如何等待所有商店在ExtJs中同步？

Question

I have a list of grids that can change their data in form by end-user. Finally, I want to sync all the grids by clicking the button, then an operation is performed.

I wrote the code below:

$.when.apply(
    Ext.ComponentQuery.query('grid')
       .forEach(function(item) {
             if (item.getXType() == "grid") {
                if (item.store.getNewRecords().length > 0 || item.store.getUpdatedRecords().length > 0 || item.store.getRemovedRecords().length > 0) {
                    item.store.sync();
                 }
             }
})).then(function (results) {
    //do something
});

Problem is here that store.sync() not waiting for callback.

What is the recommended way of doing this?

Answer 1

I do it with Promise like this:

 // Sync grid data if exist dirty data
 Promise.all(
     Ext.ComponentQuery.query('grid')
     .map(grid => grid.getStore())
     .filter(s => (s.getNewRecords().length + s.getUpdatedRecords().length + s.getRemovedRecords().length) > 0)
     .map(s => new Promise((resolve, reject) => {
           s.sync({
               success: () => { resolve(); },
               failure: () => { reject(); }
           });
      }))
      ).then(() => {
           //do something
      });

Answer 2

You could use callback for your store.sync() method.

The callback function to be called upon completion of the sync. The callback is called regardless of success or failure and is passed the following parameters: (batch, options).

You could achieve your requirement like this

1. Take a blank array name before loop. like this var gridIds=[] .

2. In side of loop before store.sync() push grid id in above array.

3. Now in callback function remove that grid id from above array and check condition array is blank then your all store sync response has came.

You can check here with working Fiddle

Note I have used dummy api. Please use your actual api.

CODE SNIPPET

Ext.application({
    name: 'Fiddle',

    launch: function () {

        Ext.define('MyStore', {
            extend: 'Ext.data.Store',

            alias: 'store.mystore',

            fields: ['name'],

            autoLoad: true,

            pageSize: 25,

            remoteSort: true,

            proxy: {
                type: 'ajax',
                method: 'POST',
                api: {
                    read: 'data.json',
                    update: 'your_update_api',
                    create: 'your_create_api',
                    destroy: 'your_delete_api'
                },
                reader: {
                    type: 'json'
                },
                writer: {
                    type: 'json',
                    encode: true,
                    root: 'data'
                }
            },
        });

        Ext.define('MyGrid', {

            extend: 'Ext.grid.Panel',

            alias: 'widget.mygrid',

            store: {
                type: 'mystore'
            },

            height: 200,

            border: true,

            tools: [{
                xtype: 'button',
                iconCls: 'fa fa-plus-circle',
                tooltip: 'Add New Record',
                handler: function () {
                    let grid = this.up('grid'),
                        store = grid.getStore();

                    store.insert(0, {
                        name: 'Test ' + (store.getCount() + 1)
                    });
                }
            }],
            columns: [{
                text: 'Name',
                dataIndex: 'name',
                flex: 1
            }]
        });

        Ext.create({
            xtype: 'panel',
            // title: 'Store sync example',

            items: [{
                xtype: 'mygrid',
                title: 'Grid 1'
            }, {
                xtype: 'mygrid',
                title: 'Grid 2'
            }, {
                xtype: 'mygrid',
                title: 'Grid 3'
            }, {
                xtype: 'mygrid',
                title: 'Grid 4'
            }],

            bbar: ['->', {
                text: 'Submit Changes',
                handler: function (btn) {
                    var panel = btn.up('panel'),
                        grids = panel.query('grid'),
                        gtidIds = [],
                        lenthCheck = function (arr) {
                            return arr.length > 0;
                        };

                    grids.forEach(function (grid) {
                        let store = grid.getStore();
                        if (lenthCheck(store.getNewRecords()) || lenthCheck(store.getUpdatedRecords()) || lenthCheck(store.getRemovedRecords())) {
                            panel.mask('Please wait...');
                            gtidIds.push(grid.getId());
                            store.sync({
                                callback: function () {
                                    Ext.Array.remove(gtidIds, grid.getId());
                                    if (gtidIds.length == 0) {
                                        panel.unmask();
                                        Ext.Msg.alert('Info', 'All grid store sync success.');
                                    }
                                }
                            }, grid);
                        }
                    });
                }
            }],
            renderTo: Ext.getBody(),
        })
    }
});