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I want to change the colour of an axis for a simple d3.js (v4) graph. The y axis in the following image is an example of the finished product;
I suspect that the method I am using to achieve this a bit ugly and I believe that there should be an alternative per the description below that I do not yet understand.
The axis component is a combination of text, path and line elements which require alteration of their respective styles (stroke and fill).
At this point the only method I have found to change the colour of the components is by individually setting styles in the <style> section of the code...
.axisRed line{
stroke: red;
}
.axisRed path{
stroke: red;
}
.axisRed text{
fill: red;
}
...and applying that class to the y axis when appending it later in the JavaScript;
svg.append("g")
.attr("class", "axisRed")
.call(d3.axisLeft(y));
Is there a way that I can apply these styles via .style("<some style>", "<some value>") lines while appending the y axis rather than declaring in the <style> section?
An example with code is here.
I have tried trying to address the individual DOM components such as the 'domain' class, but without success. I suspect that I do not understand the hierarchy of the axis component well enough.
576
On D3 you have several options to style the elements:
Option A: Using style tag with your class:
axisRed line{
stroke: red;
}
.axisRed path{
stroke: red;
}
.axisRed text{
fill: red;
}
// apply applying that class to the y
svg.append("g")
.attr("class", "axisRed")
.call(d3.axisLeft(y));
Option B: Using style tag with auto-generate class:
D3 assign domain class for the axis line, and inside a group 'g' for every tick class tick line and text. Without define a particular class:
<style>
path.domain {
stroke: red;
}
.tick text {
fill:blue
}
</style
.
.
svg.append("g").call(d3.axisLeft(y));
// generate code
<path class="domain" stroke="#000" d="M-6,450.5H0.5V0.5H-6"></path>
<g class="tick" opacity="1" transform="translate(0,414)">
<line stroke="#000" x2="-6" y1="0.5" y2="0.5"></line>
<text fill="#000" x="-9" y="0.5" dy=".32em">50</text>
</g>
Option C:Inline at appening time
On D3 V3 you could do a more compact:
svg.append("line")
.style({
fill:"none",
stroke:"#f00",
"stroke-width":"10"
})
But on D3 V4, doesn't work. So I open a 'Issue': you can check and follow the progress here: https://github.com/d3/d3-selection/issues/82
** UPDATE ** On V4 you must include selection-multi:
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://d3js.org/d3-selection-multi.v0.4.min.js"></script>
and then use: styles intead style and attrs instead attr:
svg.append("line")
.styles({
fill:"none",
stroke:"#f00",
"stroke-width":"10"
})
for your example:
svg.selectAll(".domain")
.styles({ fill:"none", stroke:"#f00", "stroke-width":"1" });
Now you got a compact way to style your elements
Extra: you could style and attr any elements:
var svg = d3.select("body").append("svg")
.attrs({width:600, height:600})
.styles({
border:"1px",
"border-style":"solid",
"border-color":"#f00"})
Here's the plunker
123
To style them inline, just keep a reference to the added axis and select the components:
// Add the Y Axis
var axis = svg.append("g")
.call(d3.axisLeft(y));
axis.selectAll("line")
.style("stroke", "purple");
axis.selectAll("path")
.style("stroke", "green");
axis.selectAll("text")
.style("stroke", "blue");
Full example:
<!DOCTYPE html>
<meta charset="utf-8">
<body>
<!-- load the d3.js library -->
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
// set the dimensions and margins of the graph
var margin = {
top: 20,
right: 20,
bottom: 30,
left: 50
},
width = 960 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
// parse the date / time
var parseTime = d3.timeParse("%d-%b-%y");
// set the ranges
var x = d3.scaleTime().range([0, width]);
var y = d3.scaleLinear().range([height, 0]);
// define the line
var valueline = d3.line()
.x(function(d) {
return x(d.date);
})
.y(function(d) {
return y(d.close);
});
// append the svg obgect to the body of the page
// appends a 'group' element to 'svg'
// moves the 'group' element to the top left margin
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 data = [{
"date": "1-May-12",
"close": "58.13"
}, {
"date": "30-Apr-12",
"close": "53.98"
}, {
"date": "27-Apr-12",
"close": "67.00"
}, {
"date": "26-Apr-12",
"close": "89.70"
}, {
"date": "25-Apr-12",
"close": "99.00"
}, {
"date": "24-Apr-12",
"close": "130.28"
}, {
"date": "23-Apr-12",
"close": "166.70"
}, {
"date": "20-Apr-12",
"close": "234.98"
}, {
"date": "19-Apr-12",
"close": "345.44"
}, {
"date": "18-Apr-12",
"close": "443.34"
}, {
"date": "17-Apr-12",
"close": "543.70"
}, {
"date": "16-Apr-12",
"close": "580.13"
}, {
"date": "13-Apr-12",
"close": "605.23"
}, {
"date": "12-Apr-12",
"close": "622.77"
}, {
"date": "11-Apr-12",
"close": "626.20"
}, {
"date": "10-Apr-12",
"close": "628.44"
}, {
"date": "9-Apr-12",
"close": "636.23"
}, {
"date": "5-Apr-12",
"close": "633.68"
}, {
"date": "4-Apr-12",
"close": "624.31"
}, {
"date": "3-Apr-12",
"close": "629.32"
}, {
"date": "2-Apr-12",
"close": "618.63"
}, {
"date": "30-Mar-12",
"close": "599.55"
}, {
"date": "29-Mar-12",
"close": "609.86"
}, {
"date": "28-Mar-12",
"close": "617.62"
}, {
"date": "27-Mar-12",
"close": "614.48"
}, {
"date": "26-Mar-12",
"close": "606.98"
}];
// format the data
data.forEach(function(d) {
d.date = parseTime(d.date);
d.close = +d.close;
});
// Scale the range of the data
x.domain(d3.extent(data, function(d) {
return d.date;
}));
y.domain([0, d3.max(data, function(d) {
return d.close;
})]);
// Add the valueline path.
svg.append("path")
.data([data])
.attr("class", "line")
.attr("d", valueline)
.style("fill", "none")
.style("stroke", "steelblue");
// Add the X Axis
svg.append("g")
.attr("transform", "translate(0," + height + ")")
.call(d3.axisBottom(x));
// Add the Y Axis
var axis = svg.append("g")
.call(d3.axisLeft(y));
axis.selectAll("line")
.style("stroke", "purple")
axis.selectAll("path")
.style("stroke", "green")
axis.selectAll("text")
.style("stroke", "blue")
</script>
</body>For v5 you can use below code, Select domain and define stroke for which axis you need and append to svg.
yAxis = (g) =>
g
.attr("transform", `translate(${50} ${0})`)
.call((g) =>
g
.selectAll(".domain")
.attr("stroke-width", 0.3)
.attr("stroke", d3.schemePaired[7])
);
svg.append("g").call(yAxis);
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