javascript - Google Map API Marker 在 Ruby On Rails 中添加动态标签

Question

我想在 map 上显示多个传感器位置，我需要在标记上显示所有当前传感器值(不是在信息窗口上，用户无需单击标记即可看到数据)

创建许多不同的图标并更改图标对我来说是不现实的。 有没有办法在标记上显示动态数据？假设在标记顶部显示一个数字标签。我找到了一个，但无法将其转换为 ruby​​ on Rails 代码。 这是我找到的链接 java 。 这是 link对于在 ROR 上创建 gmap 非常有用

这就是我现在所拥有的。使用 gem Gmaps4rails。

在app/asssts/gmaptest.js.coffee中

class CustomMarkerBuilder extends Gmaps.Google.Builders.Marker
create_marker: ->
options = _.extend @marker_options(), @rich_marker_options()
@serviceObject = new RichMarker options

rich_marker_options: ->
marker = document.createElement("div")
marker.setAttribute('class', 'custom_marker_content')
marker.innerHTML = this.args.custom_marker
{ content: marker }

create_infowindow: ->
return null unless _.isString @args.custom_infowindow

boxText = document.createElement("div")
boxText.setAttribute("class", 'custom_infowindow_content')
boxText.innerHTML = @args.custom_infowindow
@infowindow = new InfoBox(@infobox(boxText))

infobox: (boxText)->
content: boxText
pixelOffset: new google.maps.Size(-140, 0)
boxStyle:
  width: "280px"
@buildMap=(markers)->
handler = Gmaps.build("Google", builders: { Marker: CustomMarkerBuilder } )
handler.buildMap { internal: id: "custom_builder" }, ->
marker = handler.addMarker
lat:               40.689167
lng:               -74.044444
custom_marker:     "<img src='images/star.jpg' width='30' height='30'> Some text here"
custom_infowindow: "<img src='images/statue.jpg' width='90' height='140'> some test here"

handler.map.centerOn marker
handler.getMap().setZoom(15)
@hash = Gmaps4rails.build_markers(@noiseDevices) do |noiseDevice, marker|
marker.lat noiseDevice.latitude
marker.lng noiseDevice.longitude
end

在app/controller/gmaptest_controller.rb中

@noiseDevices = NoiseDevice.all
@hash = Gmaps4rails.build_markers(@noiseDevices) do |noiseDevice, marker|
marker.lat noiseDevice.latitude
marker.lng noiseDevice.longitude
marker.json({custom_marker: "hi all"})
end

在app/view/gmaptest/index.html.erb

<script src="//maps.google.com/maps/api/js?v=3.13&amp;sensor=false&amp;libraries=geometry" type="text/javascript"></script>
<script src='//google-maps-utility-library-v3.googlecode.com/svn/tags/markerclustererplus/2.0.14/src/markerclusterer_packed.js' type='text/javascript'></script>
<script src='//google-maps-utility-library-v3.googlecode.com/svn/trunk/richmarker/src/richmarker-compiled.js' type='text/javascript'></script>

<h1>Listing gmaptests</h1>

<table>
  <tr>
    <th>Latitude</th>
    <th>Longitude</th>
    <th>Address</th>
    <th>Description</th>
    <th>Title</th>
    <th></th>
    <th></th>
    <th></th>
  </tr>

<% @noiseDevices.each do |noiseDevice| %>
  <tr>
    <td><%= noiseDevice.latitude %></td>
    <td><%= noiseDevice.longitude %></td>




  </tr>
<% end %>
</table>

<br />

<%= link_to 'New gmaptest', new_g1test_path %>
<div style='width: 800px;'>
<div id="custom_builder" style='width: 800px; height: 400px;'></div>
 </div>
<div style='width: 800px;'>
  <div id="map" style='width: 800px; height: 400px;'></div>
</div>


<script type="text/javascript">

handler = Gmaps.build('Google');
handler.buildMap({ provider: {}, internal: {id: 'map'}}, function(){
markers = handler.addMarkers(<%=raw @hash.to_json %>);
handler.bounds.extendWith(markers);
handler.fitMapToBounds();
});
</script>

现在的问题是，当我尝试按照视频/教程并编辑 View 中的文件时，整个谷歌地图窗口消失。原因之一是添加 buildMap(<%=raw@hash.to_json%>) 和其他将脚本更改为 <script type="text/javascript"><br/> var handler = Gmaps.build("Google", builders: { Marker: CustomMarkerBuilder } ) handler.buildMap({ internal: id: "map" }, function(){ var markers = handler.addMarkers(<%=raw @hash.to_json %>); }); </script>

Answer 1

第 1 步:

创建一个咖啡文件，将其命名为gmaps4rails_builder.coffee:

class @CustomMarkerBuilder extends Gmaps.Google.Builders.Marker
  create_marker: ->
    options = _.extend @marker_options(), @rich_marker_options()
    @serviceObject = new RichMarker options

  rich_marker_options: ->
    marker = document.createElement("div")
    marker.setAttribute('class', 'custom_marker_content')
    marker.innerHTML = this.args.custom_marker
    { content: marker }

第二步:

在您看来:

<script src='//google-maps-utility-library-v3.googlecode.com/svn/trunk/richmarker/src/richmarker-compiled.js' type='text/javascript'></script>

<script type="text/javascript">  
  var handler = Gmaps.build("Google", builders: { Marker: CustomMarkerBuilder } )
  handler.buildMap({ internal: id: "map" }, function(){
    var markers = handler.addMarkers(<%=raw @hash.to_json %>);
  });
</script>

第三步:

在你的 Controller 中:

@hash = Gmaps4rails.build_markers(@noiseDevices) do |noiseDevice, marker|
  marker.lat noiseDevice.latitude
  marker.lng noiseDevice.longitude
  marker.json({
    custom_marker: "marker html here"
  })
end