I am experiencing an issue with FreeTextBox where a Javascript error is causing problems with the Post

I encountered an issue on my webpage where I have three FreeTextBox controls. Everything was working fine until I added a DropDownList control that needed to PostBack to the server. Surprisingly, the OnSelectedIndexChanged event did not trigger when using the DropDownList control. Instead, I kept getting a Javascript error like this:

TypeError: FTB_API.MainContent_MainContent_FreeTextBox1 is undefined

The error seemed straightforward and pointed to a function called WebForm_OnSubmit(). Even after trying various solutions, the issue persisted. It only worked when I removed the FreeTextBox controls from the page. Any assistance would be highly appreciated.

EDIT 1: Here is some of the markup from my page:

3 FreeTextBox controls set up in this manner:

<FTB:FreeTextBox ID="FreeTextBox3" JavaScriptLocation="ExternalFile" ButtonImagesLocation="ExternalFile" ToolbarImagesLocation="ExternalFile" runat="server" EnableHtmlMode="true" />

My DropDownList control:

<asp:DropDownList ID="DropDownList1" runat="server" AppendDataBoundItems="true" AutoPostBack="true" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged"></asp:DropDownList>
c#javascriptasp.netpostbackfreetextbox

Answer №1

To ensure your dropdown menu triggers a post back when the element is changed, you must set the AutoPostBack property to true in the markup page. This will then activate the OnSelectedIndexChanged event.

For example:

<asp:DropDownList id="drpList" runat="server" AutoPostBack="true" OnSelectedIndexChanged="event name" />

Answer №2

In my search for a solution to the issue discussed in this post, I stumbled upon the resolution here: Uncovering a Hidden FreeTextBox bug on Firefox. Interestingly, it appears that when the control is concealed or not visible (in my case, within tabs), it triggers this unexpected behavior. The fix I found may be considered somewhat of a workaround, but it does indeed resolve the problem. Appreciate the insights provided.

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