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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';

How to open 2 different modals with 2 different buttons

I have the following code and i am trying to open 2 different modals in each separate link.
modal link 1 -> open modal1
modal link 2 -> open modal2
<p data-height="265" data-theme-id="0" data-slug-hash="gWKOmP" data-default-tab="css,result" data-user="pansotdev" data-embed-version="2" data-pen-title="2 modals" class="codepen">See the Pen 2 modals by Sotiris Panagopoulos (#pansotdev) on CodePen.</p>
<script async src="https://production-assets.codepen.io/assets/embed/ei.js"></script>

https://codepen.io/anon/pen/OGdXXr
I correct your code I will let you play with the last function cos you have to determine exactly where we must click (which element) to close your modals.
also, one ID must be unique you can have the same id on a different element.
as you look beginner I think, it is the easier way I could make for you.
if you need more explanation let me know.
if the link doesn't work,
your HTML corrected:
<!-- The 1st button -->
<a id="myBtn1" href="#" class="copy_code" rel="nofollow">open modal 1</a>
<!-- The 2nd button -->
<a id="myBtn2" href="#" rel="nofollow">open modal 2</a>
<!-- The 1st Modal -->
<div id="myModal1" class="modal">
<!-- Modal content -->
<div class="modal-content">
<div class="modal-header">
<span class="close">×</span>
<h1 class="page-title">modal1</h1>
</div>
<div class="modal-body">
</div>
<div class="modal-footer">
</div>
</div>
</div>
<!-- The 2nd Modal -->
<div id="myModal2" class="modal">
<!-- Modal content -->
<div class="modal-content">
<div class="modal-header">
<span class="close">×</span>
<h1 class="page-title">modal2</h1>
</div>
<div class="modal-body">
</div>
<div class="modal-footer">
</div>
</div>
</div>
then your JavaScript corrected:
// Get the modal
var modal1 = document.getElementById('myModal1');
var modal2 = document.getElementById('myModal2');
// Get the button that opens the modal
var btn1 = document.getElementById("myBtn1");
var btn2 = document.getElementById("myBtn2");
// Get the <span> element that closes the modal
var span1 = document.getElementsByClassName("close")[0];
var span2 = document.getElementsByClassName("close")[1];
// set modal as hidden
modal1.hidden = true;
modal2.hidden = true;
// When the user clicks the button, open the modal
btn1.onclick = () => {
return modal1.hidden = false;
}
btn2.onclick = () => {
return modal2.hidden = false;
}
// When the user clicks on <span> (x), close the modal
span1.onclick = () => {
return modal1.hidden = true;
}
span2.onclick = () => {
return modal2.hidden = true;
}
// When the user clicks anywhere outside of the modal, close it //that's the logic
window.onclick = (event) =>{
if(modal1 || modal2 != false){
return modal1 && modal2 == true
}
}
see ya

Stop webpage in iframe from reloading on postback

How do I prevent a webpage in an Iframe from reloading when the parent page does a postback?
Below is a simple .aspx page. When I click Button1, which does a postback, the iframe that has blank.aspx as its source is reloaded. How can I prevent this from happening? Code is below.
<div>
This is an empty page with a button to open a modal window in an iframe
<asp:Button ID="Button1" runat="server" Text="Postback" OnClick="Button1_Click" />
<asp:Label ID="lblPostback" runat="server" Text="Initial Load"></asp:Label>
<!-- Trigger/Open The Modal -->
<button id="myBtn" type="button">Open Modal</button>
<!-- The Modal -->
<div id="myModal" class="modal">
<!-- Modal content -->
<div class="modal-content">
<span class="close">×</span>
<p>Some text in the Modal..</p>
<iframe src="Site/Public/blank.aspx"></iframe>
</div>
</div>
<script>
// Get the modal
var modal = document.getElementById('myModal');
// Get the button that opens the modal
var btn = document.getElementById("myBtn");
// Get the <span> element that closes the modal
var span = document.getElementsByClassName("close")[0];
// When the user clicks on the button, open the modal
btn.onclick = function () {
modal.style.display = "block";
}
// When the user clicks on <span> (x), close the modal
span.onclick = function () {
modal.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";
}
}
</script>
</div>

You could wrap the elements that will change during the postback inside an UpdatePanel. Providing the iframe is then outside of the UpdatePanel, it should not reload when posting back.

