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/*! |
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* Colcade v0.2.0 |
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* Lightweight masonry layout |
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* by David DeSandro |
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* MIT license |
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*/ |
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|
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/*jshint browser: true, undef: true, unused: true */ |
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|
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( function( window, factory ) { |
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// universal module definition |
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/*jshint strict: false */ |
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/*global define: false, module: false */ |
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if ( typeof define == 'function' && define.amd ) { |
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// AMD |
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define( factory ); |
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} else if ( typeof module == 'object' && module.exports ) { |
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// CommonJS |
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module.exports = factory(); |
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} else { |
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// browser global |
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window.Colcade = factory(); |
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} |
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|
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}( window, function factory() { |
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|
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// -------------------------- Colcade -------------------------- // |
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|
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function Colcade( element, options ) { |
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element = getQueryElement( element ); |
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|
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// do not initialize twice on same element |
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if ( element && element.colcadeGUID ) { |
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var instance = instances[ element.colcadeGUID ]; |
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instance.option( options ); |
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return instance; |
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} |
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|
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this.element = element; |
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// options |
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this.options = {}; |
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this.option( options ); |
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// kick things off |
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this.create(); |
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} |
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|
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var proto = Colcade.prototype; |
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|
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proto.option = function( options ) { |
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this.options = extend( this.options, options ); |
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}; |
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|
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// globally unique identifiers |
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var GUID = 0; |
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// internal store of all Colcade intances |
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var instances = {}; |
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|
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proto.create = function() { |
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this.errorCheck(); |
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// add guid for Colcade.data |
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var guid = this.guid = ++GUID; |
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this.element.colcadeGUID = guid; |
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instances[ guid ] = this; // associate via id |
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// update initial properties & layout |
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this.reload(); |
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// events |
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this._windowResizeHandler = this.onWindowResize.bind( this ); |
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this._loadHandler = this.onLoad.bind( this ); |
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window.addEventListener( 'resize', this._windowResizeHandler ); |
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this.element.addEventListener( 'load', this._loadHandler, true ); |
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}; |
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|
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proto.errorCheck = function() { |
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var errors = []; |
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if ( !this.element ) { |
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errors.push( 'Bad element: ' + this.element ); |
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} |
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if ( !this.options.columns ) { |
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errors.push( 'columns option required: ' + this.options.columns ); |
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} |
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if ( !this.options.items ) { |
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errors.push( 'items option required: ' + this.options.items ); |
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} |
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|
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if ( errors.length ) { |
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throw new Error( '[Colcade error] ' + errors.join('. ') ); |
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} |
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}; |
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|
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// update properties and do layout |
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proto.reload = function() { |
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this.updateColumns(); |
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this.updateItems(); |
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this.layout(); |
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}; |
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|
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proto.updateColumns = function() { |
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this.columns = querySelect( this.options.columns, this.element ); |
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}; |
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|
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proto.updateItems = function() { |
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this.items = querySelect( this.options.items, this.element ); |
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}; |
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|
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proto.getActiveColumns = function() { |
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return this.columns.filter( function( column ) { |
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var style = getComputedStyle( column ); |
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return style.display != 'none'; |
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}); |
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}; |
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|
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// ----- layout ----- // |
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|
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// public, updates activeColumns |
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proto.layout = function() { |
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this.activeColumns = this.getActiveColumns(); |
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this._layout(); |
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}; |
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|
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// private, does not update activeColumns |
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proto._layout = function() { |
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// reset column heights |
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this.columnHeights = this.activeColumns.map( function() { |
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return 0; |
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}); |
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// layout all items |
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this.layoutItems( this.items ); |
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}; |
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|
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proto.layoutItems = function( items ) { |
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items.forEach( this.layoutItem, this ); |
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}; |
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|
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proto.layoutItem = function( item ) { |
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// layout item by appending to column |
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var minHeight = Math.min.apply( Math, this.columnHeights ); |
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var index = this.columnHeights.indexOf( minHeight ); |
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this.activeColumns[ index ].appendChild( item ); |
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// at least 1px, if item hasn't loaded |
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// Not exactly accurate, but it's cool |
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this.columnHeights[ index ] += item.offsetHeight || 1; |
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}; |
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|
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// ----- adding items ----- // |
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|
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proto.append = function( elems ) { |
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var items = this.getQueryItems( elems ); |
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// add items to collection |
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this.items = this.items.concat( items ); |
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// lay them out |
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this.layoutItems( items ); |
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}; |
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|
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proto.prepend = function( elems ) { |
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var items = this.getQueryItems( elems ); |
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// add items to collection |
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this.items = items.concat( this.items ); |
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// lay out everything |
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this._layout(); |
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}; |
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|
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proto.getQueryItems = function( elems ) { |
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elems = makeArray( elems ); |
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var fragment = document.createDocumentFragment(); |
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elems.forEach( function( elem ) { |
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fragment.appendChild( elem ); |
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}); |
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return querySelect( this.options.items, fragment ); |
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}; |
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|
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// ----- measure column height ----- // |
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|
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proto.measureColumnHeight = function( elem ) { |
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var boundingRect = this.element.getBoundingClientRect(); |
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this.activeColumns.forEach( function( column, i ) { |
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// if elem, measure only that column |
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// if no elem, measure all columns |
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if ( !elem || column.contains( elem ) ) { |
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var lastChildRect = column.lastElementChild.getBoundingClientRect(); |
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// not an exact calculation as it includes top border, and excludes item bottom margin |
