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scrollin.jquery.js
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scrollin.jquery.js
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( function( window ) {
"use strict";
var $ = window.jQuery;
var console = window.console;
var browserHasConsole = typeof console !== undefined;
var instances = [];
var index;
var instance;
///////////// HELPER /////////////////
var Helpers = {
extend: function( a,b ) {
if( typeof a === 'object' && typeof b === 'object' ) {
for( var prop in b ) {
a[ prop ] = b[ prop ];
}
return a;
}
return {};
},
functionExists: function( obj, functionName ) {
return (typeof obj === 'object') && (obj[functionName] !== undefined && typeof obj[functionName] === 'function');
},
functionsExist: function( obj, functionNames ) {
var functionName;
var exists = 0;
if (obj !== undefined && typeof functionNames === 'object') {
for(functionName in functionNames)
{
if (obj[functionNames[functionName]] !== undefined && typeof obj[functionNames[functionName]] === 'function')
{
++exists;
}
}
return exists === functionNames.length;
}
return false;
},
isArray: function( obj ) {
return Object.prototype.toString.call( obj ) === '[object Array]';
},
makeArray: function( obj ) {
var ary = [];
if ( this.isArray( obj ) ) {
ary = obj;
}
else if ( obj !== undefined && obj['length'] !== undefined && typeof obj.length === 'number' ) {
for ( var i=0, len = obj.length; i < len; i++ ) {
ary.push( obj[i] );
}
}
else {
ary.push( obj );
}
return ary;
},
getElementWidth: function( element ) {
if ( typeof element === 'object' ) {
if (typeof element.clip !== "undefined") {
return element.clip.width;
}
else {
if (element.style.pixelWidth) {
return element.style.pixelWidth;
}
else {
return element.offsetWidth;
}
}
}
},
getElementHeight: function( element ) {
if ( typeof element === 'object' ) {
if (typeof element.clip !== "undefined") {
return element.clip.height;
}
else {
if (element.style.pixelHeight) {
return element.style.pixelHeight;
}
else {
return element.offsetHeight;
}
}
}
},
getInstanceName: function( obj ) {
for(var v in window){
try{
if(window[v] instanceof obj){
return v;
}
}
catch(e) {}
};
return false;
},
sendXHRRequest: function( url, method, sync, data, callback ) {
var xhr;
var i;
var readyStateHandler;
var callbackSet;
var methods = ['GET','PUT','POST','DELETE'];
if(typeof XMLHttpRequest !== 'undefined')
{
xhr = new XMLHttpRequest();
}
else
{
var versions = [
"MSXML2.XmlHttp.5.0",
"MSXML2.XmlHttp.4.0",
"MSXML2.XmlHttp.3.0",
"MSXML2.XmlHttp.2.0",
"Microsoft.XmlHttp"
]
for(var i = 0, len = versions.length; i < len; i++)
{
try
{
xhr = new ActiveXObject(versions[i]);
break;
}
catch(e)
{
}
}
}
// Check arguments
url = typeof url === 'string' ? url : '';
sync = typeof sync === 'boolean' ? sync : true;
data = typeof data === 'string' ? data : '';
method = typeof method === 'string' ? method : '';
callbackSet = typeof callback === 'function' ? true : false;
method = methods.join(',').indexOf(method) > -1 ? method : 'GET';
readyStateHandler = function()
{
/**
* 0: uninitialized
* 1: loading
* 2: loaded
* 3: interactive
* 4: complete
**/
if(xhr.readyState < 4)
{
return;
}
if(xhr.status !== 200)
{
return;
}
// Success
if(xhr.readyState === 4)
{
callback(xhr);
}
}
if (!sync)
{
xhr.onreadystatechange = readyStateHandler;
}
xhr.open(method, url, !sync);
xhr.send(data);
return this;
},
sendJSONP: function( url, callback ) {
if (typeof url === 'string')
{
if (typeof callback === 'function')
{
Scrollin.callbacks.jsonp = callback;
}
var script = document.createElement("script");
script.src = url;
document.body.appendChild(script);
}
return this;
},
setFallbacksOnNoSupport: function() {
if (!window.JSON) {
window['JSON'] = {
parse: function (sJSON) { return eval("(" + sJSON + ")"); },
stringify: function (vContent) {
if (vContent instanceof Object) {
