谷歌地图、Ruby on Rails、带一个标记的缩放级别 [英] Google Maps, Ruby on Rails, Zoom level with one marker

问题描述

我正在通过 apneadiving/Google-Maps-for-Rails 添加谷歌地图支持(感谢很棒的 gem)

I am adding google maps support with apneadiving / Google-Maps-for-Rails (thanks awesome gem)

然而，我发现了一个小故障，这很可能是我的错.

I am finding one slight glitch, however, which very likely is my fault.

auto_zoom 在有多个标记时效果很好.但是，当只有一个标记时，它会放大到最大级别，这并不漂亮.

auto_zoom works great when there are multiple markers. However, when there is only one marker it is zoomed in to the max level which is not pretty.

"zoom" 仅在 auto_zoom 为 false 时有效，所以这不是我想要的.

"zoom" will only work when auto_zoom is false, so that's not what I want.

因此，您可以使用maxZoom"，但现在用户无法手动放大超过该点，这不是我想要的.

So therefore you could use "maxZoom" but now users cannot zoom in manually beyond that point which is not what I want.

有没有办法解决这个问题?我的解释有意义吗?这是 Google Maps API 的限制吗?

Is there a way around this? Is my explanation making sense? Is this a limitation of Google Maps API?

谢谢...

推荐答案

这种行为是由于 auto_zoom 谷歌地图 API 中的内置函数造成的.

This behavior is due to the auto_zoom built-in function in the google maps api.

一种解决方法是在 gmaps 方法中将其设置为 false:

One work around to this is to set it to false in the gmaps method:

<%= gmaps({
       "map_options" => { "auto_zoom" => false},
       "markers"     => { "data" => @json }
      })
%>

然后使用 gmaps4rails_callback 来满足您的需求(确保至少有 0.7.9 版本)

And then use the gmaps4rails_callback to fit your needs (be sure to have at least version 0.7.9)

<script type="text/javascript" charset="utf-8">
  function gmaps4rails_callback() {
    if (Gmaps4Rails.markers.length == 1) {
     //only one marker, choose the zoom level you expect
     Gmaps4Rails.map.setZoom(2);
    }
    else{
     //more than one marker, let's auto_zoom
     Gmaps4Rails.map_options.auto_zoom = true;
     Gmaps4Rails.adjust_map_to_bounds();
    }
  }
</script>

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