A little help with DOM manip and GreaseMonkey
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21-08-2019 - |
Question
I'm not a JS guy so I'm kinda stumbling around in the dark. Basically, I wanted something that would add a link to a twitter search for @replies to a particular user while on that person's page.
Two things I am trying to figure out:
- how to extract the user name from the page so that I can construct the right URL. ie. if I am on http://twitter.com/ev , I should get "ev" back.
- how to manipulate the DOM to insert things at the right place
Here's the HTML fragment I'm targetting:
<ul id="tabMenu">
<li>
<a href="/ev" id="updates_tab">Updates</a> </li>
<li>
<a href="/ev/favourites" id="favorites_tab">Favorites</a> </li>
</ul>
And here is the script (so far):
// ==UserScript==
// @name Twitter Replies Search
// @namespace http://jauderho.com/
// @description Find all the replies for a particular user
// @include http://twitter.com/*
// @include https://twitter.com/*
// @exclude http://twitter.com/home
// @exclude https://twitter.com/home
// @author Jauder Ho
// ==/UserScript==
var menuNode = document.getElementById('tabMenu');
if (typeof(menuNode) != "undefined" && menuNode != null)
{
var html = [];
html[html.length] = '<li>';
html[html.length] = '<a href="http://search.twitter.com/search?q=to:ev" class="section-links" id="replies_search_tab">@Replies Search</a>';
html[html.length] = '</li>';
// this is obviously wrong
var div = document.createElement('div');
div.className = 'section last';
div.innerHTML = html.join('');
followingNode = menuNode.parentNode;
followingNode.parentNode.insertBefore(div, followingNode);
}
Solution
Here's a pure-DOM method of the above -- and for kicks, I played with the extraction of the username as well:
var menuNode = document.getElementById('tabMenu');
if (menuNode!=null)
{
// extract username from URL; matches /ev and /ev/favourites
var username = document.location.pathname.split("/")[1];
// create the link
var link = document.createElement('a');
link.setAttribute('href', 'http://search.twitter.com/search?q=to:'+username);
link.setAttribute('id', 'replies_search_tab');
link.appendChild(document.createTextNode('@Replies Search'));
// create the list element
var li = document.createElement('li');
// add link to the proper location
li.appendChild(link);
menuNode.appendChild(li);
}
This is equivalent to (based on the original code snippet):
<ul id="tabMenu">
<li>
<a href="/ev" id="updates_tab">Updates</a> </li>
<li>
<a href="/ev/favourites" id="favorites_tab">Favorites</a> </li>
<li>
<a href="http://search.twitter.com/search?q=to:ev" id="replies_search_tab">@Replies Search</a></li>
</ul>
If you want the added link to show up in a different location, you'll need to futz around with insertBefore
a bit.
PS. Took the liberty of ignoring the "section-links" class, as that's formatting for x following, y followers, z updates links.
OTHER TIPS
Here is a way to do it, not really tested (no twitter account).
var userName = window.location.href.match(/^http:\/\/twitter\.com\/(\w+)/)
if (userName == null)
return; // Problem?
userName = userName[1];
var menuNode = document.getElementById('tabMenu');
if (menuNode != null)
{
var html = '<a href="http://search.twitter.com/search?q=to:' +
userName +
'" class="section-links" id="replies_search_tab">@Replies Search</a>';
var li = document.createElement('li');
li.className = 'section last';
li.innerHTML = html;
menuNode.appendChild(li);
}
It adds the li to the end, and I dropped the div because I doubt it is correct to put a li in a div. If you really need to put the li at the start of the ul, try menuNode.insertBefore(li, menuNode.firstChild)
Writing JavaScript without a library is a hell I can never return to.
Here is a script skeleton that enables jQuery:
// ==UserScript==
// @name MyScript
// @namespace http://example.com
// @description Example
// @include *
//
// @require http://ajax.googleapis.com/ajax/libs/jquery/1.3.1/jquery.min.js
// ==/UserScript==
var menuNode = $('#tabMenu');
if (menuNode!=null)
{
// extract username from URL; matches /ev and /ev/favourites
var username = document.location.pathname.split("/")[1];
// create the link
var link = $('<a id="replies_search_tab">@Replies Search</a>');
link.href = 'http://search.twitter.com/search?q=to:'+username;
// create the list element
var li = $('<li />');
// add link to the proper location
li.append(link);
menuNode.append(li);
}