var sOutput = "";
if (vContent.constructor === Array) {
for (var nId = 0; nId < vContent.length; sOutput += this.stringify(vContent[nId]) + ",", nId++);
return "[" + sOutput.substr(0, sOutput.length - 1) + "]";
}
if (vContent.toString !== Object.prototype.toString) { return "\"" + vContent.toString().replace(/"/g, "\\$&") + "\""; }
for (var sProp in vContent) { sOutput += "\"" + sProp.replace(/"/g, "\\$&") + "\":" + this.stringify(vContent[sProp]) + ","; }
return "{" + sOutput.substr(0, sOutput.length - 1) + "}";
}
return typeof vContent === "string" ? "\"" + vContent.replace(/"/g, "\\$&") + "\"" : String(vContent);
}
};
}
return this;
},
urlifyObject: function( object, returningString ) {
returningString = typeof returningString === 'string' ? returningString : "";
if (typeof object === 'object')
{
for(index in object)
{
if (typeof object[index] === 'string' || typeof object[index] === 'number' || typeof object[index] === 'boolean')
{
if(returningString.length === 0)
{
returningString += index+'='+object[index];
}
else
{
returningString += '&'+index+'='+object[index];
}
}
else
{
if (typeof object[index] === 'object' && object[index])
{
Helpers.urlifyObject( object[index], returningString );
}
else
{
return returningString;
}
}
}
}
return returningString;
},
validateJSONSchema: function(schema, json) {
},
joinArrays: function( array1, array2 ) {
var index;
if (this.isArray(array1) && this.isArray(array2))
{
for(index in array2)
{
array1.push(array2[index]);
}
}
return array1;
}
};
// Set Fallback implementations if necessary
Helpers.setFallbacksOnNoSupport();
/////////////////////////////////////
///////// DEFINE SCROLLIN ///////////
var Scrollin = (function( elem, options ) {
var handlers;
var defaults;
var state;
var initializedEvent;
if ( !( this instanceof Scrollin ) ) {
instance = new Scrollin(elem, options);
instances.push(instance);
return instance;
}
if( typeof elem === 'string' ) {
elem = document.querySelectorAll( elem );
}
this.handlers = {
onBeforeFetch: { overridable: true, stackEventCallbacks: [], stack: [], dispatchOn: '' },
onFetch: { overridable: true, stackEventCallbacks: [], stack: [], dispatchOn: '' },
onFetchSuccess: { overridable: true, stackEventCallbacks: [], stack: [], dispatchOn: '' },
onFetchFailure: { overridable: true, stackEventCallbacks: [], stack: [], dispatchOn: '' },
onDestroy: { overridable: false, stackEventCallbacks: [], stack: [this.onDestroy], dispatchOn: '' },
onParse: { overridable: true, stackEventCallbacks: [], stack: [this.onParse], dispatchOn: '' },
onLastSet: { overridable: false, stackEventCallbacks: [], stack: [this.onLastSet], dispatchOn: 'scrollin:lastset'},
onComplete: { overridable: false, stackEventCallbacks: [], stack: [this.onCompleted], dispatchOn: 'scrollin:complete'},
onPause: { overridable: false, stackEventCallbacks: [], stack: [], dispatchOn: 'scrollin:pause'},
onResume: { overridable: false, stackEventCallbacks: [], stack: [], dispatchOn: 'scrollin:resume'},
onStart: { overridable: false, stackEventCallbacks: [], stack: [this.onStart], dispatchOn: 'scrollin:start'},
onEnd: { overridable: false, stackEventCallbacks: [], stack: [this.onEnd], dispatchOn: 'scrollin:end'},
onScrolling: { overridable: false, stackEventCallbacks: [], stack: [this.onScrolling], dispatchOn: 'scroll'},
onQueueUpdate: { overridable: false, stackEventCallbacks: [], stack: [this.onQueueUpdate], dispatchOn: 'scrollin:queueupdate' },
onInitialized: { overridable: false, stackEventCallbacks: [], stack: [this.onInitialized], dispatchOn: 'scrollin:initialized' },
onStill: { overridable: true, stackEventCallbacks: [], stack: [], dispatchOn: '' },
onPageEnterView: { overridable: true, stackEventCallbacks: [], stack: [], dispatchOn: '' },
onPageLeaveView: { overridable: true, stackEventCallbacks: [], stack: [], dispatchOn: '' }
};
defaults = {
scID: (instances.length+1), // - used as identifier
