html - How can I change a button Id-tag into class-tag and use getElementByClassName right? -

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i need button id several buttons thats why want change class-tag. if not work. not possible use elementbyclassname ?

<button class="mybtn">overlay</button>

so want change id-tag class-tag. tried change getelementbyid getelementbyclassname. unfortunatly not work.

in following have added example w3schools. working id-tag. 

<!doctype html> <html> <head> <style> /* overlay (background) */  .overlay { display: none; /* hidden default */ position: fixed; /* stay in place */ z-index: 1; /* sit on top */ left: 0; top: 0; width: 100%; /* full width */ height: 100%; /* full height */ overflow: auto; /* enable scroll if needed */ background-color: rgb(0,0,0); /* fallback color */ background-color: rgba(0,0,0,0.4); /* black w/ opacity */ -webkit-animation-name: fadein; /* fade in background */ -webkit-animation-duration: 0.4s; animation-name: fadein; animation-duration: 0.4s }   /* overlay content */  .overlay-content { position: fixed; bottom: 0; background-color: #fefefe; width: 100%; -webkit-animation-name: slidein; -webkit-animation-duration: 0.4s; animation-name: slidein; animation-duration: 0.4s }  /* close button */  .close { color: white; float: right; font-size: 28px; font-weight: bold; }  .close:hover, .close:focus { color: #000; text-decoration: none; cursor: pointer; }  .overlay-header { padding: 2px 16px; background-color: #5cb85c; color: white; }  .overlay-body {padding: 2px 16px;}  .overlay-footer { padding: 2px 16px; background-color: #5cb85c; color: white; }  /* add animation */  @-webkit-keyframes slidein { {bottom: -300px; opacity: 0}  {bottom: 0; opacity: 1} }  @keyframes slidein { {bottom: -300px; opacity: 0} {bottom: 0; opacity: 1} }  @-webkit-keyframes fadein {  {opacity: 0}  {opacity: 1} }  @keyframes fadein { {opacity: 0}  {opacity: 1} } </style> </head> <body>  <h2>overlay</h2>   <!-- trigger/open overlay -->  <button id="mybtn">overlay</button>   <!-- overlay -->  <div id="overlay" class="overlay">   <!-- overlay content -->  <div class="overlay-content">  <div class="overlay-header">   <span class="close">&times;</span>   <h2>container</h2>  </div>  <div class="overlay-body">   <p>container information</p>   <p>some other text...</p>  </div>  <div class="overlay-footer">   <h3>footer</h3>  </div>  </div>   </div>   <script> // overlay  var overlay = document.getelementbyid('overlay');  // button opens overlay  var btn = document.getelementbyid("mybtn");  // <span> element closes overlay  var span = document.getelementsbyclassname("close")[0];  // when user clicks button, open overlay   btn.onclick = function() { overlay.style.display = "block"; }  // when user clicks on <span> (x), close overlay  span.onclick = function() { overlay.style.display = "none"; }  // when user clicks anywhere outside of overlay, close  window.onclick = function(event) { if (event.target == overlay) {     overlay.style.display = "none"; } } </script>  </body> </html>

you looking getelementsbyclassname. getelementbyclassname not exist.





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