I am trying to make a sticky top navigation bar that follows the screen when it reaches the top of the page. Basically, when it reaches the top of the page, the position is changed from relative to fixed.
My code works when I include the jScript internally inside the body of the HTML code. I am new to using jQuery, so if you guys can help me out.
Here is my html:
<html>
<head>
<title></title>
<link href="main-style.css" rel="stylesheet" type="text/css" />
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
<script type="text/javascript" src="sticky_nav.js"></script>
</head>
<body>
<header class="banner">
<div class="logo"></div>
<div class ="contact-info">
<div class="fb"></div>
</div>
</header>
<nav class="top-nav" id="top-nav">
</nav>
<div class="main">
</div>
</body>
</html>
Here is my css:
body {
padding-top: 450px;
background-image: url(background.jpg);
}
.banner {
left: 50%;
margin: 0 0 0 -25%;
position: fixed;
top: 0px;
height: 475px;
width: 950px;
z-index: -10;
background-image: url(img4.jpg);
}
.top-nav {
position: relative;
margin-left: auto;
margin-right: auto;
background: #F0742F;
width: 950px;
height: 70px;
z-index: 20;
margin-bottom: -60px;
box-shadow: 0 5px 3px rgba(0,0,0,.4);
text-align: center;
padding-top: 20px;
border-radius: 10px;
}
.top-nav a {
font: 25px bold;
text-decoration: none;
color: #FFF;
padding-left: 20px;
}
.top-nav-scrolled {
position: fixed;
width: 100%;
top: 0;
left: 50%;
margin: 0 0 0 -25%;
}
Here is my js:
var tn = $(".top-nav");
var tns = $(".top-nav-scrolled");
var hdr = $('header').height();
$(document).ready(function(){
$(window).scroll(function() {
if( $(this).scrollTop() > (hdr - 20) ) {
if( $(this).scrollTop() > (hdr - 20) ) {
tn.add(tns);
}
else {
tn.remove(tns);
})
});
When I put the js code internally, between script tags it works. So I'm not sure what I am doing wrong.
Since you call your sticky_nav.js in document head, non of the body elements do not exist yet. So, the error is in tn, tns and hdr declarations: they should be inside dom-ready function.
In addition, best praxis would be change the class via script, define class styles via CSS:
$(document).on('ready', function(){
var tn = $(".top-nav");
var hdr = $('header').height();
$(window).on('scroll', function() {
tn.toggleClass('top-nav-scrolled', $(this).scrollTop() > (hdr - 20))
});
});
$(this).scrollTop() > (hdr - 20)
looks weird.
I believe you need to cache the offset().top of the nav-bar (because it will change dynamically with position changes) and then check for it reached by window.
var tn = $(".top-nav");
var tns = $(".top-nav-scrolled");
var hdr = $('header').height();
var offset = tn.offset().top;
$(document).ready(function(){
$(window).scroll(function() {
if( $(this).scrollTop() > offset) {
tn.css("position", "fixed");
tn.css("top", "0");
tn.css("left", "50%");
tn.css("margin","0 0 0 -25%");
}
else {
tn.css("position", "relative");
tn.removeAttr("left");
tn.removeAttr("top");
tn.removeAttr("margin");
}
})
});
Like that.
And also, you can pass plain object to css() method, like this:
tn.css({
"position": "fixed",
"top": "0"
});
and so on.
Related
I'm trying to change the css position from fixed to static and viceversa, based on pixel scrolled...
The script works fine as espected, but at the point to change css position, there is a sort of lag.
If i scroll slow till at the point of switch, from the console i see the position switch fast from fixed to static and from static to fixed.
Anyway, look in the snippet, scroll near the end, and see what happen... I'm not able to figure out the reason. Hope in your help! Thanks!
Open the snipped in fullscreen to see better!
