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how to show "data loading" in a jsp page using servlets

Answer 1

+1 A:

AJAX is the way to do it. You'll need something on the server side to help you keep track of progress.

duffymo 2010-07-18 16:33:58

Answer 2

A:

Load your data (in b.jsp) with ajax request.

Make a JS function which starts on load, let it show your message ('30 seconds left') and then let it perform ajax request to load necessary data.

I recommend you to use some js-framework, like jQuery, it'll make things much simplier.

In order to handle ajax-request on the server-side you'll need to create one more servlet and map it to some url, like your_app_name/ajaxsupport. This servlet should return data in some convenient format (it can be plain text, or xml, or JSON or whatever else). On the client you'll process received data and show it.

Roman 2010-07-18 16:35:07

Answer 3

+1 A:

calling DB in jsp would be very much frowned upon. given the premise of the question, you could

//b.jsp

<div id="msg">data is loading...</div>

<% 
   out.flush();
   db.performanLengthJob(); 
%>

<script> $("msg").remove(); </script>

<p>Data is loaded!</p>

irreputable 2010-07-18 17:29:13

Answer 4

A:

A quick solution can be to use onbeforeunload JS event of your base page html body s.g. like

<body onbeforeunload="$("yourComponent").show();">

gubra 2010-07-18 22:10:14

The `beforeunload` is only called whenever the client is about to close the window or to navigate away, not when the window is finished loading.

BalusC 2010-07-19 11:51:41

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how to show "data loading" in a jsp page using servlets

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