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javascript - 谷歌地图地理编码 - offsetWidth

转载 作者:行者123 更新时间:2023-12-02 16:35:32 25 4
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我在使用 Google map API 显示邮政编码时遇到问题。但是,它给出了一个错误:

https://maps.gstatic.com/maps-api-v3/api/js/19/6/main.js 中的行 ...、列 ... 出现未处理的异常

0x800a138f - JavaScript 运行时错误:无法获取未定义或 null 引用的属性“offsetWidth”

您能给我一些指导吗?

代码文件:

    public string location = string.Empty;

protected void Page_Load(object sender, EventArgs e)
{
using (OleDbConnection conn = new OleDbConnection())
{
String connection = System.Configuration.ConfigurationManager.ConnectionStrings["google_string"].ConnectionString;

conn.ConnectionString = connection;
conn.Open();

String sql = "select * from tbl_Post";
OleDbCommand cmd = new OleDbCommand(sql,conn);
var rdr = cmd.ExecuteReader();
rdr.Read();

if(!string.IsNullOrEmpty(rdr["location"].ToString()))
{

location = rdr["location"].ToString();
}

}
}
}

}

asp 文件:

    <div>
<%--map canvas--%>
<style type="text/css">
html, body, #map-canvas {
height: 100%;
margin: 0;
padding: 0;
}
</style>


<script type="text/javascript"
src="https://maps.googleapis.com/maps/api/js?key=....">

</script>

<script type="text/javascript">
var geocoder;
var map;

function initialize() {
geocoder = new google.maps.Geocoder();

var latlng;
var mapOptions = {
//street level

center: new google.maps.LatLng(-34.397, 150.644),
zoom: 18,

}


map = new google.maps.Map(document.getElementById("map-canvas"), mapOptions);

//load post code address (CALLING FUNCTION)
codeAddress();
}


google.maps.event.addDomListener(window, "load", initialize);

function codeAddress() {


geocoder.geocode({ 'address': '<%= location%>' }, function (results, status) {
if (status == google.maps.GeocoderStatus.OK) {
map.setCenter(results[0].geometry.location);

var marker = new google.maps.Marker({
map: map,
position: results[0].geometry.location
});
} else {
alert("Geocode was not succesfull for the following reason" + status);
}
});
}
</script>

</div>

最佳答案

此问题通常是由于在需要访问 map divjavascript 运行之前未呈现该 map 。

您似乎已经快到了,因为您没有带有 id="map-canvas" 的元素。因此,给你的 div 一个 id,然后它应该按预期工作。

<div id="map-canvas"></div>

关于javascript - 谷歌地图地理编码 - offsetWidth,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/27967322/

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