[Solved] Check for value in drop down before submit

by


This should do what you want.

I iterate over the selected options and count how many times each occurs. On the first detection of a duplicate I add an error message. I also make sure an email was selected. If there are any errors we alert them otherwise the form gets submitted.

(function ($) {

    var form = $('#student_records').parent();

    form.submit(function (event) {

        event.preventDefault();

        var selected = {},
            errors = [];

        form.find('option:selected').each(function (index, elem) {

            var val = $(elem).val().trim();

            if (! selected[val]) {
                selected[val] = 1;
                return;

            } else if (selected[val] == 1) {

                errors.push('Already selected: ' + $(elem).text());
            }

            selected[val] += 1;
        });

        if (! selected[1]) {
            errors.push('Must select email.');
        }

        if (errors.length) {
            alert(errors.join("\n"));
            return;
        }

        form.submit();
    });

}) (jQuery);

2

solved Check for value in drop down before submit