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How can I hide a button when scrolled to the top of a page?

I'm trying to adapt this JSFiddle to make the menu button on my website hide when I'm at the top of the page and show when I start scrolling down.
I modified the JS to match the CSS on my site. Then I placed it in tags in the head of my page
var $scb = $('<div class="toggle-menu-wrap"></div>');
$('.top-header').append($scb);
var $ccol = $('.content');
$ccol.scroll(function(){
$scb.stop(true,true).fadeTo(500, $ccol.scrollTop() > 10 ? 1 : 0);
});
However, it still doesn't work. Am I making a mistake in how I'm modifying the JS to fit my CSS?

You can include the toggle-menu-wrap element in your HTML from the start. There is no need to insert it using JS.
Write the one line of CSS you need, which is to hide the element from the beginning
.toggle-menu-wrap {
display: none;
}
Your version of jQuery uses 'jQuery' instead of '$' to reference itself. I would also re-write your JS like:
jQuery(document).ready(function() {
fadeMenuWrap();
jQuery(window).scroll(fadeMenuWrap);
});
function fadeMenuWrap() {
var scrollPos = window.pageYOffset || document.documentElement.scrollTop;
if (scrollPos > 300) {
jQuery('.toggle-menu-wrap').fadeIn(300);
} else {
jQuery('.toggle-menu-wrap').fadeOut(300);
}
}

Like #murli2308 said in the comments above, you need to attach a scroll event listener to the window:
$(document).ready(function () {
var $scb = $('<div class="scroll-border"></div>');
$('.above').append($scb);
var $ccol = $('.content');
$(window).scroll(function(){
$scb.stop(true,true).fadeTo(500, $ccol.scrollTop() > 10 ? 1 : 0);
});
})
Wrapping your code in $(document).ready() would also be a good idea.
The reason $ccol.scroll(function() { ... works in that fiddle is because of the CSS:
.content{
height: 200px;
width: 200px;
overflow: auto;
}
Notice overflow: auto;. This causes that specific div to be scrollable. However, on your website, you scroll the entire page, not $ccol. This means the event handler will never fire a scroll event (since $ccol will never scroll).

You might have forgotten to link Jquery.
<script type="text/javascript" src="http://code.jquery.com/jquery-1.8.3.min.js"></script>
Link this inside your head tag incase.....

This should do the job:
$(window).scroll(function(e){
if ($(this).scrollTop() > 0) {
$(".your_element").css("display", "block");
} else {
$(".your_element").css("display", "none");
}
});

How to use javascript to hide and let divs reappear

I am trying to make webpage where there is a div in the center which is being changed, instead of going to different pages.
Ultimately, I would like to have the new div, when clicking on an arrow, to flow from right or left in to the center. But first I would like to make the divs appear and disappear when clicking on the arrows but unfortunately this doesn't work.
This is my javascript:
<script>
function changeToHome() {
document.getElementById("mainmain").style.display="block";
document.getElementById("mainmain2").style.display="none";
document.getElementById("mainmain3").style.display="none";
document.getElementById("mainmain4").style.display="none";
}
function changeToStudy() {
document.getElementById("mainmain").style.display="none";
document.getElementById("mainmain2").style.display="block";
document.getElementById("mainmain3").style.display="none";
document.getElementById("mainmain4").style.display="none";
}
function changeToJob() {
document.getElementById("mainmain").style.display="none";
document.getElementById("mainmain2").style.display="none";
document.getElementById("mainmain3").style.display="block";
document.getElementById("mainmain4").style.display="none";
}
function changeToContact() {
document.getElementById("mainmain").style.display="none";
document.getElementById("mainmain2").style.display="none";
document.getElementById("mainmain3").style.display="none";
document.getElementById("mainmain4").style.display="block";
}
function changePageRight() {
var displayValue5 = document.getElementById('mainmain').style.display;
var displayValue5 = document.getElementById('mainmain2').style.display;
var displayValue6 = document.getElementById('mainmain3').style.display;
var displayValue7 = document.getElementById('mainmain4').style.display;
if (document.getElementById('mainmain').style.display == "block") {
document.getElementById("mainmain").style.display="none";
document.getElementById("mainmain2").style.display="block";
}
else if (document.getElementById('mainmain2').style.display == "block") {
document.getElementById("mainmain2").style.display="none";
document.getElementById("mainmain3").style.display="block";
}
else if (document.getElementById('mainmain3').style.display == "block") {
document.getElementById("mainmain3").style.display="none";
document.getElementById("mainmain4").style.display="block";
}
else if (displayValue8 == block) {}
}
function changePageLeft() {
var displayValue = document.getElementById('mainmain').style.display;
var displayValue2 = document.getElementById('mainmain2').style.display;
var displayValue3 = document.getElementById('mainmain3').style.display;
var displayValue4 = document.getElementById('mainmain4').style.display;
if (displayValue == "block") { }
else if (displayValue2 == "block") {
document.getElementById("mainmain").style.display="block";
document.getElementById("mainmain2").style.display="none";
}
else if (displayValue3 == "block") {
document.getElementById("mainmain2").style.display="block";
document.getElementById("mainmain3").style.display="none";
}
else if (displayValue4 === "block") {
document.getElementById("mainmain3").style.display="block";
document.getElementById("mainmain4").style.display="none";
}
}
</script>
Now I have a few divs that look like this:
<div id="mainmain4">
<img style="width:400px;height:327px;margin-left:auto;margin-right:auto;display:block;" src="Untitled-22.png" />
<h2> My name </h2>
<p>Hi,</p>
<p>Some text</p>
</div>
With these css atributes:
#mainmain {
float: left;
width: 575px;
display: block;
position: relative;
}
And all other divs with display: none; so I can change this to block and the one that was block to none.
For some reason, after when I click on one button of the menu, which activates a changeToX() function, the arrows work great. But before that, when you first go to the website, it doesn't.
Can someone explain me what I do wrong?

