Dynamic bar chart

The JavaScript code

<jsxgraph width="700" height="600" box="box">
            board = JXG.JSXGraph.initBoard('box', {originX: 50, originY: 450, unitX: 50, unitY: 50, axis:false});
            board.suspendUpdate();
            board.createElement('axis', [[0,0], [1,0]], {strokeColor:'black'});
            board.createElement('axis', [[0,0], [0,1]], {strokeColor:'black'});            

            var s = board.createElement('slider', [[8,7],[11,7],[1,1,1.5]], {name:'S',strokeColor:'black',fillColor:'white'});
            var f = [function(){return this.board.round(s.Value()*4.5,2);},
                     function(){return this.board.round(s.Value()*(-1),2);},
                     function(){return this.board.round(s.Value()*3,2);},
                     function(){return this.board.round(s.Value()*2,2);},
                     function(){return this.board.round(s.Value()*(-0.5),2);},
                     function(){return this.board.round(s.Value()*5.5,2);},
                     function(){return this.board.round(s.Value()*2.5,2);},
                     function(){return this.board.round(s.Value()*(-0.75),2);},
                     function(){return this.board.round(s.Value()*(3.5),2);},
                     function(){return this.board.round(s.Value()*(2),2);},
                     function(){return this.board.round(s.Value()*(-1.25),2);}
                     ];
            var chart = board.createElement('chart', [f], {chartStyle:'bar',width:0.8,labels:f});
            chart[0][0].setProperty('fillColor:#8E1B77');
            chart[0][1].setProperty('fillColor:#BE1679');
            chart[0][2].setProperty('fillColor:#DC1765');
            chart[0][3].setProperty('fillColor:#DA2130');
            chart[0][4].setProperty('fillColor:#DB311B');
            chart[0][5].setProperty('fillColor:#DF4917');
            chart[0][6].setProperty('fillColor:#E36317');
            chart[0][7].setProperty('fillColor:#E87F1A');
            chart[0][8].setProperty('fillColor:#F1B112');
            chart[0][9].setProperty('fillColor:#FCF302');
            chart[0][10].setProperty('fillColor:#C1E212');
            
            var dataArr = [4,1,3,2,5,6.5,1.5,2,0.5,1.5,-1];            
            var chart2 = board.createElement('chart', dataArr, {chartStyle:'line,point'});
            chart2[0].setProperty('strokeColor:black','strokeWidth:2pt');
            for(var i=0; i<11;i++) {
                chart2[1][i].setProperty('strokeColor:black','fillColor:white','style:9','strokeWidth:2pt');
            }
            board.unsuspendUpdate();

</jsxgraph>