template: "", // - markup for new elements
templateEngine: "", // - engine used for markup
fetch: "", // - url where we will be fetching
debug: false, // - used for development purposes
limit: false, // - max number of results to be displayed per page
dataToPass: {}, // - data to be passed a long on each request for each page
reverse: false, // - Adds results in the reverse direction
loading: {},
done: {},
fillOnLoad: true, // - fills up scroll element with results
data: {}, // - pass data to be accessed within each function
url: true, // - bool or function to update url Ex: #/page/2 or #/<whatever>/{{pageNumber}}/<whatever>
resultHolder: "", // - selector of holder to contain results
resultDataAtrr: "", // - turn off data attributes
triggerfetchpercent: .98,
delay: false,
axis:"y",
apply: {},
maxResultSet: false
};
this.metrics = {
scrollTarget : {
width : 0,
height : 0,
velocity : 0, // px/ms,
lastUpdated : 0, // ms
offset : {
top : 0,
left : 0
},
scroll : {
top: 0,
left: 0,
height: 0,
percentScrolledY: 0,
percentScrolledX: 0
}
},
resultsHolder : {
width : 0,
height : 0,
offset : {
top : 0,
left : 0
}
},
lastResult: {
count : 0,
height: 0
},
network : {
avgResponseTime: 0,
responseTimes: []
}
};
this.timeouts = {
updateScrollVelocity:0
};
this.elements = Helpers.makeArray( elem );
this.options = Helpers.extend( defaults, options);
this.events = {
initialize: new Event('scrollin:initialized'),
scroll: new Event('scrollin:scroll'),
complete: new Event('scrollin:complete'),
queueupdate: new Event('scrollin:queueupdate'),
start: new Event('scrollin:start'),
end: new Event('scrollin:end'),
destroy: new Event('scrollin:destroy'),
pause: new Event('scrollin:pause'),
resume: new Event('scrollin:resume'),
lastset: new Event('scrollin:lastset')
};
this.errors = {
onParseException: new Error('Invalid response format see documentation or override onParse().')
};
this.state = {
resultSet : 0,
limit : this.options.limit,
scrolling : false,
fetching : false,
start : false,
paused : false,
completed : false,
lastset : false
};
this.getHandlers = function() {
return Helpers.extend( {}, this.handlers);
};
this.getState = function() {
return Helpers.extend( {}, this.state);
};
if ( typeof this.options['handlers'] === "object") {
for ( var index in this.options['handlers'] ) {
if ( typeof this.handlers[index] === "object") {
if (this.handlers[index]['overridable'])
{
this.handlers[index]['stack'] = [this.options['handlers'][index]];
}
else
{
this.handlers[index]['stack'].push( this.options['handlers'][index] );
}
}
}
}
this.setResultHolder().updateMetrics().bindHandlers();
this.elements[0].dispatchEvent(this.events.initialize);
});
/* ------- Index --------*/
Scrollin.i = function( scID ) {
if ( instances.length > 0 ) {
for(var index in instances) {
if (instances[index].options.scID === scID) {
return instances[index];
}
}
}
return null;
};
/* ----- Callbacks ----- */
Scrollin.callbacks = {
jsonp: null
};
Scrollin.prototype.at = function( property ) {
switch ( property )
{
case 'start':
if (this.options.reverse === true)
{
return Math.floor(this.metrics.scrollTarget.scroll.percentScrolledY * 100) === 100;
}
else
{
return Math.ceil(this.metrics.scrollTarget.scroll.percentScrolledY * 100) === 0;
}
break;
case 'end':
if (this.options.reverse === true)
{
return Math.ceil(this.metrics.scrollTarget.scroll.percentScrolledY * 100) <= 0;
}
else
{
return Math.floor(this.metrics.scrollTarget.scroll.percentScrolledY * 100) >= 100;
}
break;
case 'complete':
return this.at('end') && this.at('lastset');
break;
case 'lastset':
return this.state.lastset;
break;
case 'triggerdistance':
if(this.options.reverse === true)
{
return (1 - this.options.triggerfetchpercent) >= this.metrics.scrollTarget.scroll.percentScrolledY;
}
else
{
return this.options.triggerfetchpercent <= this.metrics.scrollTarget.scroll.percentScrolledY;
