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Select Multiple Elements for Image Modal

I want to use a selector to select every image on the page for putting into the modal without rewriting the entire script for each image. I feel like this a is a dumb question but I keep striking out trying different things. Right now I'm using var img = document.getElementById("article01"); to select one image because that's all you can do with getElementById. So I want to select both the images listed so that I'm not rewriting the entire script for each image because there will be many more on the page. I tried using getelementbyclass and tagname but I think I'm stuck.
HTML:
<!-- Trigger the Modal -->
<img id="article01" src="/images/article1.PNG" alt="" style="width:100%;max-width:300px">
<img id="article01-2" src="/images/article1-2.PNG" alt="" style="width:100%;max-width:300px">
<!-- The Modal -->
<div id="modal1" class="modal">
<!-- The Close Button -->
<span class="close">×</span>
<!-- Modal Content (The Image) -->
<img class="modal-content" id="img01">
<!-- Modal Caption (Image Text) -->
<div id="caption"></div>
</div>
Javascript:
<script>
// Get the modal
var modal = document.getElementById("modal1");
*var img = document.getElementById("article01");*
var modalImg = document.getElementById("img01");
var captionText = document.getElementById("caption");
img.onclick = function() {
modal.style.display = "block";
modalImg.src = this.src;
captionText.innerHTML = this.alt;
}
// Get the <span> element that closes the modal
var span = document.getElementsByClassName("close")[0];
// When the user clicks on <span> (x), close the modal
span.onclick = function() {
modal.style.display = "none";
}
</script>

You can use document.querySelectorAll() to get a nodeList of all of the images. For example, if you created your list of images as such:
<img class="selectable" src="article-1" />
<img class="selectable" src="article-2" />
<img class="selectable" src="article-2" />
You can add an event listener to each using ...
document.querySelectorAll('img.selectable')
.forEach((img) => {
img.addEventListener('click', (e) => showModal(e.target)); //or use img.onclick = ...
});
Here is a link to a CodePen showing a demo of how to do this...

Here's what i got from your post. I think what you are looking for is document.querySelector()
<!-- Trigger the Modal -->
<img alt="this is a caption" src="https://livebrooks.com/wp-content/uploads/2017/07/fpo.gif" style="width:100%;max-width:300px">
<img alt="this is the second caption" src="https://livebrooks.com/wp-content/uploads/2017/07/fpo.gif" style="width:100%;max-width:300px">
<!-- The Modal -->
<div id="modalWrap" class="modal">
<!-- The Close Button -->
<span class="close" onclick="document.querySelector('#modalWrap').remove()">×</span>
</div>
for (var i of document.querySelectorAll("img")) {
makeModal(i.src, i.getAttribute("alt"));
}
function makeModal(src, caption) {
//modal wrap
var modalWrap = document.querySelector("#modalWrap");
//img
var imgElement = document.createElement("img");
imgElement.src = src;
imgElement.style.maxWidth = "300px";
//caption
var captionElement = document.createElement("p");
captionElement.innerText = caption;
//adding elements to modalWrap
modalWrap.appendChild(imgElement);
modalWrap.appendChild(captionElement);
}

Open multiple different iframes

I have in my site a lot of images and through each one, you can open a different iframe that includes an interactive ad that is related to the image from where you opened it.
The thing is that with the code that I´m using, I can only open the first iframe.
Here is a demo of my site and what I´m trying to do. You can see that if you click on the images, you will only me able to open the first iframe:
http://kickads.mobi/richmediagallery/index_test_iframe.html
I want to know if someone could help me to solve this.
The JS code that I´m using is this one:
<script>
// Get the modal
var modal = document.getElementById('MyModal');
// Get the button that opens the modal
var div = document.getElementById("myDiv");
// Get the button that opens the modal
var img = document.getElementById("myImg");
// Get the <span> element that closes the modal
var span = document.getElementsByClassName("close")[0];
// When the user clicks on the button, open the modal
div.onclick = function() {
modal.style.display = "block";
}
// When the user clicks on the button, open the modal
img.onclick = function() {
modal.style.display = "block";
}
// When the user clicks on <span> (x), close the modal
span.onclick = function() {
modal.style.display = "none";
}
var freezeVp = function(e) {
e.preventDefault();
};
</script>
And here is a demo of how the image opens the iframe:
<div id="ad1" class="portfolio-item deporte col-md-3">
<div class="portfolio-box">
<div class="portfolio-image-wrap">
<img id="myImg" src="img/portfolio/image.jpg" alt="" />
</div>
<div class="portfolio-caption-mask" id="myDiv">
<div class="portfolio-caption-text">
<div class="portfolio-caption-tb-cell">
<h5 class="alt-title">Puzzle ad</h5>
<p>Nike Made to fly</p>
</div>
</div>
</div>
</div>
</div>
<div id="MyModal" class="modal">
<span class="close">×</span>
<div class="contenido">
<iframe style="height: 480px; width: 320px" src="http://kickads.mobi/test/ad" frameborder="0"></iframe>
</div>
</div>

As it's been said you cannot call multiple elements using same IDs.
Two elements cannot have the same ID.
If you want to assign multiple elements in the same variable I recomend you to use : var div = document.getElementsByClassName("name");
More details here.

