Javascript DOM HTML Input Checkbox convert text in an input field to uppercase

Introduction

Use a checkbox to convert text in an input field to uppercase:

View in separate window

<!DOCTYPE html>
<html>
<body>
<form>
First Name: <input type="text" id="fname" value="Donald">
<br><br>
Convert to upper case/* www. j ava  2 s  .  co  m*/
<input type="checkbox" onclick="if(this.checked){myFunction()}">
</form>

<script>
function myFunction() {
  document.getElementById("fname").value = 
          document.getElementById("fname").value.toUpperCase();
}
</script>

</body>
</html>

Related