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JavaScript - Event listener with window.matchMedia not triggering

I've panned through countless solutions to this problem and none of them have fixed my issue. I very simply have a navigation bar, which, when on a mobile browser, disappears and becomes replaced with a button, whose function is to show and hide the navigation bar.
Now, I want my listener to, when the window is shrunk, show the button and hide the navigation bar. When the window is expanded, the button should be hidden and the navigation bar should be shown. The button is working as it should be, since the media query doesn't affect it. My listener appears to not run at all, except when the page is reloaded.
My script is contained inside of a PHP header which is included at the beginning of all my pages. Here's what I've got:
Media Query Listener (contained in header.php code)
// ... navbar code, opening script tag, yadda yadda
function mediaQueryCheck(inputQuery) {
var content = document.getElementById("navigation");
if (inputQuery.matches) {
// it matches
content.style.display = "none";
} else {
// it does not match
content.style.display = "block";
}
}
var mobileQuery = window.matchMedia("screen and (max-width: 638px)");
mediaQueryCheck(mobileQuery);
mobileQuery.addEventListener(mediaQueryCheck);
// closing script tag
The element #navigation is a div element containing the navigation bar. I will provide any other relevant code, if necessary.

Using addListener instead of addEventListener fixed the problem.

for whoever needs another solution:
you may use this function:
function getWidth() {
var maxWidth = Math.max(
document.body.scrollWidth,
document.documentElement.scrollWidth,
document.body.offsetWidth,
document.documentElement.offsetWidth,
document.documentElement.clientWidth
);
console.log(maxWidth); // for testing only
if(maxWidth === 776){
//do sth
}
if(maxWidth === 992){
//do sth
}
return maxWidth;
}
window.addEventListener("resize", getWidth);
now you have the width of the screen all the time
this is just another way of doing things... you may wanna use whatever serves your purpose.

You have to check it every time, when window is resized.
window.addEventListener('resize', function(){
mediaQueryCheck(mobileQuery);
});

Styles created using JavaScript are not applied until page is refreshed

I have created a script that adds the scrollTop value to the height of a DIV
var scroll = $(this).scrollTop();
console.log(scroll);
function scrollH() {
document.getElementById("overlay").style.height = scroll + 'px';
}
document.getElementById("overlay").addEventListener("scroll", scrollH());
I need this style to keep updating (I'm making a progress bar). Currently it only changes when I refresh the page.
Thanks in advance
(Sorry if I did not follow the correct question format for this site, this is my first question :L )

You want to apply styles via JavaScript after the DOM has loaded.
JQuery helps with this:
$(document).ready(function() {
//do something to css
});
https://learn.jquery.com/using-jquery-core/document-ready/

You could apply a listener to whatever event is triggering an update, and then replace or fill the progressbar with it's new value.

How to enforce user must scroll pdf within iframe

I have a pdf file within iframe. I want user to scroll must in pdf file before submitting the form. i am trying with this,
var position = $('#myIframe').contents().scrollTop();
But not working. Please help me Thanks in advance.

If you don't mind making a static height for your iframe, I have a solution for you.
HTML and CSS
1. Wrap your iframe in a div container
2. set heights for both your container and iframe (height of container should be the height you want your frame to be seen and the iframe height should be large enough to show entire pdf.)
3. set container div's overflow to scroll
Now you have a scrollable "iframe".
Javscript
Get container element. (var containerEl = $("#container")[0];)
Write a scroll function. Within the scroll function find if the total height of the element (scrollHeight) is less than or equal to how much has been scrolled (scrollTop) plus the inner height (clientHeight) of the
element. If it is, remove disabled property from button
Here's the fiddle. Made some changes to #mJunaidSalaat's jsfiddle.

Well I've tried almost an hour on this, Researched it, finally coming to a conclusion that Unfortunately this is not possible using this method.
The PDF is usually not a DOM element, it's rendered by PDF reader software. Every browser has its own mechanism for rendering PDFs, there is no standard. In some cases, the PDF might be rendered by PDF.js; in those situations you might be able to detect scrolling. But Adobe Reader, Foxit, and some of the native PDF rendering don't provide that option.
I've also created a Github issue for this. But no use.
Sorry. Please update me if you could find any thing or any workaround.

