iframe programming with jquery jquery Summit 2011
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1 iframe programming with jquery jquery Summit 2011
2 who invited this guy? name s ben strange last name work at disqus co-author, Third-party JavaScript
3 disqus? dis cuss dĭ-skŭs' third-party commenting platform served on a bajillion sites we use our fair share of iframes
4 first, some history
5 frames
6
7 frames introduced in netscape navigator 2.0 (1996) standardized in html 4 frameset, frame, noframes... but obsolete in html5 (!)
8 iframes
9
10 iframes introduced in internet explorer 4.0 (1997) inline frame not going anywhere (part of html5 spec)
11 more than just embedding content
12 src-less frames
13 src-less frames separate window, DOM environment property access from parent contents load independently
14 restoring default browser objects
15 default objects undefined window JSON #tostring #indexof
16 default objects they can be modified - by anyone often in incompatible ways painful for third-party scripts
17 undefined
18 prototype & tojson
19 prototype & tojson
20 safari & chrome
21 using iframes
22 IE < 9
23 not web scale
24 sandboxing
25 sandboxing instead of taking objects/code out of an iframe, put it inside execute in clean js environment no global state leak
26 jquery sandbox
27 who s doing this?
28 twitter widget library supports multiple lib versions/ instances per page each version is sandboxed in a separate iframe dev.twitter.com/anywhere
29 iframe A iframe B
30 hiro.js QUnit-like testing library each test suite runs in a new iframe optional: seed iframe environment
31 asynchronous script loading
32 remember... stuff inside an iframe loads asynchronously Souders says so! still slower than other methods (script append, xhr)
33 iframes = slow
34 making synchronous scripts... async
35 document.write sometimes necessary evil doesn t work with async scripts you ll overwrite the whole page!
36 async + doc.write doesn t mix
37 doc.write w/ iframes tiny, synchronous outer script (outer.js) outer.js doc.writes an iframe, and loads inner.js from inside inner.js can doc.write all it wants; iframe contents load async
38 outer.js
39 google adsense
40 cross-domain tunnels
41 cross-domain ajax it doesn t work affects subdomains too can t reach api.example.com, or vice versa
42 universal solution: JSONP
43 JSONP
44 JSONP
45 JSONP script tag element bypasses same-origin policy restricted to GET requests script loading can t detect 400, 500 errors (rely on timeouts) caching is also tricky
46 alternatively, tunnels
47 xd tunnels host page creates iframe that points to url on target domain iframe can freely make xhr requests host page initiates requests through iframe
48 xd tunnels foo.com bar.com/ tunnel.html xhr bar.com/api
49 another wall how does host page communicate with iframe? same-origin policy prevents direct access window messaging apis are the solution
50 iframe messaging postmessage (HTML5) window.name url fragments flash catch em all: easyxdm
51 iframe messaging = another talk
52 so let s talk about subdomains
53 subdomain tunnel less complicated property access is possible! document.domain host and iframe must both declare common document.domain, then they can access each other s props
54 api.example.com
55
56 tunnel.html
57 downsides :( have to wait for tunnel to load extra requests, bandwidth is there a better way?
58 JSONPI json + padding + iframes (aka my awful attempt to coin something)
59
60 iframe POST
61 iframe POST create an iframe create a form set form s target=... attribute to point to iframe submit the form response loads in iframe body
62 iframe POST
63 JSONPI uses iframe POST like jsonp: pass a callback fn in response body, set common document.domain js running in iframe can execute callback fn in parent window
64 flashback: JSONP
65 vs. JSONPI
66 JSONPI response
67 questions?
68 we re looking for js engineers! disqus.com/jobs slides, sample code on github book available sometime in 2018
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