How to trigger jQuery change event in code

The parameterless form of the change() method triggers a change event. You can write something like:

$(document).ready(function() {
    $("#yourInitialElementID").change(function() {
        // Do something here...
        $(".yourDropDownClass").change();
    });
});

For me

$('#element').val('...').change()

is the best way.

Note: .change() is deprecated in newer versions use .trigger('change') instead.

Use the trigger() method

$(selector).trigger("change");