apply css class when an input is on focus code example

Example 1: input outline focus

input:focus, textarea:focus {
    background-color: #FFFF66;
    border: 1px solid #F47E58;
}

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
}