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A study in jQuery deferreds, based on Lu4's answer to “jQuery deferreds and promises - .then() vs .done()”.
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>jQuery deferreds and promises - .then() vs .done()</title> | |
| <link rel="stylesheet" href="http://code.jquery.com/qunit/qunit-git.css"> | |
| </head> | |
| <body> | |
| <p> | |
| A study in jQuery deferreds, based on <em>Lu4's</em> <a | |
| href="http://stackoverflow.com/a/15694010/27581">answer to “jQuery | |
| deferreds and promises - .then() vs .done()”</a>. | |
| </p> | |
| <div id="qunit"></div> | |
| <div id="qunit-fixture"></div> | |
| <script src="http://code.jquery.com/qunit/qunit-1.12.0.js"></script> | |
| <script src="http://code.jquery.com/jquery-1.11.0.js"></script> | |
| <script type="text/javascript"> | |
| asyncTest('then then then', function () { | |
| var promise = $.Deferred().resolve('abc'); | |
| promise.then(function (x) { | |
| equal(x, 'abc'); | |
| return 123; | |
| }).then(function (x){ | |
| equal(x, 123); | |
| }).then(function (x){ | |
| equal(x, undefined) | |
| start(); | |
| }); | |
| }); | |
| asyncTest('done done done', function() { | |
| var promise = $.Deferred().resolve('abc'); | |
| promise.done(function (x) { | |
| equal(x, 'abc'); | |
| return 123; | |
| }).done(function (x) { | |
| equal(x, 'abc'); | |
| }).done(function (x) { | |
| equal(x, 'abc'); | |
| start(); | |
| }); | |
| }); | |
| asyncTest('done then then done done', function () { | |
| var promise = $.Deferred().resolve('abc'); | |
| promise.done(function (x) { | |
| equal(x, 'abc'); | |
| return 123; | |
| }).then(function (x) { | |
| equal(x, 'abc'); | |
| }).then(function (x) { | |
| equal(x, undefined); | |
| return 456; | |
| }).done(function (x) { | |
| equal(x, 456); | |
| }).done(function (x) { | |
| equal(x, 456); | |
| start(); | |
| }); | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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Thanks for doing this work, I wasn't sure they were different; I think then() is not as safe as done() but offers a nice way to cascade results.