D3 v4 - Get the value of the each tick present on an axis?
Question
Using D3.js version 4, is there a way to get an array of the values for each tick on an axis?
Edit:
From D3 documentation
# axis.tickValues([values]) <>
If a values array is specified, the specified values are used for ticks rather than using the scale's automatic tick generator. If values is null, clears any previously-set explicit tick values and reverts back to the scale's tick generator. If values is not specified, returns the current tick values, which defaults to null.
I am using the automatic tick generator so if I call
var tickValues = axis.tickValues();
tickValues is null
2 answers
solution1
11 ACCPTED 2017-09-01 19:11:18
If you have a reference to the axis , you can use:
axis.scale().ticks()
If you want them all formatted out, I'd get them from the DOM:
d3.selectAll(".tick>text")
.nodes()
.map(function(t){
return t.innerHTML;
})
Running code:
<!DOCTYPE html> <meta charset="utf-8"> <svg width="960" height="500"></svg> <script src="//d3js.org/d3.v4.min.js"></script> <script> var svg = d3.select("svg"), margin = {top: 20, right: 0, bottom: 20, left: 0}, width = svg.attr("width") - margin.left - margin.right, height = svg.attr("height") - margin.top - margin.bottom, g = svg.append("g").attr("transform", "translate(" + margin.left + "," + margin.top + ")"); var x = d3.scalePoint() .domain([0, 1, 2]) .range([0, width]) .padding(1); var y = d3.scaleLinear() .domain([-1e6, 2e6]) .range([height, 0]); var axis = d3.axisLeft(y) .ticks(20, "s"); g.append("g") .attr("transform", "translate(" + x(0) + ",0)") .attr("class", "axis") .call(axis); console.log( axis.scale().ticks() ); console.log( d3.selectAll(".tick>text") .nodes() .map(function(t){ return t.innerHTML ; }) ); </script>
solution2
0 2020-09-21 09:37:27
I found the answer of Mark above was not correct for my case, I changed a bit from his inspiration and it worked
// I am using d3-scale
const yScale = scaleLinear().domain(realYDomain).range([30, 170]);
// I am using d3-axis
const yAxis = axisLeft(yScale); // Not declare axisLeft(scale).ticks(number) here, but below line instead
const tickValues = yAxis.scale().ticks(5);
console.log(tickValues);
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