How do you automatically set text box to Uppercase?

Question

I am using the following style attribute to set the user input to uppercase so that when the user starts typing in the text box for example railway, then it should

Answer 1

Try below solution, This will also take care when a user enters only blank space in the input field at the first index.

document.getElementById('capitalizeInput').addEventListener("keyup",   () => {
  var inputValue = document.getElementById('capitalizeInput')['value']; 
  if (inputValue[0] === ' ') {
      inputValue = '';
    } else if (inputValue) {
      inputValue = inputValue[0].toUpperCase() + inputValue.slice(1);
    }
document.getElementById('capitalizeInput')['value'] = inputValue;
});