我是 js 和 php 新手。我正在使用 codeigniter hmvc。
我有一个 js 文件，它在谷歌地图上显示给定半径的标记，但标记值(纬度和经度)在 js 文件本身的数组中提供。我需要从数据库中获取值并以以下格式存储在js文件中。我尝试寻找答案，但无法将其放入所需的格式。我也不知道如何使用 ajax 和 json。
另外，地理定位部分不起作用，如果有人能告诉我原因和方法-我将不胜感激。提前多谢。 (如果有人将其标记为重复..请在评论中提供链接。)
这是我的代码:
map2.js
var map = null;
var radius_circle;
var markers_on_map = [];
var geocoder;
var infowindow;
//all_locations is just a sample, i need to load these from database in same format
var all_locations = [
{type: "RTO River(eventname)", name: "river 1(eventaddress)", lat: 18.53109147547569, lng: 73.8605202502929},
{type: "KP chowk", name: "square 1", lat: 18.541304420729684, lng: 73.88412368962395},
{type: "Westline chowk", name: "square 2", lat: 18.539208985720602, lng: 73.90377891728508},
{type: "Mawpatta inner circle ", name: "circle 1", lat: 18.51581160734747, lng: 73.92665279576408},
{type: "Phoenix road", name: "road 1", lat: 18.560731744351386, lng: 73.91761911580193}
];
//initialize map on document ready
$(document).ready(function(){
var latlng = new google.maps.LatLng(18.52043, 73.85679);
var myOptions = {
zoom: 1,
center: latlng,
mapTypeControl: true,
mapTypeControlOptions: {style: google.maps.MapTypeControlStyle.DROPDOWN_MENU},
navigationControl: true,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
geocoder = new google.maps.Geocoder();
google.maps.event.addListener(map, 'click', function(){
if(infowindow){
infowindow.setMap(null);
infowindow = null;
}
});
});
function showCloseLocations() {
var i;
var radius_km = $('#radius_km').val();
var address = $('#address').val();
//remove all radii and markers from map before displaying new ones
if (radius_circle) {
radius_circle.setMap(null);
radius_circle = null;
}
for (i = 0; i < markers_on_map.length; i++) {
if (markers_on_map[i]) {
markers_on_map[i].setMap(null);
markers_on_map[i] = null;
}
}
//---------
//----------
if (geocoder) {
geocoder.geocode({'address': address}, function (results, status) {
if (status == google.maps.GeocoderStatus.OK) {
if (status != google.maps.GeocoderStatus.ZERO_RESULTS) {
var address_lat_lng = results[0].geometry.location;
radius_circle = new google.maps.Circle({
center: address_lat_lng,
radius: radius_km * 1000,
clickable: false,
map: map
});
if (radius_circle) map.fitBounds(radius_circle.getBounds());
for (var j = 0; j < all_locations.length; j++) {
(function (location) {
var marker_lat_lng = new google.maps.LatLng(location.lat, location.lng);
var distance_from_location = google.maps.geometry.spherical.computeDistanceBetween(address_lat_lng, marker_lat_lng); //distance in meters between your location and the marker
if (distance_from_location <= radius_km * 1000) {
var new_marker = new google.maps.Marker({
position: marker_lat_lng,
map: map,
title: location.name
});
google.maps.event.addListener(new_marker, 'click', function () {
if(infowindow){
infowindow.setMap(null);
infowindow = null;
}
infowindow = new google.maps.InfoWindow(
{ content: '<div style="color:red">'+location.name +'</div>' + " is " + distance_from_location + " meters from my location",
size: new google.maps.Size(150,50),
pixelOffset: new google.maps.Size(0, -30)
, position: marker_lat_lng, map: map});
});
markers_on_map.push(new_marker);
}
})(all_locations[j]);
}
} else {
alert("No results found while geocoding!");
}
} else {
alert("Geocode was not successful: " + status);
}
});
}
}
mymapview11.php
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script type="text/javascript" src="https://www.google.com/jsapi"></script>
<script type="text/javascript"
src="https://maps.googleapis.com/maps/api/js?key=MYAPIKEY">
</script>
<script type="text/javascript"
src="<?php echo base_url().'js/map2.js'; ?>">
</script>
<script>
// get current location with HTML5 geolocation API.
