Basic method to Add html content to the page with Greasemonkey?
Is there a Greasemonkey method to append basic HTML content to the end of a page right after the <body> tag, or right before it ends?
I found before/after methods but I need to know names of elements which may change page to page..
Answer
The quick and dirty way: Please only use innerHTML for brand-new content.
var newHTML = document.createElement ('div');
newHTML.innerHTML = ' \
<div id="gmSomeID"> \
<p>Some paragraph</p> \
etc. \
</div> \
';
document.body.appendChild (newHTML);
A complete script showing the somewhat better jQuery way (and with new, ECMAScript 6, multiline string):
// ==UserScript==
// @name YOUR_SCRIPT_NAME
// @include http://YOUR_SERVER.COM/YOUR_PATH/*
// @require http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js
// @grant GM_addStyle
// ==/UserScript==
//--- The @grant directive is used to restore the proper sandbox.
$("body").append ( `
<div id="gmSomeID">
<p>Some paragraph</p>
etc.
</div>
` );
Both methods will place the new content like this:
<!-- NEW STUFF INSERTED HERE -->
</body>
Which is a good place for it.
Even though the HTML is at the end of the page, you can use CSS to display it anywhere with something like:
GM_addStyle ( " \
#gmSomeID { \
position: fixed; \
top: 0px; \
left: 0px; \
} \
" );