Implement a Lazy-Loading Table in a Report (on IBM BPM v7.5)

02

dojo.require("dojox.data.QueryReadStore");
dojo.provide("bt.LazyLoadStore");

dojo.declare("bt.LazyLoadStore", dojox.data.QueryReadStore, {

    lazyLoadFunction: null,

    constructor: function(args) {
        dojo.safeMixin(this,args);
    },

    _fetchItems: function(request, fetchHandler, errorHandler) {
        var serverQuery = request.serverQuery || request.query || {};
        if(!this.doClientPaging) {
            serverQuery.start = request.start || 0;
            if (request.count) {
                serverQuery.count = request.count;
            }
        }
        if(!this.doClientSorting) {
            if(request.sort) {
                var sort = request.sort[0];
                if(sort && sort.attribute) {
                    var sortStr = sort.attribute;
                    if(sort.descending) {
                        sortStr = "-" + sortStr;
                    }
                    serverQuery.sort = sortStr;
                }
            }
        }
        if(this.doClientPaging && this._lastServerQuery!==null && dojo.toJson(serverQuery)==dojo.toJson(this._lastServerQuery)) {
            this._numRows = (this._numRows === -1) ? this._items.length : this._numRows;
            fetchHandler(this._items, request, this._numRows);
        }
        else {            
            var returnData = this.lazyLoadFunction(request);
            this._xhrFetchHandler(returnData, request, fetchHandler, errorHandler);
            this.lastRequestHash = new Date().getTime()+"-"+String(Math.random()).substring(2);
            this._lastServerQuery = dojo.mixin({}, serverQuery);
        }
    }

});