//not working
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(function(position) {
var pos = {
lat: position.coords.latitude,
lng: position.coords.longitude
};
lat.value = position.coords.latitude ;
lng.value = position.coords.longitude;
info.nodeValue = position.coords.longitude;
// set the current position to the map and create info window with (Here Is Your Location) sentense
infoWindow.setPosition(pos);
infoWindow.setContent('Here Is Your Location.');
// set this info window in the center of the map
map.setCenter(pos);
// draw circle on the map with parameters
DrowCircle(mapOptions, map, pos, km);
}, function() {
// if user block the geolocation API and denied detect his location
handleLocationError(true, infoWindow, map.getCenter());
});
} else {
// Browser doesn't support Geolocation
handleLocationError(false, infoWindow, map.getCenter());
}
</script>
<script>
$.get("<?php echo base_url().'mapme/map11b.php'; ?>", function(data) {
alert("Data Loaded: " + data);
});
</script>
<script>
// get current location with HTML5 geolocation API.
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(function(position) {
var pos = {
lat: position.coords.latitude,
lng: position.coords.longitude
};
lat.value = position.coords.latitude ;
lng.value = position.coords.longitude;
info.nodeValue = position.coords.longitude;
// set the current position to the map and create info window with (Here Is Your Location) sentense
infoWindow.setPosition(pos);
infoWindow.setContent('Here Is Your Location.');
// set this info window in the center of the map
map.setCenter(pos);
// draw circle on the map with parameters
//DrowCircle(mapOptions, map, pos, km);
}, function() {
// if user block the geolocation API and denied detect his location
handleLocationError(true, infoWindow, map.getCenter());
});
} else {
// Browser doesn't support Geolocation
handleLocationError(false, infoWindow, map.getCenter());
}
</script>
</head>
<body style="margin:0px; padding:0px;">
<input id="address" value="Pune" placeholder="Input Address"/>
<select id="radius_km">
<option value=1>1km</option>
<option value=2>2km</option>
<option value=5>5km</option>
<option value=10>10km</option>
<option value=15>15km</option>
<option value=20>20km</option>
<option value=30>30km</option>
<option value=50>50km</option>
</select>
<button onClick="showCloseLocations()" id="showlocationbtn">Show Locations In Radius</button>
<script>
</script>
<div id="map_canvas" style="width:500px; height:300px;"></div>
</body>
</html>
mdl_map.php
<?php
if (!defined(BASEPATH))
exit(No direct script access allowed);
class Mdl_map extends CI_Model
{
function getlocation()
{
$this->db->select('*');
$this->db->from('eventstable');
$this->db->order_by('eventstart','ASC');
$this->db->where('eventpermission =',1);
$this->db->where('eventstatus =',1);
$query = $this->db->get();
return $query->result();
}
}
最佳答案
如果我理解正确的话，您希望知道如何触发 AJAX 请求以从服务器获取数据，并使其在 map2.js 中可用
遵循使用 jQuery 进行 AJAX 调用的语法:
$.ajax({
url: 'http://yourdomain/controller/method/getparamsifany',
type: 'POST', // POST/GET Request Method
data: {key: value, key2: value2}, // An object with data that you want to pass
success: function (response) {
// Response callback
// Code to be executed after receiving the response from AJAX
}
});
所以现在在您的代码中，您将执行以下操作:
var map = null;
var radius_circle;
var markers_on_map = [];
var all_locations = [];
var geocoder;
var infowindow;
$.ajax({
url: 'request url to a method to fetch required data', // Make sure you return the result after json_encode($your_db_result)
type: 'GET',
data: paramsObj,
success: function (response) {
// I am assuming your required data is in response as data
all_locations = response.data;
// Initialize and render your map after this otherwise you might have to render the map again because of the changes in all_locations array.
}
});
如果我误解了您的问题，请对此答案发表评论。
关于javascript - 在php中从数据库中获取值并将其存储在js文件中的数组中，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/44795079/