Extract parameters from a form query string

Description

This function facilitates getting the parameter names and values from a URL that is an parameterized HTML query.

This is motivated by a function from Chris Davis and Delft University.

Usage

getFormParams(query, isURL = grepl("^(http|\?)", query))

Arguments

Value

A named character vector giving the parameter values The names are the parameter names.

Author(s)

Duncan Temple Lang

Examples

if(url.exists("http://www.omegahat.net/foo/bob.R")) {

  getFormParams("http://www.omegahat.net/foo/bob.R?xyz=1&abc=verylong")

  getFormParams("xyz=1&abc=verylong")
  getFormParams("xyz=1&abc=&on=true")
  getFormParams("xyz=1&abc=")
}

Results

R version 3.3.1 (2016-06-21) -- "Bug in Your Hair"
Copyright (C) 2016 The R Foundation for Statistical Computing
Platform: x86_64-pc-linux-gnu (64-bit)

R is free software and comes with ABSOLUTELY NO WARRANTY.
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Type 'license()' or 'licence()' for distribution details.

R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.

Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.

> library(RCurl)
Loading required package: bitops
> png(filename="/home/ddbj/snapshot/RGM3/R_CC/result/RCurl/getFormParams.Rd_%03d_medium.png", width=480, height=480)
> ### Name: getFormParams
> ### Title: Extract parameters from a form query string
> ### Aliases: getFormParams
> ### Keywords: programming interface
> 
> ### ** Examples
> 
> if(url.exists("http://www.omegahat.net/foo/bob.R")) {
+ 
+   getFormParams("http://www.omegahat.net/foo/bob.R?xyz=1&abc=verylong")
+ 
+   getFormParams("xyz=1&abc=verylong")
+   getFormParams("xyz=1&abc=&on=true")
+   getFormParams("xyz=1&abc=")
+ }
> 
> 
> 
> 
> 
> dev.off()
null device 
          1 
>