问题描述
我正在使用链接中的代码在d3地图中实现工具提示 http://bl.ocks.org/michellechandra/0b2ce4923dc9b5809922
I am implementing tooltip in my d3 maps using the code from linkhttp://bl.ocks.org/michellechandra/0b2ce4923dc9b5809922
当我在我的angular 2打字稿文件中编写相同的代码时.我收到错误消息:
When I write the same code in my angular 2 typescript file. I get error:
无法读取未定义的属性"transition"
Cannot read property 'transition' of undefined
基本上,它无法找到d3.event(将其获取为null),而这在JavaScript代码中不会发生.我在ngAfterViewInit中的代码
it is basically not able to find d3.event (getting it as null) which does not happen in javascript code.My code in ngAfterViewInit
ngAfterViewInit() {
this.tooltip = d3.select("map-tag")
.append("div")
.attr("class", "tooltip")
.style("opacity", 0);
this.svgContainer = d3.select("map-tag").append("svg")
.attr("width", this.width)
.attr("height", this.height)
.style("border", "2px solid steelblue")
.call(this.zoom);
this.usaSVG = this.svgContainer
.append("path")
.attr("d", this.geoPath(this.usaFeatureCollection))
.style({ fill: "none", stroke: "black" });
this.geoPoint1 = {
"type": "MultiPoint", "coordinates": [[-80.6665134, 35.0539943]]
};
this.div = d3.select("map-tag")
.append("div")
.attr("class", "tooltip")
.style("opacity", 0);
this.pointPath = this.svgContainer.append("path").attr("d", this.geoPath(this.geoPoint1)).style("stroke", "#FFFFFF")
.on('mouseover', function (d, i) {
this.div.transition()
.duration(200)
.style("opacity", .9);
this.div.text("sample text")
.style("left", (d3.event.x) + "px") // I get error here
.style("top", (d3.event.y - 28) + "px");
})
.on('mouseout', function (d, i) { d3.select(this).style({ fill: 'black' }); });
}
/* Style for Custom Tooltip */
div.tooltip {
position: absolute;
text-align: center;
width: 60px;
height: 28px;
padding: 2px;
font: 12px sans-serif;
background: white;
border: 0px;
border-radius: 8px;
pointer-events: none;
}
推荐答案
您需要从d3导入事件,如下所示:
You need to import event from d3 as below :
Import {event, BaseEvent} from "d3-selection"
这篇关于在angular2打字稿代码中将d3.events获取为null的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!