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Tampermonkey: Trigger event does not work for element

I'm trying to add some functionality using Tampermonkey on top of a providers angular application but I'm stuck at this simple thing. I can't replicate the issue using CodePen so we're going to have to go for theories and suggestions. I'll try to be as specific as I can.
Adding this interval when the page loads to check when an input with the id serialNumberInput is available. Then I'm adding a dropdown to the form, and attach an onChange event to it to update the serial input field with the value of the selected option. However, the trigger parts just never happens. It does work when I enter them manually, but not with the script.
var populateSerialNumbersTimer = setInterval(function(){
var serial = $("input#serialNumberInput");
if($(serial).length >= 1){
$(serial).css("display", "inline").css("width", "50%");
$(serial).after(deviceToSerialSelectionHTML);
$("select#deviceToSerial").on("change", function(){
$(serial).val($("select#deviceToSerial").val());
$(serial).trigger("change");
$(serial).trigger("blur");
});
clearInterval(populateSerialNumbersTimer);
}
}, 200);
I've thought about it and considering how the serial number ends up in the text field the field must be accessible. Maybe it's that the events that I'm trying to trigger has not been declared at the time of the function declaration?
Suggestions much appreciated.

It looks like jQuery tries to cache the event somehow. This is how I solved it with native javascript in case someone else is interested:
function triggerEvent(e, s){
"use strict";
var event = document.createEvent('HTMLEvents');
event.initEvent(e, true, true);
document.querySelector(s).dispatchEvent(event);
}
$("select#deviceToSerial").on("change", function(){
serialNumberInput.val($("select#deviceToSerial").val());
triggerEvent("change", "input#serialNumberInput");
triggerEvent("blur", "input#serialNumberInput");
}

jQuery slideToggle for multiple divs

What I am trying to do is have four links that each will display and hide a certain div when clicked. I am using slideToggle and I was able to get it to work with really sloppy and repetitive code. A friend of mine gave me a script he used and I tried it out and finally was able to get something to happen. However, all it does is hide the div and wont redisplay. Also it hides all the divs instead of just the specific one. Here is a jsfiddle I made. Hopefully you guys can understand what I am trying to do and help! Thanks alot.
Here is the script I'm using.
$(document).ready(function () {
$(".click_me").on('click', function () {
var $faq = $(this).next(".hide_div");
$faq.slideToggle();
$(".hide_div").not($faq).slideUp();
});
});
http://jsfiddle.net/uo15brz1/

Here's a link to a fiddle. http://jsfiddle.net/uo15brz1/7/
I changed your markup a little, adding id attributes to your divs. The jquery, gets the name attribute from the link that's clicked, adds a # to the front, hides the visible div, then toggles the respective div. I also added e.preventDefault to stop the browser from navigating due to the hash change. As an aside, javascript don't require the $ prefix.
$(document).ready(function () {
$(".click_me").on('click', function (e) {
e.preventDefault();
var name = $(this).attr('name');
var target = $("#" + name);
if(target.is(':visible')){
return false; //ignore the click if div is visible
}
target.insertBefore('.hide_div:eq(0)'); //put this item above other .hide_div elments, makes the animation prettier imo
$('.hide_div').slideUp(); //hide all divs on link click
target.slideDown(); // show the clicked one
});
});

Welcome to Stack Overflow!
Here's a fiddle:
http://jsfiddle.net/uo15brz1/2/
Basically, you need a way to point to the relevant content <div> based on the link that's clicked. It would be tricky to do that in a robust way with your current markup, so I've edited it. The examples in the jquery documentation are pretty good. Spend some time studying them, they are a great way to start out.

SharePoint 2013 List - Tooltip over Items

We have large SharePoint lists with lots of columns. Our users are forgetting which cells they are viewing because after scrolling the headers disappear (no way to freeze headers like in Excel).
We want to try adding tooltips to the cell items so when they hover over it will display a tooltip with the column name.
Has anyone ever tried doing this before?
I have the following code which works initially on the load but stops working after the user sorts, filters or switches the list into Edit mode:
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"></script>
<script type="text/javascript">
jQuery(
function()
{
$('td').hover
(
function()
{
var idx = jQuery(this).parent().children().index(jQuery(this));
jQuery(this).attr('title',jQuery(this).parent().parent().parent().find('th').eq(idx).text());
jQuery('div.ms-core-brandingText').html(jQuery(this).parent().parent().parent().find('th').eq(idx).text());
}
)
}
);
</script>

Your code stops working because SharePoint reloads the list content. This is a common issue when adding client side scripts to SharePoint pages.
First, you should actually be able to render a view with frozen headers. Right, it doesn't come out of the box, but there are third party datatable tools available.
Another option is to include your code via the Client Side Rendering option. This is a broad topic, so probably the first step would be to google it.

