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我是流星和D3的初學者,目前我正在嘗試獲得M. Bostock(適應英國和歐洲地圖)的例子之一來工作。 http://bl.ocks.org/mbostock/9656675 創建顯示地圖作品完美,但點擊或者試圖放大時,會出現以下錯誤: Errors after click or zoom, d3.event is null流星和D3:d3.event爲空
令人驚訝的一切工作以http服務器(HTTP服務器這個例子中,當預期-p 8008 & )。
我知道D3完成事件(d3.event is null inside of debounced function)之後刪除該事件的變量,但我不知道是否這也可能導致流星這種行爲(以及如何解決這裏的話) 誰能給我一個提示,爲什麼在Meteor中d3.event總是爲空,以及如何處理這個問題?
我用下面一起來看流星包:
meteor add d3js:d3
meteor add garrilla:topojson
這裏是我的HTML:
<head>
\t <title>Map</title>
</head>
<body>
\t <header>
\t \t <h1 id="header-title">Title</h1>
\t </header>
\t <div id="vis-and-sidebar">
\t \t <div id="vis"></div>
\t \t <div id="sidebar"></div>
\t </div>
\t <div id="fixed-footer"></div>
\t <script src="//d3js.org/d3.v3.min.js" charset="utf-8"></script>
\t <script src="//d3js.org/topojson.v1.min.js"></script>
\t <script>
\t var visElem = d3.select("#vis");
var width = visElem.node().getBoundingClientRect().width,
height = visElem.node().getBoundingClientRect().height,
active = d3.select(null);
var projection = d3.geo.mercator()
.scale(550)
.translate([270, 1010]);
var zoom = d3.behavior.zoom()
.translate([0, 0])
.scale(1)
.scaleExtent([1, 8])
.on("zoom", zoomed);
var path = d3.geo.path()
.projection(projection);
var svg = d3.select("#vis").append("svg")
.attr("width", width)
.attr("height", height)
.on("click", stopped, true);
console.log("SVG-Objekt zum Zeichnen:");
console.log(svg);
svg.append("rect")
.attr("class", "background")
.attr("width", width)
.attr("height", height)
.on("click", reset);
var g = svg.append("g");
svg
.call(zoom) // delete this line to disable free zooming
.call(zoom.event);
d3.json("europe.json", function(error, europe) {
if (error) throw error;
g.selectAll("path")
.data(topojson.feature(europe, europe.objects.subunits).features)
.enter().append("path")
.attr("d", path)
.attr("class", "feature")
.on("click", clicked);
g.append("path")
.datum(topojson.mesh(europe, europe.objects.subunits, function(a, b) { return a !== b; }))
.attr("class", "mesh")
.attr("d", path);
});
function clicked(d) {
if (active.node() === this) return reset();
active.classed("active", false);
active = d3.select(this).classed("active", true);
var bounds = path.bounds(d),
dx = bounds[1][0] - bounds[0][0],
dy = bounds[1][1] - bounds[0][1],
x = (bounds[0][0] + bounds[1][0])/2,
y = (bounds[0][1] + bounds[1][1])/2,
scale = Math.max(1, Math.min(8, 0.9/Math.max(dx/width, dy/height))),
translate = [width/2 - scale * x, height/2 - scale * y];
svg.transition()
.duration(750)
.call(zoom.translate(translate).scale(scale).event);
}
function reset() {
active.classed("active", false);
active = d3.select(null);
svg.transition()
.duration(750)
.call(zoom.translate([0, 0]).scale(1).event);
}
function zoomed() {
console.log(d3.event);
g.style("stroke-width", 1.5/d3.event.scale + "px");
g.attr("transform", "translate(" + d3.event.translate + ")scale(" + d3.event.scale + ")");
}
// If the drag behavior prevents the default click,
// also stop propagation so we don’t click-to-zoom.
function stopped() {
if (d3.event.defaultPrevented) d3.event.stopPropagation();
}
</script>
</body>