2016-06-25 05:26
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I am loading live map using json file but when i login the page some time it loads the json file from server n show the live map location. But sometime it not load the json file it takes the data from catche file n because of catche file i unable to show the live location. Please help me what to do

Thanks in advance

This is the code

$(document).ready(function() {     


  $.getJSON('json/<?php echo $vehicle_imei_no2;?>.json').done(function(json){  

     var lat_lng = new Array();
     var path = new google.maps.MVCArray();
     var poly = new google.maps.Polyline({ map: map, strokeColor: '#0000ff' });
     service = new google.maps.DirectionsService();
     directionsDisplay = new google.maps.DirectionsRenderer();

       $.each(json, function(key, data) {
          latLng = new google.maps.LatLng(data.lat, data.lng); 
            if(data.date == '<?php echo $currentDate;?>'){
              if(data.time >= '<?php echo $sessionTime; ?>'){

        addMarker(latLng, map); //add new marker
             }); //each

             for (var i = 1; i < lat_lng.length; i++) {

                    var src = lat_lng[i];
                   var des = lat_lng[i + 1];
                       origin: src,
                       destination: des,
                       travelMode: google.maps.DirectionsTravelMode.DRIVING
                   }, function (result, status) {
                       if (status == google.maps.DirectionsStatus.OK) {


            });    //getjson

   }, 1000);//interval 

 function addMarker(location,map) {

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4条回答 默认 最新

  • doulan4371 2016-06-25 05:59

    You can globally disable cache using this

    $(document).ready(function() {
      $.ajaxSetup({ cache: false });

    or use $.ajax({}) to load the json file and set cache to false

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  • doupu1727 2016-06-25 05:31

    While fetching the file regardless of what kind of method you are using use an old trick. Add to the file name a changing query string for example:


    Where CURRENT_TIMESTAMP is generated timestamp. For the browser it will be always a new file, but not for the server. So the browser won't use caching here.

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  • dtx63505 2016-06-25 05:33

    Please provide more information to your question, such as where the JSON is being requested from, the code used to request the JSON and similar..

    Anyway, a neat trick with fetching resources is to append a random query to the request with javascript or even from a server side rendering process..


    is not the same as:


    and should make a new request since that data has never been cached.

    An example using jQuery (stated in comments):

    $.getJSON('/data/map.json?' + (new Date().getTime()), ...)

    using the Date will also ensure you never request the same random number.

    I'd suggest you try to fix the issue on the server side of things..

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  • duanchi0883649 2016-06-29 11:02

    i use both combination

    $(document).ready(function() {
      $.ajaxSetup({ cache: false });
    $.getJSON('json/<?php echo $vehicle_imei_no1;?>.json?' + (new Date().getTime())).done(function(json){ });

    and this works for me

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