Comment Google Instant fonctionne-t-il?

Des idées sur le fonctionnement exact de la nouvelle recherche instantanée Google? Il semble que ce ne soit que des appels AJAX vers l’ancienne recherche, mais il est difficile de simplifier autant Google. Quelqu’un a des spéculations?

EDIT: Je sais que AJAX est envoyé avec chaque pression de touche, mais est-ce que c’est prédictif? Ou pensez-vous que ce n’est qu’une recherche régulière de Google?

MISE À JOUR: Google vient de publier un article de blog appelé Google Instant, dans les coulisses . C’est une lecture intéressante et évidemment liée à cette question. Vous pouvez lire comment ils ont traité la charge supplémentaire (5-7X selon l’article) du côté serveur, par exemple. La réponse ci-dessous examine ce qui se passe du côté client:


En examinant avec Firebug , Google fait une requête Ajax GET à chaque pression de touche:

Recherche instantanée sur Google

Je suppose que cela fonctionne de la même manière que l’auto-complétion. Cependant, cette fois, il renvoie également les résultats de recherche de la phrase de recherche partiellement complète au format JSON .

Examiner l’une des réponses JSON en tapant “Stack Overflow”:

Poneys de recherche instantanée Google

Nous pouvons voir que la réponse JSON contient le contenu pour construire les résultats de la recherche lors de la saisie.

Les réponses JSON formatées ressemblent à ceci:

{ e: "j9iHTLXlLNmXOJLQ3cMO", c: 1, u: "http://www.google.com/search?hl\x3den\x26expIds\x3d17259,24472,24923,25260,25901,25907,26095,26446,26530\x26sugexp\x3dldymls\x26xhr\x3dt\x26q\x3dStack%20Overflow\x26cp\x3d6\x26pf\x3dp\x26sclient\x3dpsy\x26aq\x3df\x26aqi\x3dg4g-o1\x26aql\x3d\x26oq\x3dStack+\x26gs_rfai\x3d\x26pbx\x3d1\x26fp\x3df97fdf10596ae095\x26tch\x3d1\x26ech\x3d1\x26psi\x3dj9iHTO3xBo2CONvDzaEO12839712156911", d: "\x3clink rel\x3dprefetch href\x3d\x22http://stackoverflow.com/\x22\x3e\x3cscript\x3eje.pa(_loc, \x27rso\x27, \x27\\x3c!--m--\\x3e\\x3clink rel\\x3dprefetch href\\x3d\\x22http://stackoverflow.com/\\x22\\x3e\\x3cli class\\x3dg\\x3e\\x3ch3 class\\x3d\\x22r\\x22\\x3e\\x3ca href\\x3d\\x22http://stackoverflow.com/\\x22 class\\x3dl onmousedown\\x3d\\x22return rwt(this,\\x27\\x27,\\x27\\x27,\\x27\\x27,\\x271\\x27,\\x27AFQjCNERidL9Hb6OvGW93_Y6MRj3aTdMVA\\x27,\\x27\\x27,\\x270CBYQFjAA\\x27)\\x22\\x3e\\x3cem\\x3eStack Overflow\\x3c/em\\x3e\\x3c/a\\x3e\\x3c/h3\\x3e\\x3cdiv class\\x3d\\x22s\\x22\\x3eA language-independent collaboratively edited question and answer site for programmers.\\x3cbr\\x3e\\x3cspan class\\x3df\\x3e\\x3ccite\\x3e\\x3cb\\x3estackoverflow\\x3c/b\\x3e.com/\\x3c/cite\\x3e - 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First, I wanted a dorky programming-related domain \\x3cb\\x3e...\\x3c/b\\x3e\\x3cbr\\x3e\\x3cspan class\\x3df\\x3e\\x3ccite\\x3e\\x3cb\\x3estackoverflow\\x3c/b\\x3e.org/\\x3c/cite\\x3e - \\x3cspan class\\x3dgl\\x3e\\x3ca href\\x3d\\x22http://webcache.googleusercontent.com/search?q\\x3dcache:u0dIlJW-XMYJ:stackoverflow.org/+Stack+Overflow\\x26amp;cd\\x3d9\\x26amp;hl\\x3den\\x26amp;ct\\x3dclnk\\x22 onmousedown\\x3d\\x22return rwt(this,\\x27\\x27,\\x27\\x27,\\x27\\x27,\\x279\\x27,\\x27AFQjCNHcJcV2QVybr6voztyPwHCrNOOD1w\\x27,\\x27\\x27,\\x270CEMQIDAI\\x27)\\x22\\x3eCached\\x3c/a\\x3e - \\x3ca href\\x3d\\x22/search?hl\\x3den\\x26amp;q\\x3drelated:stackoverflow.org/+Stack+Overflow\\x26amp;tbo\\x3d1\\x26amp;sa\\x3dX\\x26amp;ei\\x3dj9iHTLXlLNmXOJLQ3cMO\\x26amp;sqi\\x3d2\\x26amp;ved\\x3d0CEQQHzAI\\x22\\x3eSimilar\\x3c/a\\x3e\\x3c/span\\x3e\\x3c/span\\x3e\\x3c/div\\x3e\\x3c!--n--\\x3e\\x3c!--m--\\x3e\\x3cli class\\x3dg\\x3e\\x3ch3 class\\x3d\\x22r\\x22\\x3e\\x3ca href\\x3d\\x22http://embeddedgurus.com/stack-overflow/\\x22 class\\x3dl onmousedown\\x3d\\x22return rwt(this,\\x27\\x27,\\x27\\x27,\\x27\\x27,\\x2710\\x27,\\x27AFQjCNFYQ5E8irNUCpRsbOHHyfc0oqGpWw\\x27,\\x27\\x27,\\x270CEUQFjAJ\\x27)\\x22\\x3e\\x3cem\\x3eStack Overflow\\x3c/em\\x3e\\x3c/a\\x3e\\x3c/h3\\x3e\\x3cdiv class\\x3d\\x22s\\x22\\x3e\\x3cem\\x3eStack Overflow\\x3c/em\\x3e. Nigel Jones. Nigel Jones has over 20 years of experience designing electronic circuits and firmware. (full bio). Pages. Contact Nigel. 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Autre lecture non technique:

