freetextbox 保存的时候报错 __doPostBack(dotNetName,'Save');

我的页面上只有FTB:FreeTextBox id="FreeTextBox1" 这一个控件，保存的时候总是报错

FTB_FreeTextBox.prototype.SaveButton = function() {
this.StoreHtml();
dotNetName = this.id.split('_').join(':');
__doPostBack(dotNetName,'Save');
};

在官方的网址找到答案 ： http://freetextbox.com/forums/thread/8923.aspx

This error occurs in v3.1.3 as well. It happens because FTB is trying to call a JavaScript method __doPostBack. This method is an ASP.NET method that the framework uses to trigger postback events from controls that do not normally trigger a form submission (e.g., a link button). Unfortuantely, the __doPostBack method is only included in the page if there is a control that .NET knows requires it (e.g., a link button) - FTB is not known to .NET, and so is not considered as requiring the method. The simplest (albeit somewhat silly) workaround is to include a link button (or some other control that forces .NET to include the __doPostBack JavaScript method) on your page. The link button must be visible, but does not have to contain text.

以下是解决方案：

To sum up, the solution to this problem (until it is addressed by the maintainers) is to include a text-less link button somewhere on your page along with the FTB. The follwing is such a link button:

<asp:LinkButton ID="LinkButton1" runat="server"/>

错误原因：

错就错在只有Freetextbox一个控件。

再多添加个控件 就行了（如上）