Simple d3.js tooltips
A line chart plots stock closing prices over time, with a tooltip that reveals the exact date and price when hovering over a data point. The visualization uses d3.js to render SVG circles for each data point and a path for the line, reading time-series data from a CSV file. The tooltip is implemented using an HTML div that appears via d3 transitions on mouseover and mouseout events, positioning itself near the cursor using `d3.event.pageX` and `d3.event.pageY`. The chart axes employ `d3.svg.axis` with time and linear scales.
AI-generated descriptionThis is a follow on from the simple scatterplot used as an example in the book D3 Tips and Tricks.
It is aimed at demonstrating a simple tooltip using d3.js and should be taken in context with the text of the book which can be downloaded for free from Leanpub.