I'm not a programmer (This is my hobby, but I like to learn new things). :)

I'm developing a JComponent on my side, and I need to integrate an Ajax Call in order to check something.

But I have this problem:

Here my code put in media/my_component/js

$(document).ready(function() {


  var codice_fiscale = $("#codice_fiscale").val();

//chiamata ajax

   //imposto il tipo di invio dati (GET O POST)
    type: "POST",

    //Dove devo inviare i dati recuperati dal form?
    url: 'index.php?option=com_doclf_jsajax&view=taskajaxes&task=checkcodicefiscale',

    //Quali dati devo inviare?
    data: "codice_fiscale=" + codice_fiscale,
    dataType: "html",

    //Inizio visualizzazione errori
    success: function(msg)
      $("#risultato").html(msg); // messaggio di avvenuta aggiunta valori al db (preso dal file risultato_aggiunta.php) potete impostare anche un alert("Aggiunto, grazie!");
    error: function()
      alert("Chiamata fallita, si prega di riprovare..."); //sempre meglio impostare una callback in caso di fallimento

Unfortunately, if I call it from

$doc = Factory::getDocument();
$doc->addScript(Uri::base() . '/media/com_doclf_users/js/codice_fiscale.js');

I receive a error on debug

ncaught TypeError: $ is not a function
at codice_fiscale.js:1

Instead, if I put it into a default.php inside the script tag (like <script> my script </script>) it works.

Can anybody explain to me why?

Thanks in advance.


  • Try replacing $(document).ready(function() { with jQuery(document).ready(function($) {
    – Lodder
    May 19 '20 at 11:06
  • @Lodder Thanks! Works, perfectly! :) Another question: this is a correct way to do this or not? I'm trying to understand how is the best way to do things in joomla. May 19 '20 at 12:03
  • Glad it worked. I've added a proper answer below
    – Lodder
    May 19 '20 at 12:35

You'd be best off using the jQuery global scope and passing $ as an alias inside the function instead:

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

This helps prevent any conflicts with other 3rd party libraries that also use the $ namespace.


The addScript method will be adding the <script> tag for your JS before jQuery. You can solve this easily by adding JHtml::_('jquery.framework'); before your addScript. Still, probably safer to use the jQuery global and $ as an alias within your function.

  • Thanks. I have implemented also with this. Any tip is appreciate May 19 '20 at 23:26
  • So you still have the same errors, even after instantiating the jquery framework before your addScript? This injects the necessary <script> calls for the jquery libraries before your <script>, so the jQuery errors should be subdued.
    – Grant G
    May 20 '20 at 0:11
  • No no it works!!! Thanks ! ;) May 20 '20 at 0:27

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