Please add the 'onEndEdit' event handler for your datagrid.
$('#dtg_test').edatagrid({
onEndEdit:function(index,row){
var editors = $(this).edatagrid('getEditors',index);
for(var i=0; i<editors.length; i++){
var ed = editors[i];
var t = $(ed.target);
if (t.hasClass('textbox-f')){
t.textbox('textbox').trigger('blur')
row[ed.field] = t.textbox('getValue');
}
}
}
});