isotope/js/isotope.js

/*!
 * Isotope v2.0.0-beta.1
 * Magical sorting and filtering layouts
 * http://isotope.metafizzy.co
 */

( function( window ) {

'use strict';

// -------------------------- vars -------------------------- //

var jQuery = window.jQuery;

// -------------------------- helpers -------------------------- //

// extend objects
function extend( a, b ) {
  for ( var prop in b ) {
    a[ prop ] = b[ prop ];
  }
  return a;
}

var trim = String.prototype.trim ?
  function( str ) {
    return str.trim();
  } :
  function( str ) {
    return str.replace( /^\s+|\s+$/g, '' );
  };

var docElem = document.documentElement;

var getText = docElem.textContent ?
  function( elem ) {
    return elem.textContent;
  } :
  function( elem ) {
    return elem.innerText;
  };

// -------------------------- isotopeDefinition -------------------------- //

// used for AMD definition and requires
function isotopeDefinition( Outlayer, getSize, matchesSelector, Item, LayoutMode ) {
  // create an Outlayer layout class
  var Isotope = Outlayer.create( 'isotope', {
    sortAscending: true
  });

  Isotope.Item = Isotope.prototype.settings.item = Item;
  Isotope.LayoutMode = LayoutMode;

  Isotope.prototype._create = function() {
    this.itemGUID = 0;
    // call super
    Outlayer.prototype._create.call( this );

    // create layout modes
    this.modes = {};
    // create from registered layout modes
    for ( var name in LayoutMode.modes ) {
      this._initLayoutMode( name );
    }
    // start filteredItems with all items
    this.filteredItems = this.items;

    // functions that sort items
    this._sorters = {};
    // keep of track of sortBys
    this.sortHistory = [ 'original-order' ];
    this.updateSortData();
  };

  Isotope.prototype.reloadItems = function() {
    // reset item ID counter
    this.itemGUID = 0;
    // call super
    Outlayer.prototype.reloadItems.call( this );
  };

  Isotope.prototype._itemize = function() {
    var items = Outlayer.prototype._itemize.apply( this, arguments );
    // assign ID for original-order
    for ( var i=0, len = items.length; i < len; i++ ) {
      var item = items[i];
      item.id = this.itemGUID++;
    }
    return items;
  };

  // -------------------------- layout -------------------------- //

  Isotope.prototype._initLayoutMode = function( name ) {
    var Mode = LayoutMode.modes[ name ];
    // set mode options
    // HACK extend initial options, back-fill in default options
    var initialOpts = this.options[ name ] || {};
    this.options[ name ] = Mode.options ?
      extend( Mode.options, initialOpts ) : initialOpts;
    // init layout mode instance
    this.modes[ name ] = new Mode( this );
  };

  Isotope.prototype.layout = function( opts ) {
    // set any options pass
    this.option( opts );
    // don't animate first layout
    var isInstant = this._isInitInstant = this.options.isLayoutInstant !== undefined ?
      this.options.isLayoutInstant : !this._isLayoutInited;
      //
    this.filteredItems = this._filter( this.items );
    this._sort();
    // layout flow
    this._resetLayout();
    this._manageStamps();
    this.layoutItems( this.filteredItems, isInstant );

    // flag for initalized
    this._isLayoutInited = true;
  };


  // -------------------------- filter -------------------------- //

  Isotope.prototype._filter = function( items ) {
    var filter = this.options.filter;
    filter = filter || '*';
    var matches = [];
    var hiddenMatched = [];
    var visibleUnmatched = [];

    var test = this._getFilterTest( filter );

    // test each item
    for ( var i=0, len = items.length; i < len; i++ ) {
      var item = items[i];
      if ( item.isIgnored ) {
        continue;
      }
      // add item to either matched or unmatched group
      var isMatched = test( item );
      // item.isFilterMatched = isMatched;
      // add to matches if its a match
      if ( isMatched ) {
        matches.push( item );
      }
      // add to additional group if item needs to be hidden or revealed
      if ( isMatched && item.isHidden ) {
        hiddenMatched.push( item );
      } else if ( !isMatched && !item.isHidden ) {
        visibleUnmatched.push( item );
      }
    }

    // HACK
    // disable transition on init
    var _transitionDuration = this.options.transitionDuration;
    if ( this._isInitInstant ) {
      this.options.transitionDuration = 0;
    }
    this.reveal( hiddenMatched );
    this.hide( visibleUnmatched );
    // set back
    if ( this._isInitInstant ) {
      this.options.transitionDuration = _transitionDuration;
    }

    return matches;
  };

  // get a jQuery, function, or a matchesSelector test given the filter
  Isotope.prototype._getFilterTest = function( filter ) {
    var test;
    if ( jQuery && this.options.isJQueryFiltering ) {
      test = function( item ) {
        return jQuery( item.element ).is( filter );
      };
    } else if ( typeof filter === 'function' ) {
      test = function( item ) {
        return filter( item.element );
      };
    } else {
      test = function( item ) {
        return matchesSelector( item.element, filter );
      };
    }
    return test;
  };

  // -------------------------- sorting -------------------------- //

  Isotope.prototype.updateSortData = function( items ) {
    // update sorters
    var getSortData = this.options.getSortData;
    for ( var key in getSortData ) {
      var sorter = getSortData[ key ];
      this._sorters[ key ] = mungeSorter( sorter );
    }
    // update item sort data
    // default to all items if none are passed in
    items = items || this.items;
    for ( var i=0, len = items.length; i < len; i++ ) {
      var item = items[i];
      if ( item.isIgnored ) {
        continue;
      }
      item.updateSortData();
    }
  };

