Question

我想提交一個postform請求使用下面的website的RCurl，但是表單屬性名稱的格式似乎不能用該函數讀取，因爲它使用括號和單引號。

url = "http://www5.statcan.gc.ca/cansim/a26?id=2820001" 
postForm(url, MBR['GEOGRAPHY'], style = "post") 

這導致以下錯誤：

錯誤：意想不到在 '=' 「postForm（URL，MBR [ '地理'] =」

我可以追加與URL鏈接編碼名稱和準值，像這樣：

postForm(paste(url, "&MBR%5B%27GEOGRAPHY%27%5D=2", sep=""), style = "post") 

然而，這只是讓我選擇一個地理位置，而在現實中，我要選擇的倍數（即值1,2,3和4）有其他形式。名稱，但同樣的問題適用，所以我只使用地理簡化了它。我還會包含行動％3Aa47名稱來提交表單。

如果有人知道我仍然可以使用這些[]表單名稱的postForm函數，或者使用工作方式但選擇多個值的方式，我會非常感激。

謝謝。

Answer 1

這可能會幫助你開始：

library(httr) 
library(rvest) 

POST(url = "http://www5.statcan.gc.ca/cansim/a26", 
    body = list(id = "2820001", 
     lang = "eng", retrLang = "eng", 
     accessible = "false", previewOutput = "false", 
     outputFrequency = "UNCHANGED", 
     whenConvertingFrequency = "USE_CALENDAR_YEAR", 
     manipulationOption = "DATA_AS_RETRIEVED", 
     tabMode = "customize", 
     pattern = "", p1 = "-1", 
     viewId = "1", `D1-picklist-containerL1` = "1", 
     `MBR['GEOGRAPHY']` = "6", 
     `MBR['GEOGRAPHY']` = "7", 
     `MBR['CHARACTERISTICS']` = "3", 
     `D3-picklist-containerL0` = "1", 
     `MBR['SEX']` = "1", `D4-picklist-containerAll` = "1", 
     `MBR['AGEGROUP']` = "1", 
     `MBR['AGEGROUP']` = "2", 
     `MBR['AGEGROUP']` = "3", 
     `MBR['AGEGROUP']` = "4", 
     `MBR['AGEGROUP']` = "22", 
     `MBR['AGEGROUP']` = "5", 
     `MBR['AGEGROUP']` = "6", 
     `MBR['AGEGROUP']` = "7", 
     `MBR['AGEGROUP']` = "8", 
     `MBR['AGEGROUP']` = "9", 
     `MBR['AGEGROUP']` = "10", 
     `MBR['AGEGROUP']` = "11", 
     `MBR['AGEGROUP']` = "12", 
     `MBR['AGEGROUP']` = "13", 
     `MBR['AGEGROUP']` = "14", 
     `MBR['AGEGROUP']` = "15", 
     `MBR['AGEGROUP']` = "16", 
     `MBR['AGEGROUP']` = "17", 
     `MBR['AGEGROUP']` = "18", 
     `MBR['AGEGROUP']` = "19", 
     `MBR['AGEGROUP']` = "20", 
     `MBR['AGEGROUP']` = "21", 
     smonth = "9", syear = "2016", 
     emonth = "1", eyear = "2017", 
     exporterId = "TABLE_HTML_TIME_AS_COLUMN", 
     verificationOption = "NORMAL_RETRIEVAL", 
     `action:a47` = "Apply"), 
    encode = "form") -> res 