$(window).scroll(function() {
var scrolled = $(window).scrollTop();
var add_px = $('body').height();
var px_scroll = scrolled + add_px;
var tot = $(document).height();
var ftr = $('#footer').css("margin-bottom");
ftr = ftr.replace('px','');
ftr = ftr.replace('-','');
var total = tot - ftr;
if ( px_scroll > total ) {
$('#act_btns').css({'position':'static'});
} else {
$('#act_btns').css({'position':'fixed'});
}
});
html, body { height: 100%; margin:0; padding: 0; }
#main_container {
position: relative;
width: 100%;
height: auto;
min-height: 100%;
text-align: center;
}
#act_btns {
position: fixed;
margin: 0 auto;
left: 0;
right: 0;
bottom: 50px;
}
#act_btns input {
color: #fff;
border: 0px;
width: 100px;
height: 40px;
margin: 0 5px;
box-shadow: 0 0 5px 5px #000;
}
#footer {
position: absolute;
bottom: 0;
margin-bottom: -200px;
width: 100%;
background: rgba(0, 0, 0, 0.8);
padding: 10px 7px 15px 7px;
box-sizing: border-box;
text-align: center;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<html>
<body>
<div id="main_container">
<div style="position:relative;margin:0 auto 20px;width:80%;height:2500px;background:#ccc;"></div>
<div id="act_btns">
<input type="submit" name="save_list" id="save_btn" value="Salva">
<input type="submit" name="reset_list" id="rst_btn" value="Reset">
</div>
<div id="footer"><p id="copyright">Copyright © 2016 - 2021</p></div>
</div>
</body>
</html>
The problem you are facing is: You calculate the total value on every change of the scroll position. So when you scroll and change the position of the element from fixed to static you will add the height (60px) to total. (This is visible if you console.log(scrolled, total)). Because fixed position elements do not take up any space.
The most simple fix is to calculate the total when the page is loaded. And then, if it doesn't change you're good to go with that height forever. So the only change I did from your code is to move the calculation of total outside of the scroll function.
var tot = $(document).height();
var ftr = $('#footer').css("margin-bottom");
ftr = ftr.replace('px','');
ftr = ftr.replace('-','');
var total = tot - ftr;
$(window).scroll(function() {
var scrolled = $(window).scrollTop();
var add_px = $('body').height();
var px_scroll = scrolled + add_px;
if ( px_scroll > total ) {
$('#act_btns').css({'position':'static'});
} else {
$('#act_btns').css({'position':'fixed'});
}
});
html, body { height: 100%; margin:0; padding: 0; }
#main_container {
position: relative;
width: 100%;
height: auto;
min-height: 100%;
text-align: center;
}
#act_btns {
position: fixed;
margin: 0 auto;
left: 0;
right: 0;
bottom: 50px;
}
#act_btns input {
color: #fff;
border: 0px;
width: 100px;
height: 40px;
margin: 0 5px;
box-shadow: 0 0 5px 5px #000;
}
#footer {
position: absolute;
bottom: 0;
margin-bottom: -200px;
width: 100%;
background: rgba(0, 0, 0, 0.8);
padding: 10px 7px 15px 7px;
box-sizing: border-box;
text-align: center;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<html>
<body>
<div id="main_container">
<div style="position:relative;margin:0 auto 20px;width:80%;height:2500px;background:#ccc;"></div>
<div id="act_btns">
<input type="submit" name="save_list" id="save_btn" value="Salva">
<input type="submit" name="reset_list" id="rst_btn" value="Reset">
</div>
<div id="footer"><p id="copyright">Copyright © 2016 - 2021 VirtualCode.Net</p></div>
</div>
</body>
</html>
This could lead to some problems if you are loading images and what not which may take up more space (height) when completely loaded and the calculation already happened. To never face that issue you can wrap the calculation inside
$(window).load(function(){
// add total calculation code here
});
I'm having a hard time figuring out why the code below doesn't work as expected.
