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✏️ Editing: colcade.js

/*!
 * Colcade v0.2.0
 * Lightweight masonry layout
 * by David DeSandro
 * MIT license
 */

/*jshint browser: true, undef: true, unused: true */

( function( window, factory ) {
  // universal module definition
  /*jshint strict: false */
  /*global define: false, module: false */
  if ( typeof define == 'function' && define.amd ) {
    // AMD
    define( factory );
  } else if ( typeof module == 'object' && module.exports ) {
    // CommonJS
    module.exports = factory();
  } else {
    // browser global
    window.Colcade = factory();
  }

}( window, function factory() {

// -------------------------- Colcade -------------------------- //

function Colcade( element, options ) {
  element = getQueryElement( element );

// do not initialize twice on same element
  if ( element && element.colcadeGUID ) {
    var instance = instances[ element.colcadeGUID ];
    instance.option( options );
    return instance;
  }

this.element = element;
  // options
  this.options = {};
  this.option( options );
  // kick things off
  this.create();
}

var proto = Colcade.prototype;

proto.option = function( options ) {
  this.options = extend( this.options, options );
};

// globally unique identifiers
var GUID = 0;
// internal store of all Colcade intances
var instances = {};

proto.create = function() {
  this.errorCheck();
  // add guid for Colcade.data
  var guid = this.guid = ++GUID;
  this.element.colcadeGUID = guid;
  instances[ guid ] = this; // associate via id
  // update initial properties & layout
  this.reload();
  // events
  this._windowResizeHandler = this.onWindowResize.bind( this );
  this._loadHandler = this.onLoad.bind( this );
  window.addEventListener( 'resize', this._windowResizeHandler );
  this.element.addEventListener( 'load', this._loadHandler, true );
};

proto.errorCheck = function() {
  var errors = [];
  if ( !this.element ) {
    errors.push( 'Bad element: ' + this.element );
  }
  if ( !this.options.columns ) {
    errors.push( 'columns option required: ' + this.options.columns );
  }
  if ( !this.options.items ) {
    errors.push( 'items option required: ' + this.options.items );
  }

if ( errors.length ) {
    throw new Error( '[Colcade error] ' + errors.join('. ') );
  }
};

// update properties and do layout
proto.reload = function() {
  this.updateColumns();
  this.updateItems();
  this.layout();
};

proto.updateColumns = function() {
  this.columns = querySelect( this.options.columns, this.element );
};

proto.updateItems = function() {
  this.items = querySelect( this.options.items, this.element );
};

proto.getActiveColumns = function() {
  return this.columns.filter( function( column ) {
    var style = getComputedStyle( column );
    return style.display != 'none';
  });
};

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

// public, updates activeColumns
proto.layout = function() {
  this.activeColumns = this.getActiveColumns();
  this._layout();
};

// private, does not update activeColumns
proto._layout = function() {
  // reset column heights
  this.columnHeights = this.activeColumns.map( function() {
    return 0;
  });
  // layout all items
  this.layoutItems( this.items );
};

proto.layoutItems = function( items ) {
  items.forEach( this.layoutItem, this );
};

proto.layoutItem = function( item ) {
  // layout item by appending to column
  var minHeight = Math.min.apply( Math, this.columnHeights );
  var index = this.columnHeights.indexOf( minHeight );
  this.activeColumns[ index ].appendChild( item );
  // at least 1px, if item hasn't loaded
  // Not exactly accurate, but it's cool
  this.columnHeights[ index ] += item.offsetHeight || 1;
};

// ----- adding items ----- //

proto.append = function( elems ) {
  var items = this.getQueryItems( elems );
  // add items to collection
  this.items = this.items.concat( items );
  // lay them out
  this.layoutItems( items );
};

proto.prepend = function( elems ) {
  var items = this.getQueryItems( elems );
  // add items to collection
  this.items = items.concat( this.items );
  // lay out everything
  this._layout();
};

proto.getQueryItems = function( elems ) {
  elems = makeArray( elems );
  var fragment = document.createDocumentFragment();
  elems.forEach( function( elem ) {
    fragment.appendChild( elem );
  });
  return querySelect( this.options.items, fragment );
};

