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Text appear/disappear on top of image with button toggle

In mobile, I'm trying to create a toggle that appears on top of an image, that when tapped on, makes text appear on top of the image too.
I basically want to recreate how The Guardian newspaper handles the little (i) icon in the bottom right corner on mobile.
And on desktop, the the text is there by default under the image and the (i) icon is gone.
So far I've managed to find a similar solution elsewhere online but it's not quite working right as I need it to.
function toggleText() {
var text = document.getElementById("demo");
if (text.style.display === "none") {
text.style.display = "block";
} else {
text.style.display = "none";
}
}
#blog {
width: 100%;
}
#blog figure {
position: relative;
}
#blog figure figcaption {
display: none;
position: absolute;
bottom: 0;
left: 0;
box-sizing: border-box;
width: 100%;
color: black;
text-align: left;
background: rgba(0, 0, 0, 0.5);
}
#blog figure button {
position: absolute;
bottom: 0;
right: 0;
color: black;
border: 5px solid black;
}
<div id="blog">
<figure>
<img src="https://cdn2.hubspot.net/hubfs/4635813/marble-around-the-world.jpg" alt="A photo of a slab of marble for example">
<figcaption id="demo" style='display: none'>A photo of a slab of marble for example</figcaption>
<button type='button' onclick="toggleText()">(i)</button>
</figure>
</div>

Don't use IDs. Your code should be reusable!
Don't use inline JS on* handlers, use Element.addEventListener() instead
Don't use inline style attributes.
Don't use el.style.display === "something" to check for display styles. Use Element.classList.toggle() instead
This straightforward example uses JavaScript to simply toggle a className "is-active" on the button's parent, the figure Element.
Everything else (icon symbol change, caption animation etc...) is handled purely by CSS:
document.querySelectorAll("figure button").forEach(EL_btn => {
EL_btn.addEventListener("click", () => {
EL_btn.closest("figure").classList.toggle("is-active");
});
});
/* QuickReset */ * {margin: 0; box-sizing: border-box;}
img {
max-width: 100%; /* Never extend images more than available */
}
figure {
position: relative;
overflow: hidden; /* overflow hidden to allow figcaption hide bottom */
}
figure img {
display: block; /* prevent "bottom space" caused by inline elements */
}
figure figcaption {
position: absolute;
width: 100%;
bottom: 0;
padding: 1rem;
padding-right: 4rem; /* Prevent text going under the button icon */
color: #fff;
background: rgba(0, 0, 0, 0.5);
transform: translateY(100%); /* Move down, out of view */
transition: transform 0.3s; /* Add some transition animation */
}
figure.is-active figcaption {
transform: translateY(0%); /* Move into view */
}
figure button {
position: absolute;
width: 2rem;
height: 2rem;
bottom: 0.5rem;
right: 0.5rem;
border-radius: 50%;
color: #fff;
background: rgba(0, 0, 0, 0.5);
border: 0;
cursor: pointer;
}
figure button::before {
content: "\2139"; /* i icon */
}
figure.is-active button::before {
content: "\2A09"; /* x icon */
}
<figure>
<img src="https://cdn2.hubspot.net/hubfs/4635813/marble-around-the-world.jpg" alt="A photo of a slab of marble for example">
<figcaption>A photo of a slab of marble for example</figcaption>
<button type="button"></button>
</figure>
The above will work for any number of such elements on your website without the need to add any more CSS or JS.

I see a couple things that could mess this up, one is the fact that there is nothing to make your image adjust to your mobile screen, more-over there is also margin that is there by default, so I suggest these changes to the CSS:
First I'd set box-sizing to border-box and margin to 0, this should be a regular practice by the way.
*{
box-sizing: border-box;
margin: 0;
}
Then select the image and make it adjust to your page as such
#blog figure img{
height: auto;
width:100%;
}
Finally, for some styling you can add some padding to your blog div to make the image slightly smaller on your screen
#blog {
width: 100%;
padding: 35px;
}
This is the Fiddle for it.

how to change css when user scrolls to bottom of page

i currently have a div that appears fixed after scrolling. i want that div to to remain visible but not fixed once the user reaches the bottom of the page..
this is what i have so far:
var topOfOthDiv = 800; //set manually for example
$(window).scroll(function() {
if ($(window).scrollTop() > topOfOthDiv) { //scrolled past the other div?
$("#ctawrapper.ctaFloat").addClass('show'); //reached the desired point -- show div
} else {
$("#ctawrapper.ctaFloat").removeClass('show'); //reached the desired point -- hide div
}
});
#ctawrapper.ctaFloat {
position: fixed;
bottom: 0;
height: auto;
max-height: 100px;
width: 90%;
display: none;
}
#ctawrapper.show {
background: #fff;
width: 100%;
z-index: 999;
left: 0px;
padding: 15px;
border: 1px solid #ddd;
display: block!important;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="ctawrapper" class="clearfix ctaFloat">
<h4>sponsored topics</h4>
</div>
everything i have tried to do to add a new class or change the css once it reaches the footer have failed. can i get some help please?

