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slick.remotemodel.js
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slick.remotemodel.js
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(function($) {
/***
* A sample AJAX data store implementation.
* Right now, it's hooked up to load all Apple-related Digg stories, but can
* easily be extended to support and JSONP-compatible backend that accepts paging parameters.
*/
function RemoteModel() {
// private
var PAGESIZE = 50;
var data = {length:0};
var sortcol = null;
var sortdir = 1;
var h_request = null;
var req = null; // ajax request
var urlBuilder = null;
var responseItemListName = "items";
// events
var Slick.Event();
var 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() {
for (var key in data) {
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;
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
return;
}
if (urlBuilder == undefined || urlBuilder == null) {
return;
}
var url = urlBuilder(fromPage, toPage, PAGESIZE, sortcol, sortdir);
if (h_request != null)
clearTimeout(h_request);
h_request = setTimeout(function() {
for (var i=fromPage; i<=toPage; i++)
data[i*PAGESIZE] = null; // null indicates a 'requested but not available yet'
onDataLoading.notify({from:from, to:to});
req = $.jsonp({
url: url,
callbackParameter: "callback",
cache: true,
success: onSuccess,
error: function(){
onError(fromPage, toPage)
}
});
req.fromPage = fromPage;
req.toPage = toPage;
}, 50);
}
function onError(fromPage,toPage) {
alert("error loading pages " + fromPage + " to " + toPage);
}
function onSuccess(resp) {
if (typeof resp.offset == "undefined" || resp.offset == null) {
resp.offset = this.fromPage*PAGESIZE;
}
if (typeof resp.count == "undefined" || resp.count == null) {
resp.count = resp.items.length;
}
var from = resp.offset, to = from + resp.count;
data.length = parseInt(resp.total);
for (var i = 0; i < resp[responseItemListName].length; i++) {
data[from + i] = resp[responseItemListName][i];
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);
}
function setSort(column,dir) {
sortcol = column;
sortdir = dir;
clear();
}
function setUrlBuilder(fn) {
urlBuilder = fn;
}
function setReponseItemListName(n) {
responseItemListName = n;
}
init();
return {
// properties
"data": data,
// methods
"clear": clear,
"isDataLoaded": isDataLoaded,
"ensureData": ensureData,
"reloadData": reloadData,
"setSort": setSort,
"setUrlBuilder": setUrlBuilder,
"setReponseItemListName": setReponseItemListName,
// events
"onDataLoading": onDataLoading,
"onDataLoaded": onDataLoaded
};
}
// Slick.Data.RemoteModel
$.extend(true, window, { Slick: { Data: { RemoteModel: RemoteModel }}});
})(jQuery);