我是d3的新手,并试图弄清楚如何将鼠标悬停在地图中的多边形上时显示属性(“NAME”)。我知道我应该按照.on("mouseover", function(d,i) { some function that returns properties.NAME }
的方式做一些事情,但无法弄清楚从那里去哪里。这是写的js,它只是静态地在每个多边形上放置NAME属性:
<script>
var width = 950,
height = 650;
var projection = d3.geo.albers()
.scale(120000)
.center([22.85, 40.038]);
var path = d3.geo.path()
.projection(projection);
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
d3.json("newnabes.json", function(error, topology) {
var nabes = topojson.object(topology, topology.objects.temp);
svg.selectAll("path")
.data(nabes.geometries)
.enter().append("path")
.attr("d", path);
svg.selectAll(".subunit-label")
.data(nabes.geometries)
.enter().append("text")
.attr("class", function(d) { return "subunit-label " + d.id; })
.attr("transform", function(d) { return "translate(" + path.centroid(d) + ")"; })
.attr("dy", ".35em")
.text(function(d) { return d.properties.NAME; });
});
</script>
这是json的一小部分
{"type":"Topology",
"transform":{
"scale":[0.00003242681758896625,0.000024882264664420337],
"translate":[-75.28010087738252,39.889167081829875]},
"objects":{
"temp":{
"type":"GeometryCollection",
"geometries":[{
"type":"Polygon",
"id":1,
"arcs":[[0,1,2,3,4,5,6]],
"properties":{"NAME":"Haddington"}
},{
"type":"Polygon",
"id":2,
"arcs":[[7,8,9,10,-3,11]],
"properties":{"NAME":"Carroll Park"}
}...
由于
答案 0 :(得分:4)
所以我明白了,Show data on mouseover of circle
最简单的解决方案是将名称附加到svg title属性:
svg.selectAll("path")
.data(nabes.geometries)
.append("svg:title")
.attr("class", function(d) { return "path " + d.id; })
.attr("transform", function(d) { return "translate(" + path.centroid(d) + ")"; })
.attr("dy", ".35em")
.text(function(d) { return d.properties.NAME; });
仍然在研究一个更时尚的问题解决方案(例如,醉酒)。