// Autosize iframe var funcSizeResponse = function( e ) { var origin = document.createElement( 'a' ); origin.href = e.origin;

// Verify message origin if ( 'wpcomwidgets.com' !== origin.host ) return;

// Verify message is in a format we expect if ( 'object' !== typeof e.data || undefined === e.data.msg_type ) return;

switch ( e.data.msg_type ) { case 'poll_size:response': var iframe = document.getElementById( e.data._request.frame_id );

if ( iframe && '' === iframe.width ) iframe.width = '100%'; if ( iframe && '' === iframe.height ) iframe.height = parseInt( e.data.height );

return; default: return; } }

if ( 'function' === typeof window.addEventListener ) { window.addEventListener( 'message', funcSizeResponse, false ); } else if ( 'function' === typeof window.attachEvent ) { window.attachEvent( 'onmessage', funcSizeResponse ); } } if (document.readyState === 'complete') { func.apply(); /* compat for infinite scroll */ } else if ( document.addEventListener ) { document.addEventListener( 'readystatechange', function(){ if (document.readyState === 'complete') { func.apply(); } }, false ); } else if ( document.attachEvent ) { document.attachEvent( 'onreadystatechange', func ); } } )();