我一直在为一个朋友开发一个小应用程序，现在我正在编码一个 mysql 查询
<?php
include 'dbconnect.php';
$result = mysql_query("SELECT * FROM coords ORDER BY name DESC") or die ("Could not
query");
while($row = mysql_fetch_array($result)) {
$r[] = array(
"name" => $row['name'],
"lat" => $row['lat'],
"lng" => $row['lng'],
"speed" => $row['speed'],
"altitude" => $row['altitude'],
"distance" => $row['distance']
);
}
$encoded = json_encode($r);
echo$encoded;
mysql_close($conn);
?>
问题是没有与每个条目关联的数组位置键来告诉 json 这整件事是一个键
Array(
[1] = ( "name" => $row['name'],
"lat" => $row['lat'],
"lng" => $row['lng'],
"speed" => $row['speed'],
"altitude" => $row['altitude'],
"distance" => $row['distance']),
[2] = ( "name" => $row['name'],
"lat" => $row['lat'],
"lng" => $row['lng'],
"speed" => $row['speed'],
"altitude" => $row['altitude'],
"distance" => $row['distance'])));
对于数据库中的每一行，基本上我想用他自己的键将数据库的每一行解析成一个数组，这样我就可以将它称为 javascript 对象并在谷歌地图上绘制它。
ive tried
<?php
include 'dbconnect.php';
$count = 0;
$result = mysql_query("SELECT * FROM coords ORDER BY name DESC") or die ("Could not
query");
while($row = mysql_fetch_array($result)) {
$count = $count + 1;
$r[$count] = array(
"name" => $row['name'],
"lat" => $row['lat'],
"lng" => $row['lng'],
"speed" => $row['speed'],
"altitude" => $row['altitude'],
"distance" => $row['distance']
);
}
$encoded = json_encode($r);
echo$encoded;
mysql_close($conn);
?>
但这不起作用，然后是我的 json 代码，我不确定它是否正确。下面是我的地图代码，您可以查看 json 代码部分并告诉我这是否是我应该如何调用我想在我的 php 文件中写入的数组。另外，如果我正在从数组中绘制标记。谢谢
var watchID;
var latitudeAndLongitudeCurrent;
var route = false;
var firstMapCall;
var directionsDisplay; // Declare a variable
of renderer object
var directionsService = new google.maps.DirectionsService(); // Instantiate a
directions service.
var map;
var currentMarker;
var carMarker;
var usermarker;
var markloc;
var myOptions =
{
zoom:14,
mapTypeId: google.maps.MapTypeId.ROADMAP,
enableHighAccuracy: true,
zoomControlOptions: {
position: google.maps.ControlPosition.TOP_RIGHT
},
maximumAge: 10000
};
function initializeMyMap()
{
directionsDisplay = new google.maps.DirectionsRenderer(); // Instantiate a
renderer object.
//directionsDisplay.suppressMarkers = true; //removes direction markers
map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
directionsDisplay.setMap(map); // bind the map to
the renderer
}
function showLocation(){
firstMapCall = true;
//if initalize hasn't been called, call it
if(directionsDisplay == null) {
initializeMyMap();
}
watchID = navigator.geolocation.watchPosition(onSuccessShowLoc, onError, myOptions);
}
function setMapBounds(position){
var mapBounds = new google.maps.LatLngBounds();
mapBounds.extend(position);
map.fitBounds(mapBounds);
zoomChangeBoundsListener =
google.maps.event.addListenerOnce(map, 'bounds_changed', function(event) {
if (this.getZoom()){
this.setZoom(18);
}
});
resize();
}
// onSuccess Geolocation
function onSuccessShowLoc(position) {
latitudeAndLongitudeCurrent = new google.maps.LatLng(position.coords.latitude,
position.coords.longitude);
if(firstMapCall == true){
var result = retrieveLocation();
setMapBounds(latitudeAndLongitudeCurrent);
if(result != null){
addCarMarker(result);
}
firstMapCall = false;
}
deleteOverlays();
addCurrentLocMarker(latitudeAndLongitudeCurrent);
//ajax
var ajaxRequest;
try{
// Opera 8.0+, Firefox, Safari
ajaxRequest = new XMLHttpRequest();
}catch (e){
// Internet Explorer Browsers
try{
ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
}catch (e) {
try{
ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
}catch (e){
// Something went wrong
alert("Your browser broke!");
return false;
}
}
}
// This sets the users location in the database
var lat = position.coords.latitude;
var lng = position.coords.longitude;
var parseid = id;
var queryString = "?lat=" + lat ;
queryString += "&lng=" + lng + "&id=" + parseid;
console.log('string combination');
ajaxRequest.open("GET", "data.php" + queryString, true);
ajaxRequest.send(null);
console.log('executed');
}
// Removes the overlays from the map, but keeps them in the array
function deleteOverlays() {
if (currentMarker) {
currentMarker.setMap(null);
}
}
function deleteCarOverlay() {
if (carMarker) {
carMarker.setMap(null);
}
}
function deleteUserOverlay() {
if (usermarker) {
usermarker.setMap(null);
}
}
function addCurrentLocMarker(location) {
marker = new google.maps.Marker({
position: location,
icon: 'http://www.wolfdoginfo.net/app/snowboarding.png',
map: map
});
currentMarker = marker;
}
function addCarMarker(location) {
marker = new google.maps.Marker({
draggable: true,
raiseOnDrag: false,
icon:'http://www.wolfdoginfo.net/app/revolt.png',
map: map,
position: location
});
carMarker = marker;
}
var myVar=setInterval(function(){showData()},3000);
function showData(str)
{
calluserlocation();
}
function calluserlocation(){
console.log('calluserlocation fires');
$.ajax( {
url: "getdata.php",
type: "GET",
dataType: "json",
success: function(data) { for (var i = 0; i < data.length; i++) { markloc = new
google.maps.LatLng(data[i].b, data[i].c); adddata(markloc); } }, error:
function(data) { console.log( "error with the json" ); } });
console.log("sucessful run of function");
}
function adddata(markloc){
marker = new google.maps.Marker({
position: markloc,
icon: 'http://www.wolfdoginfo.net/app/cropcircles.png',
map: map
});
deleteUserOverlay();
usermarker = marker;
}
function calcRoute()
{
var theDestination = retrieveLocation();
if(theDestination == null){
alert("Error: No Friend meeting place has been saved.");
return null;
}
var request = // Instantiate a DirectionsRequest object
{
//origin is LatLng object
origin: latitudeAndLongitudeCurrent,
//destination is LatLng object
destination: theDestination,
travelMode: google.maps.DirectionsTravelMode.WALKING
};
directionsService.route(request, // call route() to request directions service
function(result, status)
{
if (status == google.maps.DirectionsStatus.OK)
{
directionsDisplay.setOptions({ preserveViewport: true });
directionsDisplay.setDirections(result); // draw the routes
// put text directions on directions_panel
directionsDisplay.setPanel(document.getElementById("directions_panel"));
route=true;
}
}
);
}
function textDirections()
{
if(route == false){
calcRoute();
}
}
function resize(){
var map_page = document.getElementById('show');
var map_container = document.getElementById('the_map_container');
var header = document.getElementById('thehead');
var newHeight = map_page.offsetHeight - 170;
map_container.style.height = newHeight + 'px';
// trigger a resize event on the map so it reflects the new size
if(map != null) {
google.maps.event.trigger(map, 'resize');
}
}