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JavaScript: SVG bar chart using D3
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1. Representing and processing count data
Here are links to the topic series of representing and processing data. R examples: Python examples: JavaScript and D3 examples: Julia examples: ... more to be added ... This page looks at using JavaScript and D3 to create a SVG bar chart.

2. Data
To keep things simple data that is hard-coded in the JavaScript is used.

Here is the data used in JSON form.
[ ["a",59900], ["b",11302], ["c",14311], ["d",34483], ["e",95247], ["f",17852], ["g",13528], ["h",62509], ["i",46347], ["j",2321], ["k",4449], ["l",25939], ["m",19154], ["n",51311], ["o",54741], ["p",9918], ["q",183], ["r",37468], ["s",44630], ["t",72396], ["u",20651], ["v",7458], ["w",18376], ["x",376], ["y",14814], ["z",234] ]

JSON is the built-in form that JavaScript uses so it is easy to hard-code the above data in JavaScript code, as done below. Here is the CSS used for the SVG examples.

The rmsSvg is for all SVG (Scalable Vector Graphics) images and puts a obvious border around the SVG for demonstration purposes.

3. SVG code
Here is the SVG code [#1]

Notice that the SVG code is empty. It is a placeholder for JavaScript to use D3 to fill in.

4. SVG chart
Here is how the SVG code appears.

5. JavaScript code
Here is the JavaScript code. The hard-coded data needs a variable name. A semicolon after the data is recommended (required in strict mode).


6. JavaScript code notes

7. Using D3 shortcut methods
The same chart is now done using some D3 shortcut methods.

... more to be added ...

8. End of page

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