You don't tell the browser which divs shall be displayed on load. You can use theonloadevent for this:
<body onload="changeToHome()">
One additional hint: you maybe don't want to use inline JavaScript and CSS.

jQuery is as this simple:
<script src="//code.jquery.com/jquery-1.11.0.min.js"></script>
toggle!
<div id="mainmain">test text</div>
<script>
// you need this, only apply javascript when all html (dom) is loaded:
$(document).ready(function() {
$('.toggle-container').on('click', function(e) {
e.preventDefault(); // this prevents the real href to '#'
// .toggle() is like "on / off" switch for hiding and showing a container
$($(this).data('container')).toggle();
});
});
</script>
This function can be reused, because it is based on classes instead of id's.
Check this JSFiddle: http://jsfiddle.net/r8L6xg15/

Maybe this is of some use. I've tried to make a page control-like behaviour. You can select any container div and put elements in there that have the class 'page'. The JavaScript code will let you navigate those with buttons.
You can make it more fancy by adding the buttons through JavaScript. What you then have is basically a list of pages which are normally displayed as regular divs, but when the script kicks in, it changes them to a page control.
You can call this for any parent element, and in that sense it behaves a bit like a jQuery plugin. It is all native JavaScript, though. And not too much code, I hope. Like you said, I think it's good to learn JavaScript at first. It is very powerful by itself, and it's becoming increasingly powerful. jQuery adds a lot of convenience functions and provides fallbacks in case browser don't support certain features, or when implementations differ. But for many tasks, bare JavaScript will do just fine, and it certainly can't hurt to know your way around it.
Press the 'Run this snippet' button at the bottom to see it in action.
function Pages(element)
{
// Some initialization
var activePage;
// Find all pages within this element.
var pages = document.querySelectorAll('.page');
var maxPage = pages.length - 1;
// Function to toggle the active page.
var setPage = function(index)
{
activePage = index;
for (p = 0; p <= maxPage; p++)
{
if (p == activePage)
pages[p].className = 'page active';
else
pages[p].className = 'page inactive';
}
}
// Select the first page by default.
setPage(0);
// Handler for 'previous'
element.querySelector('.prev').onclick = function()
{
if (activePage == 0)
return;
setPage(activePage - 1);
}
// Handler for 'next'
element.querySelector('.next').onclick = function()
{
if (activePage == maxPage)
return;
setPage(activePage + 1);
}
// Add a class to the element itself. This way, you can already change CSS styling
// depending on whether this code is loaded or not. So in case of an error, the
// divs are just all show underneath each other, and the nav buttons are hidden.
element.className = element.className + ' js';
}
Pages(document.querySelector('.pages'));
.pages .page {
display: block;
padding: 40px;
border: 1px solid blue;
}
.pages .page.inactive {
display: none;
}
.pages .nav {
display: none;
}
.pages.js .nav {
display: inline-block;
}
<div class="pages">
<button class="nav prev">Last</button>
<button class="nav next">Next</button>
<div class="page">Page 1 - Introduction and other blah</div>
<div class="page">Page 2 - Who am I? Who are you? Who is Dr Who?</div>
<div class="page">Page 3 - Overview of our products
<ul><li>Foo</li><li>Bar</li><li>Bar Pro</li></ul>
</div>
<div class="page">Page 4 - FAQ</div>
<div class="page">Page 5 - Contact information</div>
</div>
To dos to make this a little more professional:
Add the navigation through JavaScript
Disable the buttons when first/last page has been reached
Support navigation by keys too (or even swipe!)
Some CSS transform (fade or moving) when toggling between pages
Smarter adding and removing of classes. Now I just set className, which sucks if someone would like to add classes themselves. jQuery has addClass and removeClass for this, which is helpful. there are also stand-alone libraries that help you with this.
Visible indication of pages, maybe with tabs at the top?