What I'm trying to achieve is same functionality with position:sticky whereas when the scrolled reaches the top of the #second-header then fixes its position below the #header which is also fixed, however, the height of the #header is unknown which is I believe can be calculated using the function outerHeight(true) on JQuery.
Then after reaching out to the bottom of the #second-header-container, remove the fixed position of #second-header turning it back to normal position.
Due to browser compatibility issues and other customization, I cannot simply use the position:sticky of css.
It looks like my logic is wrong, and I need help.
jQuery(document).ready(function(){
var $document = jQuery(document);
var header = jQuery('#header');
var second_header = jQuery('#second-header-container').find('#second-header');
var second_header_container = jQuery('#second-header-container');
var second_header_offset = second_header.offset().top;
var second_header_container_offset = second_header_container.offset().top;
jQuery(window).scroll(function(){
var top_margin = header.outerHeight(true);
var second_header_height = second_header.outerHeight(true);
var second_header_container_height = second_header_container.outerHeight(true);
if( jQuery(window).scrollTop() > (second_header_offset - second_header_height) && jQuery(window).scrollTop() < second_header_container_height) {
second_header.addClass('fixer');
second_header.css({position:'fixed', top:top_margin, 'z-index':'999999'});
} else {
second_header.removeClass('fixer');
second_header.css({position:'relative', top:'0px', 'z-index':'0'});
}
});
});
*{
color: #FFFFFF;
padding: 0;
margin: 0;
}
.fixer{
position: fixed;
width: 100%;
}
#header, .banner, #second-header, .contents{
padding: 5px;
}
#header{
position: fixed;
width: 100%;
height: 74px;
z-index: 99999;
background-color: #000000;
}
.banner{
padding-top: 84px;
height: 200px;
background-color: #583E5B;
}
#second-header-container{
min-height: 300px;
background-color: #775F5E;
}
#second-header{
padding-bottom: 10px;
padding-top: 10px;
background-color: #4C3D3C;
}
.contents{
min-height: 200px;
background-color: #97A36D;
}
.footer{
background-color: #80A379;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<header id="header">HEADER</header>
<div class="banner">BANNER</div>
<div id="second-header-container">
<div id="second-header">SECOND-HEADER</div>
<!--Other contents and elements...-->
</div>
<div class="contents">OTHER...</div>
<footer class="contents footer">FOOTER</footer>
To achieve this you need first check if the scroll height is near the second div header and within the height of the second div. Then add a class that make it stick below the main header. I have created a sticky class and added it while scrolling conditions are met.
Please check below code
jQuery(document).ready(function() {
var headerHeight = $('#header').outerHeight(true);
var secondHeaderContainer = $('#second-header-container');
const secondHeaderTopPos = secondHeaderContainer.offset().top;
const secondHeaderContainerHeight = $(secondHeaderContainer).height();
$(window).scroll(function() {
const scrollTop = $(this).scrollTop();
const secondContainerHeightEnd = secondHeaderContainerHeight + secondHeaderTopPos - $('#second-header').height() - headerHeight;
if (((secondHeaderTopPos - headerHeight) <= scrollTop) && (secondContainerHeightEnd >= scrollTop)) {
$('#second-header').addClass('sticky').css('top', headerHeight);
} else {
$('#second-header').removeClass('sticky');
}
});
});
* {
color: #FFFFFF;
padding: 0;
margin: 0;
}
.sticky {
position: fixed;
width: 100%;
top: 0;
left: 0;
}
.fixer {
position: fixed;
width: 100%;
}
#header,
.banner,
#second-header,
.contents {
padding: 5px;
}
#header {
position: fixed;
width: 100%;
height: 74px;
z-index: 99999;
background-color: #000000;
}
.banner {
padding-top: 84px;
height: 200px;
background-color: #583E5B;
}
#second-header-container {
min-height: 300px;
background-color: #775F5E;
}
#second-header {
padding-bottom: 10px;
padding-top: 10px;
background-color: #4C3D3C;
}
.contents {
min-height: 200px;
background-color: #97A36D;
}
.footer {
background-color: #80A379;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<header id="header">HEADER</header>
<div class="banner">BANNER</div>
<div id="second-header-container">
<div id="second-header">SECOND-HEADER</div>
<!--Other contents and elements...-->
</div>
<div class="contents">OTHER...</div>
<footer class="contents footer">FOOTER</footer>
I need to hide the div when the window scroll position is greater than the bottom position of the div. I tried to do it myself but I'm doing something wrong. Also got another question since I need a better code to text ratio to submit this question. Why when I alert(); img_top does it say object object?
