My current project involves a page with a table that is bound with Knockout inside an UpdatePanel. The main objective is to ensure that the binding is successfully applied after a postback. Initially, everything works fine on the first load of the page, indicating that the model functions correctly.
To achieve this, I utilize the pageLoad() function to call another function that retrieves the JSON data of the model from a HiddenField which was set server-side. Each RadioButton in the view has its click data-bind attribute set to a JavaScript function outside the ViewModel. This function sets a hidden input field's value to the specified ID by the button and triggers a server-side postback by simulating a click on a hidden button client-side.
Within the pageLoad() function, I use Sys.WebForms.PageRequestManager.getInstance().add_endRequest to specify that the binding helper function should be executed after the server-side of the postback is complete.
However, I am encountering some issues:
Even after being updated server-side, the HiddenField containing the JSON data still retains the same string as before when it reaches the client, despite showing the correct update when inspected during the server-side execution. This inconsistency puzzles me.
Furthermore, even though BindingHelper() is called, clicking on the RadioButtons no longer triggers the event after one postback cycle has occurred. This unexpected behavior adds to the confusion.
I would appreciate any insights or suggestions to help resolve these problems!
Here is a snippet of the code for reference:
<!-- Code snippet omitted for brevity -->Upon further investigation, I have discovered that the issue seems to be related to the presence of the UpdatePanel. When registering BindingHelper() as a startup script directly in Page_Load without the UpdatePanel, the functionality works as expected.
Strangely, even when specifying the UpdatePanel in the startup script registration, the results remain unchanged. As there are other controls within the UpdatePanel confirming that it is updating properly, this discrepancy persists without any conditional updates being triggered.