WooCommerce Name Your Price - disable input

wc-nyp-disable-input.js

jQuery(document).ready(function($) {

  //re-assign the error message variable - keep the minimum acceptable price concealed
  if ( 'undefined' != typeof woocommerce_nyp_params ) {
    woocommerce_nyp_params.minimum_error = 'Offer rejected';
  }
  //initially disable the price input
  $('input#nyp').prop('disabled', true)
  // WooCommerce outputs the product id in a hidden element within the add to cart form.
  var productId = $('input[name="add-to-cart"]').val()
  //need to use 'numeral' to account for prices with decimals - parseFloat hasn't got very wide browser support
  var originalPrice = numeral( $('div.nyp').data('price') ).format('0.00')
  var newPrice = originalPrice;//two values will be compared later, make them equal for now
  //if there is a cookie set for this product, its name is 'haggledon-' plus the product id. Uses the cookie jQuery extension
  var cookie = $.cookie('haggledon-' + productId)
  if (cookie == null) {//there's no cookie, is there a transient?
    // WooCommerce sets the admin-ajax url, so just borrow that
    $.post(wc_add_to_cart_params.ajax_url, {
      //In a php file, there's a call to add_action( wp_ajax_nopriv_haggle_transient. The action paramater
      //is how admin-ajax knows how to route this call
      action: 'haggle_transient',
      pid: productId
    }, function(data) {
      if (!data.success) {
        $('input#nyp').prop('disabled', false)//no cookie, no transient, ok to enable
      }//if there was a transient, the input remains disabled
    })
  }//if there was a cookie, the input remains disabled

  $('input#nyp').on('blur', function() {//bind a listner to the 'blur' event
    //get the value that was input
    newPrice = numeral($('input#nyp').val()).format('0.00')
    if (newPrice < originalPrice) {//the price someone offered to pay is less than the suggested price
      $('input#nyp').prop('disabled', true)//disable the input
        //set a transient
      $.post(wc_add_to_cart_params.ajax_url, {
        action: 'haggle_transient',
        pid: productId,
        set: true//passing a third paramater to the AJAX handler this time - tell it to set a transient
      })
      if (null == cookie) {//set a cookie
        $.cookie('haggledon-' + productId, 'true', {expires:1})
      }
    }
  })
  //enable the input on submit or things will fail
  $('form.cart').on('submit', function() {
    $('input#nyp').prop('disabled', false)
  })
})