我試圖用nokogiri來選擇一個DOM元素，但它似乎是返回一個空數組。用Nokogiri解析源html的麻煩
我運行此代碼：
require "open-uri"
require "nokogiri"
doc = Nokogiri::HTML(open("http://twitter.com/#!/ladygaga"))
，並返回被引入nokogiri解析整個源代碼。
然而，當我運行
doc.css(".stream-tweet")
它返回一個空數組。 .stream-tweet是我通過檢查源代碼找到的http://twitter.com/#!/ladygaga多個div元素的類。
這是怎麼回事嗎？
因爲沒有div元素，因此如果您看doc，請使用stream-tweet類。
該div隨後通過AJAX請求加載到twitter api。
@NARKOZ對你的問題有正確的答案，你爲什麼試圖做的不工作。你應該接受這個答案。
解決您的問題，試試這個：
require 'open-uri'
require 'json'
require 'pp'
gaga = JSON.parse(open('http://api.twitter.com/1/statuses/user_timeline.json?include_entities=1&include_available_features=1&contributor_details=true&include_rts=true&user_id=14230524').read)
pp gaga.map{ |tweet| tweet['text'] }[0..3]
#=> ["Here's my LIVE radio performance on the Howard Stern Show! http://bit.ly/pighVL\"",
#=> "Thanks baby. I'm a die hard monsterfan [email protected]: @ladygaga 's album speaks to me more than any other album ever. #diehardfan",
#=> "http://twitpic.com/5s4f2h - Just left @HowardStern, rockers with long hair have a sweetspot for girls like me. He was a doll. :)",
#=> "SURPRISE MONSTERS! You can find a link to a more readable format of my V Mag Pop Culture Column on http://t.co/ekIJBXo My new blog!"]
這裏是整個JSON看起來像作爲散列的紅寶石陣列（截斷堆棧溢出）：
[{"in_reply_to_status_id"=>nil,
"user"=>
{"time_zone"=>"Quito",
"friends_count"=>142497,
"protected"=>false,
"location"=>"New York, NY",
"is_translator"=>false,
"following"=>true,
"profile_use_background_image"=>true,
"name"=>"Lady Gaga",
"follow_request_sent"=>false,
"statuses_count"=>968,
"profile_background_color"=>"9AE4E8",
"url"=>"http://www.ladygaga.com",
"default_profile"=>false,
"verified"=>true,
"profile_background_image_url"=>
"http://a1.twimg.com/profile_background_images/203383875/Unnamed-1.jpg",
"utc_offset"=>-18000,
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"https://si0.twimg.com/profile_background_images/203383875/Unnamed-1.jpg",
"favourites_count"=>2,
"created_at"=>"Wed Mar 26 22:37:48 +0000 2008",
"profile_text_color"=>"333333",
"profile_image_url_https"=>
"https://si0.twimg.com/profile_images/1239447061/Unnamed-1_normal.jpg",
"profile_image_url"=>
"http://a1.twimg.com/profile_images/1239447061/Unnamed-1_normal.jpg",
"listed_count"=>208144,
"profile_sidebar_fill_color"=>"DDFFCC",
"description"=>"mother mons\u2020er\r\n",
"contributors_enabled"=>false,
"lang"=>"en",
"profile_background_tile"=>true,
"followers_count"=>11781463,
"screen_name"=>"ladygaga",
"id_str"=>"14230524",
"profile_link_color"=>"0084B4",
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"geo_enabled"=>false,
"notifications"=>true,
"profile_sidebar_border_color"=>"BDDCAD"},
"created_at"=>"Tue Jul 19 18:09:40 +0000 2011",
"geo"=>nil,
"in_reply_to_user_id"=>nil,
"favorited"=>false,
"text"=>
"Here's my LIVE radio performance on the Howard Stern Show! http://bit.ly/pighVL\"",
"in_reply_to_status_id_str"=>nil,
"entities"=>
{"user_mentions"=>[],
"urls"=>
[{"url"=>"http://bit.ly/pighVL",
"indices"=>[59, 79],
"expanded_url"=>nil}],
"hashtags"=>[]},
"in_reply_to_screen_name"=>nil,
"in_reply_to_user_id_str"=>nil,
