Automatically fills out characters from your "memorable information" on TSB. For use with https://tampermonkey.net/ in e.g. Chrome.

tsb_memorable_information_autofill.tampermonkey.js

// ==UserScript==
// @name         TSB Memorable Information Autofill
// @namespace    http://henrik.nyh.se/
// @version      0.1
// @description  Automatically fills out characters from your "memorable information". Prompts for the full string the first time only. Intentionally fills out but doesn't submit, so you're in control.
// @author       Henrik Nyh
// @match        https://internetbanking.tsb.co.uk/personal/logon/login/
// @grant        GM_setValue
// @grant        GM_getValue
// @updateURL    https://gist.githubusercontent.com/henrik/f7d25092582f64bf15925671692e8f49/raw
// ==/UserScript==

(function() {
  "use strict";

  // The page loads on the "#/login" page, then "navigates" to "#/memorableInformation".
  window.addEventListener("hashchange", function() {
    if (location.hash !== "#/memorableInformation") return;

    var memorableInformation = GM_getValue("memi");

    if (!memorableInformation) {
      memorableInformation = prompt("Please enter your memorable information. It will only be stored locally on your machine.");
      GM_setValue("memi", memorableInformation);
    }

    if (!memorableInformation) return;

    var retryInterval = setInterval(function() {
      var positions = document.getElementById("page").innerText.match(/enter characters (\d+), (\d+) and.(\d+)/);

      if (positions) {
        clearInterval(retryInterval);
      } else {
        return; // Try again in a while.
      }

      var positionA = parseInt(positions[1]);
      var positionB = parseInt(positions[2]);
      var positionC = parseInt(positions[3]);

      var dropdownA = document.getElementById("charXPos");
      var dropdownB = document.getElementById("charYPos");
      var dropdownC = document.getElementById("charZPos");

      dropdownA.value = memorableInformation[positionA - 1];
      dropdownB.value = memorableInformation[positionB - 1];
      dropdownC.value = memorableInformation[positionC - 1];

      // Seems we also need to trigger an event for Angular to notice these fields changed.
      var e = document.createEvent("HTMLEvents");
      e.initEvent("change", false, true);
      dropdownA.dispatchEvent(e);
      dropdownB.dispatchEvent(e);
      dropdownC.dispatchEvent(e);

    }, 100);

  }, false);

})();