Html Put a fixed text on an input text

Question

How can i put a default text in an input html element which user can\'t delete (fixed text on start of the input).

The second thing what i want that the cursor will b

Answer 1

var requiredText = 'https://';
$('#site').on('input', function() {
  if (String($(this).val()).indexOf(requiredText) == -1) {
    $(this).val(requiredText);
  }
});