engine/app/assets/javascripts/locomotive/plugins/smartupdater.js

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/**
* smartupdater - jQuery Plugin
*
* Version - 2.0.0
*
* Copyright (c) 2010 Vadim Kiryukhin
* vkiryukhin@gmail.com
*
* Dual licensed under the MIT and GPL licenses:
* http://www.opensource.org/licenses/mit-license.php
* http://www.gnu.org/licenses/gpl.html
*
* Based on the work done by Terry M. Schmidt and the jQuery ekko plugin.
*
* USAGE:
*
* $("#myObject").smartupdater({
* url : "demo.php",
* minTimeout : 60000
* }, function (data) {
* //process data here;
* }
* );
*
* Public functions:
* $("#myObject").smartupdaterStop();
* $("#myObject").smartupdaterRestart();
* $("#myObject").smartupdaterSetTimeout();
*
* Public Attributes:
* var smStatus = $("#myObject")[0].smartupdaterStatus.state; // "ON" | "OFF" | "undefined"
* var smTimeout = $("#myObject")[0].smartupdaterStatus.timeout; // current timeout
*
**/
(function(jQuery) {
jQuery.fn.smartupdater = function (options, callback) {
return this.each(function () {
var elem = this;
elem.settings = jQuery.extend({
url : '', // see jQuery.ajax for details
type : 'get', // see jQuery.ajax for details
data : '', // see jQuery.ajax for details
dataType : 'text', // see jQuery.ajax for details
minTimeout : 60000, // Starting value for the timeout in milliseconds; default 1 minute.
maxTimeout : ((1000 * 60) * 60), // Default 1 hour.
multiplier : 2, //if set to 2, interval will double each time the response hasn't changed.
maxFailedRequests : 10 // smartupdater stops after this number of consecutive ajax failures;
}, options);
elem.smartupdaterStatus = {};
elem.smartupdaterStatus.state = '';
elem.smartupdaterStatus.timeout = 0;
var es = elem.settings;
es.prevContent = '';
es.originalMinTimeout = es.minTimeout;
es.failedRequests = 0;
es.response = '';
function start() {
$.ajax({url: es.url,
type: es.type,
data: es.data,
dataType: es.dataType,
success: function (data) {
if(es.dataType == 'json') {
es.response = JSON.stringify(data);
if ( data.smartupdater) {
es.originalMinTimeout = data.smartupdater;
}
} else {
es.response = data;
}
if (es.prevContent != es.response) {
es.prevContent = es.response;
es.minTimeout = es.originalMinTimeout;
es.periodicalUpdater = setTimeout(start, es.minTimeout);
elem.smartupdaterStatus.timeout = es.minTimeout;
callback(data);
} else if (es.multiplier > 1) {
es.minTimeout = (es.minTimeout < es.maxTimeout) ? Math.round(es.minTimeout * es.multiplier) : es.maxTimeout;
es.periodicalUpdater = setTimeout(start, es.minTimeout);
elem.smartupdaterStatus.timeout = es.minTimeout;
}
es.failedRequests = 0;
elem.smartupdaterStatus.state = 'ON';
},
error: function() {
if ( ++es.failedRequests < es.maxFailedRequests ) {
es.periodicalUpdater = setTimeout(start, es.minTimeout);
elem.smartupdaterStatus.timeout = es.minTimeout;
} else {
clearTimeout(es.periodicalUpdater);
elem.smartupdaterStatus.state = 'OFF';
}
}
})
}
es.fnStart = start;
start();
});
};
jQuery.fn.smartupdaterStop = function () {
return this.each(function () {
var elem = this;
clearTimeout(elem.settings.periodicalUpdater);
elem.smartupdaterStatus.state = 'OFF';
});
};
jQuery.fn.smartupdaterRestart = function () {
return this.each(function () {
var elem = this;
clearTimeout(elem.settings.periodicalUpdater);
elem.settings.minTimeout = elem.settings.originalMinTimeout;
elem.settings.fnStart();
});
};
jQuery.fn.smartupdaterSetTimeout = function (period) {
return this.each(function () {
var elem = this;
clearTimeout(elem.settings.periodicalUpdater);
this.settings.originalMinTimeout = period;
this.settings.fnStart();
});
};
})(jQuery);
/******************************************************
* http://www.JSON.org/json2.js
* 2010-03-20
*
* Public Domain.
*
* NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.
*
* See http://www.JSON.org/js.html
*********************************************************/
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