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- Receive input from a HTML text box.
- When user click the button to convert Celsius to Fahrenheit, execute JavaScript function –
convertToFahrenheit(). - The function uses the formula:
F = (Celsius * 9/5) + 32to convert Celsius to Fahrenheit. - The function then output the result to an H1 tag for display.
In this example , we will test a simple algorithms to convert temperature in Celsius to Fahrenheit and display on a HTML page.
The step to convert from Celsius to Fahrenheit is given below.
JavaScript Code: Celsius To Fahrenheit
function convertToF() {
let celsius = document.getElementById("inp").value;
let fahrenheit = (celsius * 9/5) + 32;
document.getElementById("demo").innerHTML = fahrenheit + "°F";
}The function uses the id attribute of HTML element to access the input and print the output in the above program. The rest of the code is to compute the Fahrenheit value.
The entire HTML code and JavaScript code for the program is given below. We also put some CSS code so that the input elements appear nice. You can learn more about the HTML form elements from our HTML tutorial.
HTML and JavaScript Code: Celsius to Fahrenheit
<!DOCTYPE html>
<html>
<head>
<title>Celcius To Fahrenheit</title>
<meta charset="utf-8">
</head>
<body>
<h1 id="demo">Output here</h1>
<input type="text" id="inp" value="enter celsius"/>
<button onclick="convertToFahrenheit()">Convert</button>
<script>
function convertToFahrenheit() {
let celsius = document.getElementById("inp").value;
let fahrenheit = (celsius * 9/5) + 32;
document.getElementById("demo").innerHTML = fahrenheit + "°F";
}
</script>
</body>
</html>Output To Browser: Celsius to Fahrenheit
