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Toggle display shows the hidden element for a second

I'm trying to show a hidden text on click of a button. But when I load the page, the text shows for a second and then disappears. Why would that happen?
<div class="container">
<p class="temp">This is temporary</p>
<button id="showme">Show</button>
</div>
$(document).ready(function() {
$(".temp").hide();
$("#showme").on("click", function() {
$(".temp").show();
});
});

Try to understand how the webpage loads. Your jquery is executed when the entire page is rendered with the associated CSS. So the browser displays your text for a second till it executes jquery to hide that text. So your browser needs to know that this text is hidden while parsing the html. You can do this by giving a CSS style to the text.
CSS:
.temp {
display: none;
}
HTML:
<div class="container">
<p class="temp">This is temporary</p>
<button id="showme">Show</button>
</div>
JS:
$(document).ready(function() {
$("#showme").on("click", function() {
$(".temp").show();
});
});

You should use inline style tag in <p> tag like this:
<p class="temp" style="display: none;">This is temporary</p>
instead of hiding it from jQuery!
$(document).ready(function() {
$("#showme").on("click", function() {
$(".temp").show();
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="container">
<p class="temp" style="display: none;">This is temporary</p>
<button id="showme">Show</button>
</div>

jQuery - Having the same HTML twice renders my script inoperative

I'm quite new to jQuery and I have come up with script which affects the HTML below. The script works perfectly and I have gotten it to whether I would like. The problem I am having
is when I'm duplicating the HTML and the script, once clicked, only shows the last project-info and project-images within the document. I've tried quite a few different methods just as
$(this).children()
but I can't seem to get any to work. Any help would be much appreciated.
Thank you
jQuery
$(document).ready(function() {
$('.apple').click(function() {
$('#darken').addClass('dark');
$('.project-info').delay('1000').slideDown('slow');
$('.project-images').delay('1000').fadeIn('slow');
});
});
$(document).ready(function() {
$('.close').click(function() {
$(".project-info, .project-images").fadeOut('slow');
});
});
HTML
<div class="apple">
<img src="http://mybroadband.co.za/photos/data/500/apple-logo.jpg"/>
</div>
<div class="project-info" style="display:none;">
<div class="project-title">
<h1>hello world</h1>
</div>
<div class="details">
<p>dkusdufhu suskueh sukh suefhuksdfnkuesnfukneukf nseuknfukenfuk nukefnuksn fukfuksukfnuksenf unseukfunfukfunufen u u u ef euhfuehfeufu g gfd gerjkg rjgrjg j js grg rgsg dkusdufhu suskueh sukh</p>
<div class="links">
link
</div>
<div class="close"></div>
</div><!-- end of project info -->
</div>
<div class="project-images" style="display:none;">
<div class="-images">
<img src="http://cdn4.spiegel.de/images/image-499233-galleryV9-grcy.jpg" />
<img src="http://cdn4.spiegel.de/images/image-499233-galleryV9-grcy.jpg" />
</div>
<div class="close end"></div>
</div> <!-- Project Images -->
</div> <!-- # Darken -- >

You're nearly there. Children wouldn't work in the above example because the divs with class 'apple' don't have any children. You need to move that first closing tag to the bottom of the portfolio item so that your html for each portfolio item is structured like this:
<!--PORTFOLIO ITEM-->
<div class="apple">
<!-- ICON GOES HERE-->
<img src="http://mybroadband.co.za/photos/data/500/apple-logo.jpg"/>
<!-- PROJECT INFO GOES HERE-->
<div class="project-info" style="display:none;">
</div>
<!-- PROJECT IMAGES GOES HERE-->
<div class="project-images" style="display:none;">
</div>
</div>
I.e. the divs with classes 'project-info' and 'project-images' are inside the 'apple' div. Then change this:
$('.project-info').delay('1000').slideDown('slow');
$('.project-images').delay('1000').fadeIn('slow');
to this:
$(this).children('.project-info').delay('1000').slideDown('slow');
$(this).children('.project-images',this).delay('1000').fadeIn('slow');
If you've updated your html correctly, $(this) will be pointing to a div element that does indeed have children with classes 'project-info' and 'project-images'. Here's an updated JSFiddle that should do you what you want: http://jsfiddle.net/8k3Ms/1/

