Override the $.fn.pagination.defaults.nav to rewrite the 'refresh' logic.
$(function(){
var pager = $('#dataObject').datagrid('getPager'); // get the pager of datagrid
pager.pagination({
nav: $.extend({}, $.fn.pagination.defaults.nav, {
refresh: {
iconCls: 'pagination-refresh',
handler: function(){
console.log('refresh')
}
}
})
});
})