swatch-renderer.js

_RenderControls: function () {
    var $widget = this,
        container = this.element,
        classes = this.options.classes,
        chooseText = this.options.jsonConfig.chooseText;

    $widget.optionsMap = {};

    $.each(this.options.jsonConfig.attributes, function () {
        var item = this,
            controlLabelId = 'option-label-' + item.code + '-' + item.id,
            options = $widget._RenderSwatchOptions(item, controlLabelId),
            select = $widget._RenderSwatchSelect(item, chooseText),
            input = $widget._RenderFormInput(item),
            listLabel = '',
            label = '';

        // Show only swatch controls
        if ($widget.options.onlySwatches && !$widget.options.jsonSwatchConfig.hasOwnProperty(item.id)) {
            return;
        }

        if ($widget.options.enableControlLabel) {
            label +=
                '<span id="' + controlLabelId + '" class="' + classes.attributeLabelClass + '">' +
                $('<i></i>').text(item.label).html() +
                '</span>' +
                '<span class="' + classes.attributeSelectedOptionLabelClass + '"></span>';
        }

        if ($widget.inProductList) {
            $widget.productForm.append(input);
            input = '';
            listLabel = 'aria-label="' + $('<i></i>').text(item.label).html() + '"';
        } else {
            listLabel = 'aria-labelledby="' + controlLabelId + '"';
        }

        // Create new control
        container.append(
            '<div class="' + classes.attributeClass + ' ' + item.code + '" ' +
                 'attribute-code="' + item.code + '" ' +
                 'attribute-id="' + item.id + '">' +
                label +
                '<div aria-activedescendant="" ' +
                     'tabindex="0" ' +
                     'aria-invalid="false" ' +
                     'aria-required="true" ' +
                     'role="listbox" ' + listLabel +
                     'class="' + classes.attributeOptionsWrapper + ' clearfix">' +
                    options + select +
                '</div>' + input +
            '</div>'
        );

        $widget.optionsMap[item.id] = {};

        // Aggregate options array to hash (key => value)
        $.each(item.options, function () {
            if (this.products.length > 0) {
                $widget.optionsMap[item.id][this.id] = {
                    price: parseInt(
                        $widget.options.jsonConfig.optionPrices[this.products[0]].finalPrice.amount,
                        10
                    ),
                    products: this.products
                };
            }
        });
    });

    // Connect Tooltip
    container
        .find('[option-type="1"], [option-type="2"], [option-type="0"], [option-type="3"]')
        .SwatchRendererTooltip();

    // Hide all elements below more button
    $('.' + classes.moreButton).nextAll().hide();

    // Handle events like click or change
    $widget._EventListener();

    // Rewind options
    $widget._Rewind(container);

    //Emulate click on all swatches from Request
    $widget._EmulateSelected($.parseQuery());
    $widget._EmulateSelected($widget._getSelectedAttributes());

    //
    // New part for selecting first swatch by default
    //
    if(this._determineProductData().isInProductView){
        var gallery = $('[data-gallery-role=gallery-placeholder]', '.column.main');
        gallery.data('gallery') ?
            this._OnClick($(container.find('.swatch-option').get(0)), $widget) :
            gallery.on('gallery:loaded', this._OnClick($(container.find('.swatch-option').get(0)), $widget));
    }
},