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this.columnHeights[ i ] = lastChildRect.bottom - boundingRect.top; |
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} |
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}, this ); |
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}; |
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|
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// ----- events ----- // |
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|
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proto.onWindowResize = function() { |
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clearTimeout( this.resizeTimeout ); |
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this.resizeTimeout = setTimeout( function() { |
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this.onDebouncedResize(); |
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}.bind( this ), 100 ); |
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}; |
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|
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proto.onDebouncedResize = function() { |
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var activeColumns = this.getActiveColumns(); |
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// check if columns changed |
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var isSameLength = activeColumns.length == this.activeColumns.length; |
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var isSameColumns = true; |
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this.activeColumns.forEach( function( column, i ) { |
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isSameColumns = isSameColumns && column == activeColumns[i]; |
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}); |
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if ( isSameLength && isSameColumns ) { |
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return; |
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} |
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// activeColumns changed |
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this.activeColumns = activeColumns; |
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this._layout(); |
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}; |
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|
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proto.onLoad = function( event ) { |
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this.measureColumnHeight( event.target ); |
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}; |
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|
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// ----- destroy ----- // |
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|
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proto.destroy = function() { |
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// move items back to container |
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this.items.forEach( function( item ) { |
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this.element.appendChild( item ); |
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}, this ); |
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// remove events |
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window.removeEventListener( 'resize', this._windowResizeHandler ); |
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this.element.removeEventListener( 'load', this._loadHandler, true ); |
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// remove data |
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delete this.element.colcadeGUID; |
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delete instances[ this.guid ]; |
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}; |
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|
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// -------------------------- HTML init -------------------------- // |
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|
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docReady( function() { |
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var dataElems = querySelect('[data-colcade]'); |
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dataElems.forEach( htmlInit ); |
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}); |
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|
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function htmlInit( elem ) { |
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// convert attribute "foo: bar, qux: baz" into object |
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var attr = elem.getAttribute('data-colcade'); |
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var attrParts = attr.split(','); |
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var options = {}; |
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attrParts.forEach( function( part ) { |
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var pair = part.split(':'); |
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var key = pair[0].trim(); |
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var value = pair[1].trim(); |
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options[ key ] = value; |
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}); |
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|
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new Colcade( elem, options ); |
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} |
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|
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Colcade.data = function( elem ) { |
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elem = getQueryElement( elem ); |
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var id = elem && elem.colcadeGUID; |
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return id && instances[ id ]; |
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}; |
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|
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// -------------------------- jQuery -------------------------- // |
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|
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Colcade.makeJQueryPlugin = function( $ ) { |
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$ = $ || window.jQuery; |
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if ( !$ ) { |
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return; |
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} |
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|
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$.fn.colcade = function( arg0 /*, arg1 */) { |
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// method call $().colcade( 'method', { options } ) |
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if ( typeof arg0 == 'string' ) { |
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// shift arguments by 1 |
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var args = Array.prototype.slice.call( arguments, 1 ); |
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return methodCall( this, arg0, args ); |
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} |
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// just $().colcade({ options }) |
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plainCall( this, arg0 ); |
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return this; |
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}; |
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|
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function methodCall( $elems, methodName, args ) { |
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var returnValue; |
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$elems.each( function( i, elem ) { |
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// get instance |
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var colcade = $.data( elem, 'colcade' ); |
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if ( !colcade ) { |
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return; |
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} |
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// apply method, get return value |
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var value = colcade[ methodName ].apply( colcade, args ); |
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// set return value if value is returned, use only first value |
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returnValue = returnValue === undefined ? value : returnValue; |
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}); |
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return returnValue !== undefined ? returnValue : $elems; |
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} |
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|
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function plainCall( $elems, options ) { |
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$elems.each( function( i, elem ) { |
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var colcade = $.data( elem, 'colcade' ); |
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if ( colcade ) { |
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// set options & init |
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colcade.option( options ); |
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colcade.layout(); |
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} else { |
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// initialize new instance |
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colcade = new Colcade( elem, options ); |
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$.data( elem, 'colcade', colcade ); |
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} |
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}); |
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} |
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}; |
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|
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// try making plugin |
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Colcade.makeJQueryPlugin(); |
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|
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// -------------------------- utils -------------------------- // |
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|
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function extend( a, b ) { |
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for ( var prop in b ) { |
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a[ prop ] = b[ prop ]; |
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} |
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return a; |
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} |
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|
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// turn element or nodeList into an array |
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function makeArray( obj ) { |
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var ary = []; |
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if ( Array.isArray( obj ) ) { |
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// use object if already an array |
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ary = obj; |
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} else if ( obj && typeof obj.length == 'number' ) { |
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// convert nodeList to array |
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for ( var i=0; i < obj.length; i++ ) { |
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ary.push( obj[i] ); |
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} |
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} else { |
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// array of single index |
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ary.push( obj ); |
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} |
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return ary; |
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} |
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|
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// get array of elements |
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function querySelect( selector, elem ) { |
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elem = elem || document; |
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var elems = elem.querySelectorAll( selector ); |
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return makeArray( elems ); |
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} |
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|
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function getQueryElement( elem ) { |
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if ( typeof elem == 'string' ) { |
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elem = document.querySelector( elem ); |
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} |
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return elem; |
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} |
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|
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function docReady( onReady ) { |
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if ( document.readyState == 'complete' ) { |
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onReady(); |
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return; |
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} |
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document.addEventListener( 'DOMContentLoaded', onReady ); |
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} |
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|
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// -------------------------- end -------------------------- // |
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|
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return Colcade; |
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|
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})); |
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|