Okay, getting closer, using CSR instead of just jQuery. This works but needs each field specified manually. Looking for a way to apply this to every field in the view.
<script type="text/javascript">
SPClientTemplates.TemplateManager.RegisterTemplateOverrides({
Templates: {
Fields: {
'Comments': {
'View': function (ctx) {
return String.format('<span title="{0}">{1}</span>', this.FieldTitle, ctx.CurrentItem.Comments);
}
},
'Name': {
'View': function (ctx) {
return String.format('<span title="{0}">{1}</span>', this.FieldTitle, ctx.CurrentItem.Name);
}
}
}
}
});

It occurs since when filtering/sorting is getting applied the List View is reloaded.
How to hover List Item in SharePoint 2013
The following function could be used for hovering List Item cells in SharePoint 2013:
function hoverListItems()
{
$('tr.ms-itmhover td').hover(
function() {
var $td = $(this);
var $th = $td.closest('table').find('th').eq($td.index());
$td.attr('title',$th.text());
}
);
}
Since in SharePoint 2013 Client-Side-Rendering (CSR) is the default rendering mode, the example below demonstrates how to register hoverListItem function using OnPostRender event
SPClientTemplates.TemplateManager.RegisterTemplateOverrides({
OnPostRender: function() {
hoverListItems();
}
});
Note: using the specified technique List Item hover will also work after
sorting/filtering is applied.
References
Introduction to Client-Side Rendering in SharePoint 2013

Tool-Tip Work-around:
The solution I have been using is a simple, non-html solution. I simply create a link to an item; insert it's own address (so that it doesn't go anywhere); then under the new LINK tab type the tip you want in the Description box.
save the page then try mousing over your new link, voilà
Hope that helps some!

How can you tell which element was selected with a crossrider contextMenu

The data returned by the callback for appAPI.contextMenu is currently only the following:
pageUrl
linkUrl
selectedText
srcUrl
There doesn't seem like there's a way to tell what was actualy right clicked on, only a little information about it. I could for example search all images and find the one with the matching srcUrl, but what if the same image appears multiple times?
I could try catching right click events in extension.js and try to match them with context menu events, but this seems quite round about.
What's the expected method to find the selected element (after receiving the event in the page)?
Lets say for example I want to be able to right click an image and display:none it.

Currently, the Crossrider platform does not support the feature you require and I think your workaround is reasonable. However, I have forwarded your suggestion to the Crossrider development team, who will consider it for future releases.
[Disclosure: I am a Crossrider employee]

As a workaround, this actually seems quite reliable although I haven't tested much. TBH I was expecting coherency issues:
//in extension.js (background.js just forward context menu events)
var lastRightClicked = null;
window.addEventListener("contextmenu", function(e) { //I guess a mousedown event would work here too
lastRightClicked = e.target;
}, true);
appAPI.message.addListener({channel:"contextmenu"}, function(message) {
if (message.menuitem == "Hide")
lastRightClicked.style.display = "none";
});

How can I dynamically create a tweet button?

I'm currently trying to create a tweet button with the horizontal count feature dynamically:
JavaScript
var twitter = document.createElement('a');
twitter.setAttribute('href', 'http://twitter.com/share');
twitter.setAttribute('class', 'twitter-share-button twitter-tweet');
twitter.setAttribute('data-url','http://mindcloud.co.uk/idea/?idea=' + this.id);
twitter.setAttribute('data-count', 'horizontal');
twitter.setAttribute('data-via', 'jtbrowncouk');
twitter.style.top = '20px';
twitter.style.left = '300px';
twitter.innerHTML = "Tweet";
The problem i'm having is that the button is being displayed as a text link, not as a button with the horizontal count box.
I've created a facebook button in the same way, which works correctly, however to make it work I use the following:
JavaScript
var facebook = document.createElement('fb:like');
facebook.setAttribute('id', 'like'+this.id);
facebook.setAttribute('href', 'http://mindcloud.co.uk/idea/?idea=' + this.id);
facebook.setAttribute('layout', 'button_count');
facebook.setAttribute('send', 'false');
facebook.setAttribute('width' , '300');
facebook.setAttribute('font', '');
facebook.setAttribute('show_faces', 'true');
facebook.style.top = '0px';
facebook.style.left = '300px';
using the following:
FB.XFBML.parse();
to parse and draw the button. FB.XFBML.parse() comes from
http://connect.facebook.net/en_US/all.js
When I create the Tweet button statically inside a .html file it works correctly. I'm including the following script within my index page where the tweet button should be created dynamically:
<script type="text/javascript" src="http://platform.twitter.com/widgets.js"></script>
If you can see what i'm doing incorrectly please inform me!
The following screenshot gives a visual explanation to what is going wrong with the tweet button!
Solution:
I've now managed to solve the problem. The problem i'd imagine is that the twitter script is running on load, and not being re-run upon creating the element.
using the following jQuery works correctly!
$.getScript("http://platform.twitter.com/widgets.js");

It's worth noting that as of recently you can use the following twitter widget function:
twttr.widgets.load();
Assuming you've loaded the widgets.js file:
<script type="text/javascript" src="http://platform.twitter.com/widgets.js"></script>
This will dynamically re-create the tweet button for you.

I've now managed to solve the problem. The problem i'd imagine is that the twitter script is running on load, and not being re-run upon creating the element.
using the following jQuery works correctly!
$.getScript("http://platform.twitter.com/widgets.js");

You're just using the wrong code. To specify the URL, you use url, not data-url. This works:
var twitter = document.createElement('a');
twitter.setAttribute('href', 'http://twitter.com/share');
twitter.setAttribute('class', 'twitter-share-button twitter-tweet');
twitter.setAttribute('url','http://mindcloud.co.uk/idea/?idea=' + this.id);
twitter.setAttribute('data-count', 'horizontal');
twitter.setAttribute('data-via', 'jtbrowncouk');
twitter.style.top = '20px';
twitter.style.left = '300px';
twitter.innerHTML = "Tweet";
For more details, check out Twitter's documentation at https://dev.twitter.com/docs/tweet-button#properties