}
break;
}
};
Scrollin.prototype.handlersSet = function( handlerName ) {
var handler;
var handlers = this.getHandlers();
for(handler in handlers) {
if (handler === handlerName && handlers[handler]['stack'].length > 0) {
return handlers[handler]['stack'];
}
}
return [];
};
Scrollin.prototype.dispatchHandler = function( handlerName, scInstance, argument ) {
var handlers = scInstance.handlersSet(handlerName);
var handler;
var func;
var response = [];
if (handlers.length > 0)
{
for(handler in handlers)
{
response.push( handlers[handler]( scInstance, argument, scInstance.options.data ) );
}
}
return response;
};
Scrollin.prototype.checkAndTrigger = function() {
if (!this.is('completed') && !this.at('lastset') && this.at('triggerdistance'))
{
if (!this.state['paused']) {
this.fetch();
}
}
return this;
};
Scrollin.prototype.updateHash = function() {
var url;
// Use defined url
if (typeof this.options.url === 'function')
{
url = this.options.url( this );
if (typeof url === 'string')
{
window.location.hash = url;
}
}
// Default
else
{
window.location.hash = '/page/'+this.getState().resultSet;
}
return this;
};
Scrollin.prototype.loading = function( perform ) {
var img;
if (this.options.loading !== undefined && typeof this.options.loading === 'object')
{
switch ( perform ) {
case 'hide':
// Loading Image
if (this.options.loading.img !== undefined && typeof this.options.loading.img === "string")
{
if (this.cache.loading.img !== undefined)
{
this.elements[0].removeChild( this.cache.loading.img );
this.cache.loading.img = undefined;
}
}
// Custom Handler
else if (this.options.loading.hide !== undefined && typeof this.options.loading.hide === 'function')
{
this.options.loading.hide( this );
}
break;
case 'show':
// Loading Image
if (this.options.loading.img !== undefined && typeof this.options.loading.img === "string")
{
if (typeof this.cache.loading.img !== "object")
{
img = new Image();
img.src = this.options.loading.img;
if(this.options.reverse === true )
{
this.elements[0].insertBefore( img, this.elements[0].firstChild );
}
else
{
this.elements[0].appendChild( img );
}
this.cache.loading.img = img;
}
}
// Custom Handler
else if (this.options.loading.show !== undefined && typeof this.options.loading.show === 'function')
{
this.options.loading.show( this );
}
break;
}
}
return this;
};
/* ------ Options ------ */
Scrollin.prototype.options = {};
Scrollin.prototype.initOptions = function() {
};
/* ------ Metric Logic------ */
Scrollin.prototype.metrics = {};
Scrollin.prototype.timeouts = {};
Scrollin.prototype.updateMetrics = function() {
this.updateScrollTargetMetrics();
this.updateResultsHolderMetrics();
return this;
};
Scrollin.prototype.updateScrollTargetMetrics = function() {
if ( this.elements.length > 0 ) {
this.metrics.scrollTarget.width = Helpers.getElementWidth( this.elements[0] );
this.metrics.scrollTarget.height = Helpers.getElementHeight( this.elements[0] );
this.metrics.scrollTarget.offset.top = this.elements[0].offsetTop;
this.metrics.scrollTarget.offset.left = this.elements[0].offsetLeft;
this.metrics.scrollTarget.scroll.height = this.elements[0].scrollHeight;
this.metrics.scrollTarget.scroll.top = this.elements[0].scrollTop;
this.metrics.scrollTarget.scroll.left = this.elements[0].scrollLeft;
this.metrics.scrollTarget.scroll.scrollY = (this.elements[0].scrollHeight - this.metrics.scrollTarget.height);
this.metrics.scrollTarget.scroll.scrollX = (this.elements[0].scrollWidth - this.metrics.scrollTarget.width);
this.metrics.scrollTarget.scroll.percentScrolledY = (this.elements[0].scrollTop) / (this.elements[0].scrollHeight - this.metrics.scrollTarget.height);
this.metrics.scrollTarget.scroll.percentScrolledX = (this.elements[0].scrollLeft) / (this.elements[0].scrollWidth - this.metrics.scrollTarget.width);
this.metrics.scrollTarget.lastUpdated = (new Date()).getTime();
}
