As we know some actions can take long time to return back the response, in this case the user may do not know what happens at this time, so we need to show or display some indicators that reflect these delays or executions to the user. To get start we need to know some JavaScript . Inside the target page add popup component and design your own style as you need, I prefer use animated image to reflect the real functionality of loader. Now you need to add the following script inside your page using <af:resources> tag, this script will open the popup by id, the yellow color in the images show that. Inside the page add command button to execute your action, this button contains <af:clientListener> component to invoke function in the JavaScript when start executing the action. Button will be execute run method and open popup by invoking JavaScript function. To show the loader we need to make page delay, for test I ...
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