I have been working on creating a basic bar chart using financial data in JSON format.
An error message keeps appearing when I try to utilize my parsed time data. Despite console logging the data and verifying that it has been parsed correctly, I encounter this peculiar error:
d3.v3.min.js:1 Uncaught TypeError: Cannot read property 'getHours' of undefined
at H (d3.v3.min.js:1)
at SVGTextElement.t (d3.v3.min.js:1)
at SVGTextElement.arguments.length.each.function.n.textContent (d3.v3.min.js:3)
at d3.v3.min.js:3
at Y (d3.v3.min.js:1)
at Array.Co.each (d3.v3.min.js:3)
at Array.Co.text (d3.v3.min.js:3)
at SVGGElement.<anonymous> (d3.v3.min.js:5)
at d3.v3.min.js:3
at Y (d3.v3.min.js:1)
This issue is challenging to troubleshoot as the error points towards d3.v3.min.js rather than any specific part of my code. My suspicion is that the problem lies within the `d3.extent` function used for the x-axis instead of `d3.max`.
The section causing the error is represented by the following code snippet:
<!DOCTYPE html>
<meta charset="utf-8">
<head>
<style>
.axis {
font: 10px sans-serif;
}
.axis path,
.axis line {
fill: none;
stroke: #000;
shape-rendering: crispEdges;
}
</style>
</head>
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script>
var margin = {top: 20, right: 20, bottom: 70, left: 40},
width = 600 - margin.left - margin.right,
height = 300 - margin.top - margin.bottom;
// Parse the date / time
var parseDate = d3.time.format("%H:%M:%S.%L").parse;
var x = d3.scale.ordinal().rangeRoundBands([0, width], .05);
var y = d3.scale.linear().range([height, 0]);
var xAxis = d3.svg.axis()
.scale(x)
.orient("bottom")
.tickFormat(d3.time.format("%H:%M:%S.%L"));
var yAxis = d3.svg.axis()
.scale(y)
.orient("left")
.ticks(10);
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 + ")");
d3.json("https://gist.githubusercontent.com/kvyb/cba0e652b7fd9349604cf45ced75fbf9/raw/3f824e76c38479a1a327abbb5c85a5962fec6f21/schudata.json", function(error, data) {
data["bboList"].forEach(function(d) {
d.timeStr = parseDate(d.timeStr);
d.value = +d.ask;
console.log(d.timeStr)
});
x.domain(d3.extent(data, function(d) { return d.timeStr; }));
y.domain([0, d3.max(data, function(d) { return d.value; })]);
svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis)
.selectAll("text")
.style("text-anchor", "end")
.attr("dx", "-.8em")
.attr("dy", "-.55em")
.attr("transform", "rotate(-90)" );
svg.append("g")
.attr("class", "y axis")
.call(yAxis)
.append("text")
.attr("transform", "rotate(-90)")
.attr("y", 6)
.attr("dy", ".71em")
.style("text-anchor", "end")
.text("Value ($)");
svg.selectAll("bar")
.data(data)
.enter().append("rect")
.style("fill", "steelblue")
.attr("x", function(d) { return x(d.timeStr); })
.attr("width", x.rangeBand())
.attr("y", function(d) { return y(d.value); })
.attr("height", function(d) { return height - y(d.value); });
});
</script>
</body>
P.S.
Another issue not directly related to this question is worth mentioning.
In order to render the bars properly, I made the following replacement:
var x = d3.scale.ordinal().rangeRoundBands([0, width], .05);
replaced with
var x = d3.time.scale().range([0, width]);
and adjusted the width of the bars to a fixed value.