$(document).ready(function(){
var img_height = $("#head").outerHeight();
var img_top = $("#head").offset();
var img_bot = img_height + img_top;
$(window).scroll(function(){
var wind_pos = $(window).scrollTop();
$("p").html(wind_pos);
if(wind_pos > img_bot){
$("#head").addClass("hide");
}
});
});
*{
margin: 0;
padding: 0;
}
body{
height: 4000px;
}
#head{
height: 600px;
background-color: blue;
}
.hide{
display: none;
}
p{
background-color: yellow;
width: 100%;
height: 50px;
}
<div id="head">
</div>
<p>
</p>
<script
src="https://code.jquery.com/jquery-3.2.1.min.js"
integrity="sha256-hwg4gsxgFZhOsEEamdOYGBf13FyQuiTwlAQgxVSNgt4="
crossorigin="anonymous"></script>
jQuery.offset() return object representing position of the matched element, you are suppose to read top property of it.
$(document).ready(function() {
var img_height = $("#head").outerHeight();
var img_top = $("#head").offset().top;
var img_bot = img_height + img_top;
$(window).scroll(function() {
var wind_pos = $(window).scrollTop();
$("p").html(wind_pos);
if (wind_pos > img_bot) {
$("#head").addClass("hide");
}
});
});
* {
margin: 0;
padding: 0;
}
body {
height: 4000px;
}
#head {
height: 600px;
background-color: blue;
}
.hide {
display: none;
}
p {
background-color: yellow;
width: 100%;
height: 50px;
}
<div id="head">
</div>
<p>
</p>
<script src="https://code.jquery.com/jquery-3.2.1.min.js" integrity="sha256-hwg4gsxgFZhOsEEamdOYGBf13FyQuiTwlAQgxVSNgt4=" crossorigin="anonymous"></script>
img_top
is an object because
$("#head").offset();
returns an object with top and left offsets,
you have to use
$("#head").offset().top
in your calculation
I made a copy of JSbin for practice, JSbin link here, actual site link here.
This is just a practice for making the front-end of websites as I just started learning web dev little over a week ago. You can put in html, css and javascript in the editboxes, and a page spit out in Output just like the actual JSbin.
But the problem is that you can resize the divs pass other divs.
My idea to prevent this from happening is:
1. get the editboxes' current positions
2. store the left/right position of the editbox if resized to 10% window width
3. set the min/max left and right for the draggable div
And hence the question. How do I set the max-left/right for the draggable.
Also, any idea on why the draggable before Output div is diificult to drag to the right.
Edit: How the site is structured. When you drag the .drag (.resize in my JSbin code), it changes its left and right div's left and right. And the draggables are contained in the #main's div.
<div id="main>
<div id="HTML"></div>
<div class="drag"></div> //drag this left and right to change the right of the HTML and left of CSS
<div id="CSS"></div>
<div class="drag"></div> //drag this left and right to change the right of the Css and left of JavaScript
<div id="JavaScript"></div>
<div class="drag"></div> //drag this left and right to change the right of the JavaScript and left of Output
<div id="Output"></div>
</div>
By taking advantage of jQuery Ui's built in draggable event which gives us position information and also allows us to set position on drag.
