Function d3.js:在mouseclick上交换topojson映射?
我正在用d3.js制作一个topojson地图。我在一个大的topojson中有三个数据集,它们绘制不同的地图,我想在mouseclick上交换地图 我想我可以通过向mouseclick事件添加一个函数并将结果放入Function d3.js:在mouseclick上交换topojson映射?,function,map,d3.js,mouseclick-event,geojson,Function,Map,D3.js,Mouseclick Event,Geojson,我正在用d3.js制作一个topojson地图。我在一个大的topojson中有三个数据集,它们绘制不同的地图,我想在mouseclick上交换地图 我想我可以通过向mouseclick事件添加一个函数并将结果放入.datum()操作符来实现这一点 更新:这是工作代码,谢谢Lars var mapPath = d3.geo.path().projection(mapProjection), jsondata, jsonobject, jsonobjectkeys,
.datum()
操作符来实现这一点
更新:这是工作代码,谢谢Lars
var mapPath = d3.geo.path().projection(mapProjection),
jsondata,
jsonobject,
jsonobjectkeys,
numberOfKeys,
currentMap
mapNumber;
d3.json("test.json", function(error, json){
if (error) return console.warn(error);
jsondata = json; //Store data in the variable "jsondata"
jsonobject = json.objects;
jsonobjectkeys = [];
numberOfKeys = 0;
//Get the maps(keys) from the jsonobject
for(var k in jsonobject) jsonobjectkeys.push(k);
//Find number of objects in jsondata
for (objects in jsonobject){
if((jsonobject).hasOwnProperty(objects)){
numberOfKeys++;
}
}
mapNumber = jsonobjectkeys[0];
currentMap = eval("jsonobject." + (mapNumber));
//Map
var mapSVG = d3.select(".the_map")
.append("svg")
.attr("width", mapW)
.attr("height", mapH);
mapSVG.append("path")
.datum(topojson.object(jsondata, currentMap))
.attr("d", mapPath)
.attr("width", mapW)
.attr("height", mapH)
.attr("class", "land");
//Timeline
//Create scale
var xScale = d3.scale.linear()
.domain([0, (numberOfKeys-1)])
.range([timelinePadding, timelineW - timelinePadding]);
//Axis
var xAxis = d3.svg.axis()
.scale(xScale)
.orient("bottom")
.ticks(numberOfKeys-1);
var timeline = d3.select("#timeline")
.append("svg")
.attr("width", timelineW)
.attr("height", timelineH);
timeline.append("g")
.attr("class", "axis")
.attr("transform", "translate(0, " + timelinePadding + ")")
.call(xAxis);
timeline.selectAll("circle")
.data(jsonobjectkeys)
.enter()
.append("circle")
.attr("width", timelineW)
.attr("height", timelineH)
.attr("cx", function(d,i){return xScale(i);})
.attr("cy", timelinePadding)
.attr("r", 7)
.attr("class", "events")
.style("cursor", "hand")
.on("click", function(d){
redrawMap(d);
});
function redrawMap(i){
currentMap = eval("jsonobject." + (i));
//Update
mapSVG.selectAll("path")
.datum(topojson.object(jsondata, currentMap))
.attr("d", mapPath);
}
});
原始代码,非工作代码:
var mapPath = d3.geo.path().projection(mapProjection),
jsondata,
jsonobject,
jsonobjectkeys,
numberOfKeys;
d3.json("test.json", function(error, json){
if (error) return console.warn(error);
jsondata = json; //Store data in the variable "jsondata"
jsonobject = json.objects;
jsonobjectkeys = [];
numberOfKeys = 0;
//Get the maps(keys) from the jsonobject
for(var k in jsonobject) jsonobjectkeys.push(k);
//Find number of objects in jsondata
for (objects in jsonobject){
if((jsonobject).hasOwnProperty(objects)){
numberOfKeys++;
}
}
var mapNumber = jsonobjectkeys[0];
var currentMap = eval("jsonobject." + (mapNumber));
currentMapData(mapNumber);
//Map
var mapSVG = d3.select(".the_map")
.append("svg")
.attr("width", mapW)
.attr("height", mapH);
mapSVG.append("path")
.datum(topojson.object(jsondata, currentMap))
.attr("d", mapPath)
.attr("width", mapW)
.attr("height", mapH)
.attr("class", "land");
//Timeline
//Create scale
var xScale = d3.scale.linear()
.domain([0, (numberOfKeys-1)])
.range([timelinePadding, timelineW - timelinePadding]);
//Axis
var xAxis = d3.svg.axis()
.scale(xScale)
.orient("bottom")
.ticks(numberOfKeys-1);
var timeline = d3.select("#timeline")
.append("svg")
.attr("width", timelineW)
.attr("height", timelineH);
timeline.append("g")
.attr("class", "axis")
.attr("transform", "translate(0, " + timelinePadding + ")")
.call(xAxis);
timeline.selectAll("circle")
.data(jsonobjectkeys)
.enter()
.append("circle")
.attr("width", timelineW)
.attr("height", timelineH)
.attr("cx", function(d,i){return xScale(i);})
.attr("cy", timelinePadding)
.attr("r", 7)
.attr("class", "events")
.style("cursor", "hand")
.on("click", function(d,i){
currentMapData(i);
});
function currentMapData(i){
mapNumber = jsonobjectkeys[i];
console.log("showing this map: " + mapNumber);
currentMap = eval("jsonobject." + (mapNumber));
return currentMap;
}
});
看起来您正在将对象键绑定为数据,但希望在
currentMapData()
中接收索引。因此,您看到的错误是由于您试图使用一个键来索引数组而导致的。通过使用onclick
处理程序的第二个参数,即replace,可以传递索引而不是键
.on("click", function(d){
currentMapData(d);
});
与
你说得对!我更新了代码,但是地图仍然没有改变。是否有其他地方我需要更改为代码,以便更新路径(我认为这足以更新数据属性)?您需要重新绘制所有元素。更多细节请参见(和第2部分)。谢谢你,Lars,我将试一试。我仍然不确定如何进行此操作,因为.datum()不计算进入和退出选择。如果不使用.enter(),我如何重新绘制?除了您的选择是隐式的之外,这一点也适用。因此,在更新数据之后,选择元素并调用函数重新绘制。它更类似于教程的第二部分,其中更新了现有元素。
.on("click", function(d, i){
currentMapData(i);
});