AccessU-JavaScript/modal-dialog-complete.html at main · offsetChris/AccessU-JavaScript · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>AccessU Accessible JavaScript</title>
  <style>
     body { font-family: Arial, sans-serif; margin: 0; padding: 20px; font-size:1.2em;}

     #legacyDialog{
      height:300px;
      width:300px;
      position:absolute;
      top:200px;
      left:40%;
      background:lightgrey;
      display:none;
     }

  </style>
</head>

<body>
  <h1>Modal Dialog test</h1>

  <!-- Non-HTML dialog (legacy) -->
  <button id="legacyOpen">Open the legacy dialog</button>
  <div id="legacyDialog">
    <p>This is a legacy modal Dialog</p>
      <form>
        <label>Input 1
          <input type="text">
        </label>
        <fieldset>
          <label>
            <input type="checkbox">
            Check 1
          </label>
          <label>
            <input type="checkbox">
            Check 2
          </label>
          <label>
            <input type="checkbox">
            Check 3
          </label>
        </fieldset>
        <button type="submit">Submit</button>
      </form>
      <button id="legacyClose">Close</button>
  </div>

  <!-- HTML Dialog open button -->
   <button id="htmlOpen">Open the HTML dialog</button>
  <!-- HTML Dialog element -->
  <dialog id="htmlDialog">
    <p>This is an HTML modal Dialog</p>
    <form>
      <label>Input 1
        <input type="text">
      </label>
      <fieldset>
        <label>
          <input type="checkbox">
          Check 1
        </label>
        <label>
          <input type="checkbox">
          Check 2
        </label>
        <label>
          <input type="checkbox">
          Check 3
        </label>
      </fieldset>
      <button type="submit">Submit</button>
    </form>
    <button id="htmlClose">Close</button>
  </dialog>

  <script>


// Legacy dialog implementation
    const legacyOpen = document.getElementById("legacyOpen");
    const legacyDialog = document.getElementById("legacyDialog");
    let returnEl;
    // Write a function that opens the modal window
    legacyOpen.addEventListener("click", function(){
      legacyDialog.style.display = "block";
      returnEl = event.target;
      keyboardTrap(legacyDialog);
    });

    legacyClose.addEventListener("click", function(){
      legacyDialog.style.display = "none";
      returnEl.focus();
    });
    // Write a function to trap keyboard focus inside the modal
    function keyboardTrap(activeEl){
      // spacing in attribute selector needs to match HTML exactly.
      const allElements = "button:not([style='display:none;']), [href], input, select, textarea, [tabindex]:not([tabindex='1'])";
      const modalElements = activeEl.querySelectorAll(allElements);
      // console.log(modalElements, typeof modalElements)
      const firstModalEl = modalElements[0];
      const lastModalEl = modalElements[modalElements.length - 1];
      firstModalEl.focus();
      document.addEventListener("keydown", function(){
        if(event.keyCode == 9){
          if(document.activeElement === firstModalEl && event.shiftKey){
            lastModalEl.focus();
            event.preventDefault();
            return false;

          }
          if(document.activeElement === lastModalEl && !event.shiftKey) {
            firstModalEl.focus();
            event.preventDefault();
            return false;
          }
        }
      })
    }


    // Add an event listener for escape key and close modal, return focus to launch button


// HTML dialog!
// built in keyboard trap and escape key
    const htmlDialog = document.getElementById("htmlDialog");
    const htmlOpen = document.getElementById("htmlOpen");
    const htmlClose = document.getElementById("htmlClose");

  // Add click event to the modal open button
    htmlOpen.addEventListener("click", () =>{
      htmlDialog.showModal();
    });

    htmlClose.addEventListener("click", () =>{
      htmlDialog.close();
    });


  </script>
</body>
</html>