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Jquery this parameter for selecting child not working

I've been trying to change image source on hover, however i can use mousehover function with class name and do this. The challenge here is i'm going to dynamically call more divs with same class name so i'm trying to achieve this using the this method. for some unknown reason i couldn't execute my below code. can anyone suggest what seems to be the problem? Pasting my code below
$(".img_staff").mouseover(function() {
alert(2);
$(this).find('.staffimg:first-child').css("display","none");
$(this).find('.staffimg:nth-child(2)').css("display","block");
alert(3);
});
Both the alerts are working fine just the inbetween 2 lines are not working. i want to achieve this effect like moca tucson site's contact page
https://moca-tucson.org/contact/
I'm trying to recreate the same effect using Jquery

Apart from changing the image, the link that your provided also uses CSS transitions to bring that "image transition" effect.
Here's the similar effect with just CSS, without any javascript.
HTML:
<div>
<img src="https://moca-tucson.org/wp-content/uploads/2017/05/Ginger_Staff_Photos_001-800x800.jpg">
<img src="https://moca-tucson.org/wp-content/uploads/2017/05/Ginger_Staff_Photos_002-800x800.jpg">
</div>
CSS:
div img:last-child { opacity: 0 }
div:hover img:first-child { opacity: 0 }
div:hover img:last-child { opacity: 1 }
img {
position: absolute;
transition: 0.3s;
}

How can I adjust this javascript code so an animation is activated whenever the mouse hovers over the element?

So I used this code from Justin Aguilar's CSS3 Animation Cheat Sheet to activate an animation on a button when I hover over it:
<div id="object" class="pulse">
<script>
$('#animatedElement').hover(function() {
$(this).addClass("pulse");
});
</script>
The problem is that the animation just continues even when I am no longer hovering over the button. What can I do to make a button animate every time a user hovers over it, but stop when they move the mouse away? Whenever I tried to tweak it with anything involving .stop, it just keeps the animation from playing at all.
I am new to coding and this has been a huge pain today, so any help would be very much appreciated! Thanks!

You don't need JavaScript for that at all.
Use CSS selectors. #animatedElement:hover in your case.

Here you go with one more solution
$('#animatedElement').hover(function() {
$(this).addClass("pulse");
}).mouseleave(function(){
$(this).removeClass("pulse");
});
.pulse {
background: #000;
color: #fff;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="animatedElement">Hover Me!!!</div>
Hope this will help you.

the hover() method accepts two callbacks: one for when the mouse enters the html element, and one for when it leaves. Therefore, you could simply add another callback to your function to remove the "pulse" class.
$('#animatedElement').hover(function() {
$(this).addClass("pulse");
},
function(){
$(this).removeClass("pulse");
});
Alternatively, you could just go with Alex's excellent answer.

You can use CSS to make an animation, for example, in this code:
.pulse {
background: GREEN;
border-radius: 6px
transition-property: background, border-radius;
transition-duration: 1s;
transition-timing-function: linear;
}
.pulse:hover {
background: BLACK;
border-radius: 50%;
}
You have set in css the start properties for the element, and transition declaration, in this example i'm going to do a transition in the background and the radius properties when hover on a element with pulse class.

JQuery hover function opacity animation

trying to animate a divs opacity when hovering some other element. First I tried it with display none/block, but it read somewhere it's impossible to make a transition for that.
This is a little complicated, because this is supposed to work on each element of the same type with a different id the same. (Picture gallery with a caption to appear on the bottom of the img element when the picture is hovered.)
The HTML structure is like this:
<article id="{PostID}">
<div class="post-content">
<a><img></a>
<div class="post-content--padded">
<p>Caption of the picture.</p>
</div>
</div>
</article>
First I went with a mouseover, mouseout approach added to the post-content div which looked like this:
onmouseover="document.getElementById('{PostID}').getElementsByClassName('post-content--padded')[0].style.opacity='1.0';" onmouseout="document.getElementById('{PostID}').getElementsByClassName('post-content--padded')[0].style.opacity='0.0';"
That worked, but there was no transition. I've set the CSS up with transition handlers to apply to all the css changes within post-content--padded like so:
-webkit-transition: all 0.3s;
-moz-transition: all 0.3s;
transition: all 0.3s;
This doesn't seem to affect the mouseover, mouseout opacity change I do, so I tried adding .animate() to that, without much success. Well I got post-content to fade in and out, but not post-content--padded
Different approach
That all didn't work so much. So I tried using the JQuery function hover().
Long story short I added this above the html in question:
<script type="text/javascript">
$(document).ready(function(){
$('#{PostID}.post-content').hover(
function(){ $('#{PostID}.post-content.post-content--padded').stop().animate({'opacity': '1'}, 'slow');},
function(){ $('#{PostID}.post-content.post-content--padded').stop().animate({'opacity': '0'}, 'slow');}
);
});
</script>
This just doesn't want to work though. Endless browsing of stackoverflow and other sources didn't seem to help me with this. Being stuck on this for over an hour I decided to simply ask. It cannot be that hard to add a hover > opactiy transition.
Hope I've not been clear and people understand my issue here.

