation of 13-digit ISBNs]] (pdf)
+==== Herramientas ====
+  * [[http://code.google.com/p/isbnjs/|isbnjs - An ISBN JavaScript Library]]
+  * [[http://pcn.loc.gov/isbncnvt.html|ISBN Converter (LC)]], incluye algoritmo para generar guiones (aparentemente incompleto): http://pcn.loc.gov/Templates/isbncnvt.js
+Pego aquí el código JS por las dudas:
+<code javascript>
+// **************************************************************
+// Validation/conversion functions for ISBN numbers
+var bAlert;
+function convertISBN(form)
+{
+	// Set default variables and cleanup ISBN
+	var form = document.isbncnvt;
+	form.isbn_in.value = form.isbn_in.value.replace(/[-\s]/g,"").toUpperCase();
+	var isbnnum = form.isbn_in.value;
+	var isbn10exp = /^\d{9}[0-9X]$/;
+	var isbn13exp = /^\d{13}$/;
+	var isbnlen = isbnnum.length;
+	var total = 0;
+	// Preliminary validation
+	if (isbnlen == 0) {
+		alert("Please enter an ISBN to convert in the first box.");
+        form.isbn_in.focus();
+      	form.isbn_in.select();
+       	return false;
+   	}
+	if ((form.isbn_out.value != "") && (isbnlen == 0)) {
+		alert("Please enter the ISBN to convert in the first box.");
+        form.isbn_in.focus();
+        form.isbn_in.select();
+        return false;
+   	}
+   	if (!(isbn10exp.test(isbnnum)) && !(isbn13exp.test(isbnnum))) {
+		if ((isbnlen != 10) && (isbnlen != 13)) {
+ 			alert("This ISBN is invalid." + "\n" +
+		   	      "It contains " + isbnlen + " characters.");
+		}
+		else {
+ 			alert("This ISBN is invalid." + "\n" +
+		   	      "It contains invalid characters.");
+		}
+          	form.isbn_in.focus();
+          	form.isbn_in.select();
+          	return false;
+    	}
+	// Validate & convert a 10-digit ISBN
+	if (isbnlen == 10) {
+		// Test for 10-digit ISBNs:
+		// Formulated number must be divisible by 11
+		// 0234567899 is a valid number
+		for (var x=0; x<9; x++) {
+			total = total+(isbnnum.charAt(x)*(10-x));
+		}
+		// check digit
+		z = isbnnum.charAt(9);
+		if (z == "X") { z = 10; }
+		// validate ISBN
+		if ((total+z*1) % 11 != 0) {   // modulo function gives remainder
+			z = (11 - (total % 11)) % 11;
+			if (z == 10) { z = "X"; }
+			alert("This 10-digit ISBN is invalid." + "\n" +
+			      "The check digit should be " + z + ".");
+			form.isbn_in.focus();
+			form.isbn_in.select();
+			return false;
+		}
+		else {
+			// convert the 10-digit ISBN to a 13-digit ISBN
+			isbnnum = "978"+isbnnum.substring(0,9);
+			total = 0;
+			for (var x=0; x<12; x++) {
+				if ((x % 2) == 0) { y = 1; }
+				else { y = 3; }
+				total = total+(isbnnum.charAt(x)*y);
+			}
+			z = (10 - (total % 10)) % 10;
+		}
+	}
+	// Validate & convert a 13-digit ISBN
+	else {
+		// Test for 13-digit ISBNs
+		// 9780234567890 is a valid number
+		for (var x=0; x<12; x++) {
+			if ((x % 2) == 0) { y = 1; }
+			else { y = 3; }
+			total = total+(isbnnum.charAt(x)*y);
+		}
+		// check digit
+		z = isbnnum.charAt(12);
+		// validate ISBN
+		if ((10 - (total % 10)) % 10 != z) {   // modulo function gives remainder
+			z = (10 - (total % 10)) % 10;
+			alert("This 13-digit ISBN is invalid." + "\n" +
+			      "The check digit should be " + z + ".");
+			form.isbn_in.focus();
+			form.isbn_in.select();
+			return false;
+		}
+		else {
+			// convert the 13-digit ISBN to a 10-digit ISBN
+			if ((isbnnum.substring(0,3) != "978")) {
+				alert("This 13-digit ISBN does not begin with \"978\"" + "\n" +
+				      "It cannot be converted to a 10-digit ISBN.");
+				form.isbn_in.focus();
+				form.isbn_in.select();
+				return false;
+			}
+			else {
+				isbnnum = isbnnum.substring(3,12);
+				total = 0;
+				for (var x=0; x<9; x++) {
+					total = total+(isbnnum.charAt(x)*(10-x));
+				}
+				z = (11 - (total % 11)) % 11;
+				if (z == 10) { z = "X"; }
+			}
+		}
+	}
+	if (form.hyphenate.checked == true) {
+		bAlert = true;
+		form.isbn_in.value = hyphenate(form.isbn_in.value);
+		bAlert = false;
+		form.isbn_out.value = hyphenate(isbnnum+z);
+	}
+	else { 	form.isbn_out.value = isbnnum+z; }
+	return true;
