Question

我刚接触过光泽，并询问是否可以做些什么。我想允许用户输入文本搜索词，并返回描述中出现用户搜索词的数据框的行。

例如，如果用户输入“环绕”，“便携式音频”，“技术”，“ mp3”，则将返回包含至少一个搜索词的所有行。每行中的类别列不必包含所有搜索词，但必须至少包含这些词之一。

我希望允许用户将搜索词作为文本字符串输入，而不是创建过滤器复选框，因为我不想将它们限制为仅特定的搜索词。一旦用户输入了搜索词，这些搜索词必须用逗号-分隔，这些词将被分成一系列值。这样，用户可以将多个单词存储为一个搜索词。例如，“便携式音频”将被存储为一个搜索词，而不是红色且大小写被单独存储。

我有一个包含销售数据的大型数据集，并且在下面包括了一个样本数据集。该数据集包括一个带有每个产品类别描述的文本列。

rm(list=ls())
ID<-c("AG138", "HF249", "KI786", "DS264", "WQ987", "HS682", "UI987", 
"SA376")

Price<-c("40","60","100","85","65","120","38","250")

Condition<-c("New","Used - Excellent","New", "New","Used - Good","New", 
"New","Used - Excellent")

Category<-c("Computers,Office,Computer Accessories,Computer Accessories 
& Peripherals,Laptop Accessories,Laptop Chargers & Adapters,Computers & 
Tablets,Electronics,Battery Chargers,Batteries,Office Technology",

"Surround Speakers,Electronics Features,Surround Sound 
Systems,Frys,Electronics,All Home Theater Systems,TVs 
Entertainment,Speakers,Home Audio & Theater,Home Electronics,TV Sound 
Systems rxxbwxxcscxuvutetd,Home & Kitchen Features,Home Theater 
Systems,Audio Speakers,TV Sound Systems,Home Audio,Home 
Theater,Electrical,Audio",

"Bluetooth & Wireless Speakers,Portable Audio & 
Video,Electronics,MP3 & MP4 Player Accessories,Portable 
Speakers,Audio",

"Computers,Internal Hard Drives,Internal Drives,Drives, Storage 
& Blank Media,Computers & Accessories,Hard Drives (HDD, SSD & 
NAS),Computer Accessories & Peripherals,Internal Hard Disk 
Drives,Electronics,Hard Drives & Storage,Drives 
Storage,Computers/Tablets & Networking,Computer Components,Computers & 
Tablets,Data Storage",

"Parts & Accessories,Car Speakers,6.5\\ Car 
Speakers,Electronics,Car Electronics,Speakers,eBay Motors,Car 
Audio,Consumer Electronics,Auto & Tires,All Car Speakers & 
Subwoofers,Coaxial Speakers,Speakers & Speaker Systems,Car & Vehicle 
Electronics,Auto Electronics,Car Speakers & Speaker Systems,Car 
Speakers and Subwoofers,Vehicle Electronics & GPS,Car Electronics & 
GPS",

"In-Wall & In-Ceiling Speakers,In-Ceiling Speakers,Home 
Audio,Speakers,Audio",

"Straps & Hand Grips,Camera & Photo Accessories,Camera 
Accessories,Cameras & Photo,Digital Camera 
Accessories,Electronics,Camera Straps,Cameras & 
Camcorders,Photography,Other Camera Accessories,Camera Straps 
Harnesses,Photography Bags Cases,Camera Bags, Cases & Straps",

"LCD TVs,Samsung TVs,Electronics,Shop TVs by 
Type,Televisions,TVs Entertainment,TV & Home Theater,TVs by Brand,All 
Flat-Panel TVs,All TVs,LED & LCD TVs,TVs,TV & Video,Television & 
Video,LED TVs")


sales_df<-data.frame(ID, Price, Condition, Category,  
stringsAsFactors=FALSE)



library(shiny)
library(DT)
shinyApp(
  ui <- fluidPage(
    setBackgroundColor("ghostwhite"),
    titlePanel("Sales Catalogue"),
    sidebarLayout(position = "left",
                  sidebarPanel(
                    tabsetPanel(id = "tabset",
                                tabPanel("Search",
                                         textInput("search_input", 
"Input Search Terms", "Input Search Terms (comma delimited)"),

verbatimTextOutput("search_value"))
                    ),
                    actionButton("go", "Filter Data")
                  ),
                  mainPanel(
                    DT::dataTableOutput("sales_table") 
                  )
    )
  ), 
  server = function(input, output) {
    terms <- unlist(strsplit("search_input", ","))
    grepl(Category, terms)
    #if True is the result at least once, return row in filtered 
dataframe

    output$sales_table = DT::renderDataTable({
      sales_df
     })
    output$search_value <- renderText({input$search_input})
  }
)

我已经包含了我一直在尝试的代码。我使用grepl函数来匹配产品类别描述中的单词。理想情况下，该应用将遍历整个数据框（最终数据集将具有一百万行），并返回其中产品类别描述包含至少一个用户搜索词的行。我不确定什么是最好，最省时的方法。

由于我是新来的人，我不确定描述我遇到的问题的最佳和最清晰的方法，因此我可以在需要时添加更多信息。任何建议，将不胜感激。谢谢。

Answer 1

通过将选项search$regex设置为TRUE，可以在搜索输入中使用正则表达式：

datatable(iris[c(1,2,51,52,101,102),], 
          options = 
            list(
              search = list(regex = TRUE)
            )
)

另一个解决方案（点击“返回”以运行搜索）

js <- c(
  "function(settings){",
  "  var instance = settings.oInstance;",
  "  var table = instance.api();",
  "  var input = instance.parent().find('.dataTables_filter input');",
  "  input.off('keyup search input').on('keypress', function(e){",
  "    if(e.which == 13){",
  "      var keywords = input.val().split(' '), filter ='';",
  "      for(var i=0; i<keywords.length; i++){",
  "        filter = (filter !== '') ? filter + '|' + keywords[i] : keywords[i];",
  "      }",
  "      table.search(filter, true, false).draw();",
  "    }",
  "  });",
  "}"
)


datatable(iris[c(1,2,51,52,101,102),], 
          options = 
            list(initComplete = JS(js)
          )
)

Rshiny：通过多个用户输入过滤Datatable文本列的行

1 个答案: