asp.net - 如何使用 jQuery 从 ASP.NET 服务器控件传递值？

Question

我用后面的代码更新了代码。我正在使用标签控件做一些动态的事情。

我有以下 jQuery 代码按原样工作(传递“test”的值)，但我想做的是传递标签控件(lblNames)的值。我正在使用标签控件来收集上传的文件名，有办法吗？

jQuery:

$(document).ready(function () {
    $("#btnUpload").click(function () {
        $("#Notes", top.document).val('test');
    });
});

ASPX 代码:

<asp:Label ID="lblNames" runat="server" visible="true" ></asp:Label>

背后代码:

    Protected Sub btnUpload_Click(ByVal sender As Object, ByVal e As System.EventArgs)    Handles btnUpload.Click
    Dim fileExt As String
    fileExt = System.IO.Path.GetExtension(FileUpload1.FileName)

    If (fileExt <> ".exe") Then
        Dim fileNames As New List(Of String)

        Try
            Dim hfc As HttpFileCollection = Request.Files
            lblFiles.Text = String.Empty
            lblNames.Text = String.Empty

            For i As Integer = 0 To hfc.Count - 1
                Dim hpf As HttpPostedFile = hfc(i)
                If hpf.ContentLength > 0 Then
                    fileNames.Add(hpf.FileName)
                    hpf.SaveAs(Server.MapPath("/directory") & "\" & System.IO.Path.GetFileName(hpf.FileName))
                    lblFiles.Text += "<b>File: </b>" & hpf.FileName & "     " & "    Uploaded Successfully! <br />"
                    lblNames.Text += hpf.FileName & ", "
                Else
                    lblWarning.Text = "Please choose a file to upload."
                End If
            Next i
        Catch ex As Exception

        End Try

Answer 1

您可以轻松地将 ID 插入脚本中并以这种方式将其取出:

$(document).ready(function () {
    $("#btnUpload").click(function () {
        $("#Notes", top.document).val( $("#<%= lblNames.ClientID %>").text() );
    });
});