Modal with link

I use a modal I got from w3school and I modified it to put several modals on the same page.
I would like to know if I can make these modals generate their own links.
Example: I open modal 4 and the page link will change to mywebsite.com/modal4
The code I use is more or less like this
JS
// Get the modal
var modal = document.getElementsByClassName('modal');
// Get the button that opens the modal
var btn = document.getElementsByClassName("myBtn");
// Get the <span> element that closes the modal
var span = document.getElementsByClassName("close");
// When the user clicks the button, open the modal
btn[0].onclick = function() {
modal[0].style.display = "block";
}
btn[1].onclick = function() {
modal[1].style.display = "block";
}
// When the user clicks on <span> (x), close the modal
span[0].onclick = function() {
modal[0].style.display = "none";
}
span[1].onclick = function() {
modal[1].style.display = "none";
}
// When the user clicks anywhere outside of the modal, close it
window.onclick = function(event) {
if (event.target == modal) {
modal.style.display = "none";
}
}
HTML
<h2>Modal Example1</h2>
<!-- Trigger/Open The Modal -->
<button id="myBtn" class="myBtn">Open Modal1</button>
<!-- The Modal -->
<div id="myModal" class="modal">
<!-- Modal content -->
<div class="modal-content">
<span class="close">×</span>
<p>Some text in the Modal..1</p>
</div>
</div>
<h2>Modal Example2</h2>
<!-- Trigger/Open The Modal -->
<button id="myBtn" class="myBtn">Open Modal2</button>
<!-- The Modal -->
<div id="myModal2" class="modal">
<!-- Modal content -->
<div class="modal2-content">
<span class="close">×</span>
<p>Some text in the Modal..2</p>
</div>
</div>

You can change the current URL of the page when opening the modal, as seen in this answer: Modify the URL without reloading the page. To load the modal if you go to mywebsite.com/modal4, you can write some js logic to get the link, see if it addresses a modal, and then open that modal.
You may have to write some backend code to handle links like that, however, you can try to pass link parameters and then use js to parse the parameters out of the link string: How to get the value from the GET parameters?
As JagdeeshKumar pointed out below, you can also navigate to website.com/htmlpage.html#modal4, and you can use js to get that location and load up the modal. See https://www.w3schools.com/jsref/prop_loc_hash.asp

you can use
your URL will be like root/#modal4window.location.hash = 'something';

Make JavaScript onclick function open modal with image and caption

I currently have it so that onClick the modal opens ,but it does not display the image..
Here's the code
HTML
<div class="item">
<img src="Imgs/10.jpg" alt="Hello welcome to the picture thingy" onclick="showImage('Imgs/10.jpg');" style="width:100%;" id="myImg" />
<p class="xtratekst">
othertext
</p></div><div id="myModal" class="modal">
<!-- The Close Button -->
<span class="close" onclick="document.getElementById('myModal').style.display='none'">×</span>
!-- Modal Content (The Image) -->
<img class="modal-content" id="image">
<!-- Modal Caption (Image Text) -->
<div id="caption"></div>
</div>
JavaScript
// Get the modal
var modal = document.getElementById('myModal');
// Get the image and insert it inside the modal - use its "alt" text as a caption
var img = document.getElementById('myImg');
var modalImg = document.getElementById("image");
var captionText = document.getElementById("caption");
function showImage(){
modal.style.display = "block";
modalImg.src = this.src;
captionText.innerHTML = this.alt;
}
// Get the <span> element that closes the modal
var span = document.getElementsByClassName("close")[0];
// When the user clicks on <span> (x), close the modal
span.onclick = function() {
modal.style.display = "none";
}

