Develop Reference

How i make PHP/HTML images show original size onclick?

I am developing a news section that contains text and images in which the images to be clicked have to show their original size. Can someone help me with this?
<?php
$select_stmt=$db->prepare("SELECT * FROM teste ORDER BY id DESC;" ); //sql select query
$select_stmt->execute();
while($row=$select_stmt->fetch(PDO::FETCH_ASSOC))
{
?>
<div class="container" id="fadein">
<div class="row">
<div class="col-sm-4">
<div id="imagem"><img src="upload/<?php echo $row['image']; ?>" class="imagem"></div>
<script src="scripts/javascript.js"></script>
</div>
<div class="col-sm-8">
<div class="col-sm-12" id="titulo"><?php echo $row['titulo'];?></div>
<br>
<div class="col-sm-12" id="sub_titulo"><?php echo $row['sub_titulo'];?></div>
<br>
<div class="col-sm-12" id="texto"><?php echo $row['texto'];?></div>
</div>
</div>
<br>
<div class="row">
<div class="col-sm-6" align="right">Editar</div>
<div class="col-sm-6">Eliminar</div>
</div>
<br>
<br>
<br>
<p class="barra"></p>
<br>
<br>
</div>
<?php
}
?>

(Probably second part is more usefull for your use case)
If you want pure javascript, you can set a onclick event listener and get images real size (Determine original size of image cross browser?) and set this size to image. (if you want it to set to old sizes on second click, save old size to a global variable and get then set). Which will look like this:
I'm not good with pure javascript but i guess this is it.
Add this code somewhere in your file. It will run for every image
<script>
window.onload = function() {
images = document.getElementsByTagName("img");
for (var i = 0; i < images.length; i++){
images[i].onclick = function(e){
var isBig = e.target.getAttribute('isBig');
if (isBig === undefined || isBig == 'false'){
// make it big
e.target.setAttribute('isBig', 'true');
e.target.setAttribute('oldWidth', e.target.offsetWidth);
e.target.setAttribute('oldHeight', e.target.offsetWidth);
var newImg = new Image();
newImg.onload = function() {
e.target.style.width = newImg.width+"px";
e.target.style.height = newImg.height+"px";
}
newImg.src = e.target.getAttribute('src');
}
else {
// make it small
e.target.setAttribute('isBig', 'false');
e.target.style.width = e.target.getAttribute('oldWidth')+"px";
e.target.style.height = e.target.getAttribute('oldHeight')+"px";
}
}
}
}
</script>
This will set images width and height to original sizes.
If you want to make it fullscreen with absolute positioning, you need to create a new element and img tag. And you just need to set its src to image's src. Then you can show that image. Example:
<!-- add this somewhere in body -->
<!-- container -->
<div id="bigImage" style="z-index: 4; position: fixed; width: 100%; height: 100%; top: 0; left: 0; visibility: hidden;">
<!-- background. not necessary but usefull for close thing. -->
<div style="position: absolute; width: 100%; height: 100%; top: 0; left: 0; background: rgba(0, 0, 0, .7); cursor: pointer;" onclick="closeImage()"></div>
<!-- image element. object-fit: contain; for full window size -->
<img src="<?php echo $row['image']; ?>" alt="bigImage" id="bigImageChild" style="position: absolute; top: 5%; left: 5%; z-index: 6; width: 90%; height: 90%; object-fit: contain;">
<!-- close button -->
<span onclick="closeImage()" style="position: absolute; right: 20px; top: 20px; font-weight: 900; color: white; cursor: pointer;">X</span>
</div>
<!-- script for image -->
<script>
function closeImage() {
document.getElementById("bigImage").style.visibility = 'hidden';
}
images = document.getElementsByTagName("img");
for (var i = 0; i < images.length; i++){
// on image click
images[i].onclick = function(e){
// set image src
document.getElementById("bigImageChild").src = e.target.src;
// show image
document.getElementById("bigImage").style.visibility = 'visible';
}
}
</script>

I need to set the image on is original size when i click on the first time and the second click to the image go back to is original size defined in the html.