Multiple Modal Boxes overwritten

I have a problem of a simple yet confusing matter. I have two modal boxes with two separate Id's in my page. It's a simple registration and login ones. Thinking behind it was that if I use the same code yet change the id to target them individually would make things work the way I wish them to would do the job yet whenever I modify the content it appears to be identical in both of them. I have a little suspicion of where things are going wrong yet I need some guidance. Please help a girl out.
HTML
<!-- The Modal 1-->
<div id="myModal" class="modal">
<!-- Modal content 1 -->
<div class="modal-content">
<span class="close">×</span>
<p>Registration FORM WILL GO HERE..</p>
</div>
</div>
<!-- The Modal 2-->
<div id="myModal2" class="modal">
<!-- Modal content 2 -->
<div class="modal-content">
<span class="close">×</span>
<p>LOGIN FORM WILL GO HERE..</p>
</div>
</div>
SCRIPT
<script>
// Get the modal
var modal = document.getElementById('myModal');
// Get the button that opens the modal
var btn = document.getElementById("myBtn");
// Get the <span> element that closes the modal
var span = document.getElementsByClassName("close")[0];
// When the user clicks the button, open the modal
btn.onclick = function() {
modal.style.display = "block";
}
// When the user clicks on <span> (x), close the modal
span.onclick = function() {
modal.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";
}
}
</script>
<script>
// Get the modal
var modal = document.getElementById('myModal2');
// Get the button that opens the modal
var btn = document.getElementById("myBtnn");
// Get the <span> element that closes the modal
var span = document.getElementsByClassName("close")[0];
// When the user clicks the button, open the modal
btn.onclick = function() {
modal.style.display = "block";
}
// When the user clicks on <span> (x), close the modal
span.onclick = function() {
modal.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";
}
}
</script>

Modal Popup with Video, Keeps Playing Audio after Closed

I made a pop-up video button on my website.
But when i close it, or click on a modal-out space, the audio still continues.
How can i solve this problem?
I tried some javascript function, but i think im doing something wrong...
Thanks!
// Get the modal
var modal = document.getElementById('myModal');
// Get the button that opens the modal
var btn = document.getElementById("myBtn");
// Get the <span> element that closes the modal
var span = document.getElementsByClassName("close")[0];
// When the user clicks the button, open the modal
btn.onclick = function() {
modal.style.display = "block";
}
// When the user clicks on <span> (x), close the modal
span.onclick = function() {
modal.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";
}
}
<button type="button" class="button" id="myBtn">Watch Video</button>
<div id="myModal" class="modal">
<!-- Modal content -->
<div class="modal-content">
<div class="modal-header">
<span class="close">×</span>
</div>
<div class="modal-body">
<iframe width="560" height="315" src="https://www.youtube.com/embed/QH2-TGUlwu4" frameborder="0" allowfullscreen></iframe>
</div>
<div class="modal-footer">
</div>
</div>
</div>

Well the easiest way for you is to re-assign the iframe video src value so that it resets itself and stops. E.g. Assign your iframe an id of example id="yplayer" and then use the following statement where you want to stop and reload the video.
document.getElementById('yplayer').src = document.getElementById('yplayer').src;
The second option is to use the youtube api functions which will involve a little more code handling. Youtube API Docs
Hope this helps.

You should check out the documentation for html audio/video on https://www.w3schools.com/tags/av_met_pause.asp
I suggest you change
span.onclick = function() {
modal.style.display = "none";
}
with the following code
span.onclick = function stopVideo() {
document.getElementById('video').pause();
}