I came up with the following solution:
var dragDistance = 100;
$(".resize").draggable({
axis: "x",
containment: "parent",
drag: function( event, ui){
ui.position.left = Math.min( ui.position.left, ui.helper.next().offset().left + ui.helper.next().width()-dragDistance);
ui.position.left = Math.max(ui.position.left, ui.helper.prev().offset().left + dragDistance);
resize();
}
});
I removed your onDrag function in the process so it wouldn't interfere.
See the bin here:
JSBin
NOTES:
I haven't looked into it and maybe its just a JSBin issue because I can't reproduce it in your live site. But if the boundary lines disappear while you are dragging the code won't work. You'll probably have to increase the drag distance to the point where the lines don't disappear while dragging.
You may notice you have difficulty dragging the Output box that seems to be caused by the Iframe you have inside. If I comment out the IFrame I can drag it just fine. I haven't looked for a solution but perhaps experiment with some padding or margins so that the Iframe is not pegged so closely against the border. Or maybe if you detached it from the DOM while dragging that would fix it.
Use containment
Constrains dragging to within the bounds of the specified element or
region.
For Eg:
$( ".selector" ).draggable({
containment: "parent"
});
Click Here For a Demo
You could manually keep track of the position of each of the windows in the dragging() function, and only call the resize() method if they don't overlap:
function dragging(event) {
var CSS_left = parseInt($("#CSS").css("left"));
var JavaScript_left = parseInt($("#JavaScript").css("left"));
var Output_left = parseInt($("#Output").css("left"));
var offset = 100;
var checkOverlap1 = $(event.target).is("#1")
&& event.clientX + offset <= JavaScript_left
&& event.clientX >= offset;
var checkOverlap2 = $(event.target).is("#2")
&& event.clientX + offset <= Output_left
&& event.clientX - offset >= CSS_left;
var checkOverlap3 = $(event.target).is("#3")
&& event.clientX - offset >= JavaScript_left
&& event.clientX <= codeboxWidth - offset;
if (checkOverlap1 || checkOverlap2 || checkOverlap3) {
resize(event);
}
}
Here's the complete example - I also refactored/simplified your "resize" function.
var codeboxWidth = $("#codebox").width();
$(document).ready(function() {
$("#codebox").height($(window).height() - $("#topbar").height());
$(".content").height($("#codebox").height());
$(".editbox").height($(".content").height() - $(".contentheader").height());
$("#HTML").css("left", 0);
$("#HTML").css("right", "75%");
$("#CSS").css("left", "25%");
$("#CSS").css("right", "50%");
$("#JavaScript").css("left", "50%");
$("#JavaScript").css("right", "25%");
$("#Output").css("left", "75%");
$("#Output").css("right", 0);
});
function resize(event) {
if ($(event.target).is("#1")) {
$("#CSS").css("left", event.clientX);
$("#HTML").css("right", codeboxWidth - event.clientX);
}
if ($(event.target).is("#2")) {
$("#JavaScript").css("left", event.clientX);
$("#CSS").css("right", codeboxWidth - event.clientX);
}
if ($(event.target).is("#3")) {
$("#Output").css("left", event.clientX);
$("#JavaScript").css("right", codeboxWidth - event.clientX);
}
}
$(".resize").draggable({
axis: "x"
});
function dragging(event) {
var CSS_left = parseInt($("#CSS").css("left"));
var JavaScript_left = parseInt($("#JavaScript").css("left"));
var Output_left = parseInt($("#Output").css("left"));
var offset = 100;
var checkOverlap1 = $(event.target).is("#1")
&& event.clientX + offset <= JavaScript_left
&& event.clientX >= offset;
var checkOverlap2 = $(event.target).is("#2")
&& event.clientX + offset <= Output_left
&& event.clientX - offset >= CSS_left;
var checkOverlap3 = $(event.target).is("#3")
&& event.clientX - offset >= JavaScript_left
