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April 12, 2016 05:50
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Convert a Jekyll site's front matter from a 13 digit ISBN, to a 10 digit ASIN and create a direct link to the book's page on Amazon.
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| <script type="text/javascript"> | |
| function ISBN13toISBN10(isbn13) {var start = isbn13.substring(3, 12);var sum = 0;var mul = 10;var i;for(i = 0; i < 9; i++) {sum = sum + (mul * parseInt(start[i]));mul -= 1;}var checkDig = 11 - (sum % 11);if (checkDig == 10) {checkDig = "X";} else if (checkDig == 11) {checkDig = "0";}return start + checkDig;}document.getElementById("isbn10_{{ isbn }}").innerHTML='<a href="http://www.amazon.com/dp/' + ISBN13toISBN10("{{ isbn }}") +'" title="Amazon" target="_blank" >Amazon</a>'; | |
| </script> |
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