jquery - Asp文件上传控件是否有文件

Question

我有一个这样的文件上传:

<asp:FileUpload id="FileUploadControl" runat="server" />
    <asp:Button runat="server" id="UploadButton" class="btn btn-default disabled" text="Upload" onclick="UploadButton_Click" />
    <br /><br />
    <asp:Label runat="server" id="StatusLabel" text="Upload status: " />

以及背后的代码:

protected void UploadButton_Click(object sender, EventArgs e)
{
    if(FileUploadControl.HasFile)
    {
        try
        {
            string filename = Path.GetFileName(FileUploadControl.FileName);
            FileUploadControl.SaveAs(Server.MapPath("~/") + filename);
            StatusLabel.Text = "Upload status: File uploaded!";
        }
        catch(Exception ex)
        {
            StatusLabel.Text = "Upload status: The file could not be uploaded. The following error occured: " + ex.Message;
        }
    }
}

我想要检查 fileupload 是否有文件并激活我的按钮 UploadButton...将 CSS 类更改为 btn btn-default active。我现在不知道是否可能？

Answer 1

我认为这应该使用 jquery 来更好地完成。尝试这样的事情:

$("#fileinput").change(function() {  
    $("#yourbutton").removeClass("disabled").addClass("active");
});

Here是一个样本。您应该对 id 进行正确的替换。