You are here: System » Macros » VarURLPARAM

URLPARAM{"name"} -- get URL or HTTP POST parameter value

  • Returns the value of the named parameter in the URL or HTTP POST request.
  • Syntax: %URLPARAM{"name"}%
  • Supported parameters:
    Parameter: Description: Default:
    "name" The name of a URL parameter required
    default="..." Default value, used if the parameter is not present empty string
    newline="<br />" Convert newlines in textarea to other delimiters no conversion
    Control how special characters are encoded
    off: No encoding. Avoid using this when possible. See the security warning below.
    entity: Encode special characters into HTML entities. See ENCODE for more details.
    safe: Encode characters '"<>% into HTML entities.
    url: Encode special characters for URL parameter use, like a double quote into %22
    quote: Escape double quotes with backslashes (\"), does not change other characters; required when feeding URL parameters into other macros.
    If set, gets all selected elements of a <select multiple="multiple"> tag. A format can be specified, with $item indicating the element, e.g. multiple="Option: $item" (also supports the standard FormatTokens) first element
    separator=", " Separator between multiple selections. Only relevant if multiple is specified "\n" (new line)
  • Example: %URLPARAM{"skin"}% returns print for a .../view/System/VarURLPARAM?skin=print URL
  • Notes:
    • URL parameters passed into HTML form fields must be entity ENCODEd.
    • Double quotes in URL parameters must be escaped when passed into other macros.
      Example: %SEARCH{ "%URLPARAM{ "search" encode="quote" }%" noheader="on" }%
    • When used in a template topic, this macro will be expanded when the template is used to create a new topic. See TemplateTopics for details.
    • Watch out for internal parameters, such as rev, skin, template, topic, web; they have a special meaning in Foswiki. Common parameters and view script specific parameters are documented at CommandAndCGIScripts.
    • If you have %URLPARAM{ in the value of a URL parameter, it will be modified to %<nop>URLPARAM{. This is to prevent an infinite loop during expansion.
    • Security warning! Using URLPARAM can easily be misused for cross-site scripting unless specific characters are entity encoded. By default URLPARAM encodes the characters '"<>% into HTML entities (same as encode="safe") which is relatively safe. The safest is to use encode="entity". When passing URLPARAM inside another macro always use double quotes ("") combined with using URLPARAM with encode="quote". For maximum security against cross-site scripting you are adviced to install the Foswiki:Extensions.SafeWikiPlugin.
  • Related: ENCODE, SEARCH, FormattedSearch, QUERYSTRING

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