This is a d3.js code which calls volcano.json to generate a simple heat map, however it seems not working and i cannot see any alerts in chrome. I know the problem is in graph.js, can any one tell me what's the problem in here and the solution for that? The graph should generate like this: 

Title

index.html	graph.js	volcano.json
	var width = 200; var height = 100; var margin = {top: 20, right: 20, bottom: 30, left: 40}; var dataset = d3.json("volcano.json", function(error, data) { console.log([data]); }) var y_scale = d3.scale.linear() .domain([0,101]) .range([0, 101 * 4]); var x_scale = d3.scale.linear() .domain([2010,2057]) .range([0, 47 * 4]); var c_scale = d3.scale.linear() .domain([0, 50000, 130000]) .range(['red','green', 'blue']) .interpolate(d3.interpolateRgb) var svg = d3.select("svg"); var g = svg.append("g") .attr("transform", "translate(" + margin.left + "," + margin.top + ")"); rects = g.append('g') .selectAll('rect') .data(dataset) .enter() .append('rect') .attr('x', function(d) {return x_scale(d.year)}) .attr('y', function(d) {return y_scale(d.age)}) .attr('width',4) .attr('height', 4) .attr('fill', function(d) { return c_scale(d.low); }); var y_axis = d3.svg.axis() .scale(y_scale) .orient("left"); g.append("g") .attr("class", "y axis") .call(y_axis); var x_axis = d3.svg.axis() .scale(x_scale) .orient("bottom") .ticks(3); g.append('g') .attr('class', 'x axis') .attr("transform", "translate(0," + 404 + ")") .call(x_axis); var counter = 0; function transition() { counter++; var transition_steps = ['low', 'medium','high']; var s = counter % 3; var field = transition_steps[s]; rects .transition() .attr('fill', function(d) { return c_scale(d[field]); }) .duration(2000) } $('svg g').first().on('click', function() { transition(); }); console.log('end ' + new Date);	[ {"year": 2010, "age": 0, "low": 62254, "medium": 63707, "high": 65355}, {"year": 2010, "age": 1, "low": 63989, "medium": 64116, "high": 64400}, {"year": 2010, "age": 2, "low": 63303, "medium": 63426, "high": 63693}, {"year": 2010, "age": 3, "low": 59880, "medium": 59998, "high": 60246}, {"year": 2010, "age": 4, "low": 59373, "medium": 59486, "high": 59721}, {"year": 2010, "age": 5, "low": 58308, "medium": 58416, "high": 58637}, {"year": 2010, "age": 6, "low": 57046, "medium": 57149, "high": 57360}, {"year": 2010, "age": 7, "low": 56592, "medium": 56691, "high": 56892}, {"year": 2010, "age": 8, "low": 57836, "medium": 57932, "high": 58126}, {"year": 2010, "age": 9, "low": 59056, "medium": 59149, "high": 59337}, {"year": 2010, "age": 10, "low": 58642, "medium": 58733, "high": 58914}, {"year": 2010, "age": 11, "low": 58600, "medium": 58688, "high": 58861}, {"year": 2010, "age": 12, "low": 59265, "medium": 59350, "high": 59517}, {"year": 2010, "age": 13, "low": 59571, "medium": 59653, "high": 59816}, {"year": 2010, "age": 14, "low": 60174, "medium": 60257, "high": 60418}, {"year": 2010, "age": 15, "low": 61578, "medium": 61666, "high": 61837}, {"year": 2010, "age": 16, "low": 61717, "medium": 61822, "high": 62021}, {"year": 2010, "age": 17, "low": 62304, "medium": 62448, "high": 62745}, {"year": 2010, "age": 18, "low": 63469, "medium": 63650, "high": 64004}, {"year": 2010, "age": 19, "low": 63761, "medium": 63970, "high": 64371}, {"year": 2010, "age": 20, "low": 63943, "medium": 64181, "high": 64640}, {"year": 2010, "age": 21, "low": 63083, "medium": 63341, "high": 63838}, {"year": 2010, "age": 22, "low": 63281, "medium": 63549, "high": 64069}, {"year": 2010, "age": 23, "low": 64069, "medium": 64341, "high": 64870}, {"year": 2010, "age": 24, "low": 65942, "medium": 66213, "high": 66743}, {"year": 2010, "age": 25, "low": 66975, "medium": 67240, "high": 67761}, {"year": 2010, "age": 26, "low": 66604, "medium": 66859, "high": 67359}, {"year": 2010, "age": 27, "low": 67042, "medium": 67286, "high": 67766}, {"year": 2010, "age": 28, "low": 64770, "medium": 65001, "high": 65451}, {"year": 2010, "age": 29, "low": 63731, "medium": 63947, "high": 64369}, {"year": 2010, "age": 30, "low": 61893, "medium": 62096, "high": 62489}, {"year": 2010, "age": 31, "low": 60219, "medium": 60409, "high": 60776}, {"year": 2010, "age": 32, "low": 59966, "medium": 60145, "high": 60488}, {"year": 2010, "age": 