jszip / Fil | Observable

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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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