I am trying to add a simple D3.js bar chart to a Ionic 2 project.
I imported d3 and installed the type definitions as follows:
npm install d3
npm install @types/d3 --save-dev --save-exact
I added the following in the TS file for the page:
import * as d3 from 'd3'
When running ionic serve it finds the definition file with no problem. When I try a simple chart example such as the following, it also works with no problem:
var sampleSVG = d3.select("#chart")
.append("svg")
.attr("width", 100)
.attr("height", 100);
sampleSVG.append("circle")
.style("stroke", "gray")
.style("fill", "white")
.attr("r", 40)
.attr("cx", 50)
.attr("cy", 50)
.on("mouseover", function(){d3.select(this).style("fill", "aliceblue");})
.on("mouseout", function(){d3.select(this).style("fill", "white");});
However, when I try the following simple barchart example, it doesn’t work:
var svg = d3.select("svg"),
margin = {top: 20, right: 20, bottom: 30, left: 40},
width = +svg.attr("width") - margin.left - margin.right,
height = +svg.attr("height") - margin.top - margin.bottom;
var x = d3.scaleBand().rangeRound([0, width]).padding(0.1),
y = d3.scaleLinear().rangeRound([height, 0]);
var g = svg.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
d3.tsv("data.tsv", function(d) {
d.frequency = +d.frequency;
return d;
}, function(error, data) {
if (error) throw error;
x.domain(data.map(function(d) { return d.letter; }));
y.domain([0, d3.max(data, function(d) { return d.frequency; })]);
g.append("g")
.attr("class", "axis axis--x")
.attr("transform", "translate(0," + height + ")")
.call(d3.axisBottom(x));
g.append("g")
.attr("class", "axis axis--y")
.call(d3.axisLeft(y).ticks(10, "%"))
.append("text")
.attr("transform", "rotate(-90)")
.attr("y", 6)
.attr("dy", "0.71em")
.attr("text-anchor", "end")
.text("Frequency");
g.selectAll(".bar")
.data(data)
.enter().append("rect")
.attr("class", "bar")
.attr("x", function(d) { return x(d.letter); })
.attr("y", function(d) { return y(d.frequency); })
.attr("width", x.bandwidth())
.attr("height", function(d) { return height - y(d.frequency); });
});
I get a list of undefined typescript errors (even though the definition file for D3 v4 was successfully imported):
[11:54:14] typescript: src/pages/page1/page1.ts, line: 35
Property 'frequency' does not exist on type 'DSVRowString'.
L34: d3.tsv("data.tsv", function(d) {
L35: d.frequency = +d.frequency;
L36: return d;
[11:54:14] typescript: src/pages/page1/page1.ts, line: 35
Property 'frequency' does not exist on type 'DSVRowString'.
L34: d3.tsv("data.tsv", function(d) {
L35: d.frequency = +d.frequency;
L36: return d;
[11:54:14] typescript: src/pages/page1/page1.ts, line: 40
Property 'letter' does not exist on type 'DSVRowString'.
L40: x.domain(data.map(function(d) { return d.letter; }));
L41: y.domain([0, d3.max(data, function(d) { return d.frequency; })]);
[11:54:14] typescript: src/pages/page1/page1.ts, line: 41
The type argument for type parameter 'T' cannot be inferred from the usage. Consider specifying the type
arguments explicitly. Type argument candidate 'DSVRowString' is not a valid type argument because it is not
a supertype of candidate 'string'.
L40: x.domain(data.map(function(d) { return d.letter; }));
L41: y.domain([0, d3.max(data, function(d) { return d.frequency; })]);
[11:54:14] typescript: src/pages/page1/page1.ts, line: 59
Argument of type 'DSVParsedArray<DSVRowString>' is not assignable to parameter of type '(this: BaseType,
datum: {}, index: number, groups: ArrayLike<BaseType> | BaseType[]) => {}[]'. Type
'DSVParsedArray<DSVRowString>' provides no match for the signature '(this: BaseType, datum: {}, index:
number, groups: ArrayLike<BaseType> | BaseType[]): {}[]'
L58: g.selectAll(".bar")
L59: .data(data)
L60: .enter().append("rect")
[11:54:14] transpile failed
Any suggestions?