you can do it just using css if you need only on hover
.post-content--padded{
opacity: 0;
-webkit-transition: all 2s;
-moz-transition: all 2s;
transition: all 2s;
}
.post-content:hover .post-content--padded{
opacity: 1;
-webkit-transition: all 2s;
-moz-transition: all 2s;
transition: all 2s;
}
see demo HERE
and if you want to use Jquery
$('.post-content--padded').hide();
$('.post-content').hover(function(){
$(this).find('.post-content--padded').fadeToggle(2000);
});
see demo HERE

I also worked on combining hover with animate and it worked like that:
in CSS opacity for "a" = 0
and in jQuery:
$("#classy").hover(function(){
$("#classy").animate({
opacity:"1"
},200);
}, function(){
$("#classy").animate({
opacity:"0"
},200);
});

Here is a jQuery method that works:
HTML
<div id='hover-me'>hover over me</div>
<div id='change-me'>I change opacity</div>
CSS
.hide {
opacity:0;
}
JS
$('#hover-me').hover( function() {
if ($('#change-me').hasClass('hide')) {
$('#change-me').removeClass('hide', 'slow');
} else {
$('#change-me').addClass('hide', 'slow');
}
});
jsFiddle Demo
*This is with jQueryUI included

Toggle Div combined with CSS-Hover

I tried a lot to solve the following: A click on "#pageTitle" should open the "#expandMenu". The expandMenu is exactly located in the bottom of the menubar. As you can see in CSS, there is a hover effect on the background-color. The code works fine so far, but even thought I still have a problem: The menubar should stay in the hover-color, till the toogleMenu gets closed. The user need to reach the expandMenu with his mouse for interacting. But after that, with my current code the via jQuery added css doesn't reset itself to the default css-hover mode.
It also would be nice, if the solution could include the possibility to add some further events, for example a switching icon (open, closed)
The CSS:
#expandMenu {
background-color: #009cff;
opacity: 0.8;
height:65px;
width:100%;
display:none;
}
#menubar {
height:95px;
width: 100%;
color:#FFF;
}
#menubar:hover {
background-color:#0f0f0f;
transition: background-color 0.3s ease;
color:#FFF;
}
jQuery:
$(document).ready(function(e){
$("#pageTitle").click(function() { $('#expandMenu').slideToggle( "fast");
$('#menubar').css( "background-color", "#0f0f0f" ); } );
})
HTML:
<div id="menubar">
<div id="pageTitle">Start</div>
</div>
<div id="expandMenu">
</div>

I have created a fiddle here that I think captures your page pretty well. I have tweaked the css class for the menubar a little bit so that the text stays visible, but the main change I have made is adding a class to the #menubar rather than directly applying the new background color. Then when you are hiding the #expandMenu you can remove the class to go back to the original color, whatever it was.
I check whether the expandMenu is visible and adjust the classes accordingly:
if ($('#expandMenu').is(':visible'))
{
$('#menubar').removeClass('menu-active');
}
else
{
$('#menubar').addClass('menu-active');
}
I check this state before I toggle the menu item because the slideToggle takes some time to finish, and the div is not visible immediately after the call. Checking its state before applying the animation avoids this problem.

jQuery toggle class animation

I found this code:
$('li input:checked').click(function() {
$(this).parent().parent().toggleClass("uncheckedBoxBGColor", 1000);
});
It's working well, when a click the element for the first time. It fades the background color, but when I click it again, it delays for 1000 ms, and then flashes the other background color. I want it animated when it has the class, and when not, not only when clicked for the first time.

This is easy with CSS transitions:
JS:
$('li input:checked').click(function() {
$(this).parent().parent().toggleClass("uncheckedBoxBGColor", 1000);
});
CSS:
.uncheckedBoxBGColor {
background-color: orange;
/*other properties*/
transition: background-color .3s;
}
This will add the effect whenever the class is turned ON, but when it doesn't have that class then there are no transitions defined. So instead, you can turn on this transition for ALL <LI> elements like so:
CSS:
li { transition: background-color .3s; }
OR for all <INPUT> elements following an <LI><INPUT> combination:
li input { transition: background-color .3s; }
You get the idea of it..

The jquery.toggleClass function isn't made for fading anyhow. See http://api.jquery.com/toggleClass/ for more details.
If you want to fade in/out the background color, try using the CSS3 transition feature like explained at Mozilla's side: https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Using_CSS_transitions.

Maybe because you are using "input:checked"
try using
$('li input[type=checkbox]').click(function () {
$(this).parent().parent().toggleClass("uncheckedBoxBGColor", 1000);
});
this is working for me.