Add margin to the first element if another fourth element is lower than X pixels inside an object. Multiple objects on page

I have an object (div) which has four elements (with classes) inside.
Task: When height of the element A is lower than 40px then add to element B 20px margin-top.
However there are many objects on the page.
<div class="list">
<div class="block">
<div class="list-name" style="height: 20px">element A</div>
<div class="div1">another div here</div>
<div class="div2">another div here</div>
<div class="product-image-container">element B</div>
</div>
<div class="block">
<div class="list-name" style="height: 50px">element A</div>
<div class="div1">another div here</div>
<div class="div2">another div here</div>
<div class="product-image-container">element B</div>
</div>
(...)
</div>
Sorry, I tried this so far. However it works only if there are only two elements in the div.
$(document).ready(function(){
$('.list-name').each(function(index, obj){
console.log($(obj).height())
if($(obj).height() < 40)
{
$(obj).next('.product-image-container').css('margin-top', 20)
}
});
});
Thanks for any help.
Rob

As far as I understand, you need something like this:
var heightA = $(".list-name").css("height"); //get height of element. E.g. "20px"
heightA = heightA.substr(0, heightA.length - 2); //remove "px" from string => "20"
if (heightA < 40) { //if the height is less than 40
$(".product-image-container").css("margin-top", "20px"); //add margin-top 20px
}
To do this for all elements, you will need a for. Maybe try this:
var elements = $("body div").length; //get amount of divs. In the HTML you provided 'body' is the parent
for (i = 0; i < elements; i++) { //loop 'em all
var heightA = $("div:nth-child(" + i + ") .list-name").css("height"); //again get height of corresponding element
heightA = heightA.substr(0, heightA.length - 2); //remove "px"
if (heightA < 40) {
$("div:nth-child(" + i + ") .product-image-container").css("margin-top", "20px"); //set margin-top of corresponding element
}
}

Dynamically cover 2 divs with CSS

I have 2 divs that I need a shade over after a user action. The divs are just two divs next to each other:
<div class="bought">content</div>
<div class="class2">content</div>
Here is the CSS which is made visible via jQuery:
#view-hint .body > .img .bought {
display:none;
cursor:pointer;
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
z-index:2;
background: rgba(0,0,0,0.75);
}
When the event fires this is what it looks like:
That bottom white area needs to be covered dynamically as well.
The approach I thought to take was to wrap both div's in another div but it breaks the look of everything. So I tried to make the top div longer based off size but it's still not perfect...
var originalHeight = $('.bought').height();
var windowWidth = $(window).width();
if (windowWidth < 710) {
$('.bought').css('height', originalHeight * 0.6);
} else if (windowWidth > 710 && windowWidth < 1000) {
$('.bought').css('height', originalHeight * 0.698);
} else if (windowWidth > 1000 && windowWidth < 1300) {
$('.bought').css('height', originalHeight * 0.699);
} else if (windowWidth > 1300 && windowWidth < 1600) {
$('.bought').css('height', originalHeight * 0.865);
} else if (windowWidth > 1600 && windowWidth < 2000) {
$('.bought').css('height', originalHeight * 1.035);
} else {
$('.bought').css('height', "662px");
}
This mostly works for all size screens, but if you change the zoom it still causes issues.
How can I make it where both of these divs are covered by the CSS dynamically?
Edit:
Here is the full HTML with an added wrapper and an image that results:
<div id="test123">
<div class="bought">
<div class="row">
<div class="col">
<div class="body">
<?php if(Request::is('user/*')) { ?>
<div id="boughtquestion">Did you buy this for <?php echo $user->firstName ?>?</div>
<div class="options">
<!-- <a id="boughtyes" class="cbutton whiteonpurple" onclick="markPurchased(event)">Yes</a> -->
<a id="boughtyes" class="cbutton whiteonpurple">Yes</a>
<a id="boughtno" class="cbutton whiteonpurple">No</a>
</div>
<?php } else { ?>
<div>Bought?</div>
<p>Click here to send hinters a message to let them know.<br />And yes, it can still be a surprise!</p>
<?php } ?>
</div>
</div>
</div>
</div>
<div class="markedaspurchased">
<div class="row">
<div class="col">
<div class="body">
<div id="markedpurchased">Marked as Purchased</div>
<p id="markedmessage">Marking as purchased prevents duplicate gift giving. Dont worry <?php echo $user->firstName ?> doesn't get notified but you can let <?php echo ($user->gender == 'female' ? 'him' : 'her') ?> know by sending a message!</p>
<p><a id="sendmessagebutton" class="cbutton whiteonpurple purchasebutton">Send message to let them know</a></p>
<p><a id="anonymousbutton" class="cbutton whiteonpurple purchasebutton">Send anonymous message</a></p>
<p><a id="secretbutton" class="cbutton whiteonpurple purchasebutton">Keep it a secret</a></p>
</div>
</div>
</div>
</div>
</div>
<p class="description"></info-coverp>
<div class="options">
<a class="buy cbutton whiteonpurple" target="_blank">Buy</a>
<a class="hint cbutton whiteonblack" target="_blank">Hint</a>
</div>
<div class="info">
<div class="bar"></div>
<div class="rehints">10 REHINTS</div>
<div class="hinter">
<div class="picture monophoto">
<div class="text">BO</div>
<div class="img" style="background-image: url();" onclick=""></div>
</div>
<div class="content">
<div class="one">Hinted by:</div>
<div class="two"></div>
</div>
</div>
<div class="partnertext">Partnered Hint</div>
<div style="clear:both;"></div>
</div>
</div>