+}//convertISBN(form)
+function hyphenate(isbn)
+{
+var prefix;
+if (isbn.length == 13)	// for 13-digit ISBNs
+{
+	prefix = isbn.substring(0,3) + "-";
+	isbn = isbn.substring(3,13);
+}
+else { prefix = ''; }
+var d = eval(isbn.substring(0,1));	// one digit
+var d2 = eval(isbn.substring(1,3));	// two digits
+var d4 = eval(isbn.substring(1,5));	// four digits
+var objRegExp = "";
+switch(d) {
+	case 0:
+    case 3:
+    case 4:
+/*
+= English-speaking areas
+= German-speaking areas
+= Japan
+*/
+	switch(true) {
+		case (d2 < 20):
+			objRegExp = /(\d)(\d{2})(\d{6})(\w)/;
+	        break;
+        case (d2 < 70):
+			objRegExp = /(\d)(\d{3})(\d{5})(\w)/;
+		  	break;
+        case (d2 < 85):
+			objRegExp = /(\d)(\d{4})(\d{4})(\w)/;
+		  	break;
+        case (d2 < 90):
+			objRegExp = /(\d)(\d{5})(\d{3})(\w)/;
+		  	break;
+        case (d2 < 95):
+			objRegExp = /(\d)(\d{6})(\d{2})(\w)/;
+		  	break;
+        case (d2 <= 99):
+			objRegExp = /(\d)(\d{7})(\d)(\w)/;
+			break;
+        default:
+	        break;
+	}
+	break;
+	case 1:
+/*
+= English-speaking areas
+*/
+	switch(true) {
+		case (d4 < 1000):
+			objRegExp = /(\d)(\d{2})(\d{6})(\w)/;
+	        break;
+        case (d4 < 4000):
+			objRegExp = /(\d)(\d{3})(\d{5})(\w)/;
+			break;
+        case (d4 < 5500):
+			objRegExp = /(\d)(\d{4})(\d{4})(\w)/;
+		  	break;
+        case (d4 < 8698):
+			objRegExp = /(\d)(\d{5})(\d{3})(\w)/;
+		  	break;
+        case (d4 < 9990):
+			objRegExp = /(\d)(\d{6})(\d{2})(\w)/;
+		 	break;
+        case (d4 <= 9999):
+			objRegExp = /(\d)(\d{7})(\d)(\w)/;
+		  	break;
+        default:
+	        break;
+	}
+	break;
+    case 2:
+/*
+= French-speaking areas
+*/
+	switch(true) {
+		case (d2 < 20):
+			objRegExp = /(\d)(\d{2})(\d{6})(\w)/;
+	        break;
+        case (d2 < 70):
+			objRegExp = /(\d)(\d{3})(\d{5})(\w)/;
+		  	break;
+        case (d2 < 84):
+			objRegExp = /(\d)(\d{4})(\d{4})(\w)/;
+			break;
+        case (d2 < 90):
+			objRegExp = /(\d)(\d{5})(\d{3})(\w)/;
+			break;
+        case (d2 < 95):
+			objRegExp = /(\d)(\d{6})(\d{2})(\w)/;
+		  	break;
+        case (d2 <= 99):
+			objRegExp = /(\d)(\d{7})(\d)(\w)/;
+			break;
+        default:
+	        break;
+	}
+	break;
+    case 9:
+/*
+= Dutch/Flemish-speaking
+*/
+  if (isbn.substring(1,2) == 0) {
+	d2 = isbn.substring(2,4);
+	switch(true) {
+		case (d2 < 20):
+			objRegExp = /(\d{2})(\d{2})(\d{5})(\w)/;
+	        break;
+        case (d2 < 50):
+			objRegExp = /(\d{2})(\d{3})(\d{4})(\w)/;
+		  	break;
+        case (d2 < 70):
+			objRegExp = /(\d{2})(\d{4})(\d{3})(\w)/;
+		  	break;
+        case (d2 < 80):
+			objRegExp = /(\d{2})(\d{5})(\d{2})(\w)/;
+		  	break;
+        case (d2 <= 81):
+			objRegExp = /(\d{2})(\d{6})(\d)(\w)/;
+			break;
+        default:
+	    	break;
+	}
+  }
+/*
+= Israel
+*/
+  if (isbn.substring(1,3) == 65) {
+	d2 = isbn.substring(3,5);
+	switch(true) {
+		case (d2 < 20):
+			objRegExp = /(\d{3})(\d{2})(\d{4})(\w)/;
+	        break;
+        case (d2 < 70):
+			objRegExp = /(\d{3})(\d{3})(\d{3})(\w)/;
+		  	break;
+        case (d2 < 90):
+			objRegExp = /(\d{3})(\d{4})(\d{2})(\w)/;
+		  	break;
+        case (d2 <= 95):
+			objRegExp = /(\d{3})(\d{5})(\d)(\w)/;
+		  	break;
+        default:
+	        break;
+	}
+  }
+/*
+= Singapore
+*/
+  if (isbn.substring(1,3) == 81) {
+	d2 = isbn.substring(3,5);
+	switch(true) {
+		case (d2 < 20):
+			objRegExp = /(\d{3})(\d{2})(\d{4})(\w)/;
+	        break;
+        case (d2 < 30):
+			objRegExp = /(\d{3})(\d{3})(\d{3})(\w)/;
+		  	break;
+        case (d2 <= 40):
+			objRegExp = /(\d{3})(\d{4})(\d{2})(\w)/;
+		  	break;
+        default:
+	        break;
+	}
+  }
+  else { break; }
+        break;
+	default:
+   		break;
+}
+if (objRegExp != "") {
+       isbn = prefix + isbn.replace(objRegExp, "$1-$2-$3-$4");
+}
+else {
+	if (bAlert == true) { alert("Unable to hyphenate this ISBN!"); }
+	isbn = (prefix + isbn).replace(/[-]/g,"");
+}
+return isbn;
+}//hyphenate(isbn)
+</code>
+{{tag>catalogacion}}

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