I need to hide a section from an html page:
<h1 data-ng-show="!menuPinned && !isSaaS" class="logo floatLeft" aria-hidden="false"><span>XXX </span><span style="font-weight: bold;">XXX </span><span>XXXXX</span></h1>
The following code works fine in Chrome dev. tools
var ibmlogo = document.querySelectorAll('h1.logo.floatLeft');
ibmlogo[1].remove();
But when I load the page with the script active, the section (h1) won't disappear. I believe this is because when the script runs, the DOM has not been completed loaded yet, hence the script fails to find the selector.
I have tried many different things (e.g. window.onLoad) but still my script is not effective. Last attempt (failed) is the following:
var logo = document.querySelectorAll('h1.logo.floatLeft');
logo.onload = function() {removeLogo()};
function removeLogo(){
console.log("### logo array lenght: " + logo.length);
logo[1].remove();
};
Tampermonkey. Tampermonkey is one of the most popular browser extensions with over 10 million users. Tampermonkey is used to run so-called userscripts (sometimes also called Greasemonkey scripts) on websites.
Required:
@run-at: document-start in userscript metablock.
// ==UserScript==
..............
// @run-at document-start
..............
// ==/UserScript==
Now with the above your options are:
Simply inject a style that hides the logo:
(document.head || document.documentElement).insertAdjacentHTML('beforeend',
'<style>h1.logo.floatLeft { display: none!important; }</style>');
Use MutationObserver to detect and delete the element immediately after it's added into DOM.
new MutationObserver(function(mutations) {
// check at least two H1 exist using the extremely fast getElementsByTagName
// which is faster than enumerating all the added nodes in mutations
if (document.getElementsByTagName('h1')[1]) {
var ibmlogo = document.querySelectorAll('h1.logo.floatLeft')[1];
if (ibmlogo) {
ibmlogo.remove();
this.disconnect(); // disconnect the observer
}
}
}).observe(document, {childList: true, subtree: true});
// the above observes added/removed nodes on all descendants recursively
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