"place"=>nil,
"coordinates"=>nil,
"truncated"=>false,
"source"=>
"<a href=\"http://blackberry.com/twitter\" rel=\"nofollow\">Twitter for BlackBerry\u00AE</a>",
"id_str"=>"93382007496769536",
"contributors"=>nil,
"retweeted"=>false,
"retweet_count"=>"100+",
"id"=>93382007496769536},
{"in_reply_to_status_id"=>nil,
"user"=>
{"time_zone"=>"Quito",
"protected"=>false,
"location"=>"New York, NY",
"contributors_enabled"=>false,
"following"=>true,
"profile_use_background_image"=>true,
"name"=>"Lady Gaga",
"default_profile_image"=>false,
"profile_background_color"=>"9AE4E8",
"url"=>"http://www.ladygaga.com",
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"verified"=>true,
"profile_background_image_url"=>
"http://a1.twimg.com/profile_background_images/203383875/Unnamed-1.jpg",
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"friends_count"=>142497,
"is_translator"=>false,
"show_all_inline_media"=>false,
"geo_enabled"=>false,
"favourites_count"=>2,
"created_at"=>"Wed Mar 26 22:37:48 +0000 2008",
"follow_request_sent"=>false,
"profile_text_color"=>"333333",
"profile_image_url"=>
"http://a1.twimg.com/profile_images/1239447061/Unnamed-1_normal.jpg",
"profile_sidebar_fill_color"=>"DDFFCC",
"description"=>"mother mons\u2020er\r\n",
"lang"=>"en",
"statuses_count"=>968,
"profile_background_tile"=>true,
"followers_count"=>11781456,
"screen_name"=>"ladygaga",
"id_str"=>"14230524",
"listed_count"=>208145,
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"https://si0.twimg.com/profile_background_images/203383875/Unnamed-1.jpg",
"profile_link_color"=>"0084B4",
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"profile_sidebar_border_color"=>"BDDCAD",
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"https://si0.twimg.com/profile_images/1239447061/Unnamed-1_normal.jpg"},
"created_at"=>"Tue Jul 19 17:51:11 +0000 2011",
"geo"=>nil,
"in_reply_to_user_id"=>nil,
"favorited"=>false,
"text"=>
"Thanks baby. I'm a die hard monsterfan [email protected]: @ladygaga 's album speaks to me more than any other album ever. #diehardfan",
"in_reply_to_status_id_str"=>nil,
"entities"=>
{"hashtags"=>[{"indices"=>[115, 126], "text"=>"diehardfan"}],
"user_mentions"=>
[{"name"=>"Lady Gaga",
"indices"=>[50, 59],
"screen_name"=>"ladygaga",
"id_str"=>"14230524",
"id"=>14230524}],
"urls"=>[]},
"in_reply_to_screen_name"=>nil,
"in_reply_to_user_id_str"=>nil,
"place"=>nil,
"coordinates"=>nil,
"truncated"=>false,
"source"=>
"<a href=\"http://blackberry.com/twitter\" rel=\"nofollow\">Twitter for BlackBerry\u00AE</a>",
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"id"=>93377358974812161},
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{"time_zone"=>"Quito",
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"following"=>false,
"profile_use_background_image"=>true,
"profile_background_image_url_https"=>
"https://si0.twimg.com/profile_background_images/203383875/Unnamed-1.jpg",
"name"=>"Lady Gaga",
"profile_background_color"=>"9AE4E8",
"url"=>"http://www.ladygaga.com",
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"https://si0.twimg.com/profile_images/1239447061/Unnamed-1_normal.jpg",
