在提交前输入lat和lng值到表单隐藏字段

Google Maps API Infowindow Inputing lat and lng Values into Form Hidden Field before Submit

本文关键字：表单 隐藏 字段 lng 提交 输入 lat      更新时间：2023-09-26

我试图将'lat'和'lng'值输入到嵌入在信息窗口内的表单隐藏字段中。在提交表单时，表单将调用一个函数，该函数在提交表单之前将'lat'和'lng'值附加到隐藏字段中。

然而，当试图将'lat'和'lng'的值传递到隐藏字段时，我面临问题。

//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"/><br />' +
                        '<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，试图访问lat和lng值，但我得到空值。

    <?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
        }
    ?>

我想知道如果它是我传递"位置"对象的问题，因为我调用appendLatLng()函数。有人能帮我一下吗?

谢谢!:)

onsubmit-handler不知道location -变量，它将不会在open_info()的范围内执行(在onsubmit-handler中location将是一个DOMNode，输入ID为"location")

在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"/><br />' +
                '<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>';

在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，当您单击标记时，您可以看到添加的值。

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