與輸出工作：

content(res) %>% 
    html_table(fill=TRUE) 
## [[1]] 
## Geography   Age group  2016 2016  2016  2016 2017 
## 1 Geography   Age group September October November December January 
## 2 footnotes    <NA>  <NA> <NA>  <NA>  <NA> <NA> 
## 3  Quebec 15 years and over 4,208.1 4,203.9 4,178.8 4,160.5 4,112.2 
## 4  Quebec 15 to 24 years  540.8 545.3 531.5 544.5 518.4 
## 5  Quebec 25 years and over 3,667.2 3,658.6 3,647.4 3,616.0 3,593.8 
## 6  Quebec 25 to 44 years 1,852.7 1,849.4 1,842.4 1,848.5 1,837.2 
## 7  Quebec 45 to 64 years 1,663.1 1,662.1 1,658.8 1,621.8 1,612.3 
## 8  Quebec 45 years and over 1,814.5 1,809.2 1,805.0 1,767.5 1,756.6 
## 9  Quebec 25 to 54 years 2,807.8 2,785.7 2,779.7 2,763.3 2,753.9 
## 10 Quebec 55 years and over  859.4 872.9 867.7 852.7 839.9 
## 11 Quebec 15 to 64 years 4,056.7 4,056.9 4,032.7 4,014.8 3,967.9 
## 12 Quebec 15 to 19 years  163.6 161.9 170.8 176.5 174.4 
## 13 Quebec 20 to 24 years  377.3 383.4 360.6 368.1 344.0 
## 14 Quebec 25 to 29 years  445.8 429.8 429.7 432.3 435.6 
## 15 Quebec 30 to 34 years  470.8 464.8 457.0 460.4 447.7 
## 16 Quebec 35 to 39 years  481.6 501.8 508.1 506.3 515.5 
## 17 Quebec 40 to 44 years  454.5 453.0 447.5 449.4 438.5 
## 18 Quebec 45 to 49 years  449.9 441.8 441.5 435.1 430.8 
## 19 Quebec 50 to 54 years  505.2 494.5 495.8 479.7 485.9 
## 20 Quebec 55 to 59 years  449.4 456.8 457.2 446.4 441.4 
## 21 Quebec 60 to 64 years  258.7 269.1 264.3 260.6 254.2 
## 22 Quebec 65 years and over  151.4 147.0 146.2 145.7 144.3 
## 23 Quebec 65 to 69 years  95.1 99.2  97.1  90.9 92.6 
## 24 Quebec 70 years and over  56.3 47.8  49.0  54.8 51.7 
## 25 Ontario 15 years and over 6,989.5 7,041.4 7,049.9 7,033.5 6,972.5 
## 26 Ontario 15 to 24 years  874.5 902.8 905.7 890.5 856.8 
## 27 Ontario 25 years and over 6,115.0 6,138.6 6,144.2 6,143.0 6,115.7 
## 28 Ontario 25 to 44 years 3,007.5 3,013.2 3,040.7 3,039.5 3,024.8 
## 29 Ontario 45 to 64 years 2,793.3 2,811.9 2,791.7 2,791.2 2,791.1 
## 30 Ontario 45 years and over 3,107.5 3,125.4 3,103.5 3,103.5 3,090.9 
## 31 Ontario 25 to 54 years 4,611.5 4,630.8 4,666.9 4,670.4 4,647.4 
## 32 Ontario 55 years and over 1,503.5 1,507.8 1,477.3 1,472.6 1,468.3 
## 33 Ontario 15 to 64 years 6,675.4 6,727.9 6,738.1 6,721.2 6,672.7 
## 34 Ontario 15 to 19 years  265.0 279.0 271.6 264.2 258.2 
## 35 Ontario 20 to 24 years  609.6 623.8 634.1 626.3 598.6 
## 36 Ontario 25 to 29 years  773.7 761.1 766.0 761.6 751.9 
## 37 Ontario 30 to 34 years  746.8 756.1 770.8 778.0 781.2 
## 38 Ontario 35 to 39 years  759.3 757.3 754.3 756.2 739.4 
## 39 Ontario 40 to 44 years  727.7 738.7 749.6 743.7 752.3 
## 40 Ontario 45 to 49 years  733.2 745.6 741.9 747.8 750.0 
## 41 Ontario 50 to 54 years  870.8 872.0 884.3 883.1 872.6 
## 42 Ontario 55 to 59 years  727.8 732.9 728.6 723.9 727.7 
## 43 Ontario 60 to 64 years  461.5 461.3 436.9 436.4 440.8 
## 44 Ontario 65 years and over  314.1 313.5 311.8 312.3 299.8 
## 45 Ontario 65 to 69 years  206.4 206.3 205.7 206.4 195.4 
## 46 Ontario 70 years and over  107.7 107.2 106.1 105.9 104.4