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HTML

              
                  <!-- 
   The following is a common layout you would see in an email client.

   When a user clicks a checkbox, holds Shift, and then clicks another checkbox a few rows down, all the checkboxes inbetween those two checkboxes should be checked.
  
  -->
  <div class="inbox">
    <div class="item">
      <input type="checkbox">
      <p>This is an inbox layout.</p>
    </div>
    <div class="item">
      <input type="checkbox">
      <p>Check one item</p>
    </div>
    <div class="item">
      <input type="checkbox">
      <p>Hold down your Shift key</p>
    </div>
    <div class="item">
      <input type="checkbox">
      <p>Check a lower item</p>
    </div>
    <div class="item">
      <input type="checkbox">
      <p>Everything inbetween should also be set to checked</p>
    </div>
    <div class="item">
      <input type="checkbox">
      <p>Try do it with out any libraries</p>
    </div>
    <div class="item">
      <input type="checkbox">
      <p>Just regular JavaScript</p>
    </div>
    <div class="item">
      <input type="checkbox">
      <p>Good Luck!</p>
    </div>
    <div class="item">
      <input type="checkbox">
      <p>Don't forget to tweet your result!</p>
    </div>
  </div>

  <p class="details">Here is a <a href="http://wes.io/f1oa" target="_blank">video</a> on how it should work. I'll post my answer after everyone has had a chance to do it.</p>

              
            
!

CSS

              
                    html {
      font-family: sans-serif;
      background:#ffc600;
    }

    .inbox {
      max-width:400px;
      margin:50px auto;
      background:white;
      border-radius:5px;
      box-shadow:10px 10px 0 rgba(0,0,0,0.1);
    }
    
    .item {
      display:flex;
      align-items:center;
      border-bottom: 1px solid #F1F1F1;
    }

    .item:last-child {
      border-bottom:0;
    }


    input:checked + p {
      background:#F9F9F9;
      text-decoration: line-through;
    }

    input[type="checkbox"] {
      margin:20px;
    }
    
    p {
      margin:0;
      padding:20px;
      transition:background 0.2s;
      flex:1;
      font-family:'helvetica neue';
      font-size: 20px;
      font-weight: 200;
      border-left: 1px solid #D1E2FF;
    }
  
    .details {
      text-align: center;
      font-size: 15px;
    }

              
            
!

JS

              
                    /*
        
        This is the answer. 

        If you haven't yet tried this challenge, delete everything here
        don't peek!
        Serious! 
        Give it a shot yourself first.
        Then come look.
        😘😘😘

    */
    
    // First we create an array of all the checkboxes - we will use this twice in our app
    // we use slice.call to convert the node list to a real array
    var checkboxes = [].slice.call(document.querySelectorAll('.inbox [type="checkbox"]'));
    
    // we create a variable called lastChecked that will hold a reference to the last checkbox we checked. This will let us figure out which way to go 
    var lastChecked;

    // create the handler that will run when someone "clicks" a box
    function handleCheck(e) {

      // check if 1) they are holding shift 2) we checked this box (it's not an un-check)
      if(e.shiftKey && this.checked) {
        // create a flag boolean - more on this in a sec
        var inBetween = false;

        // loop through each input
        checkboxes.forEach( input => {

          // Here is where we make our sausage.
          // We want to see if the current loop iteration is 
          // either input we checked, or the last one we checked
          // This will allow us to turn on the checking (inBetween) when we pass one of them, and turn it off when we pass the other. 
          // This might be a little confusing but it allows us to go both ways
          if(input === this || input === lastChecked) {
            inBetween = !inBetween;
          }
          
          // finally, if we are currently inBetween the lastChecked and the one that
          // was just checked. Go ahead and mark that one as checked
          if(inBetween) {
            input.checked = true;
          }
        });
      }
      // update last Checked regardless
      lastChecked = this;
    }

    // loop over each checkbox and attach the event listener to it
    checkboxes.forEach(checkbox => checkbox.addEventListener('click',handleCheck));

              
            
!
999px

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