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<!--
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>
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;
}
/*
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));
Also see: Tab Triggers