JQUERY TRIGGER CHANGER Event sur Dom Ready

//You must declare the change event handler before calling trigger() or change() 
//otherwise it won't be fired. 
$(document).ready(function(){

    $('#countrylist').change(function(e){
       // Your event handler
    });

    // And now fire change event when the DOM is ready
    $('#countrylist').trigger('change');
});
M. Wasim Abbasi