The art of breathing life into UpdatePanels

Although I have experimented with the UpdatePanelAnimationExtender from the Ajax Control Toolkit, my main issue with it is that it does not wait for the animation to finish before loading new content.

What I aspire to achieve is:

  1. Commence asynchronous request to server
  2. Fade out UpdatePanel's content completely
  3. After UpdatePanel has fully faded out and new content is received, load in the fresh content
  4. Fade in the UpdatePanel

I can insert this code on the trigger initiating the postback:

OnClientClick="Sys.WebForms.PageRequestManager.getInstance().add_pageLoading(PauseForFade); FadeOut();"

In addition, I have the following JavaScript code which will halt any further processing:

function PauseForFade(sender, args) {args.set_cancel(true);}

The challenge I am facing is how to continue the loading process once my fade animation is completed. Any assistance on this matter would be greatly appreciated.

asp.netjavascriptajax

Answer №1

I've come up with a solution that seems to be working effectively. If anyone has a better approach, feel free to share.

Within my button, I have included the following OnClientClick event handler:

OnClientClick="return FadeOut();"

This triggers my FadeOut method, which checks if the current content is faded in and visible before deciding whether or not to cancel the asynchronous postback invoked by the UpdatePanel.

Once the animation completes, I reset the IsFadedIn variable to false and programmatically click the button again (admittedly, this part may need cross-browser compatibility tweaks as it's currently just a proof of concept). With IsFadedIn now false, the FadeOut method allows the UpdatePanel to initiate the postback.

I've implemented an event handler for the pageLoaded Event to smoothly fade in new content once it finishes loading.

Pros: Animations can finish before loading new content.

Cons: Users may experience a slight delay as they wait for the animation to complete before the postback begins.

var opacity = 100;
var IsFadedIn = true;

Sys.WebForms.PageRequestManager.getInstance().add_pageLoaded(FadeIn);
function FadeIn(sender, args) {
  if (!IsFadedIn) {
    if (opacity < 100) {
      opacity += 15;
      $get("LowerPageContent").style.filter = "alpha(opacity=" + opacity + ")";
      setTimeout(FadeIn, 1);  
    } else {
      $get("LowerPageContent").style.filter = "alpha(opacity=100)";
      IsFadedIn = true;
    }
  }
}

function FadeOut() {
  if (IsFadedIn) {
    if (opacity > 0) {
      opacity -= 15;
      $get("LowerPageContent").style.filter = "alpha(opacity=" + opacity + ")";
      setTimeout(FadeOut, 1);
    } else {
      $get("LowerPageContent").style.filter = "alpha(opacity=0)";
      IsFadedIn = false;
      $get("TestButton").click();
    }
    return false;
  }
}

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