I have a html-form with checkboxes. It is required that has been checked by at least one any checkbox. How do I use JavaScript to get the values of all checkboxes, and if there is not one checked among checkboxes then show alert with message?
Since you have tagged this post with jquery
here is a jQuery option.
This function selects all the checkboxes on the page, narrows it down to only the checked ones, then get's the size of the jQuery object.
if ($('input:checkbox').prop('checked').size() == 0)
{
alert('no checkboxes were checked');
}
Hope that helps. :)
// utility function
function toArray(obj) {
var arr = [];
for (var i = 0, len = obj.length; i < len; i++) {
arr[i] = obj[i];
}
return arr;
}
// get the form
var someForm = ...;
// get all elements and check whether any has type "checkbox" and is checked.
var checked = toArray(someForm.elements).some(function (el) {
return el.type === "checkbox" && el.checked;
});
if (!checked) {
alert("please check a box");
}
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