JavaScript animate function doesn't work

This is what the code looks like.
<head>
<link type="text/css" rel="stylesheet" href="C:\Users\User\Desktop\css1.css" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script src="C:\Users\User\Desktop\js.js"></script>
</head>
<body>
<div id="header_wrap">
<div id="header">
<div id="logo">
LOGO
</div>
<div class="nav">
<a href="http://www.google.se">
Stuff
</a>
<a href="javascript:void(0)">
Other stuff
</a>
<a href="javascript:void(0)">
More stuff
</a>
</div>
<div class="mobile_nav"></div>
<div class="mobile_nav_menu">
<div class="mobile_menu">
<span>Stuff</span>
<span>Other stuff</span>
<span>More stuff</span>
</div>
<div class="mobile_close">
</div>
</div>
</div>
</div>
<div class="image_container">
<div class="inner_content" id="slide1">
<h2>
CONTENTS
</h2>
</div>
<a class="button" href="javascript:void(0)"></a>
</div>
</body>
the .js file contains this code
setTimeout(function(){
$("#slide1").css('opacity', '1');
},800);
setInterval(function(){
$(".button").toggleClass("opacity");
},1000);
//Navigation
$(".mobile_nav").click(function() {
$(".mobile_nav_menu").animate({right: 0});
})
$(".mobile_close").click(function() {
$(".mobile_nav_menu").animate({right: -270});
})
Can anyone help me out with what I'm doing wrong and how it can be fixed?
Thank you! /AJ
UPDATE: The .js loads (tried the alert function), but does not fill the function it should. Original pen can be found on http://codepen.io/yuriylianguzov/pen/qjwEe

One of the problems is that you are trying to reference a javascript file from a physical file path, and not a url (or relative path). You can't use your harddrive path in an html file to include javascript.
<script src="C:\Users\User\Desktop\js.js"></script>
If your javascript is in the same folder as your html, try something like this:
<script src="js.js"></script>
I'm not exactly sure what the expected behavior for the JavaScript is, because it appears to be doing what it is intended to do. If you look at the DOM in the codepen link that you provided the element with the id of 'slide1' has its opacity style set to 1 (see below) and the anchor tag with class of 'button' is getting the class 'opacity' toggled on and off every second (not depicted below, but you can see it happening in firebug).
<div class="image_container">
<div id="slide1" class="inner_content" style="opacity: 1;">
<h2>
We are who we choose to be.
</h2>
</div>
</div>
The other two click handler's are targeting empty elements (the element with class of 'mobile_nav', and the element with class of 'mobile_close') so they aren't going to do anything.
$(".mobile_nav").click(function() {
$(".mobile_nav_menu").animate({right: 0});
})
$(".mobile_close").click(function() {
$(".mobile_nav_menu").animate({right: -270});
})
<div class="mobile_nav"></div>
<div class="mobile_nav_menu">
<div class="mobile_menu">
<span>Projects</span>
<span>Profile</span>
<span>Contact</span>
</div>
<div class="mobile_close"></div>
</div>
I hope this helps!