  // ----- munge sorter ----- //

  // encapsulate this, as we just need mungeSorter
  // other functions in here are just for munging
  var mungeSorter = ( function() {
    // add a magic layer to sorters for convienent shorthands
    // `.foo-bar` will use the text of .foo-bar querySelector
    // `[foo-bar]` will use attribute
    // you can also add parser
    // `.foo-bar parseInt` will parse that as a number
    function mungeSorter( sorter ) {
      // if not a string, return function or whatever it is
      if ( typeof sorter !== 'string' ) {
        return sorter;
      }
      // parse the sorter string
      var args = trim( sorter ).split(' ');
      var query = args[0];
      // check if query looks like [an-attribute]
      var attrMatch = query.match( /^\[(.+)\]$/ );
      var attr = attrMatch && attrMatch[1];
      var getValue = getValueGetter( attr, query );
      // use second argument as a parser
      var parser = getParser( args[1] );
      // parse the value, if there was a parser
      sorter = parser ? function( elem ) {
        return elem && parser( getValue( elem ) );
      } :
      // otherwise just return value
      function( elem ) {
        return elem && getValue( elem );
      };

      return sorter;
    }

    // get an attribute getter, or get text of the querySelector
    function getValueGetter( attr, query ) {
      var getValue;
      // if query looks like [foo-bar], get attribute
      if ( attr ) {
        getValue = function( elem ) {
          return elem.getAttribute( attr );
        };
      } else {
        // otherwise, assume its a querySelector, and get its text
        getValue = function( elem ) {
          var child = elem.querySelector( query );
          return child && getText( child );
        };
      }
      return getValue;
    }

    // return a parser function if arg matches
    function getParser( arg ) {
      var parser;
      switch ( arg ) {
        case 'parseInt' :
          parser = function( val ) {
            return parseInt( val, 10 );
          };
          break;
        case 'parseFloat' :
          parser = function( val ) {
            return parseFloat( val );
          };
          break;
        default :
          // just return val if parser isn't one of these
          // TODO - console log that that parser doesn't exist
          parser = function( val ) {
            return val;
          };
      }
      return parser;
    }

    return mungeSorter;
  })();


  // ----- sort method ----- //

  // sort filteredItem order
  Isotope.prototype._sort = function() {
    var sortByOpt = this.options.sortBy;
    if ( !sortByOpt ) {
      return;
    }
    // concat all sortBy and sortHistory
    var sortBys = [].concat.apply( sortByOpt, this.sortHistory );
    // sort magic
    var itemSorter = getItemSorter( sortBys, this.options.sortAscending );
    this.filteredItems.sort( itemSorter );
    // keep track of sortBy History
    if ( sortByOpt !== this.sortHistory[0] ) {
      // add to front, oldest goes in last
      this.sortHistory.unshift( sortByOpt );
    }
  };

  // returns a function used for sorting
  function getItemSorter( sortBys, sortAsc ) {
    return function sorter( itemA, itemB ) {
      // cycle through all sortKeys
      for ( var i = 0, len = sortBys.length; i < len; i++ ) {
        var sortBy = sortBys[i];
        var a = itemA.sortData[ sortBy ];
        var b = itemB.sortData[ sortBy ];
        if ( a > b || a < b ) {
          // if sortAsc is an object, use the value given the sortBy key
          var isAscending = sortAsc[ sortBy ] !== undefined ? sortAsc[ sortBy ] : sortAsc;
          var direction = isAscending ? 1 : -1;
          return ( a > b ? 1 : -1 ) * direction;
        }
      }
      return 0;
    };
  }

  // -------------------------- methods -------------------------- //

  // get layout mode
  Isotope.prototype._mode = function() {
    var layoutMode = this.options.layoutMode;
    var mode = this.modes[ layoutMode ];
    if ( !mode ) {
      // TODO console.error
      throw new Error( 'No layout mode: ' + layoutMode );
    }
    // HACK sync mode's options
    // any options set after init for layout mode need to be synced
    mode.options = this.options[ layoutMode ];
    return mode;
  };

  Isotope.prototype._resetLayout = function() {
    // trigger original reset layout
    Outlayer.prototype._resetLayout.call( this );
    this._mode()._resetLayout();
  };

  Isotope.prototype._getItemLayoutPosition = function( item  ) {
    return this._mode()._getItemLayoutPosition( item );
  };

  Isotope.prototype._manageStamp = function( stamp ) {
    var mode = this._mode();
    // HACK copy over some options
    mode.options.isOriginLeft = this.options.isOriginLeft;
    mode.options.isOriginTop = this.options.isOriginTop;
    mode._manageStamp( stamp );
  };

  Isotope.prototype._getContainerSize = function() {
    return this._mode()._getContainerSize();
  };

  Isotope.prototype.resize = function() {
    this._mode().resize();
  };

  return Isotope;
}

// -------------------------- transport -------------------------- //

if ( typeof define === 'function' && define.amd ) {
  // AMD
  define( [
      'outlayer/outlayer',
      'get-size/get-size',
      'matches-selector/matches-selector',
      './item.js',
      './layout-modes.js'
    ],
    isotopeDefinition );
} else {
  // browser global
  window.Isotope = isotopeDefinition(
    window.Outlayer,
    window.getSize,
    window.matchesSelector,
    window.Isotope.Item,
    window.Isotope.LayoutMode
  );
}

})( window );