https://www.hotelstefanie.wien/system/modules/efg/assets/ncm_children_count.js

1// a simple jQuery plugin
2// @see: http://learn.jquery.com/plugins/basic-plugin-creation/
3//(function($) {
4    jQuery.fn.countChildren = function() {
5        return this.each(function() {
6            // check if we have the countChildren field
7            if (!jQuery(this).find("[name=countChildren]")
8                    .change(function() {
9                        jQuery(this).setChildNumDropdowns();
10                    })
11                    .size()) {
12                return;
13            }
14            // call it immediately
15            jQuery(this).setChildNumDropdowns();
16        });
17    };
18
19    // shows as many dropdowns as many children are set    
20    jQuery.fn.setChildNumDropdowns = function() {
21        // hide all sibling elements' containing divs
22        jQuery(this).closest("form").find(".ageChildren").closest(".form-group").hide();
23        // display as many as the value is
24        for (var index=1; index <= jQuery(this).val(); index++) {
25            jQuery(this).closest("form").find("[name=ageChild_"+ index +"]").closest(".form-group").show();
26        }
27    };
28//})(jQuery);
29
30// checks the form for "number of children" elements and age fields
31jQuery(function() {
32    jQuery("form").countChildren();    
33});
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