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Website does not function after I edited content

I recently "made" a website for a friend and it stopped working after I edited some of the content. I don't know why the whole website is broken. It should have images and such...
Please take a look at the website and tell me if anything stands out to why it doesn't work. Thanks!
I have looked at all the html tags and they are all fine.

Your problem is opacity for <article> div is 0:
#main article{
opacity: 0;
}
change to
#main article{
opacity: 1;
}

You have set the opacity to 0 for all ARTICLE elements within your main DIV. I see you have a transition setup for opacity, so I'm assuming you meant to either adjust that opacity value via a script or an animation. Either way, until you implement such, remove the opacity style:
#main article {
...
opacity: 0;
}

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;
}

Is there any jQuery library for elements entrance animation while page scroll?

Any one know a good library for elements entering animation while page scrolling. I have used animate it library, its awesome, lite and easy to handle but not working with newest version of jQuery(3.x).
Somebody suggest me a good free library.

You may try animate-on-scroll:
https://michalsnik.github.io/aos/
Or if you need a more advanced library with lot more control in your hands, try ScrollMagic:
http://scrollmagic.io/

you can use Animate.css and Wow.js

You could use the onscroll event handler.
window.onscroll - function() {
var el = document.getElementById('animateMe');
el.addClass('anime');
}
where you have the animation included in the .anime class.
CSS
.anime {
animation: yourAnimation 2s ease-out;
}
#keyframes animation {
0% {
background: blue;
}
100% {
backgroudn: red;
}
}
If you need the animation to stop when not scrolling, see How do I know when I've stopped scrolling Javascript.

Text appear in zoom in effect

How can we show text in zoom in effect. I saw it on one travel site. I did google but cant find this kind of effect. I just want little hint what kind of effect is this. I red about easing but did not find the same effect. I have attached screenshot for the same. Here is link of that website http://cleartrip.com/flights?ui=v3. The effect is on payment page

Ok, so when you do something to make the section appear, the button within it animates from nothing to 100% size from its center point. So basically what you are asking is how to make something grow from 0% to 100% via animation. There's probably a totally javascript way but I personally would use css animation for this.
Suppose you are adding a class to the parent div to reveal a section of content (in the example you linked to it is revealing a section of the order form) all you need to do is in the css add an animation to the button that is triggered when the section gets a class added. In my example below I'm calling the section 'page' and assuming you're adding a class of 'active' to reveal it - obviously these could be anything you like:
Html:
<div class="page">
<div class="animated_button">Look at me</div>
[other content that you don't want to animate]
</div>
Css:
.page{
display:none;
}
.active{
display:block;
}
.animated_button{
[styling for how you want your button to look]
}
.active .animated_button{
animation: growUp 0.4s;
}
#keyframes growUp {
0% { transform:scale(0); }
100% { transform:scale(1); }
}
Note that you may need to add vendor-prefixes for the transforms.
Here is a codePen - there's a few extra styles and stuff in there just to show an example of how it works:
http://codepen.io/chrisboon27/pen/weJmL

Change div height onclick with animation

I'm trying to make a gallery using divs that change their height when you click on them. Ideally, this would include animation to smoothly expand the div's height. There will be several of each div on each page, so it needs to just expand that section.
It's actually supposed to turn out something like the news section on this page: http://runescape.com/
I'd like to do it with JavaScript/jQuery if possible.

$('div').click(function(){
$(this).animate({height:'300'})
})
Check working example at http://jsfiddle.net/tJugd/

Here's the code I ended up using:
JS:
document.getElementById("box").addEventListener("click", function() {
this.classList.toggle("is-active");
});
CSS:
#box {
background: red;
height: 100px;
transition: height 300ms;
width: 100px;
}
#box.is-active {
height: 300px;
}
HTML:
<div id="box"></div>
Fiddle:
https://jsfiddle.net/cp7uf8fg/

try
$('div').toggle(function(){
$(this).animate({'height': '100px'}, 100);
}, function(){
$(this).animate({'height': '80px'}, 100);
});
DEMO

jQuery rules. Check this out.
http://api.jquery.com/resize/

The complete solution:
Both spacer DIV and Margin or Padding on content DIV works but best to still have a spacer DIV.
Responsive design can be then applied to it in your CSS file.
This is mutch better as with JAVA the screen would flicker!
If you use a grid system there will be a media query part there you need to include your settings.
I use a little spacer on HD screen while its increasing till mobile screen!
Still if you have breadcrumb in header multiple lines can be tricky, so best to have a java but deferred for speed resons.
Note that animation is for getting rid of flickering of screen.
This java then would only fire if breadcrumb is very long otherwise single CSS applied via the grid and no flickering at all.
Even if java fired its doing its work via an elegant animation
var header_height = $('#fixed_header_div').height();
var spacer_height = $('#header_spacer').height() + 5;
if (header_height > spacer_height) {
$('#header_spacer').animate({height:header_height});
};
Note that I have applied a 5px tolerance margin!
Ho this helps :-)

I know this is old, but if anyone seems to find their way here. #JacobTheDev answer is great and has no jQuery! I have added a little more for use cases where the event is not being assigned at the same point your toggling the css class.
HTML
<div id='item' onclick='handleToggle()'> </div>
JS
handleToggle(event){
document.getElementById(event.target.id).classList.toggle('active')
}
CSS
#item {
height: 20px;
transition: 1s;
}
.active {
height: 100px;
}