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get a href attribute and set this attribute to other div

I have 3 classes with such a structure (this is slider in my web app):
<div class="emotion--digital-publishing">
<div class="dig-pub">
<div class="bg--image">/div>
<div class="dig-pub--layer center center">
<div class="layer--wrapper">
<div class="layer--content">
<div class="dig-pub--button">
</div>
</div>
</div>
</div>
</div>
</div>
I want to get href attribute of a and set a href atribute with this url to dig-pub. It is very important to me that this is the link (which class I clicked), because 3 classes have different links.
I would like to use jQuery.

You bind a click event to your anchor tag. you'll need to assign a class to the anchor tag too if you have many on the page so replace 'className' with your class name. I'm not sure how you want to assign it to the div so I've done it as a data-attribute as this is the conventional way to go.
$('a.className').on('click', function (){
$(this).closest('.dig-pub').attr('data-href', $(this).attr('href'));
});

(Don't forget to close the div on line 3 in your snippet)
jQuery('.dig-pub').on('click', function() {
url = jQuery(this).parent().find('a').attr('href');
jQuery(location).attr(url);
});
https://codepen.io/Kidkie/pen/gdaJjZ

First, add an id to the link and the div (easier to fetch the elements)
<div id="dig-pub" class="dig-pub">
<a id="id" href="/wilson-camo"></a>
Then, get the href
var href = $('#id').attr('href');
Set the value to the div
$('#dig-pub').html(href);
However, you could have find this easily on JQuery documentation.

Replacing div with another on click

My knowledge of javascript is close to none and I'm trying to have a div be replaced on click by another div.
<div class='replace-on-click'>
<h1>Click to Insert Coin</h1>
<div class='replaced-with'>
<div class='info-text'>
<h1>Title</h1>
<h2>Subtitles</h2>
</div>
<ul class='info-buttons'>
<li><a href='#' class='b1'>Buy Tickets</a></li>
<li><a href='#' class='b2'>Find Hotels</a></li>
</ul>
</div>
</div>
I'd like it so when you click "Click to Insert Coin", that will disappear and make the .replaced-with div take its place, hopefully with some kind of fade transition if possible. How do I go about doing this?

We will make use of jQuery because it helps us to get you desired behavior done in a few statements. So first include jQuery from somewhere in your head part of your HTML document.
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
Then somewhere include this Javascript code (e.g. create index.js and include it the way like the library code).
$(document).ready(function() {
$('h1').click(function() {
$(this).fadeOut(function() {
$('.replaced-with').fadeIn();
});
});
});
It does the following: When your document is ready, it adds an event handler on h1 waiting for clicks. On click, it first fades out the h1 and when it's done, it fades the other element in.
In your HTML document, include the hidden attribute to the object that should be hidden initially.
<div class='replaced-with' hidden>
Here you can find it working as well: http://jsbin.com/cuqoquyeli/edit?html,js,console,output

jquery custom data attribute not working inside div tag

I am using this div code
<div data-role="page" data-last-value="43" data-hidden="true" data-options='{"name":"John"}'></div>
and trying to print the values like
japp.init = function () {
console.log($("div").data("role"));
console.log($("div").data("lastValue"));
console.log($("div").data("hidden"));
console.log($("div").data("options").name);
});
This works fine if I put the above div tag directly inside body but as I put the div tag inside any other div tag it does not work and says undefined.
<div class="page">
<div data-role="page" data-last-value="43" data-hidden="true" data- options='{"name":"John"}'></div>
</div>
console prints undefined for above html.
Please let me know if anything is not clear

When getting data jQuery returns data from the first element matching selector, if the first div in DOM has no data - jquery won't return it.
try
japp.init = function () {
console.log($("div[data-role]").data("role"));
console.log($("div[data-lastValue]").data("lastValue"));
console.log($("div[data-hidden]").data("hidden"));
console.log($("div[data-options]").data("options").name);
});
or better give this div an id, and select by id like $('#someid').data('role')

Your selector is div and when you have more divs on your page jQuery will select (in this case) the first one.
<div class="page">
<div data-role="page" data-last-value="43" data-hidden="true" data- options='{"name":"John"}'></div>
</div>
In the above HTML the first div does not have data-* so it will result with an undefined value
You have to be more specific with your selectors
$('.page div').data('role')
Or
$('div:first div').data('role')

Try
$("div.page div").each(function(){
console.log($(this).data("whatever_you_need"));
});
etc.
This way you will cycle through all divs nested in div with class 'page'.

You aren't exactly specifying which div to get. Whenever you are trying to get specific data from a specific element, you should be sure which div you are accessing. This can either occur within an iteration of elements or by ID or an element in relation to an ID. It shouldn't be done based on tagname or even classname as they can be multiple. In this case, why not add an ID on the div you are trying to get so you can access it specifically:
<div class="page">
<div id="thisDiv" data-role="page" data-last-value="43" data-hidden="true" data- options='{"name":"John"}'></div>
</div>
Then access:
console.log($("#thisDiv").data("role"));
Also, it is bad for performance to wrap the same jquery object over and over, you can cache it like this:
$thisDiv = $("#thisDiv");
console.log($thisDiv.data("role"));
....