33, "low": 60191, "medium": 60358, "high": 60683}, {"year": 2010, "age": 34, "low": 60723, "medium": 60881, "high": 61188}, {"year": 2010, "age": 35, "low": 61844, "medium": 61993, "high": 62283}, {"year": 2010, "age": 36, "low": 63712, "medium": 63852, "high": 64131}, {"year": 2010, "age": 37, "low": 65821, "medium": 65953, "high": 66220}, {"year": 2010, "age": 38, "low": 67945, "medium": 68072, "high": 68330}, {"year": 2010, "age": 39, "low": 68911, "medium": 69032, "high": 69277}, {"year": 2010, "age": 40, "low": 65494, "medium": 65605, "high": 65831}, {"year": 2010, "age": 41, "low": 64114, "medium": 64220, "high": 64432}, {"year": 2010, "age": 42, "low": 61933, "medium": 62030, "high": 62229}, {"year": 2010, "age": 43, "low": 61663, "medium": 61755, "high": 61942}, {"year": 2010, "age": 44, "low": 61425, "medium": 61513, "high": 61692}, {"year": 2010, "age": 45, "low": 62359, "medium": 62442, "high": 62615}, {"year": 2010, "age": 46, "low": 64277, "medium": 64357, "high": 64527}, {"year": 2010, "age": 47, "low": 64772, "medium": 64847, "high": 65012}, {"year": 2010, 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50071}, {"year": 2010, "age": 62, "low": 49787, "medium": 49823, "high": 49915}, {"year": 2010, "age": 63, "low": 51587, "medium": 51622, "high": 51713}, {"year": 2010, "age": 64, "low": 43432, "medium": 43464, "high": 43541}, {"year": 2010, "age": 65, "low": 42362, "medium": 42391, "high": 42463}, {"year": 2010, "age": 66, "low": 39466, "medium": 39493, "high": 39560}, {"year": 2010, "age": 67, "low": 35465, "medium": 35490, "high": 35551}, {"year": 2010, "age": 68, "low": 34876, "medium": 34900, "high": 34958}, {"year": 2010, "age": 69, "low": 32189, "medium": 32211, "high": 32265}, {"year": 2010, "age": 70, "low": 30929, "medium": 30951, "high": 31002}, {"year": 2010, "age": 71, "low": 29169, "medium": 29190, "high": 29237}, {"year": 2010, "age": 72, "low": 27038, "medium": 27058, "high": 27101}, {"year": 2010, "age": 73, "low": 25997, "medium": 26015, "high": 26057}, {"year": 2010, "age": 74, "low": 24308, "medium": 24326, "high": 24364}, {"year": 2010, "age": 75, "low": 22376, 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89, "low": 7313, "medium": 7321, "high": 7334}, {"year": 2010, "age": 90, "low": 6149, "medium": 6155, "high": 6168}, {"year": 2010, "age": 91, "low": 4553, "medium": 4559, "high": 4570}, {"year": 2010, "age": 92, "low": 3630, "medium": 3636, "high": 3646}, {"year": 2010, "age": 93, "low": 3008, "medium": 3013, "high": 3022}, {"year": 2010, "age": 94, "low": 2346, "medium": 2351, "high": 2359}, {"year": 2010, "age": 95, "low": 1858, "medium": 1864, "high": 1871}, {"year": 2010, "age": 96, "low": 1392, "medium": 1397, "high": 1404}, {"year": 2010, "age": 97, "low": 1021, "medium": 1026, "high": 1032}, {"year": 2010, "age": 98, "low": 740, "medium": 744, "high": 750}, {"year": 2010, "age": 99, "low": 510, "medium": 514, "high": 520}, {"year": 2010, "age": 100, "low": 854, "medium": 857, "high": 862}, {"year": 2011, "age": 0, "low": 60970, "medium": 64009, "high": 67371}, {"year": 2011, "age": 1, "low": 62833, "medium": 64476, "high": 66389}, {"year": 2011, "age": 2, "low": 64574, "medium": 64897, "high": 65439}, {"year": 2011, "age": 3, "low": 63896, "medium": 64204, "high": 64718}, {"year": 2011, "age": 4, "low": 60541, "medium": 60833, "high": 61312}, {"year": 2011, "age": 5, "low": 60029, "medium": 60309, "high": 60765}, {"year": 2011, "age": 6, "low": 58950, "medium": 59217, "high": 59648}, {"year": 2011, "age": 7, "low": 57702, "medium": 57958, "high": 58367}, {"year": 2011, "age": 8, "low": 57242, "medium": 57489, "high": 57880}, {"year": 2011, "age": 9, "low": 58444, "medium": 58683, "high": 59060}, {"year": 2011, "age": 10, "low": 59637, "medium": 59869, "high": 60235}, {"year": 2011, "age": 11, "low": 59226, "medium": 59450, "high": 59804}, {"year": 2011, "age": 12, "low": 59168, "medium": 59384, "high": 59724}, {"year": 2011, "age": 13, "low": 59798, "medium": 60008, "high": 60338}, {"year": 2011, "age": 14, "low": 60090, "medium": 60297, "high": 60621}, {"year": 2011, "age": 15, "low": 60697, "medium": 60912, "high": 61245}, {"year": 2011, "age": 16, 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