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"profile_background_tile"=>true,
"followers_count"=>11781392,
"screen_name"=>"ladygaga",
"follow_request_sent"=>false,
"id_str"=>"14230524",
"profile_link_color"=>"0084B4",
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"notifications"=>false,
"profile_sidebar_border_color"=>"BDDCAD"},
"created_at"=>"Mon Jul 18 14:30:46 +0000 2011",
"geo"=>nil,
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"favorited"=>false,
"text"=>
"http://twitpic.com/5s4f2h - Just left @HowardStern, rockers with long hair have a sweetspot for girls like me. He was a doll. :)",
"in_reply_to_status_id_str"=>nil,
"entities"=>
{"hashtags"=>[],
"user_mentions"=>
[{"name"=>"Howard Stern",
"indices"=>[38, 50],
"screen_name"=>"HowardStern",
"id_str"=>"246481013",
"id"=>246481013}],
"urls"=>
[{"url"=>"http://twitpic.com/5s4f2h",
"indices"=>[0, 25],
"expanded_url"=>nil}]},
"in_reply_to_screen_name"=>nil,
"in_reply_to_user_id_str"=>nil,
"place"=>nil,
"coordinates"=>nil,
"truncated"=>false,
"source"=>
"<a href=\"http://blackberry.com/twitter\" rel=\"nofollow\">Twitter for BlackBerry\u00AE</a>",
"id_str"=>"92964531315294209",
"contributors"=>nil,
"retweeted"=>false,
"retweet_count"=>"100+",
"id"=>92964531315294209},
{"in_reply_to_status_id"=>nil,
"user"=>
{"follow_request_sent"=>false,
"time_zone"=>"Quito",
"protected"=>false,
"location"=>"New York, NY",
"show_all_inline_media"=>false,
"following"=>true,
"geo_enabled"=>false,
"profile_use_background_image"=>true,
"name"=>"Lady Gaga",
"default_profile"=>false,
"profile_background_color"=>"9AE4E8",
"url"=>"http://www.ladygaga.com",
"verified"=>true,
"profile_background_image_url"=>
"http://a1.twimg.com/profile_background_images/203383875/Unnamed-1.jpg",
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"profile_background_image_url_https"=>
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"profile_sidebar_border_color"=>"BDDCAD"},
"created_at"=>"Mon Jul 18 11:24:18 +0000 2011",
"geo"=>nil,
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"favorited"=>false,
"text"=>
"SURPRISE MONSTERS! You can find a link to a more readable format of my V Mag Pop Culture Column on http://t.co/ekIJBXo My new blog!",
"in_reply_to_status_id_str"=>nil,
"entities"=>
{"user_mentions"=>[],
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[{"url"=>"http://t.co/ekIJBXo",
"display_url"=>"tinyurl.com/3p42npn",
"indices"=>[99, 118],
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"source"=>
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很酷。你如何獲得CSS樣式？ –
@Justin你如何解釋你正在嘗試做什麼。你想要什麼CSS樣式？你試圖欺騙Twitter的外觀和標記自己？ – Phrogz
基本上我試圖框架網站哈哈。我不認爲他們允許它（他們使用javascript打開任何iframe），我試圖找到解決方法。 –
是有辦法讓'doc'格式化更好？你究竟是什麼意思「實際div加載之後通過JavaScript的Twitter API」。 –
沒有辦法與nokogiri做到這一點，因爲nokogiri無法解析ajax請求的結果。你爲什麼需要它？大概你可以使用twitter api。 – NARKOZ
@Justin NARKOZ的含義是，如果你「查看源代碼」（並且不檢查元素），你會發現你聲明的HTML在原始HTTP響應中並不存在。相反，JavaScript代碼在網站上運行，並最終從11（！）個不同的XHR JSON請求中獲得內容。 JavaScript然後用這些類動態地在頁面上構建元素。 Nokogiri不是一個完整的Web瀏覽器，並且不運行JavaScript。 – Phrogz