Wikidata Entity ID on Wikipedia

README.md

Wikidata Entity ID on Wikipedia

This userscript makes Wikipedia pages to show their corresponding Wikidata entity ID and link to it in the gray parentheses next to the entry title.

Install

Distributed under public domain.

screenshot.png

Wikidata_Entity_ID_on_Wikipedia.user.js

// ==UserScript==
// @name        Wikidata Entity ID on Wikipedia
// @namespace   https://gist.github.com/dahlia/dc722917730c501fc74085b058046495
// @description Show Wikidata Entity ID on Wikipedia pages
// @include     https://*.wikipedia.org/wiki/*
// @include     http://*.wikipedia.org/wiki/*
// @version     1
// @grant       none
// ==/UserScript==

(function () {
  var link = document.querySelector('#t-wikibase > a[href*="wikidata.org"]');
  if (!link) {
    return;
  }
  var url = link.href,
      match = /\/wiki(\/Special:EntityPage)\/(Q[1-9][0-9]*)(\?|$)/.exec(url);
  if (!match) {
    return;
  }
  var entityId = match[2],
      heading = document.querySelector('h1#firstHeading');
      wdLink = document.createElement('a');
  wdLink.href = url;
  wdLink.style.color = '#72777d';
  wdLink.style.textDecoration = 'none';
  wdLink.style.fontSize = '0.6em';
  wdLink.style.marginLeft = '0.4em';
  wdLink.style.fontFamily = '"Linux Libertine",Georgia,Times,serif';
  wdLink.style.fontWeight = 'normal';
  var userselect = '', prefixes = ['', '-moz-', '-webkit-'];
  for (var i = 0; i < prefixes.length; ++i) {
    userselect += prefixes[i] + 'user-select: none;';
  }
  wdLink.innerHTML = '<span style="' + userselect + '">(</span>'
                   + entityId
                   + '<span style="' + userselect + '">)</span>';
  heading.appendChild(wdLink);
})();