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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
              <!-- We now give the menu a class as well as an id, we'll change the class with JavaScript to alter the styleing -->
<ul id="menu" class="menu-up">

<!-- The menu item ID's are the section ID's with the word "link" added to the end -->
	<li id="aboutlink" class="menu-link">About Me</li>
	<li id="portfoliolink" class="menu-link">Portfolio</li>
	<li id="bloglink" class="menu-link">Blog</li>
</ul>

<!-- The wrapper gets a class too -->
<div id="wrapper" class="wrapper-up">

	<header>
  
    	<!-- clicking this word will check and uncheck the checkbox -->
		<p id="show-menu">Menu</p>

		<h1>Mobile Push Menu and smooth scrolling anchor links with JavaScript</h1>
<p>Click on the word Menu above to open or close the menu.</p>

<p>The anchor links on this page are no longer done with html. The Javascript now calculates the position the scrollbar is at using the body.scrollTop property and the position the browser should scroll to using the element.offsetTop property. Then in scrolls incrementally using the scrollBy method. The setInterval method is used to repeat the scrollBy method every 5 milliseconds.</p>

<h2>Potential Problems</h2>
<p>Currently the mouse cursor doesn't change to a pointer when hovering over these links, which could be confusing. That's easily fixed with CSS and :hover.</p>
<p>The scrolling happens at a constant speed. It might be made nicer with an ease-in and/or ease-out, but that would require a bit more code.</p>
<p>This works well in Chrome and Safari but IE and Firefox won't recognize <em>document.body.scrolltop</em>. The prefer <em>document.documentElement.scrollTop</em>. To accomodate both, replace <em>document.body.scrolltop</em> with <em>(document.documentElement &amp;&amp; document.documentElement.scrollTop) || document.body.scrollTop</em></p>
    
<p>These links are now completely useless if JavaScript is disabled. To make them still functional we could have left the orignal anchor tags in place and then added <em>return: false</em> to the onclick even handlers.</p> 
	</header>

	<section id="about">
		<h2>About Me</h2>
		<p class="top">Back to top</p>
		
	</section>

	<section id="portfolio">
		<h2>Portfolio</h2>
		<p class="top">Back to top</p>
		
	</section>

	<section id="blog">
		<h2>Blog</h2>
 		<p class="top">Back to top</p>

		
	</section>

</div>
            
          
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              /* We move the positioning and the transition into the menu and wrapper's various classes because they're subject to change. */
#menu {
	position: absolute;
}
#wrapper {	
	position: relative;
}

/* The 'up' classes are the default state where the elements are positioned on page load */
.menu-up {
	-webkit-transition: top .3s ease-in;
	transition: top .3s ease-in;
  
  top: -5em;
}
.wrapper-up {
	-webkit-transition: top .3s ease-in;
	transition: top .3s ease-in;
  
  top: 0;
}

/* The 'down' classes shift the elements when the menu button is clicked. */
.menu-down {
	-webkit-transition: top .3s ease-in;
	transition: top .3s ease-in;
  
  top: 0em;
}
.wrapper-down {
	-webkit-transition: top .3s ease-in;
	transition: top .3s ease-in;
  
  top: 5em;
}

/* The 'off' classes move the menu to the same position as the up classes. The difference is we turn off the transition so that the canvas doesn't scroll up after we jump to a link further down the page. */
.menu-off {
	-webkit-transition-property: none;
	transition-property: none;
  
  top: -5em;
}
.wrapper-off {
	-webkit-transition-property: none;
	transition-property: none;
  
  top: 0em;
}



/* Unnecessary styling stuff */
#menu {
	background-color: #FAD89B;
   width: calc(100% - 56px);
}
header, section {
	height: 1000px;
}
header {
	background-color: #B598A2;
}
#about {
	background-color: #73799E;
}
#portfolio {
	background-color: #809E90;
}
#blog {
	background-color: #BCBD9C;
}
            
          
!
            
              document.getElementById("show-menu").onclick=function toggleMenu() {
	if (document.getElementById("menu").className == "menu-up" 
	|| document.getElementById("menu").className == "menu-off") {
		document.getElementById("menu").className = "menu-down";
		document.getElementById("wrapper").className = "wrapper-down";
	} else {
		document.getElementById("menu").className = "menu-up";
		document.getElementById("wrapper").className = "wrapper-up";
	}
} //this function toggles the menu and wrapper between up and down positions


var menuLinks = document.getElementsByClassName("menu-link"); //An array containing the three menu links.

var clickedSection; // Will store the section ID after a link is clicked
var timer; // Stores the interval which makes the scrolling possible


var topLinks = document.getElementsByClassName("top"); // Contains the 'return to top links'
var fromTop; //Will store how far from the top the scrollbar is
var vOffset; //will store how far from the top an element is.
var scrollSpeed = 20; //This variable alters the scroll speed


for (i=0; i<=3; i++) {
	if (menuLinks[i]) {
		menuLinks[i].addEventListener("click", function() {
			clickedSection = this.id.replace("link",""); //Saves the name of the section the user has selected			
			menuSelect();
		});
	}
}



function menuSelect() {
	document.getElementById("menu").className = "menu-off";
	document.getElementById("wrapper").className = "wrapper-off";

	vOffset = document.getElementById(clickedSection).offsetTop; //Calculates how far in pixels the selected element is from the top
	fromTop = document.body.scrollTop; //Calculates how far in pixels the current scroll position is from the top
	timer = setInterval(scrollDown, 5); //calls the function scrollDown once every 5 milliseconds until clearInterval is applied
} 


for (i=0; i<topLinks.length; i++) {
	topLinks[i].addEventListener("click", function() {
		fromTop = document.body.scrollTop; //Calculates how far in pixels the current scroll position is from the top
		timer = setInterval(scrollUp, 5); //calls the function scrollUp once every 5 milliseconds until clearInterval is applied
	})
}

function scrollUp(){
	window.scrollBy(0, -scrollSpeed); //Scrolls up by the number of pixes specified by scrollSpeed
	fromTop -= scrollSpeed; //Updates fromTop to the current position
	if (fromTop <= 0) {
		clearInterval(timer);
	} //stops scrolling when top is reached
}

function scrollDown(){
	window.scrollBy(0, scrollSpeed); //Scrolls down by the number of pixes specified by scrollSpeed
	fromTop += scrollSpeed; //Updates fromTop to the current position
	if (fromTop >= vOffset) {
		clearInterval(timer);
	} //stops scrolling when selected element is reached

}


            
          
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