清除传单地图中的所有折线

2022-01-12 00:00:00 leaflet javascript

我正在努力清除地图上的所有折线，我只清除最新的.

I am struggling to clear all polylines from my map, i only clear the newest.

var polylines;

// add map polylines
function addPolyline(polyArray, colour) {
    polylines = L.polyline(polyArray, {color: colour});
    polylines.addTo(map);
}

// clear polylines   
function clearPolylines() {
    map.removeLayer(polylines);
}

其中 addPolylines 被多次调用，而 clear Polylines 被调用一次.如何清除地图上的所有折线?

where addPolylines is called multiple times and clear Polylines is called once. How can i clear all polylines on the map?

推荐答案

你必须把它们全部记住，或者稍微作弊，然后窥视 map._layers 以找到它们.

You'll have to remember them all or cheat a bit and peek into map._layers to find them.

编辑 @Ben 添加示例代码:

EDIT adding sample code by @Ben:

function clearMap() {
    for(i in m._layers) {
        if(m._layers[i]._path != undefined) {
            try {
                m.removeLayer(m._layers[i]);
            }
            catch(e) {
                console.log("problem with " + e + m._layers[i]);
            }
        }
    }
}

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