How to update location on map and move the marker to the updated location

Question

0.00/5 (No votes)

See more:

I am able to create and display map with location(lat,long) data from database.
"setInterval" used but the map and marker is not changing.
I need to track GPS device with updated lat,long from the database.
upon new data(lat,long) read from the database, the marker should animate to the new location.
objective of the code is to show the realtime position of GPS device on the map.

I am putting my present code below..

please help me,anybody.

Thanks.

What I have tried:

var map;
           var marker;

           function LoadMap()
           {
                <?php include 'latlongmap.php';?>
                SetMap(fetchedlatlong);
           }


           function SetMap(latlong)
           {
              map = L.map('map').setView(latlong, 12);

              mapLink = 'OpenStreetMap';
              L.tileLayer(
           'http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
           attribution: 'Map data © ' + mapLink,
           maxZoom: 18,
           }).addTo(map);
               marker = L.marker(latlong).addTo(map);
               layer.bindPopup('LatLng: ' + layer.getLatLng()).openPopup();
           }



           setInterval(LoadMap,5000);

Posted 12-Feb-19 21:38pm

ramen79

Updated 14-Feb-19 3:47am

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Richard Deeming · Answer 1 · 2019-02-14T03:47:00

Solution 1

Quote:

function LoadMap()
{
    <?php include 'latlongmap.php';?>
    SetMap(fetchedlatlong);
}

That code will render the output of the latlongmap.php file ONCE, when the page is first requested. That output will not change until you reload the page.

If you want to load data from the server without reloading the page, then you need to make an AJAX request.
Getting Started - Developer guides | MDN[^]
fetch documentation[^]

Posted 14-Feb-19 3:47am

Richard Deeming

Comments

ramen79 24-Feb-19 15:33pm

Thanks Richard for your reply.
I have tried with ajax, it is polling latlon from mysql every 5 secs as i set(I have checked with alert), but no luck yet ,the map layer/marker position not getting updated..

Below is the code I have tried...

function fetchdata(){
$.ajax({
url: 'getLatLong.php',
type: 'post',
dataType: 'json',
success: function(response){
// Perform operation on the return value
// alert(response);
var latlon = response
//alert(latlon)
//setMap(latlon)
var myMap = setTimeout(setMap,3000)
function setMap(){
var map = new L.map('map' , {center: latlon,
zoom: 14})
// Creating a Layer object
var layer = new L.TileLayer('http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png')
// Adding layer to the map
map.addLayer(layer)
var marker = L.marker(latlon).addTo(map)
layer.bindPopup('LatLng: ' + layer.getLatLng()).openPopup()
}

},
complete:function(data){
setTimeout(fetchdata,5000);
}
});
}

$(document).ready(function(){
setInterval(fetchdata,5000);