Facebook Dom Placeholder on Password

Facebook has开发者_运维问答 a "Dom Placeholder" on their Password field when logging on. When I click on the input for the password, the placeholder disappears and allows me to type my password "masked".

Is this Javascript related and how would I go on replicating this script?

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Yes, it can be done via JavaScript, but some browsers also support it natively. The placeholder attribute is an HTML5 addition; certain browsers (such as WebKit-based browsers) support it already.

Example using jQuery 1.4

<!-- this will work automatically for some browsers -->
<input type="text" placeholder="enter some text">


<!-- script for browsers which don't support it natively -->
<script type="text/javascript">
$.fn.placeholder = function(){

  // quit if there's support for html5 placeholder
  if (this[0] && 'placeholder' in document.createElement('input')) return; 

  return this
    .live('focusin',function(){

      if ($(this).val() === $(this).attr('placeholder')) {
        $(this).val('');
      }

    }).live('focusout',function(){

      if ($(this).val() === ''){
        $(this).val( $(this).attr('placeholder') );
      }_  
    });
}

$('input[placeholder]').placeholder();
</script>

Note: code was copied from this Pastie linked from jQuery 1.4 hawtness. I haven't verified that it works across browsers. You can find other JavaScript solutions on Google if you don't use jQuery.

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There is a jQuery plugin that does this: http://plugins.jquery.com/node/14237