how to select input field in javascript code example

Example 1: how to select input element javascript

<input type="text" id="text-box" size="20" value="Hello world!">
<button onclick="selectText()">Select text</button>

<script>
  /* Use The
  .focus();
  .select(); 
  Methods */
function selectText() {
  const input = document.getElementById('text-box');
  input.focus();
  input.select();
}
</script>

Example 2: javascript select input text on focus

focusMethod = function getFocus() {           
  document.getElementById("myTextField").focus(); //select the input textfield and set the focus on it
}