I believe it is because $("div") returns all occurrences of div and then selects the first to perform a function on. I'm not sure how you want to use this functionality but it might be worth considering something like this
JSFiddle where a class is used to select the correct div
$(function(){
console.log($(".div").data("role"));
console.log($(".div").data("lastValue"));
console.log($(".div").data("hidden"));
console.log($(".div").data("options").name);
});

give your Div a class like class="myClass"
<div class="page">
<div class="myClass" data-role="page" data-last-value="43" data-hidden="true" data- options='{"name":"John"}'></div>
</div>
and then you can change your jquery selector:
japp.init = function () {
console.log($(".myClass").data("role"));
console.log($(".myClass").data("lastValue"));
console.log($(".myClass").data("hidden"));
console.log($(".myClass").data("options").name);
});
otherwise jquery don't know which div you are looking for.
I hope this will help

Adding Additional Div breaks Existing Jquery Code

I have a very simple div with an image inside:
<div class="stack4">
<img src="images/002m.jpg" width=200>
</div>
And a very simple Jquery function for when you hover over the image:
$(function () {
$('.stack4>img').hover(function(){
prompt('hello');
});
});
This all works fine. However, I'm trying to add additional content to the page, and so put the following HTML directly after the end of the first div:
<div id="menucontainer" class="menuContainer">
<div id="menu" class="menuContent">
<img src="images/003m.jpg" />
<img src="images/004m.jpg" />
</div>
</div>
After I add this, the jquery prompt no longer works. Why would adding anothing div break my existing javascript command like that?

There has to be a script error in the page that is causing a failure. Or there is a very slight chance that your new html in some way introduces an invisible element that covers your stack4 image. If you can provide a link somebody could debug it for you.

It breaks because the selector no longer matches any elements (because the class selector .stack4 does no longer match any element).
<div id="menucontainer" class="menuContainer">
<div id="menu" class="menuContent">
<img src="images/003m.jpg" />
<img src="images/004m.jpg" />
</div>
</div>
$(function () {
$('.stack4>img').hover(function(){
prompt('hello');
});
});
If you look at your javascript, it will:
match any child image of an element with class name stack4
Add a hover listener to each image
Display a prompt on hover.
IF you look at your updated DOM structure, class stack4 no longer exists. To make it work again, you have to replace this selector with your new equivalent, which would be the div with id=menu and class=menuContent.
Now, depending on your needs, you can target either #menu>img or .menuContent>img. If you go with the first one, the javascript fragment will only work for a single menu, with the id of menu. However, if you choose the second approach, any content with the class menuContent will have this functionality. So I'd go with:
$(function () {
$('.menuContent>img').hover(function(){
prompt('hello');
});
});

Telling jQuery which (unique) div to do an action on

My plan is to have lots of boxes (an undefined amount). When show box is clicked under a box, it shows that particular box.
I have some unique divs in my html. The div is made unique by:
<div id="box-<%=box.id%>"></div>
In my application.js, I have
$('.show-box > a').click(function(){
$('#box').show();
});
I obviously need to have the box-id in the $('#box').show(); part but I'm unsure how to do that...
EDIT: adding more information
<div class="show-box">
Show
</div>
<div class="box" id="box-<%= box.id %>"></div>
The class is for styling.
Just to add, I know that the javascript link should link to an actual link. I'll fix that later.

You would use this inside the handler to refer to the specific .show-box > a that was clicked.
So it depends on what the relationship is between that and the box element you want to display.
When you say under, if that means that it is a sibling to the .show-box element, you can use .parent() to traverse up from the <a>, then use .prev() to traverse back to the box.
$('.show-box > a').click(function() {
// "this" refers to the <a> that was clicked.
$(this).parent().prev().show();
});
Ultimately, the correct solution depends on your actual HTML markup. If you provide that in your question, it would be helpful.
You could select by ID if you want, but it is often not necessary.

On easy way would be to name your box ids after you a ids, or write another attribute into the a. For example if your a tag's ID was "anchor1", assign the corresponding div an id of "box-anchor1". Then, reference it like this:
$('.show-box > a').click(function(){
$('#box' + this.attr('id')).show();
});

If the box and the link that shows it are logically related, you can skip the whole unique ID business by using the following:
HTML
<div class="container">
<div class="box">
<!-- stuff in the box -->
</div>
Show
</div>
jQuery
$("div.container a").click(function() {
$(this).prev().show(); // prev() will get the div.box element.
});
On the other hand, if they are not related structurally, you can use the fragment part of the URL to reference the box ID:
HTML
<div>
<div class="box" id="box-1">...</div>
<div class="box" id="box-2">...</div>
</div>
<div>
<a class="boxtoggler" href="#box-1">Show Box 1</a>
<a class="boxtoggler" href="#box-2">Show Box 2</a>
</div>
jQuery
$("a.boxtoggler").click(function() {
var boxId = $(this).attr("href");
$(boxId).show();
});
Note how we're abusing the fact that the fragment section of a URL is preceded by a # character to make it into a css ID ;)

Not sure I understood your question, but if you want to show the clicked box:
$('.show-box > a').click(function(){
$(this).parents('.show-box').show();
});