return this;
};
Scrollin.prototype.updateLastResultMetrics = function( results ) {
//console.log( results[0] );
//console.log( typeof results );
};
Scrollin.prototype.updateResultsHolderMetrics = function() {
if ( this.elements.length > 0 ) {
this.metrics.resultsHolder.width = Helpers.getElementWidth( this.elements[0] );
this.metrics.resultsHolder.height = Helpers.getElementHeight( this.elements[0] );
this.metrics.resultsHolder.offset.top = this.elements[0].offsetTop;
this.metrics.resultsHolder.offset.left = this.elements[0].offsetLeft;
}
return this;
};
Scrollin.prototype.updateFetchTriggerDistance = function() {
};
Scrollin.prototype.updateScrollVelocity = function() {
var timeNow = (new Date()).getTime();
this.metrics.scrollTarget.velocity = (this.elements[0].scrollTop - this.metrics.scrollTarget.scroll.top) / (timeNow - this.metrics.scrollTarget.lastUpdated);
return this;
};
/* ------ Handler Logic------ */
Scrollin.prototype.bindHandler = function(target, eventType, handler, handlerName ) {
var scInstance = this;
var eventCallback;
if(target !== undefined && target['addEventListener'] !== undefined && typeof handler === 'function') {
eventCallback = function(event) {
handler( scInstance, event, scInstance.options.data );
};
this.handlers[handlerName]['stackEventCallbacks'].push( eventCallback );
target['addEventListener']( eventType, eventCallback );
}
return this;
};
Scrollin.prototype.bindHandlers = function() {
var handler;
var handlers = this.getHandlers();
for(handler in handlers) {
if ( handlers[handler] !== undefined ) {
if ( handlers[handler]['stack'].length > 0 ) {
for( index in handlers[handler]['stack'] ) {
this.bindHandler( this.elements[0], handlers[handler]['dispatchOn'], handlers[handler]['stack'][index], handler );
}
}
}
}
};
Scrollin.prototype.unbindHandler = function(target, eventType, handler ) {
var scInstance = this;
if(target !== undefined && target['removeEventListener'] !== undefined && typeof handler === 'function') {
target['removeEventListener']( eventType, handler );
}
return this;
};
Scrollin.prototype.unbindHandlers = function() {
var handler;
var handlers = this.getHandlers();
for(handler in handlers) {
if ( handlers[handler] !== undefined ) {
if ( handlers[handler]['stack'].length > 0 ) {
for( index in handlers[handler]['stack'] ) {
this.unbindHandler( this.elements[0], handlers[handler]['dispatchOn'], handlers[handler]['stackEventCallbacks'][index] );
}
}
}
}
};
Scrollin.prototype.onScrolling = function( scInstance, event ) {
scInstance.updateScrollVelocity().updateMetrics();
scInstance.elements[0].dispatchEvent(scInstance.events.scroll);
if (scInstance.at('start'))
{
scInstance.elements[0].dispatchEvent(scInstance.events.start);
}
if (scInstance.at('end'))
{
scInstance.elements[0].dispatchEvent(scInstance.events.end);
}
if (scInstance.at('complete'))
{
scInstance.elements[0].dispatchEvent(scInstance.events.complete);
}
if (!scInstance.is('fetching'))
{
scInstance.checkAndTrigger();
}
};
Scrollin.prototype.onLastSet = function( scInstance, event ) {
scInstance.state.lastset = true;
};
Scrollin.prototype.onStart = function( scInstance, evnet ) {
};
Scrollin.prototype.onEnd = function( scInstance, event ) {
if (!scInstance.is('queueempty') && !scInstance.is('paused'))
{
scInstance.updateResultHolder();
}
};
Scrollin.prototype.onCompleted = function( scInstance, event ) {
scInstance.loading('hide');
return this;
};
Scrollin.prototype.onInitialized = function( scInstance, event ) {
if (scInstance.options.fillOnLoad)
{
scInstance.fill();
}
return scInstance;
};
Scrollin.prototype.onParse = function( scInstance, response ) {
var parsedResults;
try
{
parsedResults = scInstance.applyTemplate( response['results'] );
if (parsedResults.length === 0)
{
scInstance.state.completed = true;
}
}
catch(responseParseException)
{
throw scInstance.errors.onParseException;
}
