Detect user events on obscured elements.
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August 29, 2015 14:14
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Layered Event Listeners
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<fieldset> | |
<legend>Layered Event Listeners</legend> | |
<div class="box under" id="under"></div> | |
<div class="box over" id="over"></div> | |
</fieldset> |
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var | |
under = document.getElementById("under"), | |
over = document.getElementById("over") | |
; | |
under.addEventListener('mouseenter', function (e){ | |
$(this).addClass('circle'); | |
}); | |
under.addEventListener('mouseleave', function (e) { | |
$(this).removeClass('circle'); | |
}); | |
over.addEventListener('mousemove', function (e) { | |
this.style.visibility = "hidden"; | |
var elem = document.elementFromPoint(e.clientX, e.clientY); | |
this.style.visibility = "visible"; | |
$(this).addClass('circle'); | |
if(elem.id === under.id) { | |
under.dispatchEvent(new Event('mouseenter')); | |
} else { | |
under.dispatchEvent(new Event('mouseleave')); | |
}; | |
}); | |
over.addEventListener('mouseleave', function (e) { | |
$(this).removeClass('circle'); | |
}); |
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html { | |
font-size: 62.5%; | |
} | |
body { | |
font-size: 1.6rem; | |
font-family: Helvetica, sans-serif; | |
} | |
legend { | |
text-align: center; | |
font-weight: bold; | |
font-size: 3.5rem; | |
} | |
fieldset { | |
position: relative; | |
border: 1px solid #ccc; | |
border-radius: 1rem; | |
padding: 2rem; | |
} | |
.box { | |
position: relative; | |
margin: 0 auto; | |
width: 100px; | |
height: 100px; | |
transition: border-radius .3s ease; | |
} | |
.circle { | |
border-radius: 50px; | |
} | |
.under { | |
top: 25px; | |
left: -25px; | |
background-color: rgba(255, 0, 0, 0.75); | |
box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.75); | |
} | |
.over { | |
top: -25px; | |
left: 25px; | |
background-color: rgba(0, 0, 255, 0.75); | |
box-shadow: 0 1px 8px 1px rgba(0, 0, 0, 0.75); | |
} |
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