simple line chart from dataset
This example shows a simple line chart of monthly values from a local JSON dataset, with labeled date tick marks and a grey line connecting data points. Each data point is a semi-transparent grey circle that highlights in red with a black value label and connecting dashed line on mouseover, then reverts on mouseout. The chart uses D3 version 3 APIs including `d3.scale.ordinal` for the x-axis, `d3.scale.linear` for the y-axis, and `d3.svg.line` to create the line path. SVG elements are rendered directly via `d3.select("body").append("svg")`, and the data is loaded with `d3.json`.
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forked from <a href='http://bl.ocks.org/romsson/'>romsson</a>'s block: <a href='http://bl.ocks.org/romsson/855207ac5fb5c170de59b9c69ea56012'>simple line chart from dataset</a>