自动刷新Google地图标记。 [英] Auto Refresh of Google Map markers.

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本文介绍了自动刷新Google地图标记。的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

嘿那里，我正在学习本教程：



https://developers.google.com/kml/articles/phpmysqlkml [ ^ ]



它的工作原理是美化的。我从数据库中读取数据并生成XML文件并将其覆盖在谷歌地图上。



代码与教程完全相同。现在的问题是我自动刷新调用php页面的html页面。 php脚本生成XML文件。我正在使用Meta标头自动刷新html页面。看到整个页面每5秒重新加载一次非常烦人。我需要刷新，因为我正在构建具有动态功能的远程记录器。



我想刷新标记。而不是页面。 html文件代码如下。请紧急帮忙。谢谢



 <  ！DOCTYPE     html    >  
 <   head  >  
 <   meta     name   =  viewport    content   =  initial-scale = 1.0，user-scalable = no    /  >  
 <   meta     http-equiv   =  content-type    content   =  text / html; charset = UTF-8  /  >  
 <   title  >  Drifter <   / title  >  
 
 < span class =code-keyword><   script     type   =  text / javascript    src   =  http： //maps.googleapis.com/maps/api/js?sensor=false\">  <   /   script  & gt;  
 <   script     type   =  text / javascript  >  
  //   <！[CDATA [ 
 
 setTimeout（ function （）{
  window 。 location  .reload（）; 
}， 5000 ）; 
 
 
  var  customIcons = {
 blue：{
 icon：'  http://labs.google.com/ridefinder/images/mm_20_blue.png'，
 shadow：'  http://labs.google.com/ridefinder/images/mm_20_shadow.png' 
}， 
红色：{
图标：'  http://labs.google.com/ridefinder/ images / mm_20_red.png'，
 shadow：'  http://labs.google。 com / ridefinder / images / mm_20_shadow.png' 
} 
}; 
 
 
  function  load（）{
  var  map =  new  google.maps。地图（ document  .getElementById（  map），{
 center： new  google.maps.LatLng（-29。 86519774 ， 30  。 98538962 ），
 zoom： 18 ，
 mapTypeId：'  terrain' 
}）; 
 
 
  var  infoWindow =  new  google.maps.InfoWindow; 
 
  //  根据PHP文件的名称进行更改 
 downloadUrl（  genxml.php， function （数据）{
  var  xml = data.responseXML; 
  var  markers = xml.documentElement.getElementsByTagName（  marker）; 
 
  for （ var  i =  0 ; i < markers.length; i ++）{
 
  var  point =  new  google .maps.LatLng（
  parseFloat （markers [i] .getAttribute（  LA t）），
  parseFloat （markers [i] .getAttribute（  lon）））; 
 
 
  var  icon = customIcons [  blue] || {}; 
  var  marker =  new  google.maps.Marker（{
 map：map ，
 position：point，
 icon：icon.icon，
 shadow：icon.shadow 
}）; 
 
 
 
 
 bindInfoWindow（marker，map，infoWindow）; 
} 
}）; 
} 
 
 
 
  function  bindInfoWindow（marker，map，infoWindow）{
 google .maps.event.addListener（marker，' 点击'， function （）{
 
 infoWindow.open（map，marker）; 
}）; 
} 
 
  function  downloadUrl（url，callback）{
  var  request =  window  .ActiveXObject？ 
  new  ActiveXObject（'  Microsoft.XMLHTTP' ）：
  new  XMLHttpRequest; 
 
 request.onreadystatechange =  function （）{
  if （ request.readyState ==  4 ）{
请求。 önreadystatechange= doNothing; 
回调（request，request.status）; 
} 
}; 
 
 request.open（'  GET'，url，真）; 
 request.send（ null ）; 
} 
 
  function  doNothing（）{} 
 
  //    
 
 <   /   script  >  
 
 < span class =code-keyword><   / head  >  
 
 <   body     onload   =  load（） < span class =code-keyword>>  
 <   div     id   = 地图     style   =  width：1000px;高度：600px >  <   / div  >  
 <   / body  >  
 
 <   / html  >





谢谢

解决方案

试试我正在使用

 setInterval 





<！DOCTYPE html> 
< head> 
< meta name =viewportcontent =initial-scale = 1.0，user- scalable = no/> 
< meta http-equiv =content-typecontent =text / html; charset = UTF-8/> 
< title> Drifter< / title> 
 
