javascript - how do I labels to the axis in this d3 example -


i figured out how enter data d3 chart can't seem figure out how put labels on both x , y axis. looking put strings values in x-axis. appreciated. thank 

<!doctype html> <meta charset="utf-8"> <style>  body {   font-family: "helvetica neue", helvetica, arial, sans-serif;   margin: auto;   position: relative;   width: 960px; }  text {   font: 10px sans-serif; }  .axis path, .axis line {   fill: none;   stroke: #000;   shape-rendering: crispedges; }  form {   position: absolute;   right: 10px;   top: 10px; }  </style> <form>   <label><input type="radio" name="mode" value="grouped"> grouped</label>   <label><input type="radio" name="mode" value="stacked" checked> stacked</label> </form> <script src="http://d3js.org/d3.v3.min.js"></script> <script>  var n = 3, // number of layers     m = 3, // number of samples per layer     stack = d3.layout.stack(),     // layers = stack(d3.range(n).map(function() { return bumplayer(m, .1); })),     layers = [                 [                     {"x":0,"y":200,"y0":0},                     {"x":1,"y":150,"y0":0},                     {"x":2,"y":100,"y0":0}                 ],                 [                     {"x":0,"y":100,"y0":1},                     {"x":1,"y":80,"y0":1},                     {"x":2,"y":70,"y0":1}                 ],                 [                     {"x":0,"y":30,"y0":2},                     {"x":1,"y":40,"y0":2},                     {"x":2,"y":50,"y0":2}                 ]             ];     ygroupmax = d3.max(layers, function(layer) { return d3.max(layer, function(d) { return d.y; }); }),     ystackmax = d3.max(layers, function(layer) { return d3.max(layer, function(d) { return d.y0 + d.y; }); });  console.log(layers);   var margin = {top: 40, right: 10, bottom: 20, left: 10},     width = 960 - margin.left - margin.right,     height = 500 - margin.top - margin.bottom;  var x = d3.scale.ordinal()     .domain(d3.range(m))     .rangeroundbands([0, width], .08);  var y = d3.scale.linear()     .domain([0, ystackmax])     .range([height, 0]);  var color = d3.scale.linear()     .domain([0, n - 1])     .range(["#aad", "#556"]);  // var formataxis = d3.format("  0"); // var axis = d3.svg.axis() //         .scale(xscale) //         .tickformat(formataxis) //         .ticks(3) //         .tickvalues([100, 200, 300]) //specify array here values //         .orient("bottom");  var xaxis = d3.svg.axis()     .scale(x)     .ticksize(0)     .tickpadding(6)     .orient("bottom");   var svg = d3.select("body").append("svg")     .attr("width", width + margin.left + margin.right)     .attr("height", height + margin.top + margin.bottom)   .append("g")     .attr("transform", "translate(" + margin.left + "," + margin.top + ")");  var layer = svg.selectall(".layer")     .data(layers)   .enter().append("g")     .attr("class", "layer")     .style("fill", function(d, i) { return color(i); });  var rect = layer.selectall("rect")     .data(function(d) { return d; })   .enter().append("rect")     .attr("x", function(d) { return x(d.x); })     .attr("y", height)     .attr("width", x.rangeband())     .attr("height", 0);  rect.transition()     .delay(function(d, i) { return * 10; })     .attr("y", function(d) { return y(d.y0 + d.y); })     .attr("height", function(d) { return y(d.y0) - y(d.y0 + d.y); });  svg.append("g")     .attr("class", "x axis")     .attr("transform", "translate(0," + height + ")")     .call(xaxis);  d3.selectall("input").on("change", change);  var timeout = settimeout(function() {   d3.select("input[value=\"grouped\"]").property("checked", true).each(change); }, 2000);  function change() {   cleartimeout(timeout);   if (this.value === "grouped") transitiongrouped();   else transitionstacked(); }  function transitiongrouped() {   y.domain([0, ygroupmax]);    rect.transition()       .duration(500)       .delay(function(d, i) { return * 10; })       .attr("x", function(d, i, j) { return x(d.x) + x.rangeband() / n * j; })       .attr("width", x.rangeband() / n)     .transition()       .attr("y", function(d) { return y(d.y); })       .attr("height", function(d) { return height - y(d.y); }); }  function transitionstacked() {   y.domain([0, ystackmax]);    rect.transition()       .duration(500)       .delay(function(d, i) { return * 10; })       .attr("y", function(d) { return y(d.y0 + d.y); })       .attr("height", function(d) { return y(d.y0) - y(d.y0 + d.y); })     .transition()       .attr("x", function(d) { return x(d.x); })       .attr("width", x.rangeband()); }  // inspired lee byron's test data generator. // function bumplayer(n, o) {  //   function bump(a) { //     var x = 1 / (.1 + math.random()), //         y = 2 * math.random() - .5, //         z = 10 / (.1 + math.random()); //     (var = 0; < n; i++) { //       var w = (i / n - y) * z; //       a[i] += x * math.exp(-w * w); //     } //   }  //   var = [], i; //   (i = 0; < n; ++i) a[i] = o + o * math.random(); //   (i = 0; < 5; ++i) bump(a); //   return a.map(function(d, i) { return {x: i, y: math.max(0, d)}; }); // }  </script>

have looked tickformat? see fiddle.

here code of interest:

var xaxis = d3.svg.axis()     .scale(x)     .ticksize(2)     .tickpadding(6)     .tickformat(function(d) { return "test" + d; })     .orient("bottom");

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