我正在使用watchPosition方法连续获取坐标。我在showLocation方法中获得了纬度和经度。现在,我想将所有获取的纬度和经度存储到数据库中,因此我在showLocation方法中编写了db.transcation。现在如何从showLocation方法到populateDB方法获取动态纬度和经度。我想存储每次更改的经度和纬度。

<script type="text/javascript" charset="utf-8">
            document.addEventListener("deviceready", onDeviceReady, false);
            var db = window.openDatabase("GPS", "1.0", "Simple GPS", 500000); //will create database GPS or open it
            function onDeviceReady()
            {
                 var watchID = null;
                 if(navigator.geolocation)
                 {

                     var options = { timeout: 5000, enableHighAccuracy: true };
                     watchID = navigator.geolocation.watchPosition(showLocation, errorHandler, options);
                 }

              }


          function populateDB(tx) {
              tx.executeSql('CREATE TABLE IF NOT EXISTS location (id INTEGER PRIMARY KEY AUTOINCREMENT, latitude TEXT, longitude TEXT, LastModifiedTime CHAR(30))');
               tx.executeSql('INSERT INTO location(latitude,longitude,LastModifiedTime) VALUES ("-----", "------", datetime('now'))');

             }

           function showLocation(position)
             {
                  // Getting Lat/Longs from call back method
                  var latitude = position.coords.latitude;
                  var longitude = position.coords.longitude;
                  // Display coordinates in html / screen..
                  document.getElementById("demo").innerHTML="<p>Latitude : " + latitude + "</p><p> Longitude: " + longitude +"</p>";
                  document.getElementById("messageTxt").innerHTML="Latitude : " + latitude + " Longitude: " + longitude;
                  document.getElementById("MailLatlongs").innerHTML="Latitude : " + latitude + " Longitude: " + longitude;

                  db.transaction(populateDB, errorCB, successCB);
                 }
    </script>

最佳答案

我认为您想在事务回调函数中传递参数。
如果这是您的问题,请参考此链接。

how can I pass argument in transaction callback function

10-08 01:24