< script type =text / javascriptsrc =http：//maps.googleapis .com / maps / api / js？sensor = false>< / script> 
< script type =text / javascript> 
 //<！[CDATA [
 var markers = []; 
 setInterval（function（）{
 DeleteMarkers（）; 
 BindMarker（）; 
}，5000）; 
 
函数DeleteMarkers（）{
 //遍历所有标记并删除
 for（var i = 0; i< markers.length; i ++）{
 markers [i] .setMap （null）; 
} 
 
 
 markers = []; 
}; 
 
 var customIcons = {
 blue： {
 icon：'http：//labs.google.com/ridefinder/images/mm_20_blue.png'，
 shadow：'http：//labs.google.com/ridefinder/images/mm_20_shadow。 png'
}，
红色：{
图标：'http：//labs.google.com/ridefinder/images/mm_20_red.png'，
 shadow：'http：//labs.google.com/ridefinder/images/ mm_20_shadow.png'
} 
}; 
 
 var map = null; 
 var infoWindow = null; 
 function load（）{
 map = new google.maps.Map（document.getElementById（map），{
 center：new google.maps.LatLng（-29.86519774,30.98538962） ，
 zoom：18，
 mapTypeId：'terrain'
}）; 
 
 
 infoWindow = new google.maps.InfoWindow; 
 
 //根据PHP文件的名称进行更改
 BindMarker（）; 
} 
 
函数BindMarker（）{
 downloadUrl（genxml.php，function（data）{
 var xml = data.responseXML; 
 var markers = xml.documentElement.getElementsByTagName（marker）; 
 
 for（var i = 0; i< markers.length; i ++）{
 
 var point = new google.maps.LatLng（
 parseFloat（markers [i] .getAttribute（lat）），
 parseFloat（markers [i] .getAttribute（lon）））; 
 
 
 var icon = customIcons [blue] || {}; 
 var marker = new google.maps.Marker（{
 map：map，
 position ：点，
图标：icon.icon，
 shadow：icon.shadow 
}）; 
 
 markers.push（marker）; 
 
 
 bindInfoWindow（标记，map，infoWindow）; 
} 
}）; 
} 
 
函数bindInfoWindow（marker，map，infoWindow）{
 google.maps.event.addListener（marker，'click'，function（）{
 
 infoWindow.open（map，marker）; 
}）; 
} 
 
函数downloadUrl（url，callback）{
 var request = window.ActiveXObject？ 
 new ActiveXObject（'Microsoft.XMLHTTP'）：
 new XMLHttpRequest; 
 
 request.onreadystatechange = function（）{
 if（request.readyState == 4）{$ b $brequest.önreadystatechange= doNothing; 
回调（request，request.status）; 
} 
}; 
 
 request.open（'GET'，url，true）; 
 request.send（null）; 
} 
 
函数doNothing（）{} 
 
 // 
 
< / script> 
 
< / head> 
 
< body onload =load（）> 
< div id =mapstyle =width：1000px; height：600px>< / div> 
< / body> 
 
< / html>


Hey there, I am following this tutorial:

https://developers.google.com/kml/articles/phpmysqlkml[^]

it works beuatifully. I read in data from the database and generate an XML file and overlay it on google maps.

The code is exactly like the tutorial. the problem now is i am auto-refreshing the html page which calls the php page. the php script generates the XML file. I am using the Meta header to auto refresh the html page. it is extremely annoying to see the entire page reload every 5 seconds. I require a refresh as I am building a remote logger that has dynamic capability.

I would like to just refresh the markers. and not the page. The html file code is below. please help urgently. thanks

<!DOCTYPE html >
  <head>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
    <meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
    <title>Drifter</title>

    <script type="text/javascript" src="http://maps.googleapis.com/maps/api/js?sensor=false"></script>
    <script type="text/javascript">
    //<![CDATA[

    setTimeout(function () {
       window.location.reload();
    }, 5000);


    var customIcons = {
      blue: {
        icon: 'http://labs.google.com/ridefinder/images/mm_20_blue.png',
        shadow: 'http://labs.google.com/ridefinder/images/mm_20_shadow.png'
      },
      red: {
        icon: 'http://labs.google.com/ridefinder/images/mm_20_red.png',
        shadow: 'http://labs.google.com/ridefinder/images/mm_20_shadow.png'
      }
    };


    function load() {
      var map = new google.maps.Map(document.getElementById("map"), {
        center: new google.maps.LatLng(-29.86519774,30.98538962),
        zoom: 18,
        mapTypeId: 'terrain'
      }); 

      
      var infoWindow = new google.maps.InfoWindow;

