VS 2012 AJAX - Updating IFrame Correctly
Jan 24, 2014
I have a page with an updatepanel, which at runtime has controls dynamically created. The controls are saved within the cache, and readded to the page upon postback each time when needed. Sometimes the controls need to change, sometimes not. In most of my cases, if I just re-add the control to the page without any changes to the control AJAX will leave the control alone on the client-side leaving me with what I expect to see, which is no change. If I make a change, it obviously updates correctly.
Now, I have added a literal control which defines an iFrame which points to another page. ie:
Code:
.LiteralControl.Text = "<iframe name='" & .LiteralControl.ID & "' id='" & .LiteralControl.ClientID & "' frameborder='no' scrolling='auto' height='" & _
.ItemHeight & "px' width='" & .ItemWidth & "px' src='" & "WBRender.aspx?ViewID=" & strUniqueID.ToString & "' style='position: absolute; " & _
"left:" & .ItemLeft & "px; top:" & .ItemTop & "px;'></iframe>"
If I re-add this control on postback, with a change, I get the item on the page as I expect. If I make no changes to the .Text and simply re-add the control to the page, it flashes as though it has been changed and then re-requests the page defined by the src. The whole point of me caching this, is to stop the client-side from updating a control that has not changed, removing a flashing screen and all the resizing that goes with it.
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