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LAITONEN / Search fields' focus / unfocus

// ==UserScript==
// @name           Search fields' focus / unfocus
// @namespace      searchInputs
// @description    Auto-focus on the search / input fields of the specified website. By default (wikipedia, ldoceonline, translate.google.com, thesaurus.com).
// @features
//                 1. When you go to the websites, included into this file through @include 'website name' lines below - focus on search field instantly.  
//                 2. On "alt" (event.keyCode === 18) click - unfocus. Change the unfocus triggering button by choosing the keyCodes on this page: 
//                 https://www.cambiaresearch.com/articles/15/javascript-char-codes-key-codes 
//                 and substituting the number 18 in the code with the one that you found on the page above.
// @beforeTheUse   1. Substitute the below-included websites links with the ones that you oftenly use. 
//                 Do not forget: 1. Add star sign (*) at the end of the url; 2. If the script will not be working, find out the id / class name of the seacrh / input
//                 field on your website (for example, through 'inspect' feature of Chrome) and modify the if-statement blocks accordingly.
// @include        https://en.wikipedia.org/wiki/*
// @include        http://www.ldoceonline.com/*
// @include        https://translate.google.com/*
// @include        http://www.thesaurus.com/*
// @version        1.1
// @author         LAITONEN
// V1.01 added functionality on accessing any wikipedia page, not only the main one
// V1.02 added 2nd row with the focusing on the search input with a different id or class name
// V1.1  added functionality to unfocus the search field on button click;
//       included http://www.thesaurus.com/*
// ==/UserScript==

// https://en.wikipedia.org/wiki/
if (document.getElementById('searchInput'))
{
    var element = document.getElementById('searchInput');
    element.addEventListener('keydown', function(){
        if(event.keyCode === 18){
            document.getElementById('searchInput').blur();
        }
    });
    element.focus();
}

// http://www.ldoceonline.com/*
else if (document.querySelector('.search_input'))
{
    var element = document.querySelector('.search_input');
    element.addEventListener('keydown', function(){
        if(event.keyCode === 18){
            document.querySelector('.search_input').blur();
        }
    });
    element.focus();
}

// https://translate.google.com/*

else if (document.getElementById('source'))
{
    var element = document.getElementById('source');
    element.addEventListener('keydown', function(){
        if(event.keyCode === 18){
            document.getElementById('source').blur();
        }
    });
    element.focus();
}

// http://www.thesaurus.com/*

else if (document.getElementById('q'))
{
    var element = document.getElementById('q');
    element.addEventListener('keydown', function(){
        if(event.keyCode === 18){
            document.getElementById('q').blur();
        }
    });
    element.focus();
}