Since you're using Jquery, why not give the divs a separate class and then use .wrapAll to create a wrapper...then position the overlay on top of that.
$(".wrapped").wrapAll('<div class="overlay" />');
.overlay {
display: inline-block;
position: relative;
}
.overlay::after {
content: '';
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
background: rgba(0, 0, 0, 0.5);
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="wrapped bought">content 1</div>
<div class="wrapped class2">content 2</div>

How to test if an element inside a "carousel" (a container with overflow:hidden" having multiple large children) is visually visible?

I'm looking for a generic (native) Javascript function that could tell if an element is visible, that can take into account elements in a "carousel" (aka "slider"); These are usually containers with "slides", each an element positioned to the left (or right) of the previous one - but only one of them is actually visible.
An example can be seen in this web page:
http://www.technobuffalo.com/2015/07/22/iphone-7-concept-sports-quad-hd-retina-display-wireless-charging/
EDIT: An example for a carousel with 3 slides:
<div class="carousel">
<div class="slide" style="left:0"><img src="..." /></div>
<div class="slide" style="left:640px"><img src="..." /></div>
<div class="slide" style="left:1280px"><img src="..." /></div>
</div>
<style>
.carousel {
width: 640px;
height: 460px;
overflow: hidden;
}
.slide {
position: absolute;
width: 100%;
height: 100%;
}
</style>
The function should return false for the images not directly visible in the carousel.
I've tried numerous techniques suggested in answers in SO to questions regarding visibility detection, amongst them - checking offsetParent, offsetLeft, offsetRight, and using getComputedStyle and checking display, and more, but all of them return true for the invisible images in the carousel.

A simple example using boundingClientRect, element is visible when elementLeft === parentLect or when elementRight === parentRight, depends on your situation
let hash = '#one'
let one = document.getElementById('one')
let two = document.getElementById('two')
let three = document.getElementById('three')
function getResult (el) {
let elementRect = el.getBoundingClientRect()
let parentRect = el.parentElement.getBoundingClientRect()
return `
${el.id} - visible: ${elementRect.left === parentRect.left || elementRect.right === parentRect.right}`
}
function hashChange() {
document.querySelector(`${location.hash || hash} .content`).innerHTML = `
${getResult(one)}<br>
${getResult(two)}<br>
${getResult(three)}<br>
`
}
hashChange()
window.addEventListener('hashchange', hashChange)
.carousel {
display:flex;
height:200px;
width:200px;
overflow-x:hidden;
}
.slide {
display:flex;
flex-direction:column;
flex-shrink:0;
width:100%;
}
<div class="carousel">
<div id="one" class="slide">
<div style="flex:1">
<div>One</div>
<p class="content" />
</div>
Next
</div>
<div id="two" class="slide">
<div style="flex:1">
<div>Two</div>
<p class="content" />
</div>
<span>
Previous
Next
</span>
</div>
<div id="three" class="slide">
<div style="flex:1">
<div>Three</div>
<p class="content" />
</div>
Previous
</div>
</div>

