jquery - How to make synchronous call to google direction api for requesting the services on serverside? -


how json google directions api using jquery?

i need make requests "eithel" has mentioned in above link because making multiple requests , need responses , need continue. if use requests services clientside, there delays 1 next response , asynchronous, time responses, next set of codes have been executed , don't want happen. if use requests services serverside through ajax, can make synchronous , workout. "geocode" "distancematrix", getting error "no 'access-control-allow-origin' header present on requested resource. origin 'null' therefore not allowed access". there workaround, please me this.

i trying find distance between addresses , put them in matrix, 2 ways, 1 "requests services clientside"

window.finddistance = function(){ var distance = 0; var matrixlength = address.length; distancearray = new array(matrixlength); (var = 0; < matrixlength; i++)  {     distancearray[i] = new array(matrixlength); }  (var i=0;i<address.length;i++) {     (var j=0;j<address.length;j++)     {         if(i==j)         {             distancearray[i][j] = 0;         }         else         {             var directionsservice = new google.maps.directionsservice();             var request = {                     origin:address[i],                     destination:address[j],                     travelmode: google.maps.directionstravelmode.driving                     };             directionsservice.route(request, function(response, status)             {                 if (status == google.maps.directionsstatus.ok)                 {                     distance = response.routes[0].legs[0].distance.text;                     distancearray[x][y] = distance;                 }             });          }     } } }

the above code not synchronous, j incremented , gone second iteration before distance. how can use callback here next iteration should happen after getting distance?

the second way is, "requests services serverside"

window.finddistance = function(){ var distance = 0; var matrixlength = address.length; distancearray = new array(matrixlength); (var = 0; < matrixlength; i++)  {     distancearray[i] = new array(matrixlength); } (var i=0;i<address.length;i++) {     (var j=0;j<address.length;j++)     {         if(i==j)         {             distancearray[i][j] = 0;         }         else         {             var origin = address[i].replace(/ /g,"+");             var destination = address[j].replace(/ /g,"+");             var distanceurl = "https://maps.googleapis.com/maps/api/distancematrix/json?origins="+origin+"&destinations="+destination+"";              $.ajax({             type: "get",             async: false,             url: distanceurl,             success: function(data) {                 var locjson=new array();                         locjson=eval(data);                 distance = locjson.response.routes[0].legs[0].distance.text;                 }                });             distancearray[i][j] = distance;         }     } } }

i don't mind making synchronous async:false giving me error, "no 'access-control-allow-origin' header present on requested resource. origin 'null' therefore not allowed access". how can implement jsonp or cors or server-side proxy?

i new these words.

firstly, never use async: false. synchronous requests block ui updating until request completes, terrible user. looks browser has frozen period , reason why considered incredibly bad practice.

instead, assuming requests must executed in specific order, chain them next request occurs in callback of previous one.

secondly, regarding error 1 of requests:

for "distancematrix", getting error "no 'access-control-allow-origin' header present on requested resource. origin 'null' therefore not allowed access"

this means request domain being blocked same origin policy. if receiving server supports should use jsonp or cors. if not, need use server-side proxy make request.


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