Mobile Web Application 甘苦談

Transcript

1. Mobile Web Application ⽢甘苦談 othree @ MOPCON 2013
2. me • @othree • MozTW member • PhD Candidate of civil engineering • F2E at HTC • https://blog.othree.net/
3. • Front End related • Experience sharing • No code listing
4. Why Mobile • We are HTC....
5. Mozilla Summit 2013
6. Mozilla Summit 2013
7. PM Says “We are going to support mobile browsers”
8. What We Thought • Web Standards rule the web • Not big problem
9. Reality • Browser have bugs • Standard implementation not the same • Ambiguous standards • Hard to debug on some browser • Any issue might be new, not like IE
10. Reality • Browser have bugs • Standard implementation not the same • Ambiguous standards • Hard to debug on some browser • Any issue might be new, not like IE Survey
11. What browser you use on smartphone?
12. What browser you use on smartphone? b) You install browser by yourself a) Default browser from your phone
13. Android Browser
14. Android Browser • No updates anymore • Google use Chrome as new default • Still exists: HTC, Samsung Galaxy S3
15. Mozilla Summit 2013
16. • Have bugs, issues
17. S4 Chrome?
18. S4 Chrome?
20. Suggestion to Users • Use Chrome or Firefox or …
21. So...
22. So... Issues
23. Issues • No repaint • Ghost Click • Toggle location bar will not trigger resize • preventDefault not work on touch event • HTML5 Video
24. Repaint • To save power, browser will reduce repaint • It predicts best timing for repaint, what to repaint • Prediction might fail
25. If Not Repaint • Things will disappear, in wrong position...etc
26. Force Repaint • Access some attribute related to layout • ex: offsetHeight
27. Ghost Click • Mobile device don’t have real ‘click’ event • Simulate ‘click’ using touch events • ‘click’ has 300ms delay after ‘touchend’

28. Avoid Lag • Use ‘touchend’ • tap.js
 https://github.com/alexgibson/tap.js • fastbutton
 https://developers.google.com/mobile/ articles/fast_buttons
29. But.. • Android Browser • Trigger simulated click on wrong element
30. Demo
31. Location Bar • 3 states in Android Browser • show • hide • pinned
32. Location Bar • 3 states in Android Browser • show • hide • pinned
36. What’s the Deal • Window size changes • Trigger ‘resize’ event? • Android 2: Yes • Android 3: No http://www.quirksmode.org/dom/events/resize_mobile.html
37. Fix • Time Interval to check window size change • 200ms interval will cause video not play • Manuel trigger resize handler when window size might change
38. preventDefault • Can used to prevent user scroll web page • Not work on HTC browser • Not a bug, its spec...
39. HTML5 Video • Loop not work • Play event not reliable • Duration update issue • iPhone, iPod have different implementation
40. Loop • Video loop not work on all mobile browser • But you can call `play()` on ‘ended’ event
41. Video Bugs • ‘play’, ‘playing’ event not reliable • Duration have default value • Won't stop when buffer ready even if `pause()` were called
42. MOPCON 2013
43. pause() not work play() download buffer pause() buffer ready, play playing play
44. RobustVideo • A video wrapper to fix issues above • https://github.com/othree/robust-video
45. iPhone • Open native player to play HTML5 video
46. iPhone • Open native player to play HTML5 video
49. Limitation • Video needs visible to be able to play • Poster will not used to render in web page • No video event is available
50. Limitation • Video needs visible to be able to play • Poster will not used to render in web page • No video event is available
51. Tip • Video element outside of window • Tap img(poster) to trigger `video.play()`
52. Tip • Video element outside of window • Tap img(poster) to trigger `video.play()` <video> <img>
53. 呼...
54. Next Time PM Says “We are going to support mobile browsers”
55. We Say “Well, it takes x times longer to do it.”
56. We Say “Well, it takes x times longer to do it.” Mobile Debugging
 How to
57. Browsers • Safari • Chrome • Firefox/Opera • Android Browser
58. Safari • Enable Debug • Connect iDevice to your Mac • Open Safari https://developer.apple.com/library/ios/documentation/AppleApplications/Reference/SafariWebContent/DebuggingSafarioniPhoneContent/DebuggingSafarioniPhoneContent.html
59. Chrome • Install the ADB Chrome extension • Install driver of your device • Enable Debug • Connect device to PC/Mac https://developers.google.com/chrome-developer-tools/docs/remote-debugging
61. Firefox • https://hacks.mozilla.org/2012/08/remote- debugging-on-firefox-for-android/
62. Android Browser • Weinre
    http://people.apache.org/~pmuellr/weinre/ docs/latest/

68. Demo Q
69. Thanks