将PHP变量传递给Google Maps API [英] Passing PHP variables to the Google Maps API

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本文介绍了将PHP变量传递给Google Maps API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

当用户注册我的应用程序(大学项目)时,他们会被要求提供他们的地址。我将此地址转换为经度和纬度,然后将其存储在我的数据库中。



我可以这样访问经纬度:

 < ?php 
需要'../connect.php';
session_start();
$ _SESSION ['username'];

$ sql =选择纬度,经度FROM userinformation WHERE username ='。 $ _SESSION [用户名。 ;
$ result = $ db-> query($ sql);

if($ result-> num_rows> 0){
while($ row = $ result-> fetch_assoc()){
$ lat = $ row [ 纬度];
$ lng = $ row [longitude];
echo $ lat;
echo $ lng;

}
}
?>

然后,我尝试将$ lat和$ lng变量传递到Maps API脚本中,如下所示:

 函数initMap(){
var map = new google.maps.Map(document.getElementById('map') ,{
zoom:13,
center:{lat:'<?php echo $ lat;?>',lng:'<?php echo $ lng;?>'}
});

marker = new google.maps.Marker({
map:map,
draggable:true,
animation:google.maps.Animation.DROP,
position:{lat:'<?php echo $ lat;?>',lng:'<?php echo $ lng;?>'}
});
marker.addListener('click',toggleBounce);
}

这给了我以下页面:





I也尝试将PHP变量转换为JS:

  var js_variable ='<?php echo $ lat;?>' ; 
document.write(js_variable);
var js_variable1 ='<?php echo $ lng;?>';
document.write(js_variable1);

然后传入JS变量而不是PHP变量,但输出仍然相同。

  center:{lat:59.325 ,lng:18.070} 
位置:{lat:59.327,lng:18.067}


解决方案

当我用小提琴替换字符串 {lat:'30 .365273',lng:'-81.699600'} ,我得到一个由API报告的javascript错误: Assertion failed:InvalidValueError:setPosition:不是LatLng或LatLngLiteral:属性lat:不是数字



如果我使用 parseFloat $ b

代码片段:



 函数initMap(){var map = new google.maps.Map(document.getElementById('map'),{ zoom:13,center:{lat:parseFloat('30 .365273'),lng:parseFloat(' -  81.699600')}}); marker = new google.maps.Marker({map:map,draggable:true,animation:google.maps.Animation.DROP,position:{lat:parseFloat('30 .365273'),lng:parseFloat(' -  81.699600')} }); marker.addListener('click',toggleBounce);} google.maps.event.addDomListener(window,load,initMap);  

  html,body,#map {height:100%;宽度:100%; margin:0px; < script src =https://   

$ c $函数initMap(){
var map = new google.maps.Map(document.getElementById('map'),{
zoom:13,
center:{lat:parseFloat ('<?php echo $ lat;?>'),lng:parseFloat('<?php echo $ lng;?>')}
});

marker = new google.maps.Marker({
map:map,
draggable:true,
animation:google.maps.Animation.DROP,
position:{lat:parseFloat('<?php echo $ lat;?>'),lng:parseFloat('<?php echo $ lng;?>')}
});
marker.addListener('click',toggleBounce);
}


When a user signs up to my application (college project), they are asked for their address. I convert this address to latitude and longitude and then store it in my database.

I access the latitude and longitude like so:

<?php
    require '../connect.php';
    session_start();
    $_SESSION['username'];

    $sql = "SELECT latitude, longitude FROM userinformation WHERE username = '". $_SESSION['username']. "'";
$result = $db->query($sql);

    if($result->num_rows > 0){
        while($row = $result->fetch_assoc()){
            $lat = $row["latitude"];
            $lng = $row["longitude"];
            echo $lat;
            echo $lng;

        }
    }
?>

I then try to pass the $lat and $lng variable into the Maps API script like so:

function initMap() {
  var map = new google.maps.Map(document.getElementById('map'), {
    zoom: 13,
    center: {lat: '<?php echo $lat;?>', lng: '<?php echo $lng;?>'}
  });

  marker = new google.maps.Marker({
    map: map,
    draggable: true,
    animation: google.maps.Animation.DROP,
    position: {lat: '<?php echo $lat;?>', lng: '<?php echo $lng;?>'}
  });
  marker.addListener('click', toggleBounce);
}

This gives me the following page:

I have also tried converted the PHP variables to JS:

var js_variable  = '<?php echo $lat;?>';
document.write(js_variable);
var js_variable1  = '<?php echo $lng;?>';
document.write(js_variable1);

I then pass in the JS variables instead of the PHP variables, however the output is still the same. What would be the correct way to pass a variable as lat/lng instead of a hardcoded value:

center: {lat: 59.325, lng: 18.070}
position: {lat: 59.327, lng: 18.067}

解决方案

When I replace the values in the fiddle with strings {lat: '30.365273', lng: '-81.699600'}, I get a javascript error reported by the API: Assertion failed: InvalidValueError: setPosition: not a LatLng or LatLngLiteral: in property lat: not a number.

If I use parseFloat on those strings, it works:

code snippet:

function initMap() {
  var map = new google.maps.Map(document.getElementById('map'), {
    zoom: 13,
    center: {
      lat: parseFloat('30.365273'),
      lng: parseFloat('-81.699600')
    }
  });

  marker = new google.maps.Marker({
    map: map,
    draggable: true,
    animation: google.maps.Animation.DROP,
    position: {
      lat: parseFloat('30.365273'),
      lng: parseFloat('-81.699600')
    }
  });
  marker.addListener('click', toggleBounce);
}
google.maps.event.addDomListener(window, "load", initMap);

html,
body,
#map {
  height: 100%;
  width: 100%;
  margin: 0px;
  padding: 0px
}

<script src="https://maps.googleapis.com/maps/api/js"></script>
<div id="map"></div>

change your PHP to be:

function initMap() {
  var map = new google.maps.Map(document.getElementById('map'), {
    zoom: 13,
    center: {lat: parseFloat('<?php echo $lat;?>'), lng: parseFloat('<?php echo $lng;?>')}
  });

  marker = new google.maps.Marker({
    map: map,
    draggable: true,
    animation: google.maps.Animation.DROP,
    position: {lat: parseFloat('<?php echo $lat;?>'), lng: parseFloat('<?php echo $lng;?>')}
  });
  marker.addListener('click', toggleBounce);
}

这篇关于将PHP变量传递给Google Maps API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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