Thank you, Zbouboutchi! This trick solves the issue.

On Tuesday, April 7, 2015 at 10:45:52 AM UTC-7, yongzh...@gmail.com wrote:
>
> Hello all,
>
> I just wonder if there is a way to show a "please wait" image (or animated 
> spinning) in the form page until the post action completed (for example, 
> plot a figure then load it in a new page). I searched here and found the 
> following similar discussion (~three years ago 
> https://groups.google.com/forum/#!searchin/webpy/Show$20image$20during|sort:relevance/webpy/jGAG29QZykU/F9O9Vt-rUVcJ).
>  
> I just wonder if there is a better alternative. Thanks a lot.
>
> Best Regards,
> -Yongzhi
>

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