Using Tampermonkey to Customise a Website

This is a demonstration of the power of the Tampermonkey extension to Chrome.

My employer, Codurance, have a page on their website listing the current staff:

Now it would be useful to know how many people we have listed.

If you were to visit that page, select inspect and type the following into the console of the browser:


This will return the count.

This is a start.

The next step is to make this more visible.

Install the Tampermonkey extension into Chrome.

This will add the following icon to your browser:

Tampermonkey icon

Visit the page you want to customise:

Press the tampermonkey icon

Select Create a new script

This will give you a script that looks like this:

// ==UserScript==
// @name New Userscript
// @namespace
// @version 0.1
// @description try to take over the world!
// @author You
// @match
// @grant none
// ==/UserScript==
(function() {
‘use strict’;
// Your code here...

Now replace // Your code here… with:

$(‘div.u-heading-v2-3–bottom h2’).text( ‘The Team (‘ + $(‘div.g-max-width-800’).length + ‘)’ );

Save this and view the page.

This will when you revisit the page change the label to include a count of how many people we have.

This is a great way to make small changes to a website that you don’t control.

If you want to allow other people to use an updateable script then you can publish the script on a public url and use the settings tab to record where it comes from.

This technique is great for customising third party websites that don’t quite do what you want them to. You can even add javascript dependencies into the page if you want to use them.

This results in this (numbers will vary):

Funny Characters in Elixir: Sigils

There are a number of special character sequences in Elixir, for example the pipeline operator |> but now I want to discuss the ~something options.

These are sigils. The magic is simple if you call ~x(“something”) then the compiler will translate this into a call to sigil_x

~r/foo/i becomes sigil_r(<<"foo">>, 'i')

See for more details.

This does mean that you can now write your own sigils.

Here are the built in sigils. If there is an uppercase/lowercase pair they work the same except the lowercase one escapes the content.

sigil_C/2          sigil_c/2 returns a charlist

sigil_D/2          Creates date types

sigil_N/2         Creates native datetime

sigil_R/2          sigil_r/2        Regular expressions  

sigil_S/2          sigil_s/2          Creates strings from literals

sigil_T/2          Creates time types

sigil_U/2          Creates a UTC Datetime

sigil_W/2          sigil_w/2          Creates a list of words by splitting on whitespace