javascript - jQuery: how to check to make sure all asynchronous actions have been completed -

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i have web form bunch of checkboxes; when specific box clicked, shows/ hides specific div more data in it. when divs hidden/ shown, run formatting command organize , color them properly.

some checkboxes dependent on others, , cascading scheme implemented, possible, likely, several checkboxes changing state @ 1 go.

instead of writing code each checkbox, decided take shortcut , handle checkboxes same way. ended (using 2 checkboxes/ divs make point, there's bunch more):

jquery(document).ready(function () {      alternatedivs();      jquery('#accesscas, #cas_lelocspecific').on('click', function () {         showhide();     });  });  function showhide() {      var thechecks = [         {             checkid: 'accesscas',             divid: 'divcas'         },         {             checkid: 'cas_lelocspecific',             divid: 'divleloc'         }     ];          var pendingchanges = 0;      (i = 0; < thechecks.length; i++) {         var checked = jquery('#' + thechecks[i].checkid).is(':checked');         var visible = jquery('#' + thechecks[i].divid).is(':visible')         if (checked && !visible) {             pendingchanges++;             jquery('#' + thechecks[i].divid).fadein(400, function () {                 pendingchanges--;             });         } else if (!checked && visible) {             pendingchanges++;             jquery('#' + thechecks[i].divid).fadeout(400, function () {                 pendingchanges--;             });         }     } //check pending changes  }  function alternatedivs() {     jquery('.formtable:visible:odd').css('background-color', '#eeb');     jquery('.formtable:visible:even').css('background-color', '#eef'); }

it's necessary me make sure divs supposed show show properly, means must transitioned visible/ not visible state before calling alternatedivs(). can see set pendingchanges value incremented , decremented divs transitioned.

what i'd set asynchronous process check when pendingchanges equals zero, , when happens invoke alternatedivs(). want asynchronous not interfere user experience.

i believe can done through sort of callback, out of expertise area. how set , invoke asynchronous function check make sure other asynchronous functions completed, , when call function , exit?

i hope that's clear.

how putting if statement in fade callbacks?

if(pendingchanges==0){ alternatedivs() }

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