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Google Maps API Infowindow在提交前将lat和lng值输入表单隐藏字段

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我试图将 'lat''lng' 值输入到信息窗口中嵌入的表单隐藏字段中 . 提交表单后,表单将调用一个函数,在发布之前将 'lat''lng' 值附加到隐藏字段中 .

但是,在尝试将 'lat''lng' 的值传递到隐藏字段时,我遇到了问题 .

//declare global variables
var map = null; 
var info_window = new google.maps.InfoWindow();

// handles the initial settings and styling for google maps 
function initialize() {
      var map_options = {
        zoom: 11,
        center: new google.maps.LatLng(1.35208, 103.81984),
        panControl: false,
        panControlOptions: {
        position: google.maps.ControlPosition.BOTTOM_LEFT
        },

        zoomControl: true,
        zoomControlOptions: {
        style: google.maps.ZoomControlStyle.LARGE,
        position: google.maps.ControlPosition.RIGHT_CENTER
        },
        scaleControl: false
      }

     map = new google.maps.Map(document.getElementById('map-canvas'), map_options); 
     //add marker to the event where the point of the map is clicked
     google.maps.event.addListener(map, 'click', function(event) { add_marker(event.latLng); });
} 


function add_marker(location) {
    map.markers = []; 
    //ensure that the map is initialized
    if(map != null) { 
        var marker = new google.maps.Marker({ 
        position: location, 
        map: map, 
        animation: google.maps.Animation.DROP });

        //listener on markers to listen for clicks/right clicks 
        google.maps.event.addListener(marker, 'rightclick', function(event) { marker.setMap(null); });
        google.maps.event.addListener(marker, 'click', function() { open_info(marker, location) });
        map.markers.push(marker); 
    }
}

function open_info(marker, location) {
    if(map != null) {
        //infowindow form that calls appendLatLng() before submit
        var content =   '<form method="post" action="main.php" onsubmit="return appendLatLng(location)" name="infoWindow" id="infoWindow">' +
                        '<input type="text" name="location" id="location" placeholder= "Location"/>
' + '<input type="textarea" name="description" id="description" cols="40" rows="5" placeholder="Description"/><hr />' + '<input type="hidden" name="lat" id="lat" value=""/>' + '<input type="hidden" name="lng" id="lng" value=""/>' + '<input type="submit" name="save" id="save" value="Save" />' + '</form>'; info_window.setContent(content); info_window.open(map, marker); } } //append location.lat() and location.lng() to lat and lng fields function appendLatLng(location){ document.getElementById('lat').value = location.lat(); document.getElementById('lng').value = location.lng(); } google.maps.event.addDomListener(window, 'load', initialize);

以下是main.php中的php代码段,它试图访问lat和lng值,但我得到的是null值 .

<?php
        if (!empty($_POST['location']) && !empty($_POST['description'])){
    ?>
        <h5><b>Name of Location:</b> <?=$_POST['location']?>
        <b>Description:</b> <?=$_POST['description']?> 
        <b>Longtitude:</b> <?=$_POST['lng']?>
        <b>Latitude:</b> <?=$_POST['lat']?></h5>    
    <?php
        }
    ?>

我想知道我是否在调用appendLatLng()函数时传递“location”对象的问题 . 谁能帮我这个?

非常感谢! :)

2 回答

  • 0

    onsubmit-handler不知道 location -variable,它不会在 open_info() 的范围内执行(在onsubmit-handler location 中将是一个DOMNode,输入ID为"location")

    准备表单时直接设置所需的值:

    var content =   '<form method="post" action="main.php" name="infoWindow" id="infoWindow">' +
                    '<input type="text" name="location" id="location" placeholder= "Location"/>
    ' + '<input type="textarea" name="description" id="description" cols="40" rows="5" placeholder="Description"/><hr />' + '<input type="hidden" name="lat" id="lat" value="'+marker.getPosition().lat()+'"/>' + '<input type="hidden" name="lng" id="lng" value="'+marker.getPosition().lng()+'"/>' + '<input type="submit" name="save" id="save" value="Save" />' + '</form>';
  • 1

    info_window.open(map, marker); 之后插入 appendLatLng(location); . 出于测试目的,将输入id lat和lng设置为文本,您可以看到单击标记时添加的值 .

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