I've made a Fiddle for your solution. You can disable the submit button for user until user scroll on your iframe.
function getFrameTargetElement(objI) {
var objFrame = objI.contentWindow;
if (window.pageYOffset == undefined) {
objFrame = (objFrame.document.documentElement) ? objFrame.document.documentElement : objFrame = document.body;
}
return objFrame;
}
$("#myIframe").ready(function() {
var frame = getFrameTargetElement(document.getElementById("myIframe"));
frame.onscroll = function(e) {
$('.submitBtn').prop('disabled', false);
}
});
Hope it helps.

try this
$("#myIframe").ready(function() {
var frame = getFrameTargetElement(document.getElementById("myIframe"));
frame.onscroll = function(e) {
$('.submitBtn').prop('disabled', false);
}
});

scrollTop not working automatically

I know there are a couple of questions to scrollTop already out there but I haven't really seen anything resembling my problem.
Using jquery 1.7.2 on an IE9 we have a page with three Tabs (JqueryUI).
The Data is connected and that resulted in us only having the current tab on the page. Changing tabs will remove the unseen one and reload the one we jump into.
The Scroll-Positions are stored correctly in variables on the base page but trying to set that position in the document-ready-function does not work.
An alert shows the correct number, so the function is actually called but the scrollbar does not move.
Calling the same function with a button on the page afterwards however works perfectly.
The document-ready-function on the tab's jsp is quite simple:
<script type="text/javascript">
jQuery(document).ready(function(){
setAhaScrollbar();
});
</script>
and the called function is quite simple as well:
function setAhaScrollbar() {
var scrollWert = $('#scrollbarAnhaengeartikel').val();
alert(scrollWert);
$('#anhaengeGridScrollable').scrollTop(scrollWert);
}
Called from document-ready it does nothing. Called from a button later on it works fine.
The div where the scroll position is supposed to be set is defined with overflow: auto and a fixed height

crollTop( value )
Description: Set the current vertical position of the scroll bar for each of the set of matched elements.
.scrollTop( value )
value
Type: Number
An integer indicating the new position to set the scroll bar to.
More Information
As the documentationsaid value should be number.
Try
var scrollWert = Number($('#scrollbarAnhaengeartikel').val());
or
var scrollWert = parseInt($('#scrollbarAnhaengeartikel').val());

Apparently it was primarily a timing problem. Maybe there were still things going on when document ready fired.
Changing that function to
jQuery(document).ready(function(){
setTimeout("setAhaScrollbar()", 500);
});
did the trick so my problem is solved.

Google related bar - how to keep from showing up on my website

A new "google related" bar shows up at the bottom of my website. It displays links to my competitors and other things like maps, etc. It is tied in with users using the google toolbar. If anyone has any ideas on how I can disable from displaying on my web side I would sure appreciate it.

Taken from http://harrybailey.com/2011/08/hide-google-related-bar-on-your-website-with-css/
Google inserts an iframe into your html with the class .grelated-iframe
So hiding it is as simple as including the following css:
iframe.grelated-iframe {
display: none;
}

Google removed div and frame names and put everything to important so original answer no longer works on my site. We need to wait for the iframe to be created and then hide it by classname. Couldn't get .delay to work, but this does...today anyway.
$(document).ready(function() {
setTimeout(function(){
$(‘.notranslate’).hide();},1000);
});

Following javascript code tries to find the google related iframe as soon as the window finishes loading. If found, it is made hidden, else an interval of one second is initialized, which checks for the specified iframe and makes it hidden as soon as it is found on page.
$(window).load(function (){
var giframe = null;
var giframecnt = 0;
var giframetmr = -1;
giframe = $("body > iframe.notranslate")[0];
if(giframe != null)
$(giframe).css("display", "none");
else
giframetmr = setInterval(function(){
giframe = $("body > iframe.notranslate")[0];
if(giframe != null) {
clearInterval(giframetmr);
$(giframe).css("display", "none");
} else if(giframecnt >= 20)
clearInterval(giframetmr);
else
giframecnt++;
}, 1000);});

Find the parent DIV element that contains the stuff in the bar. If it has an id or name attribute, and you can control the page CSS then simply add a rule for the element, i.e. if you see something like
<div id="footer-bar-div".....
then add a CSS rule
#footer-bar-div {display:none ! important}
This will not work if the bar is inside an iframe element, but even in that case you should be able to hide it using javascript, but you will need to find the name/id of the frame, i.e.:
var badFrame = document.getElementById('badFrameId').contentWindow;
badFrame.getElementById('footer-bar-div').style.display='none';
if the frame has a name, then instead you should access it with:
var badFrame = window.frames['badFrameName']
There is also a chance that the bar is generated on-the-fly using javascript. If it is added to the end of the page you can simply add a <noscript> tag at the end of your content - this will prevent the javascript from executing. This is an old trick so it might not always work.