Placeholder Polyfill

placeholder_polyfill.js

/**
 * Placeholders for old browsers
 */
 function placeholderOldBrowsers() {
  if (!Modernizr.input.autofocus) {
    $('input').each(function(){
      if ($(this).attr('autofocus'))
        $(this).focus();
    });
  }
  if (!Modernizr.input.placeholder) {
    $('input').each(function(){
      if ($(this).attr('placeholder')) {
        var placeholder_text = $(this).attr('placeholder');
        $(this).attr('value', placeholder_text).addClass('nc');
      }
    });

    // for all fields with uncleared initial value, on focus
    $('.nc').focus(function() {
      // if it is uncleared
      if ($(this).hasClass('nc')) {
        // remeber the initial value
        var $textbox = $(this).val();

        // and remove it
        $(this).removeClass('nc').val('');
      }
    }).focusout(function() { // on focus out
      // if there is no new value posted by user
      if ($(this).val() == '')

          // mark as uncleared and show initial value
        $(this).addClass('nc').val($textbox);
      });
  }
}