swatch-callback.js

// BEGIN SWATCHES
 if (variant) {
    var form = jQuery('#' + selector.domIdPrefix).closest('form');
    for (var i=0,length=variant.options.length; i<length; i++) {
      var radioButton = form.find('.swatch[data-option-index="' + i + '"] :radio[value="' + variant.options[i] +'"]');
      if (radioButton.size()) {
        radioButton.get(0).checked = true;
      }
    }
  }
 
  var selectedColour = jQuery('.colour input:checked').parent().attr('data-value');
 
  if (selectedColour.length > 0) {
    var variants = selector.product.variants;
    var variantTitles = [];
    var i;
 
  for (i = 0; i < variants.length; i++) {
    variantTitles.push(variants[i].title);   
  }
 
  jQuery('.size').each( function() {
    var variantTitle = selectedColour + " / " + jQuery(this).attr('data-value');
 
    var variantIndex = jQuery.inArray(variantTitle, variantTitles);
 
    if (variantIndex != -1 && variants[variantIndex].available == true) {
 
      jQuery(this).eq(0).removeClass('unavailable');
    }
  
    else {
      jQuery(this).eq(0).addClass('unavailable');
    }
  });
}
// END SWATCHES