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slick.remotemodel.js
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slick.remotemodel.js
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(function($) {
/***
* A simple, sample AJAX data store implementation.
*
* This can be used as is for a basic JSONP-compatible backend that accepts paging parameters.
*/
function RemoteModel(options) {
// private
var data = {length:0};
var req = null;
var h_req = null;
var defaults = {
pagesize: 50,
url: '',
method: 'jsonp',
response_item: ''
};
var opts = $.extend(defaults, options);
// Events
var onDataLoading = new Slick.Event();
var onDataLoaded = new Slick.Event();
var request_params = {
jsonp: {
callbackParameter: "callback",
cache: true,
},
ajax: {
dataType: 'json',
},
'*': {
success: onSuccess,
error: function() {
onError(fromPage, toPage)
}
}
}
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;
return this;
}
function ensureData(from, to) {
if(req) {
req.abort();
for(var i=req.fromPage; i<=req.toPage; i++) {
data[i * opts.pagesize] = undefined;
}
}
if(from < 0) {
from = 0;
}
var fromPage = Math.floor(from / opts.pagesize);
var toPage = Math.floor(to / opts.pagesize);
while(data[fromPage * opts.pagesize] !== undefined && fromPage < toPage) {
fromPage++;
}
while(data[toPage * opts.pagesize] !== undefined && fromPage < toPage) {
toPage--;
}
if(fromPage > toPage || ((fromPage == toPage) && data[fromPage * opts.pagesize] !== undefined)) {
// TODO: look-ahead
return;
}
if(opts.url == undefined || opts.url == null) {
return;
}
var url = opts.url(fromPage, toPage, opts.pagesize);
if(h_req != null) {
clearTimeout(h_req);
}
h_req = setTimeout(function() {
for(var i=fromPage; i<=toPage; i++) {
data[i * opts.pagesize] = null; // null indicates a 'requested but not available yet'
}
onDataLoading.notify({from:from, to:to});
// Make the AJAX/JSONP call with both the general and specific parameters we need
$[opts.method]($.extend(request_params['*'], request_params[opts.method], {
url: url,
context: {
fromPage: fromPage,
toPage: toPage
}}));
}, 50);
}
function onError(fromPage,toPage) {
throw "Error loading pages " + fromPage + " to " + toPage;
}
function onSuccess(resp) {
if(opts.response_item == null || opts.response_item == '') {
opts.response_item = 'items';
if(typeof resp.items == "undefined" && typeof resp == "object") {
resp.items = resp;
}
}
if (typeof resp.offset == "undefined" || resp.offset == null) {
resp.offset = this.fromPage * opts.pagesize;
}
if ($.isArray(resp) && typeof resp[0][opts.response_item] == "object") {
var strategy = objInArray;
} else if ($.isArray(resp[opts.response_item])) {
var strategy = arrayInObj;
} else {
throw "Could not find '" + opts.response_item + "' in JSONP response!"
}
if (typeof resp.count == "undefined" || resp.count == null) {
resp.count = strategy.count(resp);
}
for (var i = 0; i < resp.count; i++) {
data[resp.offset + i] = strategy.find(resp, i);
data[resp.offset + i].index = resp.offset + i;
}
if (typeof resp.total !== "undefined" && !isNaN(resp.total)) {
data.length = resp.total;
} else {
data.length = Math.max(data.length, resp.offset + resp.count);
}
req = null;
onDataLoaded.notify({from:resp.offset, to:resp.offset + resp.count});
}
function reloadData(from,to) {
for(var i=from; i<=to; i++) {
delete data[i];
}
}
function getOptions() {
return options;
}
function setOptions(options) {
opts = $.extend(defaults, options);
return this;
}
var objInArray = {
find: function(resp, i) {return resp[i][opts.response_item];},
count: function(resp) {return resp.length;}
};
var arrayInObj = {
find: function(resp, i) {return resp[opts.response_item][i];},
count: function(resp) {return resp[opts.response_item].length;}
};
init();
return {
// Properties
"data": data,
// Methods
"clear": clear,
"isDataLoaded": isDataLoaded,
"ensureData": ensureData,
"reloadData": reloadData,
"getOptions": getOptions,
"setOptions": setOptions,
// Events
"onDataLoading": onDataLoading,
"onDataLoaded": onDataLoaded
};
}
// Slick.Data.RemoteModel
$.extend(true, window, { Slick: { Data: { RemoteModel: RemoteModel }}});
})(jQuery);