Why page is reloaded when press enter in textbox?

Chrome, Opera and safari require event handler return false to stop

event propagation, or else, press enter cause browser reload the page.

$("#QueryPanel input").keypress(function(e){
                    if (e.which == 13) {
                        dataCache.remove(0,dataCache.length-1);
                        doQuery(null,true);
                        e.stopPropagation();
                        
                        return false;
                    }
            });