1) Some of the elements your javascript is acting on don't have any content
2) Change the line $(".mobile_nav_menu").animate({right: 0}); to: $(".mobile_nav_menu").animate({"right": "0"}); and do the same with the other one, though it won't have any functionality, really.
3) your class mobile_nav_menu needs to have css that says position:relative for the attribute "right" to work.
4) I'd recommend moving your mobile_close div outside the mobile_nav_menu div so it doesn't move when you click it
If anyone has stuff to add, please do so.

jquery slidetoggle hide previous element

I'm working on a slideToggle function on click, I want to hide the previous element that was clicked when a new one is clicked, I've used this same set of code previously and its worked however it's no longer working now and I'm stumped at why its no longer works:
My code is as below or view a jsfiddle
js/js.js
$('.togglesources').hide();
$('.captionsource').on('click', function () {
$(this).next('.togglesources').slideToggle();
$(this).parent().siblings().children().next().slideUp();
return false;
});
index.html
<div class="mostpopular">
<h4>Nokia:</h4>
<h5>3100</h5>
<p>Most popular mobile phone of the year</p>
<div class="sources">
<p class="captionsource">Click to toggle source</p>
<div class="togglesources">
<p class="source">Wikipedia (Data Source)</p>
<p class="source">GSM Solution (Image Source)</p>
</div><!-- End Toggle Sources -->
</div><!-- End Sources -->
</div>
<!-- END MOST POP -->
<div class="mostpopular">
<h4>Lord of the Rings:</h4>
<h5>Return of the King</h5>
<p>Highest Grossing Film</p>
<div class="sources">
<p class="captionsource">Click to toggle source</p>
<div class="togglesources">
<p class="source">Wikipedia</p>
<p class="source">IMDB (Image Source)</p>
</div> <!-- End Toggle Sources -->
</div> <!-- End Sources -->
</div>
would appreciate some help in regards to this.
Why aren't the other '.togglesources' divs closing when I open a new one?

Try this:
$('.togglesources').hide();
$('.captionsource').on('click', function () {
$(this).closest('.mostpopular').siblings().find('.togglesources').slideUp();
$(this).next('.togglesources').slideToggle();
$(this).parent().siblings().children().next().slideUp();
return false;
});
Working Fiddle

.slideToggle() is being triggered many times?

I'm trying to create a Tumblr theme in which the links and post information slide in when you click a + sign. (My test blog is at http://noitsnotitsnotokay.tumblr.com/)
I'm quite the begginner at JavaScript, but I was able to work it out for a links menu with the following code:
<span class="btn">+</span>
<ul class="lks">
<!-- various links are here -->
</ul>
<script>
$("ul.lks").hide();
$("span.btn").click(function () {
$("ul.lks").slideToggle("slow");
});
</script>
But I also have a piece of code that applies to all posts, for the post information. I used nearly the same code, but, as you can probably see, it slides in and out various times.
<div class="pstinfo">
<!-- info is here -->
</div>
<span class="plsign">+</span>
<script>
$("div.pstinfo").hide();
$("span.plsign").click(function () {
$("div.pstinfo").slideToggle("slow");
});
</script>
It seems that the button's order and the way I name the classes in the JavaScript isn't changing much...any tips?

If you you don't want to open all the '.pstinfo' elements when you click on '.plsign', just the related one, try this code:
HTML:
<div class='parentContainer'> <!--put your elements in a parent Container -->
<div class='info'>
Info 1
</div>
<div class='plsign'>
+ Open
</div>
</div>
<div class='parentContainer'>
<div class='info'>
Info 2
</div>
<div class='plsign'>
+ Open
</div>
</div>
<div class='parentContainer'>
<div class='info'>
Info 3
</div>
<div class='plsign'>
+ Open
</div>
</div>
JS:
$(".plsign").on('click',function ()
{
$(this).parent().find('.info').slideToggle("slow");
});
Link to jsFiddle

code block 01
<span class="btn">+</span>
<ul class="lks">
<!-- various links are here -->
</ul>
<script>
$("ul.lks").hide();
$("span.btn").click(function () {
$("ul.lks").stop().slideToggle("slow");
});
</script>
Code block 02
<div class="pstinfo">
<!-- info is here -->
</div>
<span class="plsign">+</span>
<script>
$("div.pstinfo").hide();
$("span.plsign").click(function () {
$("div.pstinfo").stop().slideToggle("slow");
});
</script>
Try this code and Update the result :)