javascript - Pass in an array of Deferreds to $.when() -

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here's contrived example of what's going on: http://jsfiddle.net/adamjford/yngcm/20/

html:

<a href="#">click me!</a> <div></div>

javascript:

function getsomedeferredstuff() {     var deferreds = [];      var = 1;     (i = 1; <= 10; i++) {         var count = i;          deferreds.push(         $.post('/echo/html/', {             html: "<p>task #" + count + " complete.",             delay: count         }).success(function(data) {             $("div").append(data);         }));     }      return deferreds; }  $(function() {     $("a").click(function() {         var deferreds = getsomedeferredstuff();          $.when(deferreds).done(function() {             $("div").append("<p>all done!</p>");         });     }); });

i want "all done!" appear after of deferred tasks have completed, $.when() doesn't appear know how handle array of deferred objects. "all done!" happening first because array not deferred object, jquery goes ahead , assumes it's done.

i know 1 pass objects function $.when(deferred1, deferred2, ..., deferredx) it's unknown how many deferred objects there @ execution in actual problem i'm trying solve.

to pass array of values any function expects them separate parameters, use function.prototype.apply, in case need:

$.when.apply($, my_array).then( ___ );

see http://jsfiddle.net/yngcm/21/

in es6, can use ... spread operator instead:

$.when(...my_array).then( ___ );

in either case, since it's unlikely you'll known in advance how many formal parameters .then handler require, handler need process arguments array in order retrieve result of each promise.


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