if var > then div display: none

I have a variable lineNum that increment when I click on h1
I am trying to make 'if' make a div display:none, but I just cant type the if code right?
Here is the if JQuery line I am having trouble with below:
if (lineNum > 1) {blue-sun-div, display: none;}
thank you for your help : )
***EDIT:
hello
here is the jquery code I have made ( my first jquery coding project)
Two divs move across the screen when I click 'h1'and 'h2', 'var' also increments. When 'var' goes 1 or above: blue-sun-div should disappear.
I can make the blue-sun-div disapear if I refresh the browser but only whilst i manually enter 'var' =1 or more ,so I have the div-name correct, but it will not disappear when lineNum++ raises the var 'lineNum' past 1 automatically.
Do I need to re trigger the code at the end, after lineNum does its job?
sorry if this does not make sense. its 4am here.
here is the code. thank you very much
$(document).ready(function() {
var lineNum = 0;
$("h1").click(function() {
$("#blue-sun-div, #red-sun-div").animate({
"left": "+=200px"
}, 1000);
});
$("h2").click(function() {
$("#blue-sun-div, #red-sun-div").animate({
"left": "-=200px"
}, 1000);
});
lineNum++;
if(lineNum > 1) {
$("#blue-sun-div").css({ display: "none" });
}
})

To make an element have css display: none, you can use the following method:
Pure JavaScript:
if(lineNum > 1) {
document.getElementById("blue-sun-div").style.display = "none";
}
With JQuery (I recommend this)
if(lineNum > 1) {
$("#blue-sun-div").css({ display: "none" });
}
This is assuming you have a <div id="blue-sun-div"> ....

just do:
if blue-sun-div is a classname
if(lineNum>1){
$(".blue-sun-div").hide();
}
if blue-sun-div is an ID
if(lineNum>1){
$("#blue-sun-div").hide();
}

do you have access to jquery? or are you just using plain javascript?
the easiest way would be:
if(lineNum > 1)
{
$('#blue-sun-div').hide();
}
this assumes that you have jquery setup already and that blue-sun-div is the id of the div (<div id="blue-sun-div">)
if it is the class (<div class="blue-sun-div">) then the jquery above needs to change to $('.blue-sun-div').hide();
for plain javascript, the best way would be to create a hide function and call it in the onclick of the h1.
in your javascript:
function hideDiv(divId){
document.getElementById(divId).style.display="none";
}
then in the html:
<h1 id="SomeID" onclick="hideDiv('blue-sun-div');">H1 TEXT</h1>

Javascript Collapsible Menu (hide the other elements)

I have the following working Javascript function:
function collapsible(zap) {
if (document.getElementById) {
var abra = document.getElementById(zap).style;
if (abra.display == "block") {
abra.display = "none";
} else {
abra.display = "block";
}
return false;
} else {
return true;
}
}
When I use the following in html code it displays or hides the "element" div:
<li>Element</li>
Thats working fine. But the problem is, that I want to use the function for multiple links, and then the other elements, that were clicked before, stay, open.
How can I reprogram the code, so that only one div stays open and the other gets closed if i click on another link?
Thanks beforehand!

