Why does the jquery change event not trigger when I set the value of a select using val()?

Question

The logic in the change() event handler is not being run when the value is set by val(), but it does run when user selects a value with their mouse

Answer 1

$(":input#single").trigger('change');

This worked for my script. I have 3 combos & bind with chainSelect event, I need to pass 3 values by url & default select all drop down. I used this

$('#machineMake').val('').trigger('change');

And the first event worked.