I have a problem with saving the T3 Framework megamenu

In practice, after setting the megamenu and clicking on save, it does not save.

Inspecting I found some JS errors that I can't solve, the errors are:

megamenu.js: 463 Uncaught TypeError: Cannot set property 'undefined' of undefined
     at Object.actions.saveConfig (megamenu.js: 463)
     at HTMLButtonElement. <anonymous> (megamenu.js: 71)
     at HTMLButtonElement.dispatch (jquery-1.8.3.min.js: 2)
     at HTMLButtonElement.u (jquery-1.8.3.min.js: 2)
     at Object.trigger (jquery-1.8.3.min.js: 2)
     at HTMLButtonElement. <anonymous> (jquery-1.8.3.min.js: 2)
     at Function.each (jquery-1.8.3.min.js: 2)
     at init.each (jquery-1.8.3.min.js: 2)
     at init.trigger (jquery-1.8.3.min.js: 2)
     at HTMLButtonElement. <anonymous> (megamenu.js: 983)

I need help to solve it.

Update: the two line js of megamenu

Line 463 (from 456 to 477)

var menutype = $('#jform_params_mm_type').val(),
    curconfig = T3AdminMegamenu.config;

if($.isArray(curconfig) && curconfig.length == 0){
    curconfig = {};

**curconfig[menutype] = config;**

    url: T3AdminMegamenu.referer,
    type: 'post',
    data: {
        t3action: 'megamenu',
        t3task: 'save',
        styleid: T3AdminMegamenu.styleid,
        template: T3AdminMegamenu.template,

        mmkey: $('#megamenu-key').val(),
        config: JSON.stringify(config),
        rand: Math.random()

Line 71 (from 65 to 75)

// bind event for action
        $('.toolbox-action').click (function(event) {
            var action = $(this).data ('action');

            if (action) {
                actions.datas = $(this).data();
                **actions[action] ();**
            return false;
  • For volunteers who do not have megamenu in their own project to reference, are you able to show the relevant lines of code associated with this error? Mar 27, 2021 at 21:43
  • @mickmackusa hi, I update the post with the two relevant lines between ** ** in code. Thanks
    – Joso
    Mar 27, 2021 at 22:00
  • I use T3 rather extensively and haven't come across this in any Joomla 3.x version. What version of Joomla are you using? Have you overridden any of the t3 core?
    – Grant G
    Mar 29, 2021 at 10:28
  • Hi Grant, I contacted a freelance to solve the issue, and now it works... He changed something in megamenu.tlp.php file.
    – Joso
    Mar 29, 2021 at 10:34


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