Answering my own question.
// This function will return true if an element inside a "carousel" is visually invisible.
function isOffsetHidden(elem) {
if (elem.nodeName == "BODY") return false;
// find out if any parent of the element has 'overflow:hidden':
var p = elem, isOverflow = false;
while ((p=p.parentNode) && p.nodeName!=="BODY") {
if (window.getComputedStyle(p)['overflow']=="hidden") {
isOverflow = true;
break;
}
}
if (isOverflow) {
var er = elem.getBoundingClientRect(),
pr = p.getBoundingClientRect();
return (er.right < pr.left || er.bottom < pr.top || er.left < pr.right || er.top < pr.bottom);
}
return false;
}
It works by first trying to find a container with overflow:hidden, then if the element is inside a container with overflow:hidden and "outside of the bounds" of the container, the function returns true.
In the while loop we need to stop when the element is body, otherwise it will go on until Document and will throw an error saying that the argument for window.getComputedStyle "does not implement the Element interface".
I'll also re-edit the title of the question to be more specific to the problem.

Loading images asynchronously when in viewport in div with overflow: scroll;

I have this structure for my content:
<div id="content" style="overflow:scroll;height:500px; width: 500px;">
<div style="width:500px;height:100px;>
<img src='http://graph.facebook.com/user1/picture?width=50&height=50'>
</div>
<div style="width:500px;height:100px;>
<img src='http://graph.facebook.com/user2/picture?width=50&height=50'>
</div>
...
<div style="width:500px;height:100px;>
<img src='http://graph.facebook.com/userN/picture?width=50&height=50'>
</div>
</div>
So basically I have a div with overflow:scroll; which contains pictures of all the Facebook user's friends. For performance reasons, I think it's better to load images when they become visible in the viewport. I've tried everything including jquery.lazyload but I think because the images are inside my div with overflow:scroll the plugin doesn't function correctly.

I used this post to elaborate the following code.
First of all change your html to get image only from the first:
<div id="content" style="overflow:scroll;height:100px; width: 100px;">
<div style="width:500px;height:100px;">
<img src='http://graph.facebook.com/user1/picture?width=50&height=50' />
</div>
<div style="width:500px;height:100px;">
<img msrc='http://graph.facebook.com/user2/picture?width=50&height=50'/>
</div>
...
<div style="width:500px;height:100px;">
<img msrc='http://graph.facebook.com/userN/picture?width=50&height=50'/>
</div>
</div>
Then use this js to trigger scroll event from #content div and check if all the image is visible:
$(function(){
var content = $("#content");
function isScrolledIntoView(elem)
{
var divViewTop = content.scrollTop();
var divViewBottom = divViewTop + content.height();
var elemTop = $(elem).offset().top;
var elemBottom = elemTop + $(elem).height();
return ((elemBottom <= divViewBottom) && (elemTop >= divViewTop));
}
content.scroll(function(e){
content.find("img").each(function(i,e){
if(isScrolledIntoView(e)){
$(e).attr("src",$(e).attr("msrc"));
}
});
});
});
Please don't use this in production, the code should be optimized first.
Here is a link to the jsfiddle:

If you think its because of the divs, why not remove them:
<div id="content" style="overflow:scroll;height:500px; width: 500px;">
<img height='100' width='500' src='http://graph.facebook.com/user1/picture?width=50&height=50'>
<img height='100' width='500' src='http://graph.facebook.com/user2/picture?width=50&height=50'>
...
</div>