If you could use jQuery and more importantly jQueryUI accordion I think it would accomplish exactly what you're looking for.
However, without using those two, here is how I would structure it. Like mentioned above, I would use classes to modify the styles of the divs you want shown or hidden. Then the js code can just toggle those classes on each of your elements. The slightly more difficult part (without jquery) is modifying class values since in your final application you may have lots of classes on each div. This is just a very crude example to get you going.
Working JSFiddle Example
Sample DOM
<div >
<li>Element1</li>
<div id='elem1' class='myelem visible'>
Element 1 contents
</div>
</div>
<div >
<li>Element2</li>
<div id='elem2' class='myelem'>
Element 2 contents
</div>
</div>
<div >
<li>Element3</li>
<div id='elem3' class='myelem'>
Element 3 contents
</div>
</div>
Sample JS
window['collapsible'] = function(zap) {
if (document.getElementById)
{
var visDivs = document.getElementsByClassName('visible');
for(var i = 0; i < visDivs.length; i++)
{
visDivs[i].className = visDivs[i].className.replace('visible','');
}
document.getElementById(zap).className += " visible";
return false;
}
else
return true;
}
Sample CSS:
.myelem {
display: none;
}
.visible {
display: block;
}

The way to go is to create a class(or maybe two), like collapsible and active or open that has this style(display: block or none) and then you working adding or removing the class.
The logic would be:
Links that has the class collapsible when clicked would add the active or open class which would give the behavior that remains opens(or active) by css.
If you want to hide others elements you would look for the elements with the class collapsible and then remove the active(or open) class if has any.

Here is my solution: http://jsfiddle.net/g5oc0uoq/
$('.content').hide();
$('.listelement').on('click', function(){
if(!($(this).children('.content').is(':visible'))){
$('.content').slideUp();
$(this).children('.content').slideDown();
} else {
$('.content').slideUp();
}
});
show() and hide() can be used instead of slideUp() and slideDown() if you have performance issues.

CSS button: hover, disabling then re-enabling with javascript

I have some buttons which have a hover effect which makes the button color darker on hover ( with css ).
When the user clicks on those buttons, i disable them via javascript.
when i want the procedure ( game ) to start again and i re-enable the buttons via javascript, the css button: hover effect does not work any more.
Any solutions?
the javascript enable/disable button functions are:
function jsEnableElement(id) {
if ( document.getElementById(id) ) {
document.getElementById(id).style.background = "#3399FF";
document.getElementById(id).style.cursor = "pointer";
document.getElementById(id).disabled = false;
}
}
function jsDisableElement(id) {
if ( document.getElementById(id) ) {
document.getElementById(id).style.background = "#DDDDDD";
document.getElementById(id).style.cursor = "default";
document.getElementById(id).disabled = true;
}
}

I'm not sure why the behaviour breaks when you change the background color of an element eventhough you keep its ID or Class name. But appearently it does.
So another way for you to fix this, and its perhaps a better way is to change the class of the element.
I don't know what element you want to disable, but i'm using a DIV as example. A working demo can be found here:
http://jsfiddle.net/yVVk6/
But just for completness i'll add the code in here aswell
<html>
<head>
<script>
function jsEnableElement(id) {
if ( document.getElementById(id) ) {
document.getElementById(id).removeAttribute("disabled");
document.getElementById(id).className = "enabled";
//document.getElementById(id).disabled = false;
}
}
function jsDisableElement(id) {
if ( document.getElementById(id) ) {
document.getElementById(id).removeAttribute("enabled");
document.getElementById(id).className = "disabled";
//document.getElementById(id).disabled = true;
}
}
</script>
</head>
<body>
<div id="hallo" class="enabled" onclick="jsDisableElement('hallo');">Click me to disable</div>
<div onclick="jsEnableElement('hallo');">Click me to enable it again</div>
</body>
CSS:
.enabled {
background: #3399FF;
}
.enabled:hover {
background: #00FF66;
}
.disabled {
background: #DDD;
}
EDIT:
Just another thing i would like to mention is, if you go with this solution, then i really advise you to use a library like jQuery. It allows you to easily edit, delete or add classes to elements. In this example i simply delete all classes from the element.

I think you can directly give the attribute as shown below:
document.getElementById("btnL1").setAttribute("disabled","true") //to disable the button
document.getElementById("btnL1").removeAttribute("disabled") //enable it again