// Utility JavaScript functions

/** 
 * Run as onSubmit="return hasItemAddToBasket(this);"
 * Note: will return true as default if:
 *       - thisform param is not a form object
 *       - no input named add_basket_item(s) (ie. name of Add to Basket button)
 */
function hasItemAddToBasket(thisform) {
  if ( thisform != null && thisform.elements != null && typeof(thisform.elements) != "undefined" ) {
    var has_item = false;
    var add_to_basket_button = false;
    var bname_regex = new RegExp();
    bname_regex.compile("^add_basket_item");
    var iname_regex = new RegExp();
    iname_regex.compile("^(purchase_option_id|combo_deal_id)");
    for ( i = 0; i < thisform.elements.length; i++ ) {
      var element = thisform.elements[i];
      if ( bname_regex.exec(element.name) ) {
        add_to_basket_button = true;
      } // match button name
      if ( iname_regex.exec(element.name) ) {
        if ( element.checked ) {
          has_item = true;
          if ( add_to_basket_button ) {
            break;
          }
        }
      } // match input name
    } // for each form element
    if ( add_to_basket_button && ! has_item ) {
      alert("Trying to add an item to the basket?\n\nClick round button to left of product option, then click 'Add to Basket'.");
      return has_item;
    }
  }

  return true;
}