当前支持asp.net最新版本的reCaptcha是1.0.4.0 可以在这里下载.随后在这里申请reCaptha key.
下载后,引用Recaptcha.dll. 然后将如下代码添加到aspx或ascx中:
<%@ Register TagPrefix="recaptcha" Namespace="Recaptcha" Assembly="Recaptcha" %>
UpdatePanel:
aspx code:
<asp:UpdatePanel ID="upComment" runat="server" UpdateMode="conditional"> <ContentTemplate> <asp:TextBox TextMode="MultiLine" runat="server" ID="txtComment" Height="100px" Width="450px" /><br /> <asp:RequiredFieldValidator ID="rvComment" runat="server" ControlToValidate="txtComment" ErrorMessage="Comment field is required!" /> </ContentTemplate> </asp:UpdatePanel> <recaptcha:RecaptchaControl ID="recaptcha" Theme="clear" runat="server" PublicKey="your publicKey" PrivateKey="your privateKey" /> <asp:UpdatePanel ID="upButton" runat="server" UpdateMode="Conditional"> <ContentTemplate> <asp:Label ID="lbtRecaptchError" runat="server" ForeColor="Red" /> <div> <asp:Button ID="btnOk" runat="server" Text=" Ok " OnClick="btnSaveComment_Click" Visible="true" CausesValidation="true" /> <asp:Button ID="btnCancel" runat="server" Text="Cancel" OnClick="btnCancel_Click" CausesValidation="false" Visible="true" /> </div> </ContentTemplate> </asp:UpdatePanel>
CS Code:
protected void btnSaveComment_Click(object sender, EventArgs e) {
if (recaptcha.IsValid) {
//验证通过后在这里可以获得txtComment.Text值.
//..............//然后清空 txtComment.Text = string.Empty;
lbtRecaptchError.Text = string.Empty;
upComment.Update();
}
else {
//验证失败可以获得reCaptcha返回的信息 lbtRecaptchError.Text = recaptcha.ErrorMessage;
//这里将更新reCaptcha的验证码. ScriptManager.RegisterClientScriptBlock(Page,Page.GetType(), "whatever1","Recaptcha.reload();", true);
upButton.Update();
}}
protected void btnCancel_Click(object sender, EventArgs e) {
lbtRecaptchError.Text = string.Empty;
txtComment.Text = string.Empty;
upButton.Update();
upComment.Update();
}
ModalPopup
aspx Code:
<asp:UpdatePanel ID="upMain" runat="server" UpdateMode="Conditional"> <ContentTemplate> <asp:LinkButton ID="lbtLeaveComment" runat="server" Text="Leave your comment" OnClientClick="return Recaptcha.reload();" /> <div id="divComment" runat="server" style="background-color: #ffffff; border-width: 3px; border-style: solid; border-color: Gray; padding: 3px; width: 590px;"> <table> <tr> <td align="right" style="font-weight: bold" valign="top"> Add Comment: </td> <td align="left"> <asp:UpdatePanel ID="upInner" runat="server" UpdateMode="conditional"> <ContentTemplate> <asp:TextBox TextMode="MultiLine" runat="server" ID="txtComment" Height="100px" Width="450px" /><br /><asp:RequiredFieldValidator ID="rvComment" runat="server" ControlToValidate="txtComment" ErrorMessage="Comment field is required!" /> </ContentTemplate> </asp:UpdatePanel> </td> </tr> <tr> <td colspan="2" align="center"> <recaptcha:RecaptchaControl ID="recaptcha" Theme="clear" runat="server" PublicKey="your publicKey" PrivateKey="your privateKey" /> <asp:UpdatePanel ID="upButton" runat="server" UpdateMode="Conditional"> <ContentTemplate> <asp:Label ID="lbtRecaptchError" runat="server" ForeColor="Red" /> <asp:Button ID="btnOk" runat="server" Text=" Ok " OnClick="btnSaveComment_Click" Visible="true" CausesValidation="true" /> <asp:Button ID="btnCancel" runat="server" Text="Cancel" OnClick="btnCancel_Click" CausesValidation="false" Visible="true" /> </ContentTemplate> </asp:UpdatePanel> </td> </tr> </table> </div> <asp:ModalPopupExtender ID="ModalPopupExtender1" runat="server" BackgroundCssClass="modalBackground" PopupControlID="divInner" DropShadow="false" TargetControlID="lbtLeaveComment"> </asp:ModalPopupExtender> </ContentTemplate> </asp:UpdatePanel>
其中 OnClientClick="return Recaptcha.reload();" 是关键.
CS Code:
protected void btnSaveComment_Click(object sender, EventArgs e) {
if (recaptcha.IsValid) {
//省略............. txtComment.Text = string.Empty;
lbtRecaptchError.Text = string.Empty;
Hide();
}
else {
lbtRecaptchError.Text = recaptcha.ErrorMessage;
ScriptManager.RegisterClientScriptBlock(Page,Page.GetType(), "whatever1","Recaptcha.reload();", true);
upButton.Update();
}
}protected void btnCancel_Click(object sender, EventArgs e) {
lbtRecaptchError.Text = string.Empty;
txtComment.Text = string.Empty;
upButton.Update();
Hide();
}private void Hide() {
ModalPopupExtender1.Hide();
upComment.Update();
}
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