remotemodel.js
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(function ($) {
"use strict";
function RemoteModel(url) {
// private
var PAGESIZE = 50;
var data = {length: 0};
var searchstr = "";
var sortcol = null;
var sortdir = 1;
var h_request = null;
var req = null; // ajax request
// events
var onDataLoading = new Slick.Event();
var onDataLoaded = new Slick.Event();
function init() {
}
function isDataLoaded(from, to) {
for (var i = from; i <= to; i++) {
if (data[i] === undefined || data[i] === null) {
return false;
}
}
return true;
}
function clear() {
$.each(data, function(key) {delete data[key];});
data.length = 0;
}
function ensureData(from, to) {
if (req) {
req.abort();
for (var i = req.fromPage; i <= req.toPage; i++)
data[i * PAGESIZE] = undefined;
}
if (from < 0) {
from = 0;
}
if (data.length > 0) {
to = Math.min(to, data.length - 1);
}
var fromPage = Math.floor(from / PAGESIZE);
var toPage = Math.floor(to / PAGESIZE);
while (data[fromPage * PAGESIZE] !== undefined && fromPage < toPage)
fromPage++;
while (data[toPage * PAGESIZE] !== undefined && fromPage < toPage)
toPage--;
if (fromPage > toPage ||
((fromPage === toPage) && data[fromPage * PAGESIZE] !== undefined)) {
// TODO: look-ahead
onDataLoaded.notify({from: from, to: to});
return;
}
if (h_request !== null) {
clearTimeout(h_request);
}
h_request = setTimeout(function () {
for (var i = fromPage; i <= toPage; i++)
data[i * PAGESIZE] = null; // requested but not available yet
onDataLoading.notify({from: from, to: to});
req = $.ajaxJSON({
url: url,
method: 'get',
callback: onSuccess,
data: {
rows: PAGESIZE,
from_page: fromPage,
to_page: toPage,
// do testów
sort_rules: [{'field': 'entry', 'order': 'asc', 'a_tergo': false}]
},
error: function () {
onError(fromPage, toPage);
}
});
req.fromPage = fromPage;
req.toPage = toPage;
}, 50);
}
function onError(fromPage, toPage) {
common.error_alert(
"error loading pages " + fromPage + " to " + toPage);
}
function onSuccess(ajax_data) {
var from = ajax_data.page * PAGESIZE,
to = from + ajax_data.rows.length;
data.length = ajax_data.records;
$.each(ajax_data.rows, function(i, row) {
data[from + i] = row;
data[from + i].index = from + i;
});
req = null;
onDataLoaded.notify({from: from, to: to});
}
function reloadData(from, to) {
for (var i = from; i <= to; i++)
delete data[i];
ensureData(from, to);
}
// TODO: sortowanie po wielu kolumnach
function setSort(column, dir) {
sortcol = column;
sortdir = dir;
clear();
}
function setSearch(str) {
searchstr = str;
clear();
}
init();
return {
// properties
"data": data,
// methods
"clear": clear,
"isDataLoaded": isDataLoaded,
"ensureData": ensureData,
"reloadData": reloadData,
"setSort": setSort,
"setSearch": setSearch,
// events
"onDataLoading": onDataLoading,
"onDataLoaded": onDataLoaded
};
}
// Slick.Data.RemoteModel
$.extend(true, window, {Slick: {Data: {RemoteModel: RemoteModel}}});
})(jQuery);