How to Create a Calculator in Javascript With Code

Do you want to create the calculator in javascript? Don’t worry today we have a code for creating a calculator in javascript.

Create a Calculator in Javascript

To create a simple calculator in JavaScript, you will need to use the eval function to evaluate mathematical expressions entered by the user. Here is an example of how you might go about building a calculator:

1. Create an HTML file with a form element and input fields for the user to enter a mathematical expression. You might also want to include buttons for the various operations (e.g. addition, subtraction, multiplication, and division).
2. In the form element, add an onsubmit attribute that calls a JavaScript function when the form is submitted. This function will be responsible for evaluating the mathematical expression and displaying the result.
3. In the JavaScript function, use the eval function to evaluate the mathematical expression entered by the user. You can access the value of the input field using the value property of the input element (e.g. document.getElementById('input').value).
4. Use the innerHTML property to display the result of the calculation in an HTML element on the page (e.g. a div element).

Here is an example of a simple calculator that adds two numbers:

<form onsubmit="return calculate()">
  <input type="text" id="input1"> + 
  <input type="text" id="input2">
  <input type="submit" value="Calculate">
</form>

<div id="result"></div>

<script>
function calculate() {
  var input1 = document.getElementById('input1').value;
  var input2 = document.getElementById('input2').value;
  var result = eval(input1 + '+' + input2);
  document.getElementById('result').innerHTML = result;
  return false;
}
</script>

This calculator will display the result of adding the two numbers entered by the user when the form is submitted. You can extend this example to support other operations by modifying the JavaScript function to handle different cases.

Another Code for Creating a Calculator in Javascript

To create a calculator in JavaScript, you will need to use HTML to create the interface for the calculator and JavaScript to handle the logic for the calculator.

Here is an example of a simple calculator that adds two numbers:

<!-- This is the HTML for the calculator interface -->
<form>
  <label>First Number:</label>
  <input type="number" id="num1">
  <br>
  <label>Second Number:</label>
  <input type="number" id="num2">
  <br>
  <button type="button" onclick="calculate()">Calculate</button>
</form>

<!-- This is the JavaScript for the calculator logic -->
<script>
  function calculate() {
    // Get the values of the input fields
    var num1 = document.getElementById("num1").value;
    var num2 = document.getElementById("num2").value;

    // Convert the strings to numbers
    num1 = parseInt(num1);
    num2 = parseInt(num2);

    // Add the numbers
    var result = num1 + num2;

    // Display the result
    alert(result);
  }
</script>

This calculator has two input fields for the user to enter numbers, and a button that, when clicked, calls the calculate function. The calculate function gets the values of the input fields, converts them to numbers, adds them together, and displays the result using an alert.

You can extend this example to create a more feature-rich calculator by adding more operations (e.g. subtraction, multiplication, division), handling errors (e.g. if the user enters a non-numeric value), and displaying the result in a more user-friendly way (e.g. using a div element instead of an alert).

How to check if element / button is disabled or enabled