Buffered Ext.data.Store issues

[GregXII]

Hm, you're right. With an empty set, you get this error: "Start (0) was greater than end (-1)". Shouldn't be too hard to work around though.

Otherwise, if you have even one row in the set, it works fine, as long as you are returning the correct totalProperty along with your data.

[stevil]

Yeah, Aaron says it's gonna be looked at - the other thing is, it's debug code - look at the comments in the source.

stevil

[GregXII]

In the meantime, this override might help:

           Ext.override(Ext.data.Store, {
                onGuaranteedRange: function() {
                    var me = this,
                        totalCount = me.getTotalCount(),
                        start = me.requestStart,
                        end = ((totalCount - 1) < me.requestEnd) ? totalCount - 1 : me.requestEnd,
                        range = [],
                        record,
                        i = start;

                    if (start > end) {
                        me.guaranteedStart = start;
                        me.guaranteedEnd = undefined;
                        me.totalCount = undefined;
                    }
                    else if (start !== me.guaranteedStart && end !== me.guaranteedEnd) {
                        me.guaranteedStart = start;
                        me.guaranteedEnd = end;

                        for (; i <= end; i++) {
                            record = me.prefetchData.getByKey(i);
                            //<debug>
                            if (!record) {
                                Ext.Error.raise("Record was not found and store said it was guaranteed");
                            }
                            //</debug>
                            range.push(record);
                        }
                        me.fireEvent('guaranteedrange', range, start, end);
                        if (me.cb) {
                            me.cb.call(me.scope || me, range);
                        }
                    }

                    me.unmask();
                }
            });

I've got it working with this. It handles the empty data set as long as the totals are being passed.

[vasyap]

Yes, I am also getting these strange "it was guarantee" errors, here's my configuration:

var _store = Ext4.create('Ext.data.DebugStore', {
    model: 'Project',
    pageSize: 40,
    remoteSort: true,
    buffered: true,
    proxy: {
        type: 'ajax',
        url: '/projects/stats',
        extraParams: {
            project: _projectId,
            datebegin: dateBegin,
            dateend: dateEnd
        },
        reader: {
            root: 'records',
            totalProperty: 'count'
        }
    },
    // autoLoad: true,
            
    folderSort: true,
    sorters: ['name'],
            
    simpleSortMode: true
});
_store.guaranteeRange(0, 39);
_grid = Ext4.create('Ext.grid.Panel', {
    width: $('project_' + _projectId + '_grid').getSize().x, // using it with MochaUI
    height: $('project_' + _projectId + '_grid').getSize().y,// and gray theme
    renderTo: 'project_' + _projectId + '_grid',
    collapsible: false,
    cls: 'x4-nlg',
    frame: false,
    border: 0,
    store: _store,

    // also, the summary feature does not work as expected with buffered/paging grids
    //features: [summary],
    verticalScrollerType: 'paginggridscroller',
    loadMask: true,
    disableSelection: true,
    invalidateScrollerOnRefresh: false,
    columns: this._columns
}); 

With this config and dataset with 200 rows, when I scroll down the grid to its end and then scroll back up to begin, I get "it was guarantee" error (for record with index 1) and infinite loading progress.

[new]

I have the same issue. I want to handle it but I meet another problem, When I load my store, in its load event I check if there is count or not then set guaranteeRange. Actingg like this cover "Start (0) was greater than end (-1) error" but "too much recursion" apears in console!

  eventGridStore.load();
    eventGridStore.on("load", function(){
    if (eventGridStore.getTotalCount() == 0) {
            Ext.MessageBox.show({
                    title: 'Information',
                    msg:'No event!',
                    icon : 'ext-mb-info',
                    buttons: Ext.MessageBox.OK
            });
    }else{
            eventGridStore.guaranteeRange(0, ps-1);
    }
    }); 

[GregXII]

new, this is happening because guaranteeRange IS a load action! When you call guaranteeRange, it enters the load event, and calls guaranteeRange again, and again, and again, etc.

Instead of calling eventGridStore.load(), use eventGridStore.guaranteeRange(0, ps-1). No need for the load event listener.

[stevil]

This workaround should get us to the next release:

Ext.Error.handle = function (err) {
    if (err.sourceMethod == "onGuaranteedRange") {
        return true;
    }
}; 

stevil

[new]

Instead of calling eventGridStore.load(), use eventGridStore.guaranteeRange(0, ps-1). No need for the load event listener.

then when there is no data the famous error appears

[stevil]

then when there is no data the famous error appears

@new, try my fix in the post preceding yours - it worked well for me!

stevil

[new]

ok thanks I'll try and inform you