ajax-ujs.js

    /**
     * Inserts the response content into a target element.
     *
     * data-once    Load ajax only once
     * data-target  #id of the target div
     * data-remote  true (Rais UJS properties)
     */
    $(document).on('ajax:success', '[data-target]', function(e, data, status, xhr) {
        if (this !== e.target) {
            return; // prevent propagation to parent nodes
        }

    	var target = $(this).data('target');

    	if (!$(target).length && target[0] == '#') {
    		// Create target if it doesn't exist
    		$('body').append('<div id="' + target.substring(1) + '"></div>');
    	}

        // Avoid losing called element, otherwise ajax:complete won't be called
        if ($(this).parents(target).length) {
            $(this).appendTo('body')
                .addClass('pending-ajax-complete')
                .hide();
        }

    	// Persist the target to new ajax links
    	$(target).html(data)
    		.find('[data-remote]:not([data-target])')
    		.attr('data-target', target);

        if ($(this).data('once')) {
            $(this).data('disabled', true);
        }
    });
    $(document).on('ajax:before', '[data-target]', function(e) {
        if ($(this).data('disabled')) {
            e.stopImmediatePropagation();
            return false;
        }
    });

    // Generic decoration
    $(document).on('ajax:before', '[data-remote]', function() {
        $('body').addClass('ajax-loading');
    });

    $(document).on('ajax:complete', '[data-remote]', function() {
        $('body').removeClass('ajax-loading');

        if ($(this).is('.pending-ajax-complete')) {
            $(this).remove();
        }
    });

    // Fancybox trigger
    /*
    $(document).on('ajax:success', '[data-toggle=fancybox]', function(xhr, data, status) {
    	var target = $(this).data('target');

        require(['fancybox'], function() {
        	$.fancybox(target, {
        		wrapCSS: target.substring(1) + '-modal' // allows custom style
        	});
        });
    });
    */
    // Append content from ajax
    /*
    $(document).on('ajax:success', '[data-append-to]', function(xhr, data, status) {
    	var appendTo = $(this).data('append-to');

    	$(appendTo).append(data);

    	// Handle data-params
    	if ($(this).data('params')) {
    		var paramsObj = deparam($(this).data('params'));

    		if (paramsObj.page) {
    			paramsObj.page++; // Paginate
    		}

    		$(this).data('params', $.param(paramsObj));
    	}
    });
    */