未捕获的TypeError:无法读取null的属性"on" [英] Uncaught TypeError: Cannot read property 'on' of null

问题描述

我收到了这个Uncaught TypeError:

I'm getting this Uncaught TypeError:

我不确定是什么原因造成的，也许与JQuery有关?

I'm unsure what is causing it, maybes something to do with JQuery?

这是确切的代码:

//when add to cart link is clicked...
$('.addtocart').on('click', function(){

  //get the value of the "data-value" attribute for that link
  var vehicleRegistration = $(this).data('value');
  //save it to localStorage
  localStorage.setItem('vehicleRegistration', vehicleRegistration);


  //read from localStorage
  if( localStorage.getItem('vehicleRegistration') ){
    //add the value to the form input
    $('#field34').val( localStorage.getItem('vehicleRegistration') );
  }

});

这是它发生在的页面: http://drivencarsales.co.uk/book -testdrive

Here is the page that it is happening on: http://drivencarsales.co.uk/book-testdrive

这真的让我感到难过，如果有人可以帮助我解决这个问题，将不胜感激.

It's really got me stumped, if anyone can help me solve this it would be much appreciated.

谢谢尼克

推荐答案

在您的站点中，您同时添加了prototype.js和jQuery.此处的$调用prototype.js而不是jQuery.因此，请将该代码更改为:

In your site, you have both prototype.js and jQuery added. The $ here calls prototype.js instead of jQuery. So instead of that code, please change it to:

jQuery('.addtocart').on('click', function(){

  //get the value of the "data-value" attribute for that link
  var vehicleRegistration = jQuery(this).data('value');
  //save it to localStorage
  localStorage.setItem('vehicleRegistration', vehicleRegistration);


  //read from localStorage
  if( localStorage.getItem('vehicleRegistration') ){
    //add the value to the form input
    jQuery('#field34').val( localStorage.getItem('vehicleRegistration') );
  }

});

或者您也可以这样做:

(function ($) {
    $('.addtocart').on('click', function(){

      //get the value of the "data-value" attribute for that link
      var vehicleRegistration = $(this).data('value');
      //save it to localStorage
      localStorage.setItem('vehicleRegistration', vehicleRegistration);


      //read from localStorage
      if( localStorage.getItem('vehicleRegistration') ){
        //add the value to the form input
        $('#field34').val( localStorage.getItem('vehicleRegistration') );
      }

    });
})(jQuery);

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