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@abrahamdu
Last active Jan 14, 2018
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China Map with Province Name Tooltip v4
license: mit
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<!DOCTYPE html>
<head>
<meta charset="utf-8">
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://d3js.org/topojson.v2.min.js"></script>
<script src="https://d3js.org/d3-queue.v3.min.js"></script>
<style>
svg {
width: 100%;
height: 100%;
position: center;
}
.hidden {
display: none;
}
div.tooltip {
color: #222;
background: #fff;
border-radius: 3px;
box-shadow: 0px 0px 2px 0px #a6a6a6;
padding: .2em;
text-shadow: #f5f5f5 0 1px 0;
opacity: 0.9;
position: absolute;
}
</style>
</head>
<svg width="1200" height="900"></svg>
<div class="tooltip"></div>
<body>
<script>
var margin = {top: 10, right: 10, bottom: 10, left: 10};
var width = 1200 - margin.left - margin.right;
var height = 900 - margin.top - margin.bottom;
var color = d3.scaleOrdinal(d3.schemeCategory20c);
var projection = d3.geoMercator()
.center([110, 25])
.scale([800])
.translate([550,550])
.precision([.1]);
var path = d3.geoPath()
.projection(projection);
var svg = d3.select("svg")
.append("g")
.attr("width", width)
.attr("height", height);
var tooltip = d3.select("div.tooltip");
d3.json("china.geojson", function(error, china) {
if (error) throw error;
svg.selectAll("path")
.data(china.features)
.enter()
.append("path")
.attr("stroke","grey")
.attr("stroke-width",1)
.attr("fill", function(d,i){
return color(i);
})
.attr("d", path )
.on("mouseover",function(d,i){
d3.select(this).attr("fill","grey").attr("stroke-width",2);
return tooltip.style("hidden", false).html(d.properties.name);
})
.on("mousemove",function(d){
tooltip.classed("hidden", false)
.style("top", (d3.event.pageY) + "px")
.style("left", (d3.event.pageX+10) + "px")
.html(d.properties.name);
})
.on("mouseout",function(d,i){
d3.select(this).attr("fill",color(i)).attr("stroke-width",1);
tooltip.classed("hidden", true);
});
});
</script>
</body>
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