&& event.clientX <= codeboxWidth - offset;
if (checkOverlap1 || checkOverlap2 || checkOverlap3) {
resize(event);
}
}
body {
margin: 0;
padding: 0;
overflow-y: hidden;
overflow-x: hidden;
background: #F7F7F7;
font-family: Arial;
}
#topbar {
margin: 0;
padding: 0;
width: 100%;
height: 35px;
background: #EEEEEE;
position: relative;
}
h2 {
margin: 2px 0 0 0;
padding: 0;
float: left;
position: absolute;
}
#control {
width: 100%;
margin: 8px 0 0 0;
padding: 0;
position: absolute;
text-align: center;
}
.option {
margin: 0 -5px 0 0;
padding: 5px 10px 5px 10px;
text-align: center;
border-top: 1px solid #CCC;
border-bottom: 1px solid #CCC;
border-left: 1px solid #CCC;
text-decoration: none;
font-size: 0.9em;
color: black;
}
.option:first-child {
border-bottom-left-radius: 5px;
border-top-left-radius: 5px;
}
.option:last-child {
border-right: 1px solid #CCC;
border-bottom-right-radius: 5px;
border-top-right-radius: 5px;
}
.option:hover {
background: #dee5e5;
}
.opactive {
background: #EBF3FF;
}
.opinactive {
background: 0;
}
.active {
display: block;
}
.inactive {
display: none;
}
#codebox {
margin: 0;
padding: 0 width: 100%;
position: static;
top: 35px;
background: white;
}
.content {
margin: 0;
padding: 0;
min-width: 10%;
max-width: 100%;
position: absolute;
float: left;
color: #6DCAFC;
background: #F7F7F7;
overflow: hidden;
}
.resize {
top: 35px;
bottom: 0px;
width: 1px;
margin-left: 0;
height: 100%;
right: auto;
opacity: 0;
position: absolute;
cursor: ew-resize;
border-left-width: 1px;
border-left-style: solid;
border-left-color: rgba(218, 218, 218, 0.498039);
z-index: 99999;
background: #666;
}
.contentheader {
margin: 0;
padding: 0;
background: transparent;
position: relative;
}
.selectedcontent {
background: white;
}
.contentbox {
width: 100%;
height: 100%;
background: transparent;
position: relative;
box-sizing: border-box;
border-right: 1px solid darkgrey;
overflow: hidden;
}
.editbox {
width: 100%;
height: 100%;
background: transparent;
overflow: hidden;
}
.textareabox {
background: transparent;
min-width: 100%;
max-width: 100%;
min-height: 100%;
max-height: 100%;
border: none;
outline: none;
resize: none;
}
<!DOCTYPE html>
<html>
<head>
<title>Project 04</title>
<link rel="stylesheet" type="text/css" href="styles.css">
<link rel="stylesheet" href="https://ajax.googleapis.com/ajax/libs/jqueryui/1.11.4/themes/smoothness/jquery-ui.css">
</head>
<body>
<div id="topbar">
<h2>Code Runner</h2>
<div id="control">
HTML
CSS
JavaScript
Output
</div>
</div>
<div id="codebox">
<div id="HTML" class="content active">
<div class="contentbox">
<div class="contentheader">HTML</div>
<div class="editbox" id="HTMLeditbox">
<textarea id="HTMLcode" class="textareabox"></textarea>
</div>
</div>
</div>
<div class="resize active" id="1" style="left: 25%" ondrag="dragging(event)"></div>
<div id="CSS" class="content active">
<div class="contentbox">
<div class="contentheader">CSS</div>
<div class="editbox" id="CSSeditbox">
<textarea id="CSScode" class="textareabox"></textarea>
</div>
</div>
</div>
<div class="resize active" id="2" style="left: 50%" ondrag="dragging(event)"></div>
<div id="JavaScript" class="content active">
<div class="contentbox">
<div class="contentheader">JavaScript</div>
<div class="editbox" id="JavaScripteditbox">
<textarea id="JavaScriptcode" class="textareabox"></textarea>
</div>
</div>
</div>
<div class="resize active" id="3" style="left: 75%" ondrag="dragging(event)"></div>
<div id="Output" class="content active">
<div class="contentbox">
<div class="contentheader">Output</div>
<div class="editbox" id="Outputbox">
</div>
</div>
</div>
</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.11.4/jquery-ui.min.js"></script>
<script type="text/javascript" src="jscript.js"></script>
</body>
</html>
Here's a JSBin based on your example.
