We have the sample data of US States: Number of serious accidents reported for every state in US.
We have this data in three categories: Lowest reported number for a month, Average reported accidents in a year and Highest number reported in a month, as showed in below sample data.
We want to draw a US Map and visualize this data such that, when we hover mouse over a state, it should show this data for that particular state.
AZ: 13 41 57
CA: 41 60 81
NY: 6 35 54 and so on.
First , we will need to create a US map.
(script src="uStates.js")(/script) (!-- creates uStates. --)
Create Div tag to hold tooltip and create SVG to hold you map.
(div id="tooltip")(/div) (svg width="960" height="600" id="statesvg")(/svg)
Create Tooltip function to create html content string in tooltip div.
This tooltip function will return a table and this table will be shown whenever we hover mouse over the state Table should be something like this ( As shown in the first figure) : Arizona Low 13 Average 41 High 57
Draw states on id (d3-us-map-visulization#statesvg in our example ) with data and tooltip function.
uStates.draw("#statesvg", sampleData, tooltipFunc);
Final output will be something like this: ( Hovered the mouse over California )