Question

我正在尝试找出一种启动google distancematrix调用的方法，我需要在使用javascript和jquery继续执行程序之前返回结果。请有人帮忙代码样本的想法。我有多条腿用于距离。即：腿1开始和结束点腿2开始和结束点第3节开始和结束点我想要做的是计算不同腿之间的旅行时间，所以腿1完成驾驶员需要开始腿2.所以打电话以获得腿1完成和腿2之间的距离开始。然后继续下一个计算。我已经有腿距了，我的代码如下：

                var driving = 0;
            calculateDistances();

           code to work with the calculatedistances() result here


    function calculateDistances() {
 //alert(origin+','+destination);
 var service = new google.maps.DistanceMatrixService();
 service.getDistanceMatrix(
 {
  //set origin and destination points
  origins: [origin],//, origin2],
  destinations: [destination],          
  travelMode: google.maps.TravelMode.DRIVING,
  unitSystem: google.maps.UnitSystem.METRIC,
  avoidHighways: false,
  avoidTolls: false
  }, callback);
}

function callback(response, status) {
  if (status != google.maps.DistanceMatrixStatus.OK) {
     alert('Error was: ' + status);
  } else {
   var origins = response.originAddresses;
   var destinations = response.destinationAddresses;
   var outputDiv = '';
   for (var i = 0; i < origins.length; i++) {
     var results = response.rows[i].elements;
     //addMarker(origins[i], false);
     for (var j = 0; j < results.length; j++) {
        driving = parseFloat(results[j].distance.text); // driving is a script wide variable to hold the return value
     }
    }
}

}

Answer 1

将回调传递给calculateDistances（）函数，您可以通过传递回调并在方法结束时使用callback（）执行回调。为清晰起见，将您的功能称为其他功

var driving = 0;
calculateDistances(callbackFunction);

function calculateDistances(callback) {

 var service = new google.maps.DistanceMatrixService();
 service.getDistanceMatrix(
 {
  //set origin and destination points
  origins: [origin],//, origin2],
  destinations: [destination],          
  travelMode: google.maps.TravelMode.DRIVING,
  unitSystem: google.maps.UnitSystem.METRIC,


avoidHighways: false,
  avoidTolls: false
  }, callback());
}

function callbackFunction(response, status) {
  if (status != google.maps.DistanceMatrixStatus.OK) {
}
//etc
}

我怎么能等待谷歌远程通话才能在继续之前返回我的结果

1 个答案: