javaScript/calculator.html at master · Tajtaj/javaScript · GitHub

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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Simple Calculator implemented in javaScript</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.0/jquery.js"></script>
<script>


$(function () {

  // Add containers to the DOM
  var $calculator = $('<div/>', {id: 'calculator'}).appendTo('body');
  var $input = $('<input/>', {id: 'input'}).appendTo($calculator);
  var $buttons = $('<div/>', {id: 'buttons'}).appendTo($calculator);

  // Add buttons to the DOM
  $.each('1234567890.=+-*/←C'.split(''), function () {
    var $button = $('<button/>', {text: this.toString(), click: function () {
      // Handle button clicks
      switch ($(this).text()) {
        // '=' will fetch the current expression string, evaluate it,
        // and write the result back into the input/output field.
        // That's where the actual calculation happens.
		// eval($input.val()) will calculate the value and after that,
		// it will pass as an argument to $input.val means pringting it in input field.
        case '=': try {$input.val(eval($input.val()));}
					catch (e) {$input.val('ERROR');}
					break;
         //'C' will clear the input/output field
        case 'C': return $input.val('');
					break;
        // 'CE' will delete the last character from the input/output field
        case '←': return $input.val($input.val().replace(/.$/, ''));
				    break;
        // All other buttons will add a character to the input/output field
       default: $input.val($input.val() + $(this).text());
      }
    }}).appendTo($buttons);
  });
});

</script>
<script>
var loc = window.location.href;
//alert(loc);
</script>
<style type="text/css">
  #calculator {border: 1px solid; width: 130px;}
  #input {border: 1px solid; height: 20px; width: 114px; margin: 5px; padding: 2px; text-align: right;}
  #buttons {margin: 5px;}
  button {width: 30px; height: 30px;}
</style>

</head>
<body class="calculator calc"></body>
</html>