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I have the JS script that makes one div disappear when showing another one. How to add fadein effect?

Here's my jsfiddle. The script itself is here:
$(function () {
$(".div1, .div2").hide();
$(".link1, .link2").bind("click", function () {
$(".div1, .div2").hide();
if ($(this).attr("class") == "link1")
{
$(".div1").show();
}
else
{
$(".div2").show();
}
});
});
How can I add smooth fadein effect when one div disappears and the other one shows up? Thanks!

$(".div1").fadeIn();
$(".div2").fadeOut();
Running example:
$(function () {
$(".div1, .div2").hide();
$(".link1, .link2").bind("click", function () {
var e = $(this);
$(".div1, .div2").fadeOut().promise().done(function() {
if (e.attr("class") == "link1"){
$(".div1").fadeIn();
} else {
$(".div2").fadeIn();
}
});
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
Link 1
Link 2
<div class="div1">I'm div1</div>
<div class="div2">I'm div2</div>
The promise() is used to avoid the collision between fadeOut and fadeIn transitions

It looks like you need the fadeIn() method from jQuery, as explained in the docs:
The .fadeIn() method animates the opacity of the matched elements. It is similar to the .fadeTo() method but that method does not unhide the element and can specify the final opacity level.
if ($(this).attr("class") == "link1") {
$( "#div1" ).fadeIn( "slow", function() {
// Animation complete
});
} else {
$( "#div2" ).fadeIn( "slow", function() {
// Animation complete
});
}
Instead of slow you can also use a number for indicating the fade-in time, in milliseconds.

updated your fiddle.
simply replace show() with fadeIn()
http://jsfiddle.net/cEJtA/572/

Changing the css of button when its active

I want to change the CSS for the element btn1 (its a button) while its active.
I want to look different as long as "story" is shown (when pressed shows a div, as long as the div is shown i want the button to have a different color from the normal css)
$(function() {
$('#btn1').on('click', function() {
$('#story').fadeToggle(400);
});
});

$('#btn1').on('click', function() {
$(this).toggleClass('active'); // add/remove a css class
$('#story').fadeToggle(400);
});
in your css add
.active{
// styles you wish to apply
}

Try .css() method:
$('#btn1').on('click', function() {
$(this).css({'border':'1px solid blue', 'color':'red'});
$('#story').fadeToggle(400);
});
Working Example

:active selector https://developer.mozilla.org/en-US/docs/Web/CSS/:active
and look on this site http://www.paulund.co.uk/css3-buttons-with-pseudo-classes

It sounds like you want to do this:
$(function() {
$('#btn1').on('click', function() {
$(this).css('background-color','red'); // or whatever
$('#story').fadeToggle(400, function() { // 'complete' callback function
$('#btn1').css('background-color','white');
});
});
});

fade in fade out with two divs does not work

I have the following code http://jsfiddle.net/largan/2n2Lf/25/
The idea is the div called soc_text to fade and fade out when hover on the soc_button div.
I have this script, but it doesn't seems to work.
$(document).ready(function()
{
$("div.soc_button").hover(
function () {
$("div.soc_text").fadeIn('slow');
},
function () {
$("div.soc_text").fadeOut('slow');
}
);
});
Any ideas?
Thanks

$(document).on("mouseover", "div.soc_button", function(){
$(this).find("div.soc_text").fadeToggle("slow");
});

Here's the answer:
$(document).ready(function () {
$("div.soc_button img").hover(
function () {
console.log();
$(this).parent().find('div.soc_text').fadeIn('slow');
},
function () {
$(this).parent().find('div.soc_text').fadeOut('slow');
}
);
});
I guess the code is self explanatory,
Regards

This applies the method to all matches with all div tags with soc_text css class
$("div.soc_text").fadeIn('slow');
Change this to
$(this).children('div.soc_text').fadeIn('slow');

fadeToggle seems to make the hidden div jump up

Hello I have two divs that fadeToggle with a timer as follows
<div id="div1">Hello</div>
<div id="div2" style="display:none;">World</div>
Javascript to make it toggle
$(document).ready(function(){
setInterval(ToggleDiv, 5000);
});
function ToggleDiv(){
$('#div1').fadeToggle("slow");
$('#div2').fadeToggle("slow");
}
Here is fiddle link http://jsfiddle.net/BnYat/
My issue is that the second div shows up before the first div is done toggle and then causes a jump up to the top.
If there a way to create a smooth transition from one div to the next without the jump effect happening?

A simple solution is to put both div elements in a single container, and position them absolutely:
<div id="container">
<div id="div1">Hello</div>
<div id="div2" style="display:none;">World</div>
</div>
#container div {
position: absolute;
}
Example fiddle
Alternatively, you could fade one out completely then fade the next in in the callback:
setInterval(ToggleDiv, 5000);
function ToggleDiv(){
$('#div1').fadeToggle("slow", function() {
$('#div2').fadeToggle("slow");
});
}
Example fiddle

$(document).ready(function(){
setInterval(ToggleDiv, 5000);
});
function ToggleDiv(){
$('#div1').fadeToggle("slow", function(){
$('#div2').fadeToggle("slow");
});
}

just use animate
$( "#div1" ).animate({
visibility:hidden
}, 5000, function() {
// Animation complete.
});
$( "#div2" ).animate({
visibility:visible
}, 5000, function() {
// Animation complete.
});

Try this
setInterval(ToggleDiv, 5000);
function ToggleDiv() {
var div = "#" + $('div:visible').attr('id');
var div2 = "#" + $('div:not(:visible)').attr('id');
$(div).fadeToggle("slow", function () {
$(div2).fadeToggle("slow");
});
}
DEMO
or
function ToggleDiv() {
if ($('#div1').is(':visible')) {
$('#div1').fadeToggle("slow", function () {
$('#div2').fadeToggle("slow");
});
} else {
$('#div2').fadeToggle("slow", function () {
$('#div1').fadeToggle("slow");
});
}
}
DEMO

mouseover doesn't show hidden div

<script>
$("#menu-item-58").mouseover(function() { $("#simple_sidenav-3").css('visibility','visible'); });
$("#menu-item-58").mouseout(function() { $("#simple_sidenav-3").css('visibility','hidden'); });
</script>
#simple_sidenav-3 {
visibility:hidden;
}
simple_sidenav-3 is a hidden div.
So why doesn't it show when mouse is over #menu-item-58?
Please check it here http://mentor.com.tr/wp/?page_id=164

try this instead:
jQuery("#menu-item-58").mouseover(function() {
jQuery("#simple_sidenav-3").css('visibility','visible');
});
$ is undefined.

You haven't wrapped your code in the jQuery DOM ready function. Put this between your <script> tags:
$(document).ready(function()
{
$("#menu-item-58").mouseover(function() { $("#simple_sidenav-3").css('visibility','visible'); });
$("#menu-item-58").mouseout(function() { $("#simple_sidenav-3").css('visibility','hidden'); });
}
This will bind the mouse events to the elements when the document (page) has been loaded.

Try changing #simple_sidenav-3 from visibility:hidden; to display:none; Then call something like .slideDown() for a nice effect.
Also, here's some improvements to your code:
jQuery(function() { //waits till the document is ready
jQuery("#menu-item-58").mouseover(function () {
jQuery("#simple_sidenav-3").slideDown();
}).mouseout(function () { //no need to use $("#menu-item-58") twice
jQuery("#simple_sidenav-3").slideUp();
});
});