ruby-on-rails - 在谷歌地图上动态显示标记-Rails 3.2

Question

我有一个工作代码，它使用 geocoder 在谷歌地图上显示多个标记，例如 @nearbys = Place.near("#{params[:address]}", 5,:order => "distance",:units => :km) @nearbys.first(5) 我使用下面的代码显示标记

function initialize() {
    var map;
    var bounds = new google.maps.LatLngBounds();
    var mapOptions = {
        mapTypeId: 'roadmap'
    };

    // Display a map on the page
    map = new google.maps.Map(document.getElementById("map-canvas-guest"), mapOptions);
    map.setTilt(45);

    // adding Multiple Markers from ruby object
    var markers = [
        ['<%= @nearbys[0].title %>', '<%= @nearbys[0].latitude %>','<%= @nearbys[0].longitude %>'],
        ['<%= @nearbys[1].title %>', '<%= @nearbys[1].latitude %>','<%= @nearbys[1].longitude %>'],
        ['<%= @nearbys[2].title %>', '<%= @nearbys[2].latitude %>','<%= @nearbys[2].longitude %>'],
        ['<%= @nearbys[3].title %>', '<%= @nearbys[3].latitude %>','<%= @nearbys[3].longitude %>']
        ,
        ['<%= @nearbys[4].title %>', '<%= @nearbys[4].latitude %>','<%= @nearbys[4].longitude %>']
      ];

    // adding Info Window Content 
    var infoWindowContent = [
        ['<div class="info_content" >' +
        '<h3><%= @nearbys[0].title %></h3>' +'</br>'+
        '<p><%= @nearbys[0].about %></p>' +       
         '</div>'],
        ['<div class="info_content">' +
        '<h3><%= @nearbys[1].title %></h3>' +
        '<p><%= @nearbys[1].about %></p>' +
        '</div>'],
                ['<div class="info_content">' +
        '<h3><%= @nearbys[2].title %></h3>' +'</br>'+
        '<p><%= @nearbys[2].about %></p>' +
        '</div>'],
                ['<div class="info_content">' +
        '<h3><%= @nearbys[3].title %></h3>' +'</br>'+
        '<p><%= @nearbys[2].about %>/p>' +
        '</div>'],
                ['<div class="info_content">' +
        '<h3><%= @nearbys[4].title %></h3>' +'</br>'+
        '<p><%= @nearbys[4].about %></p>' +
        '</div>']
    ];

    // Display multiple markers on a map
    var infoWindow = new google.maps.InfoWindow(), marker, i;

    // Loop through our array of markers & place each one on the map  
    for( i = 0; i < markers.length; i++ ) {
        var position = new google.maps.LatLng(markers[i][1], markers[i][2]);
        bounds.extend(position);
        marker = new google.maps.Marker({
            position: position,
            map: map,
            title: markers[i][0]
        });

        // Allow each marker to have an info window    
        google.maps.event.addListener(marker, 'click', (function(marker, i) {
            return function() {
                infoWindow.setContent(infoWindowContent[i][0]);
                infoWindow.open(map, marker);


            }
        })(marker, i));

        // Automatically center the map fitting all markers on the screen
        map.fitBounds(bounds);

    }

    // Override our map zoom level once our fitBounds function runs (Make sure it only runs once)
    var boundsListener = google.maps.event.addListener((map), 'bounds_changed', function(event) {
        this.setZoom(14);
        google.maps.event.removeListener(boundsListener);
    });

}//initialize ends

但问题是:- 如果@nearbys 的计数少于 5，那么这段代码会失败。所以我一直在尝试使用 jquery 数组使其动态化，但它不起作用，因为我认为我的代码缺少一些可以工作的东西它是动态的。 它应该是这样的..

var array=<%= @nearbys%>;
var markers=[];
var infowindows=[];
array.each(function(index){
markers.push('<%= @nearbys[0].title %>', '<%= @nearbys[0].latitude %>','<%= @nearbys[0].longitude %>');
infowindows.push('<div class="info_content" >'+'<h3><%= @nearbys[0].title %></h3>' +'</br>'+
        '<p><%= @nearbys[0].about %></p>'+'</div>');

})

..那么我如何才能实现这个........使这个动态化，这样上面的工作代码就不会随着新添加的代码而中断。

Answer 1

在与 jquery arrays 和 json 斗争之后，我找到了这个最好的解决方案......这在所有情况下都有效，我需要的只是处理空条件和空条件，我已经做到了并且它按照我需要的方式工作。希望这对某人有帮助

我的 Controller

def show_nearby_locations

  @nearbys = Place.near("#{params[:address]}", 5,:order => "distance",:units => :km)
  @nearbys.first(10)

end

在我的 View 文件中

<%= javascript_tag do%>
 window.nearbys= <%=raw @nearbys.to_json %>;

<%end%>

这是我在 View 中的脚本

function initialize() {
    var map;
    var bounds = new google.maps.LatLngBounds();
    var mapOptions = {
        mapTypeId: 'roadmap'
    };

    // Display a map on the page
    map = new google.maps.Map(document.getElementById("map-canvas-guest"), mapOptions);
    map.setTilt(45);            

    var markers=[];
    var infoWindowContent=[];
    $.each(nearbys, function(index) { 

        console.log( data[0][index].latitude,data[0][index].longitude );
        markers.push([nearbys[index]['title'], nearbys[index]['latitude'],nearbys[index]['longitude']]);
        infoWindowContent.push(['<div class="info_content" >' +
        '<h3 style="color: rgb(<%= rand(0..200)%>,<%= rand(0..200)%> ,<%= rand(0..200)%>);">'+nearbys[index]['title']+'</h3>' +'</br>'+
        '<p>'+nearbys[index]['about']+'</p>' +       
         '</div>']);

        });   

       // Display multiple markers on a map
       var infoWindow = new google.maps.InfoWindow(), marker, i;        
      // Loop through our array of markers & place each one on the map  
      for( i = 0; i < markers.length; i++ ) {
          var position = new google.maps.LatLng(markers[i][1], markers[i][2]);
          bounds.extend(position);
          marker = new google.maps.Marker({
            position: position,
            map: map,
            title: markers[i][0]
        });

        // Allow each marker to have an info window    
        google.maps.event.addListener(marker, 'click', (function(marker, i) {
            return function() {
                infoWindow.setContent(infoWindowContent[i][0]);
                infoWindow.open(map, marker);


            }
        })(marker, i));

        // Automatically center the map fitting all markers on the screen
        map.fitBounds(bounds);

    }

    // Override our map zoom level once our fitBounds function runs (Make sure it only runs once)
    var boundsListener = google.maps.event.addListener((map), 'bounds_changed', function(event) {
        this.setZoom(14);
        google.maps.event.removeListener(boundsListener);
    });

}//initialize ends