Wordpress/wp-admin/js/gallery.js

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JavaScript
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jQuery(function($) {
var gallerySortable;
var gallerySortableInit = function() {
gallerySortable = $('#media-items').sortable( {
items: '.media-item',
placeholder: 'sorthelper',
axis: 'y',
distance: 2,
update: galleryReorder
} );
}
// When an update has occurred, adjust the order for each item
var galleryReorder = function(e, sort) {
jQuery.each(sort['element'].sortable('toArray'), function(i, id) {
jQuery('#' + id + ' .menu_order input')[0].value = (1+i);
});
}
// initialize sortable
gallerySortableInit();
});
jQuery(document).ready(function($){
$('.menu_order_input').each(function(){
if ( this.value == '0' ) this.value = '';
});
});