return parsedResults;
};
Scrollin.prototype.onQueueUpdate = function( scInstance, parsedResponse ) {
if (parsedResponse instanceof Array)
{
if (parsedResponse)
{
scInstance.cache.results.push(parsedResponse[0]);
scInstance.queue.push(parsedResponse[0]);
}
scInstance.elements[0].dispatchEvent(scInstance.events.queueupdate);
}
return scInstance;
};
Scrollin.prototype.onDestroy = function( scInstance ) {
if ( instances.length > 0 ) {
for(var index in instances) {
if (instances[index].options.scID === scInstance.options.scID) {
scInstance.unbindHandlers();
delete instances[index];
instances.splice(index,1);
}
}
}
};
/* -------- Effects ----------- */
Scrollin.prototype.apply = function( perform, data, index ) {
switch ( true ) {
case ('resultBefore' === perform) && (this.options.apply && typeof this.options.apply === 'object' && typeof this.options.apply.resultBefore === 'function'):
case ('resultAfter' === perform) && (this.options.apply && typeof this.options.apply === 'object' && typeof this.options.apply.resultAfter === 'function'):
this.options.apply[perform]( this, data, index);
break;
case ('resultsAfter' === perform) && (this.options.apply && typeof this.options.apply === 'object' && typeof this.options.apply.resultsAfter === 'function'):
case ('resultsBefore' === perform) && (this.options.apply && typeof this.options.apply === 'object' && typeof this.options.apply.resultsBefore === 'function'):
this.options.apply[perform]( this, data);
break;
}
return this;
};
/* ------- Queue Logic -------- */
Scrollin.prototype.queue = [];
/* ------ Fetching Logic ------ */
Scrollin.prototype.fill = function( callback ) {
var that = this;
if (this.metrics.scrollTarget.scroll.height <= this.metrics.scrollTarget.height)
{
this.fetch(function()
{
that.fill();
});
}
};
Scrollin.prototype.fetch = function( callback ) {
this.remoteFetch( callback );
};
Scrollin.prototype.remoteFetch = function( callback ) {
var that = this;
var handlers;
var urlWithData;
var fetchHandler;
var dataToPass = typeof this.options.dataToPass === 'function' ? this.options.dataToPass() : this.options.dataToPass;
dataToPass = Helpers.urlifyObject( Helpers.extend( dataToPass, this.getState() ) );
// Set Remote
this.options.fetch = typeof this.options.fetch === 'object' ? this.options.fetch : {url:this.options.fetch};
this.options.fetch.url = typeof this.options.fetch.url === 'string' ? this.options.fetch.url : "";
this.options.fetch.dataType = typeof this.options.fetch.dataType === 'string' ? this.options.fetch.dataType : 'json';
if (this.options.fetch.url.lastIndexOf('?') === -1)
{
dataToPass = '?' + dataToPass;
}
else if (this.options.fetch.url.lastIndexOf('&') === -1 || this.options.fetch.url.lastIndexOf('&') !== this.options.fetch.url.length )
{
dataToPass = '&' + dataToPass;
}
this.options.fetch.urlWithData = this.options.fetch.url + dataToPass;
fetchHandler = function(response)
{
that.dispatchHandler('onQueueUpdate', that, that.dispatchHandler('onParse', that, response) );
that.updateResultHolder();
// Delay setting indicator to prevent multiple requests
setTimeout(function() { that.state['fetching'] = false; },1000);
if (typeof callback === 'function')
{
callback( that );
}
that.loading('hide');
};
switch(this.options.fetch.dataType.toLowerCase())
{
// Same Domain
case 'json':
break;
// Cross Domain
default:
if (!this.is('queueempty') && !this.is('paused'))
{
that.loading('show');
that.updateResultHolder(function() {
that.loading('hide');
});
}
else
{
that.loading('show');
this.state['fetching'] = true;
Helpers.sendJSONP(this.options.fetch.urlWithData,fetchHandler);
}
break;
}
};
Scrollin.prototype.cacheFetch = function( response, pageNumber ) {
};
/* ------ Results Logic ------ */
Scrollin.prototype.updateResultHolder = function( callback ) {
var that = this;
var index;
var images;
var child;
var children;
var totalHeight = 0;