A Pen by Jesse Hattabaugh on CodePen.
Created
April 4, 2016 22:50
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calculator
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<output></output> | |
<div> | |
<input type="button" value="7" /> | |
<input type="button" value="8" /> | |
<input type="button" value="9" /> | |
<button value="/">÷</button> | |
</div> | |
<div> | |
<input type="button" value="4" /> | |
<input type="button" value="5" /> | |
<input type="button" value="6" /> | |
<button value="*">x</button> | |
</div> | |
<div> | |
<input type="button" value="1" /> | |
<input type="button" value="2" /> | |
<input type="button" value="3" /> | |
<button value="-">-</button> | |
</div> | |
<div> | |
<input type="button" value="0" /> | |
<input type="button" value="." /> | |
<button value="+">+</button> | |
<button value="=">=</button> | |
</div> |
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var output = document.querySelector('output'); | |
var inputs = document.querySelectorAll('[type=button]'); | |
var operators = document.querySelectorAll('button'); | |
var left; | |
var op; | |
[].forEach.call(inputs, function (el) { | |
el.addEventListener('click', function (ev) { | |
if (op == '=') { | |
output.value = ''; | |
} | |
output.value += parseInt(ev.target.value); | |
}); | |
}); | |
[].forEach.call(operators, function (el) { | |
el.addEventListener('click', function (ev) { | |
var right = parseFloat(output.value); | |
if (left) { | |
if (op == '/') { | |
left = left / right; | |
} else if (op == '*') { | |
left = left * right; | |
} else if (op == '-') { | |
left = left - right; | |
} else if (op == '+') { | |
left = left + right; | |
} | |
} else { | |
left = right; | |
} | |
op = ev.target.value; | |
if (op == '=') { | |
output.value = left; | |
left = null; | |
} else { | |
output.value = ''; | |
} | |
}); | |
}); |
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output { | |
display: block; | |
border: 1px inset silver; | |
width: 5em; | |
height: 1em; | |
padding: .5em; | |
text-align: right; | |
} |
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