  • Google Adwords – Qu’est-ce que Google Instant?
  • À propos de Google Instant

Comme d’autres l’ont dit, Google retourne instantanément les résultats pour le meilleur résultat de ce que Google Suggest suggère . Par conséquent, si vous saisissez fac , Google Suggests pense que vous tapez sur facebook . Fait intéressant, seul le terme de recherche partielle, fac , est envoyé à Google dans la requête JSON, de sorte que Google Suggest est utilisé aux deux extrémités.

Les recherches ne sont pas réellement effectuées à chaque frappe. Si vous tapez assez vite, certains peuvent manquer.

Je soupçonne que cela n’augmente pas la charge sur les serveurs de Google autant que vous le pensez. La plupart des recherches supplémentaires concernent des mots très populaires lorsque vous commencez à taper des éléments – si vous commencez à chercher quelque chose commençant par f , il recherchera Facebook , si vous commencez à chercher quelque chose commençant par ju , il recherchera justin bieber . Grâce à la mise en cache, ces recherches ne coûtent pas très cher.

C’est prédictif. Les résultats de la recherche proviennent de la première suggestion de saisie semi-automatique (ou de celle suggérée si vous appuyez sur la flèche vers le bas ou sur la souris au-dessus d’une suggestion).

En d’autres termes, si je tape “vinyl s”, la première suggestion de saisie semi-automatique est “bardage en vinyle” et les résultats de la recherche indiquent clairement une recherche de “bardage en vinyle”. Si je fais une recherche google normale pour “vinyl s”, les résultats de la recherche sont différents.

Donc, Google Instant est prédictif d’une manière que les recherches normales de Google ne sont pas … il recherche l’auto-complétion suggérée au lieu de la requête de recherche non finie littérale.

La conversion de la première valeur de la clé u dans la réponse Ajax de Daniel Vassallo donne une URL , qui mène alors à un JSON (non valide). Je ne suis pas sûr de ce que ce bit est pour encore.

Le d donne du HTML, qui est inséré dans la page. Voici une version légèrement décompressée . C’est principalement une balise de script, qui transmet 2 autres morceaux de HTML à une fonction je.pa() . Ces morceaux semblent être les mêmes que les résultats de recherche non instantanée.

Il y a quelque temps, j’ai écrit une interface de recherche instantanée vaguement populaire pour le moteur de recherche Solr. C’est vraiment simple, vous devriez donc pouvoir regarder le code et comprendre les concepts généraux http://fergiemcdowall.github.io/solrstrap/