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Comments: after [35593], extend support to IE8 and improve checking for elements hidden with CSS

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Props afercia.
Fixes #29974.


git-svn-id: https://develop.svn.wordpress.org/trunk@35675 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Scott Taylor 2015-11-18 19:14:50 +00:00
parent 0e5625e4fa
commit 2499be55d6
1 changed files with 26 additions and 22 deletions
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48
src/wp-includes/js/comment-reply.js
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@ -1,6 +1,6 @@
var addComment = {
moveForm: function( commId, parentId, respondId, postId ) {
var div, element, node, style, cssHidden,
var div, element, style, cssHidden,
t = this,
comm = t.I( commId ),
respond = t.I( respondId ),
@ -47,40 +47,44 @@ var addComment = {
return false;
};
// Set initial focus to the first form focusable element.
/*
* Set initial focus to the first form focusable element.
* Try/catch used just to avoid errors in IE 7- which return visibility
* 'inherit' when the visibility value is inherited from an ancestor.
*/
try {
for ( var i = 0; i < commentForm.elements.length; i++ ) {
element = commentForm.elements[i];
cssHidden = false;
// Skip form elements that are hidden or disabled.
if ( 'hidden' === element.type || element.hasAttribute( 'disabled' ) ) {
continue;
// Modern browsers.
if ( 'getComputedStyle' in window ) {
style = window.getComputedStyle( element );
// IE 8.
} else if ( document.documentElement.currentStyle ) {
style = element.currentStyle;
}
if ( 'getComputedStyle' in window ) {
node = element;
cssHidden = false;
/*
* For display none, do the same thing jQuery does. For visibility,
* check the element computed style since browsers are already doing
* the job for us. In fact, the visibility computed style is the actual
* computed value and already takes into account the element ancestors.
*/
if ( ( element.offsetWidth <= 0 && element.offsetHeight <= 0 ) || style.visibility === 'hidden' ) {
cssHidden = true;
}
while( node.parentNode ) {
style = window.getComputedStyle( node );
if ( style.display === 'none' || style.visibility === 'hidden' ) {
cssHidden = true;
break;
}
node = node.parentNode;
}
if ( cssHidden ) {
continue;
}
// Skip form elements that are hidden or disabled.
if ( 'hidden' === element.type || element.disabled || cssHidden ) {
continue;
}
element.focus();
// Stop after the first focusable element.
break;
}
} catch( er ) {}
return false;