d3-v6-tip:d3.event未定义

zi8p0yeb  于 2023-06-06  发布在  其他
关注(0)|答案(3)|浏览(159)

mouseOver事件发生时,我正在尝试将工具提示添加到我的Map。mouseOver函数的目标是突出显示路径并显示提示。
我用的是d3-v6-tip
这就是我选择svg并调用tip函数的方式

var svg = d3.select("#mapDiv")
    .append("svg")
    .attr("width", width)
    .attr("height", height)
    .style("background-color", "white")
    .style("border", "solid 1px black")
    .call(d3.zoom()
        .on("zoom", function (event) {
            svg.attr("transform", event.transform);
        })
        .scaleExtent([1, 1])
    )
    .append("g");

const tip = d3.tip().attr('class', 'd3-tip').html(function (event, d) {
    console.log(event.target.id);
    return event.target.id;
});

svg.call(tip);

我是这样画Map的:

d3.json(path).then(function (json) {
    var projection = d3.geoMercator();
    var features = json.features;

    var fixed = features.map(function (feature) {
        return turf.rewind(feature, { reverse: true });
    })

    var geoPath = d3.geoPath().projection(projection);

    projection.fitSize([width, height], { "type": "FeatureCollection", "features": fixed })

    svg.selectAll("path")
        .data(fixed)
        .enter()
        .append("path")
        .attr("d", geoPath)
        .attr("id", function (d) { return d.properties.FIPS_10_; })
        .style("fill", "red")
        .style("stroke", "transparent")
        .on("mouseover", mouseOver)
        .on("mouseleave", mouseLeave)
        .on("click", mouseClick)
})

如何tip.show在mouseOver函数中调用www.example.com:

let mouseOver = function (event, d) {
    var countryCode = event.target.__data__.properties.FIPS_10_;  
    d3.selectAll("path#" + countryCode)
        .transition()
        .duration(200)
        .style("opacity", 1)
        .style("stroke", "black")

    tip.show(event, d);

}

问题:我在tip声明中输入了console.log。当我的鼠标悬停在它上面时,它在控制台中显示当前的国家名称(event.target.id)。但是,由于以下错误,工具提示从未显示:Uncaught TypeError: d3.event is undefined
我不完全确定这是否与库本身有关,因为当d3.event不再存在于d3.v6中时,源代码调用d3.event,或者我在代码中做错了什么
还有,有没有比使用库更好的方法来创建工具提示?

fcwjkofz

fcwjkofz1#

我把我的D3版本降级到5,现在它工作了。我认为D3-v6-tip库有问题,不知道为什么。

m1m5dgzv

m1m5dgzv2#

我相信你只是错过了调用提示的步骤。
检查页面显示'If you want to load it as standalone...'的下面的代码:

/* Invoke the tip in the context of your visualization */
svg.call(tip)

您的事件处理程序代码似乎可以根据此调整正常工作:

const width = 200;
const height = 200;
const svg = d3.select("body")
  .append("svg")
  .attr("width", width)
  .attr("height", height);
  
const tip = d3.tip()
  .attr("class", "d3-tip")
  .html((event, d) => event.target.id); 
  
const projection = d3.geoMercator();
const mapJson = roi();
const features = mapJson.features; 
const geoPath = d3.geoPath()
  .projection(projection);

projection.fitSize([width, height], mapJson);

svg.selectAll("path")
  .data(features)
  .enter()
  .append("path")
  .attr("d", geoPath)
  .attr("id", d => d.properties.id)
  .style("fill", "green")
  .style("stroke", "red")
  .on("mouseover", mouseOver)
  .on("mouseleave", mouseLeave)
  .on("click", mouseClick)
  .call(tip);
  
function mouseOver(event, d) {
  d3.selectAll(`path#${event.target.id}`)
    .transition()
    .duration(200)
    .style("opacity", 1)
    .style("stroke", "white");
  tip.show(event, d);
}

function mouseLeave(event, d) {
  d3.selectAll(`path#${event.target.id}`)
    .transition()
    .duration(200)
    .style("stroke", "red");
  tip.hide()
}

function mouseClick(event, d) {
  window.alert(`Selected ${d.properties.id}`);
}
<script src="https://d3js.org/d3.v6.min.js"></script>
<script src="https://unpkg.com/d3-v6-tip@1.0.6/build/d3-v6-tip.js"></script>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/gh/bumbeishvili/d3-tip-for-v6@4/d3-tip.min.css">
<script>
function roi() {
  return {
    "type": "FeatureCollection", 
    "features": [
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      { "type": "Feature", "properties": {  "id": "Cavan" } , "geometry": { "type": "Polygon", "coordinates": [ [ [ -7.311848, 54.114105 ], [ -7.188226, 54.079548 ], [ -7.035960, 54.086530 ], [ -6.753231, 53.901916 ], [ -6.753302, 53.900348 ], [ -6.779095, 53.873842 ], [ -6.942976, 53.874982 ], [ -6.955730, 53.766893 ], [ -7.275153, 53.783851 ], [ -7.282350, 53.795394 ], [ -7.394715, 53.781713 ], [ -7.471810, 53.835936 ], [ -7.577762, 53.872702 ], [ -7.606476, 53.937257 ], [ -7.604552, 54.005160 ], [ -7.760239, 54.105127 ], [ -7.853223, 54.098144 ], [ -8.034560, 54.238796 ], [ -7.952976, 54.306628 ], [ -7.878090, 54.289172 ], [ -7.820589, 54.199180 ], [ -7.696967, 54.202529 ], [ -7.554248, 54.127999 ], [ -7.414737, 54.150800 ], [ -7.311848, 54.114105 ] ] ] } },
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</script>

关于“更好的方法”,IMO这取决于你是否有库中没有涵盖的特定用例。此外,考虑到amount of work已经由库为我们完成,他们花了时间为D3 v6更新。

slmsl1lt

slmsl1lt3#

我也为此而挣扎。我通过NPM导入d3和d3-tip,用于我的Next/React应用程序。
1.“d3 is not defined”错误是因为d3在window对象上不是全局可用的。如果通过NPM导入d3和d3-tip,则使d3可用于窗口。把它放在你的代码中:
if (typeof window !== "undefined") { window.d3 = d3 }
1.请确保您正确遵循新的v6 API:对tip.html()tip.show()的调用需要在数据之前首先传递event,例如
function (event, d) {...}
不只是d。这就是为什么根据OP的建议降级到v5一开始对我有用--我没有这样做。这也可以解释为什么工具提示无法正确定位。
我希望这能帮助像我一样挣扎的人。我真的很感激这个伟大的小可靠,简单而优雅的工具提示,我已经广泛使用了多年,以及各种forker和维护人员的努力,以保持它与最新的d3版本兼容。

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