删除背景地图传单

Question

我正在使用 Leaflet 制作欧洲的 cloropleth 地图。我想删除地图，以便只有 cloropleth 图层可见（背景白色）。

我尝试使用不同版本的 map.removeLayer，但我无法在不删除所有图层的情况下进行更改。

我也尝试过更改 css 中的 .leaflet-container。

关于如何移除背景地图并将彩色图层保留在国家/地区上的任何想法？

<script type="text/javascript" src="europe_countries.js"></script>

<script type="text/javascript">

    var map = L.map('map').setView([50.888571, 10.413779], 3);



    L.tileLayer('https://api.tiles.mapbox.com/v4/{id}/{z}/{x}/{y}.png?access_token=pk.eyJ1IjoibWFwYm94IiwiYSI6ImNpejY4NXVycTA2emYycXBndHRqcmZ3N3gifQ.rJcFIG214AriISLbB6B5aw', {
        maxZoom: 18,
        attribution: 'Map data &copy; <a href="https://www.openstreetmap.org/">OpenStreetMap</a> contributors, ' +
            '<a href="https://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>, ' +
            'Imagery © <a href="https://www.mapbox.com/">Mapbox</a>',
        id: 'mapbox.light'
    }).addTo(map);


    // control that shows state info on hover
    var info = L.control();

    info.onAdd = function (map) {
        this._div = L.DomUtil.create('div', 'info');
        this.update();
        return this._div;
    };

    info.update = function (props) {
        this._div.innerHTML = '<h4>US Population Density</h4>' +  (props ?
            '<b>' + props.name + '</b><br />' + props.density + ' people / mi<sup>2</sup>'
            : 'Hover over a state');
    };

    info.addTo(map);


    // get color depending on population density value
    function getColor(d) {
        return d > 1000 ? '#800026' :
                d > 500  ? '#BD0026' :
                d > 200  ? '#E31A1C' :
                d > 100  ? '#FC4E2A' :
                d > 50   ? '#FD8D3C' :
                d > 20   ? '#FEB24C' :
                d > 10   ? '#FED976' :
                            '#FFEDA0';
    }

    function style(feature) {
        return {
            weight: 2,
            opacity: 1,
            color: 'white',
            dashArray: '3',
            fillOpacity: 0.7,
            fillColor: getColor(feature.properties.density)
        };
    }

    function highlightFeature(e) {
        var layer = e.target;

        layer.setStyle({
            weight: 2,
            color: '#666',
            dashArray: '',
            fillOpacity: 0.7
        });

        if (!L.Browser.ie && !L.Browser.opera && !L.Browser.edge) {
            layer.bringToFront();
        }

        info.update(layer.feature.properties);
    }

    var geojson;

    function resetHighlight(e) {
        geojson.resetStyle(e.target);
        info.update();
    }

    function zoomToFeature(e) {
        map.fitBounds(e.target.getBounds());
    }

    function onEachFeature(feature, layer) {
        layer.on({
            mouseover: highlightFeature,
            mouseout: resetHighlight,
            click: zoomToFeature
        });
    }

    geojson = L.geoJson(statesData, {
        style: style,
        onEachFeature: onEachFeature
    }).addTo(map);

    map.attributionControl.addAttribution('Population data &copy; <a href="http://census.gov/">US Census Bureau</a>');


    var legend = L.control({position: 'bottomright'});

    legend.onAdd = function (map) {

        var div = L.DomUtil.create('div', 'info legend'),
            grades = [0, 10, 20, 50, 100, 200, 500, 1000],
            labels = [],
            from, to;

        for (var i = 0; i < grades.length; i++) {
            from = grades[i];
            to = grades[i + 1];

            labels.push(
                '<i style="background:' + getColor(from + 1) + '"></i> ' +
                from + (to ? '&ndash;' + to : '+'));
        }

        div.innerHTML = labels.join('<br>');
        return div;
    };

    legend.addTo(map);

  function drawMap(tile){
    map.eachLayer(function (layer) {
        map.removeLayer(layer);
    });
    map.addLayer(tile);
}

</script>

CSS：

<style>
        html, body {
            height: 100%;
            margin: 0;
        }
        #map {
            width: 600px;
            height: 400px;
        }


    </style>

    <style>#map { width: 800px; height: 500px;}
.info { padding: 6px 8px; font: 14px/16px Arial, Helvetica, sans-serif; background: white; background: white; box-shadow: 0 0 15px rgba(0,0,0,0.2); border-radius: 5px; } .info h4 { margin: 0 0 5px; color: #777; }
.legend { text-align: left; line-height: 18px; color: #555; } .legend i { width: 18px; height: 18px; float: left; margin-right: 8px; opacity: 0.7; }

</style>

Answer 1

如果我理解的问题是正确的，使用你在 cmets 中添加的例子，我相信你可以hide.leaflet-tile-container?

.leaflet-tile-container {
    display: none;
}