All you have to do is listen to the select and react when it changes.
// Listen to the change of the <select> element
$("#typeofworkday").on("change", function() {
// Check the option value for "ferie" and disable the checkbox
if ($(this).val() === "ferie") {
$("#check1").attr("disabled", "disabled");
// For all other options, enable the checkbox
} else {
$("#check1").removeAttr("disabled");
}
});
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solved How to disable / enable checkbox base on select (option) value [closed]