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Letter Count Bar Chart

✓ Published0🌍 Public

Last edited Aug 28, 2018

Created on Aug 27, 2018

A bar chart displays the frequency of each letter in an input text file, updating dynamically as the user edits the text. The D3.js v4 code uses `d3.text` to load the file, `d3.map` and `countLetters` to count occurrences, and `d3.scaleLinear` and `d3.scaleBand` for axes. The SVG chart renders bars and axes, with a `keyup` event listener triggering redraws.

AI-generated description

Letter Count Bar Chart

In this demo, we asynchronously load a text file, use JavaScript to count the number of times each letter appears in that file, and generate a bar chart showing the letter count in D3.js v4.

This is meant to be an introductory demo to expose students to HTML, CSS, JavaScript, D3.js, bl.ocks.org, and blockbuilder.org for the first time.

References

This is based off the following example:

http://bl.ocks.org/sjengle/e8c0d6abc0a8d52d4b11

It has been updated for D3.js v4 based on the following updated bar chart example:

https://bl.ocks.org/mbostock/3885304

Please see the original examples for videos and additional references.

forked from <a href='http://bl.ocks.org/sjengle/'>sjengle</a>'s block: <a href='http://bl.ocks.org/sjengle/1e23258249638a508426470a48ff2924'>Letter Count Bar Chart (d3v4)</a>

forked from <a href='http://bl.ocks.org/alark/'>alark</a>'s block: <a href='http://bl.ocks.org/alark/51a1e33da99f0c0457b8baf587c04860'>Letter Count Bar Chart (d3v4)_2</a>

mit Licensed

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