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var checkboxes = document.getElementsByName("Language selection"); var element = checkboxes[0].form; var valid = false; element.onsubmit = function () { for (var i = 0; i < checkboxes.length; i++) { if (checkboxes[i].checked) { valid = true; break; } } if (valid) { document.getElementById("checkbox-error").style.display = "none"; } else { document.getElementById("checkbox-error").style.display = "block"; } return valid; }
var checkboxes = document.getElementsByName("Choice of volumes"); var element = checkboxes[0].form; var valid = false; element.onsubmit = function () { for (var i = 0; i < checkboxes.length; i++) { if (checkboxes[i].checked) { valid = true; break; } } if (valid) { document.getElementById("checkbox-error").style.display = "none"; } else { document.getElementById("checkbox-error").style.display = "block"; } return valid; }

(Click here for what’s inside each of the volumes)

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