javascript - Using D3.js to create a bar chart that transforms on button click by loading tsv data -


i'm trying create bar chart using d3.js in order show population against different towns, however, i've found when try create transition between 2 different sets of data (in tsv format), d3.js won't trigger , fire off animation second set of data. i'm unsure of i'm doing wrong.

this current code have.

<div id="options">  <button id="set1">2016</button>  <button onclick="update2021()" id="set2">2021</button>  <button id="set2">2026</button>  <button id="set2">2031</button>  <button id="set2">2036</button>  <button id="set2">2041</button>  <button id="set2">2046</button>  <button id="set2">2050</button>  <svg width="3000" height="500"></svg>  <script>     var svg = d3.select("svg"),         margin = {top: 20, right: 20, bottom: 30, left: 40},         width = +svg.attr("width") - margin.left - margin.right,         height = +svg.attr("height") - margin.top - margin.bottom;      var x = d3.scaleband().rangeround([0, width]).padding(0.1),         y = d3.scalelinear().rangeround([height, 0]);      var g = svg.append("g")         .attr("transform", "translate(" + margin.left + "," + margin.top + ")");      d3.tsv("sydtest.tsv", function(d) {       d.population = +d.population;       return d;     }, function(error, data) {       if (error) throw error;        x.domain(data.map(function(d) { return d.lga; }));       y.domain([0, d3.max(data, function(d) { return d.population; })]);        g.append("g")           .attr("class", "axis axis--x")           .attr("transform", "translate(0," + height + ")")           .call(d3.axisbottom(x));      // y-axis code       g.append("g")           .attr("class", "axis axis--y")           .call(d3.axisleft(y).ticks(25))        g.selectall(".bar")         .data(data)         .enter().append("rect")           .attr("class", "bar")           .attr("x", function(d) { return x(d.lga); })           .attr("y", function(d) { return y(d.population); })           .attr("width", x.bandwidth())           .attr("height", function(d) { return height - y(d.population); });     });  function update2021() {          // data again             d3.tsv("sydtest.tsv", function(d) {               d.population = +d.population;               return d;             }, function(error, data) {               if (error) throw error;          // scale range of data again          x.domain(data.map(function(d) { return d.lga; }));         y.domain([0, d3.max(data, function(d) { return d.population; })]);      // select section want apply our changes     var svg = d3.select("svg").transition();      // make changes         svg.select(".bar")   // change line             data(data)             .enter().append("rect")             .attr("class", "bar")             .attr("x", function(d) { return x(d.lga); })             .attr("y", function(d) { return y(d.population); })             .attr("width", x.bandwidth())             .attr("height", function(d) { return height - y(d.population); });         svg.select("axis--x") // change x axis             .duration(750)             .call(g);         svg.select("axis--y") // change y axis             .duration(750)             .call(g);     }); } </script>

i've followed code has been written previously, , found y-axis , x-axis animate, data self wouldn't render on canvas. deduce i've written 'transition' part of code wrong.

if can show me if i've implemented transition code incorrectly, i'd grateful!


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