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如何将所需的验证器添加到ajax AsyncFileUpload？

发布于 2024-09-04 20:05:45 字数 57 浏览 4 评论 0原文

如何将客户端所需的验证器添加到 asyncfileupload ，以强制用户在提交页面之前选择文件。

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迷路的信 2024-09-11 20:05:45

您还可以使用 C# 或 VB（而不是客户端 Javascript 或 JQuery 函数）在服务器端方法中设置隐藏文本框的文本。

    protected void afu_UploadedComplete(object sender, AjaxControlToolkit.AsyncFileUploadEventArgs e)
    {
        afu.SaveAs(Server.MapPath("Uploads\\") + e.FileName);

        txt.Text = e.FileName;       
    }

You could also set the text of a the hidden textbox in a server side method using C# or VB, rather than a client side Javascript or JQuery function.

    protected void afu_UploadedComplete(object sender, AjaxControlToolkit.AsyncFileUploadEventArgs e)
    {
        afu.SaveAs(Server.MapPath("Uploads\\") + e.FileName);

        txt.Text = e.FileName;       
    }

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放赐 2024-09-11 20:05:45

我使用RequiredFieldValidator 来验证不可见的文本框。 TextBox 在 OnClientUploadComplete 函数中填充任意文本。
您唯一不能做的就是在验证焦点时设置焦点。
该示例使用 jQuery。

<ajaxToolkit:AsyncFileUpload runat="server" ID="afu" ClientIDMode="AutoID" UploaderStyle="Traditional" OnClientUploadComplete="asyncUploadComplete" OnClientUploadStarted="asyncUploadStarted" />
<asp:RequiredFieldValidator runat="server" ID="rfv" ControlToValidate="txt" Text="The file is required!" SetFocusOnError="false" />
<asp:TextBox runat="server" ID="txt" style="display:none" MaxLength="0" />
<script type="text/javascript">
    // AsyncFileUpload - OnClientUploadComplete
    function asyncUploadComplete(sender, args) {
        // Assemble info of uploaded file
        var contentType = args.get_contentType();
        var info = args.get_length() + " bytes";
        if (contentType.length > 0) {
            info += " - " + contentType;
        }
        info += " - " + args.get_fileName();
        // Put info in the first input field after the AsyncFileUpload control
        var source = $(sender.get_element());
        source.nextAll('input').val(info);
        // Validate immediately
        ValidatorEnable(source.nextAll('span')[0], true);
    }
    // AsyncFileUpload - OnClientUploadStarted
    function asyncUploadStarted(sender, args) {
        // Clear the first input field after the AsyncFileUpload control
        var source = $(sender.get_element());
        source.nextAll('input').val('');
    }
</script>

I use a RequiredFieldValidator that validates an invisible TextBox. The TextBox is filled with an arbitrary text in the OnClientUploadComplete function.
The only thing you cannot is setting the focus when it is validated.
The example uses jQuery.

<ajaxToolkit:AsyncFileUpload runat="server" ID="afu" ClientIDMode="AutoID" UploaderStyle="Traditional" OnClientUploadComplete="asyncUploadComplete" OnClientUploadStarted="asyncUploadStarted" />
<asp:RequiredFieldValidator runat="server" ID="rfv" ControlToValidate="txt" Text="The file is required!" SetFocusOnError="false" />
<asp:TextBox runat="server" ID="txt" style="display:none" MaxLength="0" />
<script type="text/javascript">
    // AsyncFileUpload - OnClientUploadComplete
    function asyncUploadComplete(sender, args) {
        // Assemble info of uploaded file
        var contentType = args.get_contentType();
        var info = args.get_length() + " bytes";
        if (contentType.length > 0) {
            info += " - " + contentType;
        }
        info += " - " + args.get_fileName();
        // Put info in the first input field after the AsyncFileUpload control
        var source = $(sender.get_element());
        source.nextAll('input').val(info);
        // Validate immediately
        ValidatorEnable(source.nextAll('span')[0], true);
    }
    // AsyncFileUpload - OnClientUploadStarted
    function asyncUploadStarted(sender, args) {
        // Clear the first input field after the AsyncFileUpload control
        var source = $(sender.get_element());
        source.nextAll('input').val('');
    }
</script>

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