在asp.net codebehind中访问javascript变量

Question

I need to store the geolocation(lat,long) when on page_load to a db table. 我需要在page_load上将地理位置（lat，long）存储到db表。

For which I use this script. 我使用这个脚本。

<body onload="getLocation()">

    <p>Click the button to get your coordinates.</p>

            <%--<button onclick="getLocation()">Try It</button>--%>

            <p id="demo"></p>


    <form id="form1" runat="server">
        <div>

            <p>
                <asp:HiddenField ID="hdnLocation" ClientIDMode="Static" runat="server" />
 <asp:Label ID="lblloc" runat="server"></asp:Label>
                <asp:TextBox ID="txtloc" runat="server"></asp:TextBox>
                <asp:Button ID="btnLoc" text="submit" runat="server" OnClick="btnLoc_Click" />

            </p>
        </div>
    </form>

        <script>
            var x = document.getElementById("demo");

            function getLocation() {
                if (navigator.geolocation) {
                    navigator.geolocation.getCurrentPosition(showPosition);
                } else {
                    x.innerHTML = "Geolocation is not supported by this browser.";
                }
            }

            function showPosition(position) {
                x.innerHTML = "Latitude: " + position.coords.latitude +
                "<br>Longitude: " + position.coords.longitude;
                $("[id*=hdnLocation]").val(position.coords.latitude + ' ' + position.coords.longitude);
            //    $("[id*=btnLoc]").trigger("click");
            }
            </script>

</body>
</html>

here is my code behind public partial class getLocation : System.Web.UI.Page 这是我公共部分类getLocation背后的代码：System.Web.UI.Page

{ protected void Page_Load(object sender, EventArgs e) { {protected void Page_Load（object sender，EventArgs e）{

    lblloc.Visible = true;

    lblloc.Text = hdnLocation.Value;
    txtloc.Text = hdnLocation.Value;

}

when I run the page I get values in hidden field when I inspect in browser. 当我运行页面时，我在浏览器中检查时会在隐藏字段中获取值。

But can't access the hidden field values in code behind. 但无法访问后面的代码中的隐藏字段值。 Response.Write comes blank and lblloc.text comes null. Response.Write为空，lblloc.text为空。

What could be the problem. 可能是什么问题呢。

Answer 1

In order for your current jQuery selector to work, your HTML element needs to have the ClientIDMode property set to "Static". 为了使您当前的jQuery选择器正常工作，您的HTML元素需要将ClientIDMode属性设置为“Static”。

With server elements in .NET, the server id and the client id are two very different things. 对于.NET中的服务器元素，服务器ID和客户端ID是两个非常不同的东西。 This ensures they are the same for this element. 这可确保它们与此元素相同。

<asp:HiddenField ID="hdnLocation" runat="server" ClientIDMode="Static" />

Answer 2

This should work: 这应该工作：

HTML HTML

<script type="text/javascript">
function abc()
{
  var str="value";
  document.getElementById("Hidden1").value=str;
}


</script>
<body>
    <form id="form1" runat="server">
    <div>
        <input id="Hidden1" type="hidden" runat="server" />
        <asp:Button ID="Button1" runat="server" OnClientClick="abc()"  Text="Button"
            onclick="Button1_Click" />
    </div>
    </form>
</body>

Code behind 代码背后

Response.Write(Hidden1.Value);

在asp.net codebehind中访问javascript变量

问题描述

2 个解决方案

解决方案1
0 2017-04-18 20:03:44

解决方案2
0 2017-04-18 22:13:08

在asp.net codebehind中访问javascript变量

问题描述

2 个解决方案

解决方案1 0 2017-04-18 20:03:44

解决方案2 0 2017-04-18 22:13:08

解决方案1
0 2017-04-18 20:03:44

解决方案2
0 2017-04-18 22:13:08