Learning jQuery Deferreds

Copyright......Page 4
Table of Contents......Page 5
Preface......Page 9
Our Aims......Page 10
jQuery Deferreds......Page 11
Conventions Used in This Book......Page 12
Safari® Books Online......Page 13
Acknowledgments......Page 14
Food for Thought......Page 17
Terminology: Deferreds and Promises......Page 19
Familiar Promises......Page 20
Chapter€2.€The jQuery Deferred API......Page 23
More Terminology: Resolve, Reject and Progress......Page 24
fail......Page 25
progress......Page 26
then......Page 27
when......Page 29
Construction......Page 31
resolve and resolveWith......Page 32
Putting It All Together......Page 33
Deferred Dynamics......Page 34
Changes in the jQuery Deferred API......Page 35
A Replacement for the setTimeout Function......Page 37
Challenges......Page 38
Messaging in Chrome Extensions......Page 39
Challenges......Page 40
Accessing Chrome Local Storage......Page 41
Running Promise-Returning Functions One by One......Page 42
A Promise Pool with an emptyPromise Method......Page 44
Creating a Promise Pool......Page 45
Using the Promise Pool......Page 46
Challenges......Page 47
Displaying Google Maps......Page 48
Challenges......Page 52
The Web Worker Code......Page 53
Creating a Web Worker......Page 55
Using It......Page 56
Challenges......Page 57
The Web Socket Server......Page 58
The Web Socket Client......Page 60
Challenges......Page 62
Automatically Retrying Failing Deferred Calls......Page 63
Challenges......Page 64
Memoization......Page 65
Discussion......Page 66
Challenges......Page 67
Short-Term Memoization of In-Progress Function Calls......Page 68
Challenges......Page 69
Delivering More Information......Page 70
Delegating the Event Stream......Page 71
Challenges......Page 72
Getting the First Result from a Set of Promises......Page 73
Which Promise Fired?......Page 74
delegateEventStream Redux......Page 75
Challenges......Page 76
A Deferred Queue......Page 77
when2: An Improved jQuery.when......Page 79
Using when2 to Time Out a Single Promise......Page 83
Differences from $.when......Page 84
Timing Out Promises......Page 85
Challenges......Page 88
Controlling Your Own Destiny......Page 89
Deactivating a Promise......Page 90
Challenges......Page 92
Do You Really Understand jQuery Deferreds?......Page 93
Promises/A+......Page 94
Promises Are First-Class Objects for Function Calls......Page 95
Asynchronous Data Structures......Page 96
Advantages of Deferreds......Page 97
Difficulties with Deferreds......Page 98
Further Reading......Page 99
A Replacement for the setTimeout Function......Page 101
Accessing Chrome Local Storage......Page 102
Running Promise-Returning Functions One by One......Page 104
A Promise Pool with an emptyPromise Method......Page 105
Displaying Google Maps......Page 107
Communicating with a Web Worker......Page 108
Using Web Sockets......Page 110
Memoization......Page 111
Short-Term Memoization of In-Progress Function Calls......Page 112
Streaming Promise Events......Page 113
Getting the First Result from a Set of Promises......Page 114
A Deferred Queue......Page 117
when2: An Improved jQuery.when......Page 118
Controlling Your Own Destiny......Page 119
Deactivating a Promise......Page 120
Appendix€B.€The Promises/A+ Specification......Page 123
The then Method......Page 124
The Promise Resolution Procedure......Page 126
Appendix€C.€Converting an ArrayBuffer to Base 64......Page 129
About the Authors......Page 131