Add form data parameters when extjs5 datagrid next page

1. extjs submits a form query, and when you click the next page, you cannot bring the form parameters to the past

solve:

---------------------------------------------------------------------

/**

* Automatically add parameters when the form is loaded

*/

store.on('beforeload', function (store, options) {

  // serialize the form

 var conditionStr = qform.getForm().getFieldValues();

        var baseParams = {

               "condition" : Ext.encode(conditionStr),

"limit" : pagesize_combo.getValue()

};

        Ext.apply(store.proxy.extraParams, baseParams);

    });

--------------------------------------------------------------------