Slideshow no longer displays after Core Update

Hi @verhoevc, I've tested a slideshow on homepage in the Drupal 8.4.2 and 8.4.3, I don't have any problems.
Can you provide more details please. Did you look at developer console?

I am having the same issue on version 8.x-1.7 of the theme, and I believe this is related to the jQuery version change from 8.3->8.4. In my production site (8.3.x), the slideshow works properly with jQuery2, but my development site broke upon updating to 8.4.x and jQuery3.

There is an uncaught typeError "a.indexOf is not a function" that triggers on:

// Can also be used with $(document).ready()
jQuery(window).load(function() {
    jQuery('.flexslider').flexslider({
        animation: "slide"
    });
});

This code needs to use the .on('load',...) method to work in jQuery3.

I have the same problem :-(
Theme Business 8.x-1.7 (
Drupal 8.4.5

Yes, there is an issue with the jquery code.

As kncrabtree suggested need to replace the code of custom.js with following.

jQuery(window).on("load",function(e) {
  jQuery('.flexslider').flexslider({
    animation: "slide"
  });
});

This will resolve the issue.

Thanks,
Ankit

(delete this)

Please patch your code. It's 1 line to fix slider under 8.x.x.
The problem is you are trying to use a deprecated load from newer jquery. Console will tell you it cannot load them as-is:

jquery.min.js?v=3.2.1:4 Uncaught TypeError: a.indexOf is not a function
    at r.fn.init.r.fn.load (jquery.min.js?v=3.2.1:4)
    at custom.js?v=8.6.5:2

Same problem with Drupal 8.6.15, the suggested fix works well.

Yes, the above suggestion works good for me.

I agree that the patch worked for me as well. Kindly update the package.

This patch doesn't work anymore

 gauravmahlawat@Gauravs-Air business % git apply -v custom.js__0.patch
custom.js__0.patch:4: trailing whitespace.
// Can also be used with $(document).ready()
Checking patch custom.js   2019-01-13 19:00:21.788887336 +0000...
error: custom.js   2019-01-13 19:00:21.788887336 +0000: No such file or directory

The patch needs to be created from the directory containing the module. From that directory, the custom.js file is in js/custom.js.

Furthermore, the content of the custom.js file is the following.

// Can also be used with $(document).ready()
jQuery(window).on('load', function() {
  jQuery('.flexslider').flexslider({
    animation: "slide"
  });
});

The code has been fixed in commit 84cdd33, as result of #2920983: Slideshow disappeared out of nowhere, created on November 4, 2017. This issue is a duplicate of that issue.