Clear Default Text Input Value on Focus

clear_input.js

// Clear Default Text Input Value on Focus

function hasPlaceholderSupport() {
  var input = document.createElement('input');
  return ('placeholder' in input);
}

if ( hasPlaceholderSupport() == false ) {
  $('input[type="text"]').each(function(){
    var def = $(this).attr('placeholder') != '' && $(this).attr('placeholder') != undefined ? $(this).attr('placeholder') : $(this).attr('value');
    $(this).val(def).attr('placeholder','');
    $(this).focus(function(){
      if($(this).val() == def){
        $(this).removeClass('placeholder').val('');
      }
    }).blur(function(){
      if($(this).val() == ''){
        $(this).addClass('placeholder').val(def);
      }
    });
  });
}