var textBoxs = $('.input-text-js');
textBoxs.each(function() {
  var theValue = $(this).attr('value');
  $(this).focus(function (){
    if($(this).attr('value') == theValue){
      $(this).attr('value','').addClass('writingIt');
    }
  }).blur(function () {
    if($(this).attr('value') == ''){
      $(this).attr('value',theValue).removeClass('writingIt');
    }
  });
});

var textBoxs = $('.input-text-js');
textBoxs.each(function() {
var theValue = $(this).attr('value');
  $(this).focus(function (){
    if($(this).attr('value') == theValue){
      $(this).attr('value','').addClass('writingIt');
    }
  }).blur(function () {
    if($(this).attr('value') == ''){
      $(this).attr('value',theValue).removeClass('writingIt');
    }
  });
});

retto.com

<p>This snippet could be used when a text input has a default value. Thus, when user clicks on the input to write, the default value disappears and allows the user to write, but if the user does not type anything, the default value will appears again. It also adds a class to the input when the user is typing on it and is removed when the input loses focus.</p><p>This snippet must be inside the ready event.</p><p>For the HTML markup, the only thing to take care is that you must use the same class in all the inputs that you want to give this functionality. In the example I use \"input-text-js\",  but you can use whatever you want.</p><p>You can see this snippet working on www.retto.com</p>

Text input default value recover

javascript

jQuery