Question

使用jquery设置asp：hiddenfield的值。但是当我在.aspx.cs页面中访问hiddenfield的值时，它会显示空字符串。

HTML

<asp:HiddenField runat="server" ID="hdnLat"/>
<asp:HiddenField runat="server" ID="hdnLng" />

JS

  <script type="text/javascript">
    function codeAddress() {
        var address = $(".Hno").val() + " " + $(".Address").val() + "," + $(".City").val();  // Fetch Lattitude and logtittude for Using Google Map
        //alert(address);
        var geocoder = new google.maps.Geocoder();
        geocoder.geocode({ 'address': address }, function (results, status) {
            var location = results[0].geometry.location;
            //alert('LAT: ' + location.lat() + ' LANG: ' + location.lng());
            var Lat = $('#<% =hdnLat.ClientID %>').attr('value', location.lat());
            var lng = $('#<% =hdnLng.ClientID %>').attr('value', location.lng());
            //alert($('#<% =hdnLat.ClientID %>').val() + ","+$('#<% =hdnLng.ClientID %>').val());

        });
    }
</script

这是我的按钮，我在调用jquery函数。

<asp:Button ID="btnUpdate" runat="server" CssClass="btn" Text="Submit" CausesValidation="True" ValidationGroup="Register2" OnClientClick="return codeAddress();"></asp:Button>

我在页面呈现时创建了btnUpdate_Click事件。

 private void InitializeComponent()
    {
        this.dlInvQueAnsV.ItemDataBound += new System.Web.UI.WebControls.DataListItemEventHandler(this.dlInvQueAnsV_ItemDataBound);
        this.dlInvQueAnsE.ItemDataBound += new System.Web.UI.WebControls.DataListItemEventHandler(this.dlInvQueAnsE_ItemDataBound);
        this.dgInvQue.ItemDataBound += new System.Web.UI.WebControls.DataGridItemEventHandler(this.dgInvQue_ItemDataBound);
        this.btnBack.Click += new System.EventHandler(this.btnBack_Click);
        this.btnUpdate.Click += new System.EventHandler(this.btnUpdate_Click);
        this.btnRegister.Click += new System.EventHandler(this.btnRegister_Click);
        this.lbCloseAccount.Click += new System.EventHandler(this.lbCloseAccount_Click);
        this.Load += new System.EventHandler(this.Page_Load);
        this.ddlAdminComment.SelectedIndexChanged += new System.EventHandler(this.ddlAdminComment_SelectedIndexChanged);
        this.btnSaveNote.Click += new System.EventHandler(btnSaveNote_Click);
        this.btnSendCommentSMS.Click += new System.EventHandler(btnSendCommentSMS_Click);
        this.btnSendCommentEmail.Click += new System.EventHandler(btnSendCommentEmail_Click);
    }

Answer 1

要设置隐藏字段的值，请不要使用attr()函数，只需使用val()：

$(document).ready(function () {
    $('input[id$=hdnLat]').val(location.lat()); // Take the input where id ends with hdnLat
    $('input[id$=hdnLng]').val(location.lng()); // Take the input where id ends with hdnLng
});

<强> ASP.NET

<asp:Button runat="server" ID="btnUpdate" Text="Maps" OnClick="btnUpdate_Click" />

C＃代码背后：

protected void btnUpdate_Click(object sender, EventArgs e)
{
    string lat = this.hdnLat.Value;
    string lng = this.hdnLng.Value;
}

JS功能

<script type="text/javascript">
    function codeAddress() {

        // other code

        return true;
    }
</script

Answer 2

要在 C# 端访问 hiddenfield 的值，只需使用

    string lat = Request.Form["hdnLat"];
    string lng = Request.Form["hdnLng"];

如何在C＃中访问隐藏字段值？我正在使用jquery设置隐藏字段的值

2 个答案: