100%

Letter Count Bar Chart

✓ Published0🌍 Public

Last edited Aug 27, 2018

Created on Aug 24, 2018

This interactive bar chart visualizes the frequency of each letter in the text of *Peter Piper*. The visualization loads a text file asynchronously using `d3.text`, counts letter occurrences with JavaScript, and renders the results as an SVG bar chart using D3.js v4. The chart updates dynamically with each keystroke in a textarea, utilizing `d3.scaleLinear`, `d3.scaleBand`, and `d3.axisBottom`/`d3.axisLeft` for scales and axes. The code demonstrates D3’s enter/update/exit pattern for animated transitions between data states.

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/78ae4d0395be9900e7b88c33bcb5a208'>Letter Count Bar Chart (d3v4)</a>

mit Licensed

Similar vizzes

Loading thumbnail…

Letter Count Bar Chart

A bar chart displays the frequency of each letter in the text of "Peter Piper," loaded asynchronously via `d3.text`. The chart updates live as users type in a textarea, using `d3.scaleBand`, `d3.scaleLinear`, and `d3.axisBottom`/`d3.axisRight` to render SVG bars and axes. Enter and update selections handle dynamic data changes, with a key-based data join for smooth transitions.

115Dkatz

95% match

Loading thumbnail…

Letter Count Bar Chart

This interactive bar chart visualizes the frequency of each letter in a text file, updating live as the user types in a textarea. The chart loads Peter Piper’s tongue twister asynchronously via `d3.text`, counts characters with JavaScript, and renders SVG rectangles using `d3.scaleLinear` and `d3.scaleBand`. Axes are drawn with `d3.axisBottom` and `d3.axisRight`, and the chart animates with D3’s enter/update/exit pattern on each `keyup` event.

115Dkatz

94% match

Loading thumbnail…

Letter Count Bar Chart

This example demonstrates a bar chart that visualizes the frequency of each letter in a text excerpt from the Peter Piper nursery rhyme. It asynchronously loads the text file via `d3.text`, counts letters using JavaScript `Map` objects, and renders the chart with SVG rectangles. The visualization uses D3 v5 scales (`scaleLinear`, `scaleBand`) and axes (`axisBottom`, `axisRight`) to map counts to bar heights, with interactive updates triggered by `keyup` events on a textarea.

SSophie Engle

93% match

Loading thumbnail…

Letter Count Bar Chart

This interactive bar chart displays the frequency of each letter in the text of the “Peter Piper” nursery rhyme, loaded asynchronously via `d3.text()`. Users can edit the text in a textarea to update the counts live, with the visualization re-rendering on each keyup event. The chart uses D3 v5 scales (`d3.scaleLinear` for counts, `d3.scaleBand` for letters), SVG rectangles for bars, and axes (`d3.axisBottom`, `d3.axisRight`). Letter counting is implemented in JavaScript with a `Map` object, and updates use D3’s data join.

Pphamiter253

93% match

Loading thumbnail…

Letter Count Bar Chart

This interactive bar chart displays the frequency of each letter in a text file loaded asynchronously via `d3.text`. The visualization updates in real time as users type into a textarea, triggering a redraw of the SVG bars through a `keyup` event. Letter counts are computed client-side with a `d3.map`, while vertical spacing uses `d3.scaleLinear` and horizontal categories use `d3.scaleBand`. The chart renders its axes with `d3.axisBottom` and `d3.axisRight`, and includes SVG animation for enter/update transitions.

SShuangjiaoHu

88% match

Loading thumbnail…

Letter Count Bar Chart

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.

SShuangjiaoHu

87% match

Loading thumbnail…

Letter Count Visulization

This interactive letter-count visualization displays the frequency of each alphabetic character in a user-editable text area. It dynamically updates an SVG bar chart as the text changes, using D3.js v3 scales and axes to map letter counts to bar heights. The visualization loads initial text from a local file and animates bar transitions via D3 transitions when the input is modified.

Mmrharis1

78% match

Loading thumbnail…

Bar Chart

This bar chart displays the frequency of each letter in the English language, with letters arranged along the x-axis and their proportional occurrence on the y-axis. It uses D3 v4 with SVG rendering, parsing tab-separated values from a TSV file via `d3.tsv` and `d3.dsv`. The chart applies conventional margins and employs `d3.scaleBand` for the categorical x-axis, `d3.scaleLinear` for the continuous y-axis, and `d3.axis` components for tick marks. Hovering over a bar changes its fill from steelblue to brown, as defined in the CSS.

GGolodhros

77% match