javascript - 使用 css/javascript 更改图例背景颜色

Question

我是 css/javascript 新手!如果这是一个简单的问题，我深表歉意。我正在尝试向 map 添加图例，但我不知道如何将图例背景设为白色。现在，图例是透明的。

这是我在 css 中的内容

#legend {font-family: Arial, sans-serif;
   background: #fff;
    padding: 10px;
    margin: 10px;
    border: 3px solid #000;

然后对于js

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

    legend.onAdd = function (mymap) {

        var div = L.DomUtil.create('div', 'legend'),
        grades = ["Library", "Parking Lot"],
        labels = ["http://maps.google.com/mapfiles/ms/micons/rangerstation.png", "http://maps.google.com/mapfiles/ms/micons/parkinglot.png"];

// loop through our density intervals and generate a label with a colored square for each interval
for (var i = 0; i < grades.length; i++) {
        div.innerHTML +=
    (" <img src="+ labels[i] +" height='50' width='50'>") + grades[i] + '<br>';
}
return div; } legend.addTo(mymap);

编辑: This is what the map looks like right now with the legend

Answer 1

我不完全确定我是否理解您发布的代码，但是，您使用 var div = L.DomUtil.create('div', 'legend') 创建了一个新元素，命名为div，对吧，您想给它添加背景吗？如果是这样，请尝试执行以下操作:

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

    legend.onAdd = function (mymap) {

        var div = L.DomUtil.create('div', 'legend'),
        grades = ["Library", "Parking Lot"],
        labels = ["http://maps.google.com/mapfiles/ms/micons/rangerstation.png", "http://maps.google.com/mapfiles/ms/micons/parkinglot.png"];

        // Add the ID to the div element that will match #legend
        div.id = "legend";

// loop through our density intervals and generate a label with a colored square for each interval
for (var i = 0; i < grades.length; i++) {
        div.innerHTML +=
    (" <img src="+ labels[i] +" height='50' width='50'>") + grades[i] + '<br>';
}
return div; } legend.addTo(mymap);

因此，尝试将 legend id 添加到您拥有的函数内的 div 元素。如果我误解了你的问题并且这不起作用，请联系我更改我的答案。