Navbar with fixed position staying on the top while header disappear

I want to make navbar with fixed position. At the top of the page the navbar should be under the header and after scrolling down when header is no longer visible the navbar should be at the top of the page. How can I do that? When I try to do it after scrolling down between the navbar and top of the page is still the height of the header(even though it is no longer visible).
Here is my css:
header{
background-color: red;
width: 100%;
height: 100px;
}
nav{
position: fixed;
float:left;
height: 100px;
width: 100px;
margin-left: 10px;
margin-right: 50px;
margin-top:50px;
background-color: green;
}
main{
background-color: blue;
height: 1500px;
margin-left:15%;
margin-right:5%;
margin-top:50px;
}
and jfiddle: https://jsfiddle.net/pg2kwk5e/

You can add a class to the nav element with javascript after scrolling a certain amount.
I've used Jquery as it's faster and easier to show this in action.
Example
I'm just adding a class .fixedTop to the nav after the window scrolls more than 150 pixels, the class itself just has top:0;margin0; to move the absolute positioned element to the top and remove the margin which was set before.
Code:
var $nav = $("nav"),
$(window).scroll(function() {
if($(this).scrollTop() > 150) {
$nav.addClass('fixedTop');
} else {
$nav.removeClass('fixedTop');
}
})
CSS:
.fixedTop {
top: 0;
margin: 0 !important;
}

How can I prevent this jquery text panel from sliding top to bottom the first time it's hovered?

When the page is first loaded, and the image is hovered over for the first time, the sliding panel slides down from the top to the bottom. But ever time you hover over it after that, it slides up from the bottom - which is what I want. I don't want it to slide down from the top the first time it's hovered over. Is there any way to make it just slide up every time it's hovered over? I'm sure there's some simple solution but I'm not very familiar with javascript.
<div class="boxgrid captionfull">
<img src="http://s17.postimage.org/arxuilf9r/jareck.jpg"/>
<div class="cover boxcaption">
<h3>Jarek Kubicki</h3>
<p>Artist<br/>http://www.nonsensesociety.com/2009/03/art-by-jarek-kubicki/" target="_BLANK">More Work</a></p>
</div>
.boxgrid{
width: 325px;
height: 260px;
margin:10px;
float:left;
background:#161613;
border: solid 2px #8399AF;
overflow: hidden;
position: relative;
}
.boxgrid img{
position: absolute;
top: 0;
left: 0;
border: 0;
}
.boxcaption{
float: left;
position: absolute;
background: #000;
height: 100px;
width: 100%;
opacity: .8;
/* For IE 5-7 */
filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=80);
/* For IE 8 */
-MS-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=80)";
}
.captionfull .boxcaption {
top: 260;
left: 0;
}
$(document).ready(function(){
$('.cover').hide();
$('.boxgrid.captionfull').hover(function(){
$(".cover", this).stop().animate({top:'160px'},{queue:false,duration:160}).show();
}, function() {
$(".cover", this).stop().animate({top:'260px'},{queue:false,duration:160});
});
});
http://jsfiddle.net/scottm29/NUpfz/1/

Define a startup css to your element:
Here is jsFiddle.
.boxcaption{
...
top:260px;
}

Detecting clicked horizontal position in a div

When i click on streaming bar, position will be detected from left edge of the browser window but it has to be detected from left edge of the #progressBar div in this demo. So, because of positioning #progressBar div with left: 200px; 200px is added on horizontal position that is clicked.
My simple detecting function:
function point_it(e){
var x=e.clientX;
var seekSecond = Math.floor((x/1100) * ytplayer.getDuration()); //1100 is width of the progress bar
seekTo(seekSecond);
document.getElementById("xPos").innerHTML=x;
}
style:
#progressBar{
position: relative;
top: 400px;
left: 200px;
width: 1100px;
height: 4px;
border: 2px solid gray;
margin: 10px;
z-index: 8;
}
#elapsedBar{
position: relative;
top: -1px;
width:0px;
height:3px;
border:1px solid;
border-color: #660033;
background-color: #660033;
margin:0px;
z-index: 10;
}
#loadedBar{
position: relative;
top: 0px;
width: 0px;
height:4px;
border:1px solid;
border-color: gray;
background-color: gray;
margin:0px;
z-index: 9;
}

You can subtract the left position from the clicked position, I only know the jQuery way of doing this:
// Get the "left" value
var leftPos = $("#progressBar").css("left");
// Remove "px"
var leftPos = leftPos.replace("px", "");
Then subtract leftPos from the value you are getting

Just use e.offsetX in your function instead of e.clientX.
e.client... is related to the browsers window, e.offsett... is related to the clicked target element.

You have to subtract 10 from x because of margin: 10px;. This causes var x=e.clientX; to be 10 when clicking on the left side of the bar.