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13-successful-named-source.html
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13-successful-named-source.html
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<!DOCTYPE html>
<html>
<head>
<script src="https://cdnjs.cloudflare.com/ajax/libs/core-js/2.6.11/core.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-polyfill/7.8.7/polyfill.js"></script>
<script src="https://vega.github.io/vega/assets/promise.min.js"></script>
<script src="https://vega.github.io/vega/assets/symbol.min.js"></script>
<script src="https://vega.github.io/vega/assets/fetch.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/vega@5"></script>
<script src="https://cdn.jsdelivr.net/npm/vega@5/build-es5/vega.js"></script>
<script src="https://cdn.jsdelivr.net/npm/vega-lite@4/build-es5/vega-lite.js"></script>
<script src="https://cdn.jsdelivr.net/npm/vega-embed@6/build-es5/vega-embed.js"></script>
<!--D3-->
<script src="https://d3js.org/d3.v5.min.js"></script>
<!--CSS-->
<link rel="stylesheet" href="css/style.css">
</head>
<body>
<style>
body {
max-width: 700px;
margin: auto;
}
#container {
max-width: 700px;
}
.chartdest {
width: 100%;
height: 250px;
margin-bottom: 50px;
}
code {
color: white;
background-color: rgb(73, 73, 73);
padding-left: 3px;
padding-right: 3px;
}
</style>
<div id="container">
<h1>Using a named data source in Vega-Lite</h1>
<p>This uses <code>data.name</code> in the chart spec, and <a href="https://vega.github.io/vega-lite/docs/data.html#named">vegaEmbed with Vega-View</a> to load data at runtime and update the chart.</p>
<p>This really doesn't want null values in <code>encoding.y.title</code> and <code>encoding.x.title</code> - so ensuring those are populated makes this work. <code>"title": " "</code> works where <code>"title": null</code> does not, FYI.</p>
<p>Additionally, this creates a calculated field within vega-Lite, using parseFloat to add columns to create a new one.</p>
<div id="vis2" class="chartdest"></div>
</div>
<script type="text/javascript">
var trendData;
// d3 pulls in data, dumps it into trendData variable, and runs embed
d3.csv("https://raw.githubusercontent.com/nychealth/coronavirus-data/master/trends/data-by-day.csv").then(data => {
trendData = data;
embed('#vis2', spec,'lineData', trendData) ;
});
var spec = {
$schema: "https://vega.github.io/schema/vega-lite/v5.json",
description: "Test rate over time",
width: "container",
height: 250,
config: {
bar: {
continuousBandSize: 1,
},
background: "#FFFFFF",
axisX: {
grid: false,
ticks: true,
labels: true,
},
axisY: {
domain: false,
ticks: false,
gridDash: [2],
gridWidth: 1,
titleAngle: 0,
titleX: -10,
titleY: -10
},
view: {
stroke: "transparent",
},
},
data: {
name: "lineData",
},
transform: [
{"calculate": "parseFloat(datum.CASE_COUNT) + parseFloat(datum.PROBABLE_CASE_COUNT)", "as": "TOTAL_CASE_COUNT"}
],
layer: [
{
mark: {
type: "bar",
point: null,
tooltip: true,
interpolate: "natural",
strokeWidth: 0.5,
},
encoding: {
x: {
field: "date_of_interest",
type: "temporal",
title: " "
},
y: {
field: "TOTAL_CASE_COUNT",
type: "quantitative"
},
color: {
value: "lightblue",
},
tooltip: [
{
field: "TOTAL_CASE_COUNT",
title: "New York City",
},
{
field: "date_of_interest",
type: "temporal",
title: "Week ending",
},
],
},
},
{
mark: {
type: "line",
point: null,
tooltip: true,
interpolate: "natural",
strokeWidth: 1.5,
},
encoding: {
x: {
field: "date_of_interest",
type: "temporal"
},
y: {
field: "ALL_CASE_COUNT_7DAY_AVG",
type: "quantitative",
title: "Total new cases"
},
color: {
value: "darkblue",
},
opacity: { value: 0.7 },
tooltip: [
{
field: "ALL_CASE_COUNT_7DAY_AVG",
title: "7-day average",
},
{
field: "date_of_interest",
type: "temporal",
title: "Week ending",
},
],
},
},
],
};
// embed passes in destination, spec, name (from chart spec), and variable with data, runs vegaEmbed/view
function embed(dest, spec, name, array) {
vegaEmbed(dest, spec).then(res =>
res.view
.insert(name, array)
.run()
);
}
</script>
</body>
</html>