Can't see circles in d3.js
Question
I'm trying to create a scatter plot and while my axes are rendered, I can't see any circles. I can't figure out what's wrong.
I realized that my data values are in string so I used '+' operator. Still doesn't work. There is no error message. I can see the elements in debug window being created but they are not displayed.
Here is my code:
function visualize(data) {
var margin = { top: 20, bottom: 80, right:50, left: 70 };
var width = 720 - margin.left + margin.right, height = 500 - margin.top - margin.bottom;
var svg = d3.select("body")
.append("svg")
.attr("height", height + margin.top + margin.bottom)
.attr("width", width + margin.right + margin.left);
g=svg.append("g")
.attr("transform","translate("+margin.left+","+margin.top+")");
var xScale = d3.scaleLinear().domain(d3.extent(data,function(d) {
return +d.FTAG;
})).range([0, width]);
var yScale = d3.scaleLinear().domain([0,d3.max(data,function(d) { return +d["AF"]; })]).range([height, 0]);
var xAxis = d3.axisBottom(xScale);
var yAxis = d3.axisLeft(yScale);
g.append("g").attr("class", "x-axis").attr("transform", "translate(0," + height + ")").call(xAxis);
g.append("g").attr("class", "y-axis").attr("transform", "translate(0,0)").call(yAxis);
d3.selectAll("dot").data(data)
.enter()
.append("g")
.append("circle")
.attr("r", 20)
.attr("cx",
function(d) {
return xScale(+d.FTAG);
})
.attr("cy",
function(d) {
return yScale(+d.AF);
})
.style("fill",
function(d) {
if (+d.AF >= 20) {
return "red";
} else
return "steelblue";
})
.style("stroke","black")
.style("stroke-width",1.5);
}
1 answers
solution1
3 2017-05-16 06:30:27
In your code...
d3.selectAll("dot")
.data(data)
.enter()
.append("g")
... doesn't append groups anywhere.
It has to be:
svg.selectAll("dot")
.data(data)
.enter()
.append("g")
Since svg is the selection that appends an SVG to the <body> .
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