Wordpress/wp-admin/js/accordion.js

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JavaScript
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( function( $ ){
$( document ).ready( function () {
// Expand/Collapse on click
$( '.accordion-container' ).on( 'click keydown', '.accordion-section-title', function( e ) {
if ( e.type === 'keydown' && 13 !== e.which ) // "return" key
return;
e.preventDefault(); // Keep this AFTER the key filter above
accordionSwitch( $( this ) );
accordionCorners();
});
// Refresh selected accordion option when screen options are toggled
$( '.hide-postbox-tog' ).click( function () {
accordionInit();
});
});
var accordionOptions = $( '.accordion-container li.accordion-section' ),
sectionContent = $( '.accordion-section-content' );
// Rounded corners
function accordionCorners () {
accordionOptions.removeClass( 'top bottom' );
accordionOptions.filter( ':visible' ).first().addClass( 'top' );
accordionOptions.filter( ':visible' ).last().addClass( 'bottom' ).find( sectionContent ).addClass('bottom');
};
function accordionInit () {
accordionSwitch( accordionOptions.filter( ':visible' ).first() );
accordionCorners();
}
function accordionSwitch ( el ) {
var section = el.closest( '.accordion-section' ),
siblings = section.parent().find( '.open' ),
content = section.find( sectionContent );
if ( section.hasClass( 'cannot-expand' ) )
return;
siblings.removeClass( 'open' );
siblings.find( sectionContent ).show().slideUp( 150 );
content.toggle( section.hasClass( 'open' ) ).slideToggle( 150 );
section.toggleClass( 'open' );
}
// Show the first accordion option by default
accordionInit();
})(jQuery);