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$('body').on('click', '.ajax-modal', function() {
    $('.ui.modal')
        .modal({
            onShow: function(callback) {
              callback = $.isFunction(callback) ? callback : function(){};
              var $content = $(this).find('.content');
              $.get("contentData.php", function(data) {
                $content.html(data);
              });
            }
        }).modal('show')
});