This example demonstrates using the Fetch API and Promises, in conjunction with d3-dsv, to load a few CSV files in parallel. Compare this to using d3-queue, which also allows configurable concurrency.
forked from mbostock's block: Fetching CSV
Created
June 22, 2016 16:26
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Fetching CSV
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| license: gpl-3.0 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| h1 { | |
| text-align: center; | |
| font-family: "Helvetica Neue"; | |
| font-size: 96px; | |
| line-height: 350px; | |
| } | |
| </style> | |
| <h1>1 + 2 + 3 = <span id="result">?</span></h1> | |
| <script src="https://d3js.org/d3-dsv.v0.3.min.js"></script> | |
| <script> | |
| Promise.all([ | |
| "one.csv", | |
| "two.csv", | |
| "three.csv" | |
| ].map(function(url) { | |
| return fetch(url).then(function(response) { | |
| return response.ok ? response.text() : Promise.reject(response.status); | |
| }).then(function(text) { | |
| return d3_dsv.csvParse(text); | |
| }); | |
| })).then(function(value) { | |
| var one = +value[0][0].number, | |
| two = +value[1][0].number, | |
| three = +value[2][0].number; | |
| document.querySelector("#result").textContent = one + two + three; | |
| }); | |
| </script> |
We can make this file beautiful and searchable if this error is corrected: No commas found in this CSV file in line 0.
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
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| number | |
| 1 |
We can make this file beautiful and searchable if this error is corrected: No commas found in this CSV file in line 0.
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
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| number | |
| 3 |
We can make this file beautiful and searchable if this error is corrected: No commas found in this CSV file in line 0.
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| number | |
| 2 |
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