defaultDisplay.js
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define([
"../core",
"../manipulation" // appendTo
], function( jQuery ) {
var iframe,
elemdisplay = {};
/**
* Retrieve the actual display of a element
* @param {String} name nodeName of the element
* @param {Object} doc Document object
*/
// Called only from within defaultDisplay
function actualDisplay( name, doc ) {
var style,
elem = jQuery( doc.createElement( name ) ).appendTo( doc.body ),
// getDefaultComputedStyle might be reliably used only on attached element
display = window.getDefaultComputedStyle && ( style = window.getDefaultComputedStyle( elem[ 0 ] ) ) ?
// Use of this method is a temporary fix (more like optimization) until something better comes along,
// since it was removed from specification and supported only in FF
style.display : jQuery.css( elem[ 0 ], "display" );
// We don't have any data stored on the element,
// so use "detach" method as fast way to get rid of the element
elem.detach();
return display;
}
/**
* Try to determine the default display value of an element
* @param {String} nodeName
*/
function defaultDisplay( nodeName ) {
var doc = document,
display = elemdisplay[ nodeName ];
if ( !display ) {
display = actualDisplay( nodeName, doc );
// If the simple way fails, read from inside an iframe
if ( display === "none" || !display ) {
// Use the already-created iframe if possible
iframe = (iframe || jQuery( "<iframe frameborder='0' width='0' height='0'/>" )).appendTo( doc.documentElement );
// Always write a new HTML skeleton so Webkit and Firefox don't choke on reuse
doc = iframe[ 0 ].contentDocument;
// Support: IE
doc.write();
doc.close();
display = actualDisplay( nodeName, doc );
iframe.detach();
}
// Store the correct default display
elemdisplay[ nodeName ] = display;
}
return display;
}
return defaultDisplay;
});