You showImage function should take a parameter:
function showImage(image){
Then set the modal image src to that parameter:
modalImg.src = image

second modal button doesn't work

My second, third and so on buttons which open modal, doesn't work and I can't figure out the problem.
I think is a logic problem in my javascript code for sure, but I can't find a way to solve it ... maybe you can help me.
var modal = document.getElementById('myModal');
// Get the image and insert it inside the modal
var img = document.getElementById('myImg');
var modalImg = document.getElementById('img01');
var buton = document.getElementById('continut');
buton.onclick = function() {
modal.style.display = "block";
modalImg.src = img.src;
}
// Get the <span> element that closes the modal
var span = document.getElementsByClassName("close")[0];
//When the user clicks on <span> (X), close the modal
span.onclick = function() {
modal.style.display = "none";
}
You have a demonstration on jsfiddle
Thanks in advance !
https://jsfiddle.net/qschptk9/1/
I've got 2 negative votes, and NO ONE Helped me.
Ok i've Changed the ID's, but still doesn't work, because getElementsByClassName return an array of elements ...

id should be unique so you should't use it for 2 elements
you use the same id 2 times for many elemets (button, modal, img, modalimg)
you can change the id's for all those elements (hard coded option), or you can add a class for both and add click event for both but you will need to differentiate each modal and each img (you can do this by passing ids for these elements in a function)
Edit
this is an optimized solution that i would use for you want to do
I added only one modal and used onclick event for each button to pass the header text and the img id to a function that show the appropriate modal
here is the HTML
<div class="portfolio_content">
<div class="row" id="portfolio">
<div class="col-xs-12 col-sm-4 websites responsive webDesign">
<div class="portfolio_single_content">
<img id="myImg1" src="http://www.w3schools.com/css/img_fjords.jpg" alt="title" />
<div>
<!--Continut because from here we access the content of this preview photo-->
<div class="continut">
<p>Portfolio Website</p>
<button class="seeBtn" onclick="showModal('Portfolio Website','myImg1')">
button
</button>
</div>
</div>
</div>
</div>
<div class="col-xs-12 col-sm-4 appsDevelopment">
<div class="portfolio_single_content">
<img id="myImg2" src="http://www.w3schools.com/css/img_fjords.jpg" alt="title" />
<div>
<!--Continut because from here we access the content of this preview photo-->
<div class="continut">
<p>Pomodoro Clock</p>
<button class="seeBtn" onclick="showModal('Pomodoro Clock','myImg2')">
button
</button>
</div>
</div>
</div>
</div>
</div>
</div>
<!--The modal-->
<div class="modal" id="myModal">
<!-- Modal content -->
<div class="modal-content">
<!--Modal header-->
<div class="modal-header">
<span class="close" id="close">CLOSE X<i class="fa fa-times" aria-hidden="true"></i></span>
<h2 id="modal_h1"></h2>
</div>
<div class="modal-body">
<img class="modal-image" id="img01">
</div>
<div class="modal-footer">
<h3>External link</h3>
</div>
</div>
</div>
and here is the js code
var modal = document.getElementById('myModal');
var modalImg = document.getElementById('img01');
var modalHeaderTxt = document.getElementById('modal_h1');
function showModal(header_txt,img_id){
// Get the image and insert it inside the modal
var img = document.getElementById(img_id);
modalImg.src = img.src;
modalHeaderTxt.innerHTML = header_txt;
modal.style.display = "block";
}
// Get the <span> element that closes the modal
var span = document.getElementById("close");
//When the user clicks on <span> (X), close the modal
span.onclick = function() {
modal.style.display = "none";
}
Demo
and here is the hard coded option (i don't recommend it)
var modal = document.getElementById('myModal');
var modal2 = document.getElementById('myModal2');
// Get the image and insert it inside the modal
var img = document.getElementById('myImg');
var img2 = document.getElementById('myImg');
var modalImg = document.getElementById('img01');
var modalImg2 = document.getElementById('img02');
var buton = document.getElementById('continut');
var buton2 = document.getElementById('continut2');
buton.onclick = function() {
modal.style.display = "block";
modalImg.src = img.src;
}
buton2.onclick = function() {
modal2.style.display = "block";
modalImg2.src = img2.src;
}
// Get the <span> element that closes the modal
var span = document.getElementsByClassName("close")[0];
var span2 = document.getElementsByClassName("close")[1];
//When the user clicks on <span> (X), close the modal
span.onclick = function() {
modal.style.display = "none";
}
span2.onclick = function() {
modal2.style.display = "none";
}
Demo

You have two id's with same name hence first id will be picked everytime. The ids must be unique. Please try changing the id and it should work.
Or you can try to change it into class names and then work with classes

You need to change the id's for the models to classes. You can't assign multiple id's in HTML. That's why your code works only for one modal.
Change your id's to classes like this:
<div class="modal myModal">

i think you have more than one element that has id='myModal'
, in that case you should do:
var modal = document.getElementById('myModal')[correct element number]
example :
document.getElementById('myModal')[0] //for the first element
document.getElementById('myModal')[1] //for the second element
and so on...
for each button