uncaught typeerror e.indexof is not a function jquery 3.5.1 code example

Example: uncaught typeerror e.indexof is not a function jquery load

This error might be caused by the jQuery event-aliases like .load(), .unload() or .error() that all are deprecated since jQuery 1.8. Lookup for these aliases in your code and replace them with the .on() method instead. For example, replace the following deprecated excerpt: