Ajax DataTable to show a "Loading" Indicator on pre-/post-Render. drawCallback() is called twice
Ajax DataTable to show a "Loading" Indicator on pre-/post-Render. drawCallback() is called twice
Eugene_B
Posts: 19Questions: 8Answers: 0
For an Ajax DataTable, I need to show a "Loading..." overlay on Pre-Render and hide it on Post-Render.
Sounds simple and the following solution works,
// Show Loading Overlay on pre-render (drawCallback gets called twice both before and after render, strangely)
"drawCallback" : function(settings) {
$('#loadingProgressOverlay').show();
},
// Hide Loading Overlay on post-render (initComplete gets called only once at the very end)
"initComplete": function(settings, json) {
$('#loadingProgressOverlay').hide();
},
But just as the following user found, drawCallback gets called twice both before & after the render . So this solution isn't clean. How can I isolate just the pre-render moment?
https://datatables.net/forums/discussion/8852/run-a-function-after-ajax-request-finished
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Answers
Use the
preXhrevent. This way your loading message starts before the Ajax request.Kevin
Hi, the
preXhrevent never gets called in my code.drawCallbackdoes get called butpreXhrdoes not. I verified it as follows. I see thedrawCallbackalert but not thepreXhrone.ITs an event not an initialization option. Use the syntax in the docs and place it before the Datatables init code. Like this:
Kevin