      // Change this depending on the name of your PHP file
      downloadUrl("genxml.php", function(data) {
        var xml = data.responseXML;
        var markers = xml.documentElement.getElementsByTagName("marker");

        for (var i = 0; i < markers.length; i++) {
          
          var point = new google.maps.LatLng(
              parseFloat(markers[i].getAttribute("lat")),
              parseFloat(markers[i].getAttribute("lon")));
          

          var icon = customIcons["blue"] || {};
          var marker = new google.maps.Marker({
            map: map,
            position: point,
            icon: icon.icon,
            shadow: icon.shadow
          });


          

          bindInfoWindow(marker, map, infoWindow);
        }
      });
    }

 

    function bindInfoWindow(marker, map, infoWindow) {
      google.maps.event.addListener(marker, 'click', function() {
        
        infoWindow.open(map, marker);
      });
    }
     
    function downloadUrl(url, callback) {
      var request = window.ActiveXObject ?
          new ActiveXObject('Microsoft.XMLHTTP') :
          new XMLHttpRequest;

      request.onreadystatechange = function() {
        if (request.readyState == 4) {
          request. önreadystatechange = doNothing;
          callback(request, request.status);
        }
      };

      request.open('GET', url, true);
      request.send(null);
    }

    function doNothing() {}

    //

</script>

  </head>

  <body onload="load()">
    <div id="map" style="width: 1000px; height: 600px"></div>
  </body>

</html>



thanks

解决方案

Try This I am using 

setInterval



<!DOCTYPE html >
  <head>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
    <meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
    <title>Drifter</title>

    <script type="text/javascript" src="http://maps.googleapis.com/maps/api/js?sensor=false"></script>
    <script type="text/javascript">
        //<![CDATA[
        var markers = [];
        setInterval(function () {
            DeleteMarkers();
            BindMarker();
        }, 5000);

        function DeleteMarkers() {
            //Loop through all the markers and remove
            for (var i = 0; i < markers.length; i++) {
                markers[i].setMap(null);
            }


            markers = [];
        };
        
        var customIcons = {
            blue: {
                icon: 'http://labs.google.com/ridefinder/images/mm_20_blue.png',
                shadow: 'http://labs.google.com/ridefinder/images/mm_20_shadow.png'
            },
            red: {
                icon: 'http://labs.google.com/ridefinder/images/mm_20_red.png',
                shadow: 'http://labs.google.com/ridefinder/images/mm_20_shadow.png'
            }
        };

        var map = null;
        var infoWindow = null;
        function load() {
            map = new google.maps.Map(document.getElementById("map"), {
                center: new google.maps.LatLng(-29.86519774, 30.98538962),
                zoom: 18,
                mapTypeId: 'terrain'
            });


            infoWindow = new google.maps.InfoWindow;

            // Change this depending on the name of your PHP file
            BindMarker();
        }

        function BindMarker() {
            downloadUrl("genxml.php", function (data) {
                var xml = data.responseXML;
                var markers = xml.documentElement.getElementsByTagName("marker");

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

                    var point = new google.maps.LatLng(
                        parseFloat(markers[i].getAttribute("lat")),
                        parseFloat(markers[i].getAttribute("lon")));


                    var icon = customIcons["blue"] || {};
                    var marker = new google.maps.Marker({
                        map: map,
                        position: point,
                        icon: icon.icon,
                        shadow: icon.shadow
                    });

                    markers.push(marker);


                    bindInfoWindow(marker, map, infoWindow);
                }
            });
        }

        function bindInfoWindow(marker, map, infoWindow) {
            google.maps.event.addListener(marker, 'click', function () {

                infoWindow.open(map, marker);
            });
        }

        function downloadUrl(url, callback) {
            var request = window.ActiveXObject ?
                new ActiveXObject('Microsoft.XMLHTTP') :
                new XMLHttpRequest;

            request.onreadystatechange = function () {
                if (request.readyState == 4) {
                    request.önreadystatechange = doNothing;
                    callback(request, request.status);
                }
            };

            request.open('GET', url, true);
            request.send(null);
        }

        function doNothing() { }

        //

</script>

  </head>

  <body onload="load()">
    <div id="map" style="width: 1000px; height: 600px"></div>
  </body>

</html>


这篇关于自动刷新Google地图标记。的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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