MediaWiki:Common.js

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$(function () {
            $('#btn-random').click(function() {
                $.ajax({
                    type: "GET",
                    url: 'lunchalgo.php',
                    dataType: 'json',
                    success: function(jsondata){
                        console.log(jsondata);
                        $('#lunch-random').html(jsondata.percentages + '<br/>' + jsondata.choice);
                    }
                });
            });
        }());