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Usually when using any web page that is used to search for huge amount of data, like searching for cheap flights, user is first redirected to a page that shows progress bar e.g. ‘Now Searching Multiple Travel Sites..’, and when search on the server is done, then is redirected to actual search results.
How that is done? Is it some javascript/ajax trick?
Well you can easily set a function or event to trigger when the AJAX is finished loading. So on the submission of a form you can just set the page to display “loading…” then remove that to display the results or whatever once the AJAX is finished loading.