javascript - Styling axis text: is this the best (or only) way to do it? -


i want style axis date/time text make day breaks more prominent.

enter image description here

based on bunch of qas here came function below. working on timeline based on brush & zoom example calling function on every brush , zoom event.

the timeline still performant wondering if there more efficient way this. haven't been using d3 (or js, matter) long i'm still cobbling things without entirely understanding going on , possible ramifications may result.

function styleaxis() {     d3.selectall('g.tick')         .select('text')         .style('fill', function (d) {             var txt = d3.select(this).text().split(" ");             var days = ["mon", "tue", "wed", "thu", "fri", "sat", "sun"]              if (days.indexof(txt[0]) != -1) {                 return "white"             } else {                 return "gray"             }         }); }

result:

enter image description here

just save lines of code, can select text element inside tickformat (despite not being purpose of tickformat) using this, when define line generator, , apply style want:

var axis = d3.axisbottom(scale)   .tickformat(function(d) {     if (d === "bar") {       d3.select(this).style("fill", "gray")     }     return d;   });

here demo:

var svg = d3.select("svg")  var scale = d3.scaleband()    .range([20, 280])    .domain(["foo", "bar", "baz"]);  var axis = d3.axisbottom(scale)    .tickformat(function(d) {      if (d === "bar") {        d3.select(this).style("fill", "gray")      }      return d;    });  var gx = svg.append("g")    .attr("transform", "translate(0,50)");  axis(gx);
<script src="https://d3js.org/d3.v4.min.js"></script>  <svg></svg>

in example, style depends on data. on other hand, if style doesn't depend on data (for instance, when want apply same style ticks), alternative shorter: apply style containing <g> element.

therefore, approach not one. regarding being best 1 prefer not saying anything, since opinion based , depends on several factors.


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