// ----- measure column height ----- //

proto.measureColumnHeight = function( elem ) {
  var boundingRect = this.element.getBoundingClientRect();
  this.activeColumns.forEach( function( column, i ) {
    // if elem, measure only that column
    // if no elem, measure all columns
    if ( !elem || column.contains( elem ) ) {
      var lastChildRect = column.lastElementChild.getBoundingClientRect();
      // not an exact calculation as it includes top border, and excludes item bottom margin
      this.columnHeights[ i ] = lastChildRect.bottom - boundingRect.top;
    }
  }, this );
};

// ----- events ----- //

proto.onWindowResize = function() {
  clearTimeout( this.resizeTimeout );
  this.resizeTimeout = setTimeout( function() {
    this.onDebouncedResize();
  }.bind( this ), 100 );
};

proto.onDebouncedResize = function() {
  var activeColumns = this.getActiveColumns();
  // check if columns changed
  var isSameLength = activeColumns.length == this.activeColumns.length;
  var isSameColumns = true;
  this.activeColumns.forEach( function( column, i ) {
    isSameColumns = isSameColumns && column == activeColumns[i];
  });
  if ( isSameLength && isSameColumns ) {
    return;
  }
  // activeColumns changed
  this.activeColumns = activeColumns;
  this._layout();
};

proto.onLoad = function( event ) {
  this.measureColumnHeight( event.target );
};

// ----- destroy ----- //

proto.destroy = function() {
  // move items back to container
  this.items.forEach( function( item ) {
    this.element.appendChild( item );
  }, this );
  // remove events
  window.removeEventListener( 'resize', this._windowResizeHandler );
  this.element.removeEventListener( 'load', this._loadHandler, true );
  // remove data
  delete this.element.colcadeGUID;
  delete instances[ this.guid ];
};

// -------------------------- HTML init -------------------------- //

docReady( function() {
  var dataElems = querySelect('[data-colcade]');
  dataElems.forEach( htmlInit );
});

function htmlInit( elem ) {
  // convert attribute "foo: bar, qux: baz" into object
  var attr = elem.getAttribute('data-colcade');
  var attrParts = attr.split(',');
  var options = {};
  attrParts.forEach( function( part ) {
    var pair = part.split(':');
    var key = pair[0].trim();
    var value = pair[1].trim();
    options[ key ] = value;
  });

new Colcade( elem, options );
}

Colcade.data = function( elem ) {
  elem = getQueryElement( elem );
  var id = elem && elem.colcadeGUID;
  return id && instances[ id ];
};

// -------------------------- jQuery -------------------------- //

Colcade.makeJQueryPlugin = function( $ ) {
  $ = $ || window.jQuery;
  if ( !$ ) {
    return;
  }

$.fn.colcade = function( arg0 /*, arg1 */) {
    // method call $().colcade( 'method', { options } )
    if ( typeof arg0 == 'string' ) {
      // shift arguments by 1
      var args = Array.prototype.slice.call( arguments, 1 );
      return methodCall( this, arg0, args );
    }
    // just $().colcade({ options })
    plainCall( this, arg0 );
    return this;
  };

// try making plugin
Colcade.makeJQueryPlugin();

// -------------------------- utils -------------------------- //

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

// turn element or nodeList into an array
function makeArray( obj ) {
  var ary = [];
  if ( Array.isArray( obj ) ) {
    // use object if already an array
    ary = obj;
  } else if ( obj && typeof obj.length == 'number' ) {
    // convert nodeList to array
    for ( var i=0; i < obj.length; i++ ) {
      ary.push( obj[i] );
    }
  } else {
    // array of single index
    ary.push( obj );
  }
  return ary;
}

// get array of elements
function querySelect( selector, elem ) {
  elem = elem || document;
  var elems = elem.querySelectorAll( selector );
  return makeArray( elems );
}

function getQueryElement( elem ) {
  if ( typeof elem == 'string' ) {
    elem = document.querySelector( elem );
  }
  return elem;
}

function docReady( onReady ) {
  if ( document.readyState == 'complete' ) {
    onReady();
    return;
  }
  document.addEventListener( 'DOMContentLoaded', onReady );
}

// -------------------------- end -------------------------- //

return Colcade;

}));

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