I am extremely new to JQuery, I just started looking into it today. I have searched all around for what might be causing this bit of code to not work. When you scroll down, I want the h1 to move to the side and a menu button to appear. That works, but when I scroll back up again, it takes an extremely long time to reverse itself. I have tried to fine anything that might be causing it like a delay or something, but as far as I can see, there isn't any problems.
Link to website: http://www.dragonmath.net/rockets
Here is my code:
HTML
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" type="text/css" href="styles/main.css" />
<title>Rockets</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
</head>
<body>
<header>
<img id="menu" src="images/menu1.png" />
<div id="headerdiv">
<h1>Rockets</h1>
<img id="logo" src="images/logo1.png" />
</div>
</header>
<nav>
<ul>
<li>
<a>Space Race</a>
</li>
<li>
<a>SpaceX</a>
</li>
</ul>
</nav>
<script>
$( document ).ready(function() {
var $menu = $('img#menu');
var $headerdiv = $("div#headerdiv")
var $nav = $('nav');
$(window).on('scroll', function () {
if ($(window).scrollTop() > 40) {
$headerdiv.addClass("testheaderdiv");
$menu.delay(800).slideDown(800);
$nav.addClass('testnav');
}
if ($(window).scrollTop() < 40) {
$menu.slideUp(800, function () {
$headerdiv.removeClass('testheaderdiv');
});
$nav.removeClass('testnav');
}
});
});
</script>
</body>
</html>
CSS
* {
margin: 0px;
padding: 0px;
color: #00AAFF;
font-family: Arial;
}
body {
height: 800px;
}
header {
position: fixed;
top: 0px;
left: 0px;
height: 100px;
width: 100%;
background-color: #333;
z-index: 1;
}
div#headerdiv {
display: inline;
transition: all 1s;
}
h1 {
display: inline;
margin-left: 40px;
font-size: 40px;
}
header > img#menu {
position: fixed;
top: 20px;
left: 40px;
width: 40px;
height: 40px;
display: none;
}
header > div > img#logo {
display: inline;
width: 60px;
height: 60px;
position: relative;
top: 18px;
left: 20px;
transition: height 1s, width 1s;
}
nav {
position: relative;
top: 100px;
height: 40px;
width: 100%;
background-color: #333;
}
nav > ul {
list-style: none;
}
nav > ul > li {
display: inline-block;
height: 40px;
width: 200px;
text-align: center;
border-right: 1px solid #00AAFF;
}
nav > ul > li > a {
position: relative;
top: 6px;
}
.testheaderdiv {
margin-left: 80px;
transition: all 1s;
}
.testnav {
display: none;
}
The main problem I could see with the code is how scroll is handled, for every scroll event you are adding delay to the menu element.
So try
$(document).ready(function () {
var $menu = $('img#menu');
var $headerdiv = $("div#headerdiv")
var $nav = $('nav');
var flag;
$(window).on('scroll', function () {
if (flag !== 1 && $(window).scrollTop() > 40) {
$headerdiv.addClass("testheaderdiv");
$menu.stop(true, true).delay(800).slideDown(800);
$nav.addClass('testnav');
flag = 1;
}
if (flag !== 2 && $(window).scrollTop() < 40) {
$menu.stop(true, true).slideUp(800, function () {
$headerdiv.removeClass('testheaderdiv');
});
$nav.removeClass('testnav');
flag = 2;
}
});
});