calc/calculator.html at master · sof123/calc · GitHub

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<!DOCTYPE HTML>

<html>

<textarea id = "input" readonly></textarea>

<table style="width:10%">

  <tr>

	<td></td>
	<td></td>
	<td></td>
	<td></td>
	<td></td>
  </tr>
  <tr>
    <td><button id="one" onclick = "updateScreen(1)" type="button">1</button></td>
    <td><button id = "two" onclick = "updateScreen(2)" type="button">2</button></td>
    <td><button id = "three" onclick = "updateScreen(3)" type="button">3</button></td>
	<td><button id = "plus" onclick = "updateScreen('+')" type="button">+</button></td>
	<td><button id = "times" onclick = "updateScreen('*')" type="button">*</button></td>
	<td><button id="c" onclick = "updateScreen('c')" type="button">c</button></td>
  </tr>
  <tr>
    <td style="width:25%"><button id = "four" onclick = "updateScreen(4)" type="button">4</button></td>
    <td><button id = "five" onclick = "updateScreen(5)" type="button">5</button></td>
    <td><button id = "six" onclick = "updateScreen(6)" type="button">6</button></td>
	<td><button id = "minus" onclick = "updateScreen('-')" type="button">-</button></td>
	<td><button id = "by" onclick = "updateScreen('/')" type="button">/</button></td>
  </tr>
  <tr>
    <td><button id = "seven" onclick = "updateScreen(7)" type="button">7</button></td>
    <td><button id = "eight" onclick = "updateScreen(8)" type="button">8</button></td>
    <td><button id = "nine" onclick = "updateScreen(9)" type="button">9</button></td>
	<td><button id = "period" onclick = "updateScreen('.')" type="button">.</button></td>
	<td><button id = "equals" onclick = "updateScreen('=')" type="button">=</button></td>
  </tr>
</table>


<script>
var currentText = "";
var afterEqual = 0;
function updateScreen(number)
{
	if (number !== "=" && number != 'c')
	{
		if (afterEqual === 1)
		{
			currentText = "";
			document.getElementById("input").innerHTML = "";
		}
		currentText+=number;
		document.getElementById("input").innerHTML+= number;
		afterEqual = 0;
	}
	//on equals sign
	else if (number === "=" )
	{
		document.getElementById("input").innerHTML = (Function('return ' + currentText + ';'))();
		afterEqual = 1;
	}
	else if (number === "c")
	{
		currentText = "";
		document.getElementById("input").innerHTML = "";
		afterEqual = 0;

	}
}
</script>

</html>