Example of when in Promises

by sandeep45

HTML

<body />

JavaScript

d1 = $.Deferred();
p1 = d1.promise();

d2 = $.Deferred();
p2 = d2.promise();

d3 = $.Deferred();
p3 = d3.promise();

p4 = $.when(p1,p2,p3);

p4.then(function(){ $("body").append("<h1>p4 which is combnation of p1, p2 and p3 is now done</h1>"); });

window.setTimeout(function(){ 
  $("body").append("<h4>d1 is resolved as 1 second has paased");
  d1.resolve();  
}, 1000);
window.setTimeout(function(){ 
  $("body").append("<h4>d2 is resolved as 2 second has paased");
  d2.resolve();  
}, 2000);
window.setTimeout(function(){ 
  $("body").append("<h4>d3 is resolved as 3 second has paased");
  d3.resolve();  
}, 3000);