服务器更改了HiddenField javascript值，请在客户端进行确认

Question

Is there a way to check on client side that the HiddenField has been update from server?

Updating 2 images every 5 second by client side:

 __doPostBack('UpdatePanel', '');

Server side:

 HiddenField1_Foto.Value = Foto(random)

Client side:

image.src = document.getElementById('<%= HiddenField1_Foto.ClientID %>').value;

A lot of time a new image doesnt show up like hasnot been load yet,but the server did update document.getElementById('<%= HiddenField1_Foto.ClientID %>').value;

How to check that the images has been load?

Answer 1

image.onload = function（）{}-完成了工作