简单的方法来获取Leaflet LayerGroup的大小? [英] Easy way to get size of Leaflet LayerGroup?

问题描述

是否有一种简单的方法来获取传单LayerGroup 中的层数?快速浏览文档说明目前没有.

Is there a straightforward way to get the number of layers in a Leaflet LayerGroup? A quick glance at the documentation says there isn't at the moment.

推荐答案

自从我的第一个答案以来，LayerGroup已通过getLayers()方法进行了扩展，使解决方案变得简单易懂:layerGroup.getLayers().length.

Since my first answer, the LayerGroup has been extended with a getLayers() method, making the solution straightforward: layerGroup.getLayers().length.

旧冗余答案:

查看 LayerGroup代码，您应该能够通过layerGroup._layers.length获取层数.

Looking at the LayerGroup code, you should be able to get the number of layers by layerGroup._layers.length.

但是请注意，实现者的_layers意图是私有的，因此我想您不确定这在将来的版本中是否可以使用.

But note that _layers by the implementors is intended to be private, so I guess you cannot be sure this will work in future versions.

如果要保留在公共API中，则可以调用eachLayer并计算层数.

If you want to stay within the public API, then you could call eachLayer and count the layers.

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