WordPress jQuery UI tabs is not a function

When working with jQuery UI you get an error message:

Uncaught TypeError: jQuery(...).tabs is not a function(…)

This is because WordPress' function
wp_enqueue_script( 'jquery-ui' );
doesn't actually enqueue the tabs widget, only the core of jQuery UI.

So after that you need to add:
wp_enqueue_script( 'jquery-ui-tabs' );

See this link below for more info:

Default Scripts Included and Registered by WordPress
https://developer.wordpress.org/reference/functions/wp_enqueue_script/

Wordpress update - old jQuery warnings

With the recent Wordpress update, jQuery was also updated to version 1.10.

Blogs were now full of warning messages, somewhere along the lines of:

ATTENTION! (by Comprehensive Google Map Plugin)
Your blog/site theme or one of your plugins uses jQuery javascript library which is older than the version 1.3.0.
The Comprehensive Google Map plugin will not work with such outdated jQuery version.
The minimum jQuery requirement for Comprehensive Google Map plugin is version 1.3.0. Apologies for the inconvenience..

However, this is not true. Version 1.10.2 is greater than 1.3, but somehow it get's detected as 1.1, because silly programmers cast the version code into float. Ugh.

if (version < 1.3) { // WTF ?!?!?!?!?!
    alert(CGMPGlobal.errors.oldJquery);
    return false;
}

Unfortunately, there's not much we can do about it, other than a quick hack of removing the version check or modifying it to 1.1.

Or wait for the plugin developers to FIX THE DAMN CODE.

Like that will happen anytime soon.

jQuery - update DIV's HTML dynamically

jQuery is a JavaScript library, downloadable here. It uses AJAX calls to get external data. Retrieving this data is simple - I used two functions:

function geturl(addr) {
var r = $.ajax({
 type: 'GET',
 url: addr,
 async: false
}).responseText;
return r;
}

function changediv() {
$('#div_id').html(geturl('http://www.example.com'));
}

UPDATE: For asynchronous ajax calls see example in the comments below.