Published
Edited
Feb 8, 2022
1 fork
Importers
23 stars
url = "https://visionscarto.net/obs/jszip-demo/data.zip"
// Using a CORS proxy is sometimes necessary
A = fetch("https://cors-anywhere.herokuapp.com/" + url).then(zipreader)
penguins = A.get("penguins.csv").then(d3.csvParse)
zipreader = (fileDescriptor, { type = "string" } = {}) =>
fileDescriptor
.arrayBuffer()
.then(d => zip().loadAsync(d))
.then(
({ files }) =>
new Map(Object.keys(files).map(f => [f, files[f].async(type)]))
)
reader = zipreader(FileAttachment("datasets.zip"))
cars = reader.get("cars.csv").then(d3.csvParse)
readerUp = up.arrayBuffer()
.then(d => zip().loadAsync(d))
.then(
({ files }) =>
new Map(Object.keys(files).map(f => [f, files[f].async("string")]))
)
dir = [...readerUp.keys()]
zipreader(FileAttachment("arrow.zip"), { type: "arraybuffer" }).then((d) =>
arrow.Table.from(d.get("data.arrow"))
)
// In this example we save several arrays as csv files, and join them together in a zip file
// note: with this method, they don't seem to be compressed
created = {
const z = zip();
const data = {
hello: [{ a: "1", b: 2 }],
world: [{ some: "good", news: "maybe?" }],
cars,
penguins
};
for (let key in data) z.file(`${key}.csv`, d3.csvFormat(data[key]));
return z.generateAsync({ type: "blob" });
}
button(created, "files.zip")
// "https://bundle.run/jszip@3.5.0"
zip = require(await FileAttachment("jszip-3.5.0").url())
d3 = require("d3-dsv@3")
// https://observablehq.com/@jeremiak/download-data-button
button = (data, filename = 'data') => {
if (!data) throw new Error('Array of data required as first argument');
let downloadData;
if (filename.includes('.csv')) {
downloadData = new Blob([d3.csvFormat(data)], { type: "text/csv" });
} else if (filename.includes('.zip')) {
downloadData = new Blob([data], { type: "application/zip" });
} else {
downloadData = new Blob([JSON.stringify(data, null, 2)], {
type: "application/json"
});
}
const size = (downloadData.size / 1024).toFixed(0);
const button = DOM.download(
downloadData,
filename,
`Download ${filename} (~${size} KB)`
);
return button;
}
arrow = require("apache-arrow@6")
import { file } from "@jashkenas/inputs"
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