Question

继昨天的问题之后：

Google Directions Service w/ Waypoints returning ZERO_RESULTS

博士。莫尔说，directions_changed听众会再次开火。他们是对的。它无限地射击。我想知道是否有更好的地方放置这个听众，或者是否有办法限制允许在一段时间内开火的次数。

function route(waypoint) {

distance = 5;   // Default distance

if(waypoint){

    var request = {
        origin: document.getElementById("search-input-from").value,
        destination: document.getElementById("search-input-to").value,
        waypoints: waypoint,
        optimizeWaypoints: true,
        travelMode: google.maps.DirectionsTravelMode.DRIVING
    };
}
else{

    var request = {
        origin: document.getElementById("search-input-from").value,
        destination: document.getElementById("search-input-to").value,
        travelMode: google.maps.DirectionsTravelMode.DRIVING
    };
}

var directionRendererOptions = { draggable: true };

// Make the directions request
directionService.route(request, function(result, status) {
    if (status == google.maps.DirectionsStatus.OK) {

        directionsDisplay.setOptions(directionRendererOptions); 
        directionsDisplay.setDirections(result);
        directionsDisplay.setMap(map);

        var path = result.routes[0].overview_path;

        // more code here that won't matter
    }
    else {
            alert("Directions query failed: " + status);
        }

     //listener for dragged route/polyline

google.maps.event.addListener(directionsDisplay, 'directions_changed', function(){

            var waypoints = directionsDisplay.getDirections().routes[0].legs[0].via_waypoints||[];

            for(var i=0;i<waypoints.length;++i){

               waypoints[i]={stopover:true,location: waypoints[i]}
            }

            route(waypoints);

        });
    });
 }

编辑：应该更好地解释自己。基本上当我试图重绘路线时，我得到了directions_changed的无限循环。

另外，对于任何看过这个问题的人，我真的不认为这是必要的。我没有缺乏研究或努力，文档的航点部分很糟糕，并且没有例子他们尝试通过LatLng对象使用航点。他们只使用了位置。

Answer 1

当你呼叫路线（航路点）时，设置一个标志。当directions_handler函数运行时，清除标志，不要重新渲染方向。

  var directionsRedraw = false;

  google.maps.event.addListener(directionsDisplay, 'directions_changed', function(){
    if (directionsRedraw == false) {
      directionsRedraw = true;
      var waypoints = directionsDisplay.getDirections().routes[0].legs[0].via_waypoints||[];
      for(var i=0;i<waypoints.length;++i){
        waypoints[i]={stopover:true,location: waypoints[i]}
      }
      route(waypoints);
    } else { 
      directionsRedraw = false;
    }
  });

限制听众在一段时间内可以开火的次数？

1 个答案: