javascript - 如何在 Leaflet 中获取 CountyId 或 StateId？

Question

我想在 Leaflet 中获取countyId

info.update = function (props) {
        if (props) {
            propsState = props.State;  //StateName
            propsName = props.name;    //CountyName
            propsRanking = props.Ranking;
        }
    };

以上代码仅获取 StateName 和 CountyName。我如何获得 CountyId 或 StateId？

Answer 1

您的问题是 ID 号比属性子对象高一级。GeoJSON 的布局如下：

var statesData = {
    "type": "FeatureCollection",
    "features": [
    {
        "type": "Feature",
        "id": "01",
        "properties": {
            "name": "Alabama",
            "density": 94.65
        },
        "geometry": { 
           //continues on for a long time...

中的代码highlightFeature function，即在 MouseOver 上运行的代码，传入 object layer.feature.properties。然后这成为props你的功能。如果您查看 GeoJSON，它比 ID 值低一级。

要解决此问题，layer.feature请改为传入，并将您的函数更改为以下内容：

info.update = function (feature) {
    if (feature) {
      var props = feature.properties;
      propsState = props.State;  //StateName
      propsName = props.name;    //CountyName
      propsID = feature.id;  //NOTE we are using feature here, NOT props
      propsRanking = props.Ranking;
    }
};