WordPress/wp-includes/js/wp-auth-check.js

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JavaScript
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// Interim login dialog
(function($){
var wrap;
function show() {
var parent = $('#wp-auth-check'), form = $('#wp-auth-check-form'), noframe = wrap.find('.wp-auth-fallback-expired'), frame, loaded = false;
if ( form.length ) {
// Add unload confirmation to counter (frame-busting) JS redirects
$(window).on( 'beforeunload.wp-auth-check', function(e) {
e.originalEvent.returnValue = window.authcheckL10n.beforeunload;
});
frame = $('<iframe id="wp-auth-check-frame" frameborder="0">').attr( 'title', noframe.text() );
frame.load( function(e) {
var height, body;
loaded = true;
try {
body = $(this).contents().find('body');
height = body.height();
} catch(e) {
wrap.addClass('fallback');
form.remove();
noframe.focus();
return;
}
if ( height ) {
if ( body && body.hasClass('interim-login-success') ) {
height += 35;
parent.find('.wp-auth-check-close').show();
wrap.data('logged-in', 1);
setTimeout( function() { hide(); }, 3000 );
}
parent.css( 'max-height', height + 60 + 'px' );
}
}).attr( 'src', form.data('src') );
$('#wp-auth-check-form').append( frame );
}
wrap.removeClass('hidden');
if ( frame ) {
frame.focus();
// WebKit doesn't throw an error if the iframe fails to load because of "X-Frame-Options: DENY" header.
// Wait for 5 sec. and switch to the fallback text.
setTimeout( function() {
if ( ! loaded ) {
wrap.addClass('fallback');
form.remove();
noframe.focus();
}
}, 5000 );
} else {
noframe.focus();
}
}
function hide() {
$(window).off( 'beforeunload.wp-auth-check' );
wrap.fadeOut( 200, function() {
wrap.addClass('hidden').css('display', '').find('.wp-auth-check-close').css('display', '');
$('#wp-auth-check-frame').remove();
});
}
$( document ).on( 'heartbeat-tick.wp-auth-check', function( e, data ) {
if ( data['wp-auth-check'] && wrap.hasClass('hidden') ) {
show();
} else if ( ! data['wp-auth-check'] && ! wrap.hasClass('hidden') && ! wrap.data('logged-in') ) {
hide();
}
}).on( 'heartbeat-send.wp-auth-check', function( e, data ) {
data['wp-auth-check'] = 1;
}).ready( function() {
wrap = $('#wp-auth-check-wrap').data('logged-in', 0);
wrap.find('.wp-auth-check-close').on( 'click', function(e) {
hide();
});
});
}(jQuery));