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| META TOPICPARENT |
name="TWikiVariables" |
URLPARAM{"name"} -- get value of a URL parameter |
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<
< |
default="..." |
Default value in case parameter is empty or missing |
empty string |
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newline="$br" |
Convert newlines in textarea to other delimiters. Variables $br (for <br /> tag), $n (for newline) are expanded. Other text is encoded based on encode parameter. |
no conversion |
encode="off" |
Turn off encoding. See important security note below |
encode="safe" |
encode="quote" |
Escape double quotes with backslashes (\"), does not change other characters; required when feeding URL parameters into other TWiki variables. This encoding does not protect against cross-site scripting. |
encode="safe" |
encode="moderate" |
Encode special characters into HTML entities for moderate cross-site scripting protection: "<", ">", single quote (') and double quote (") are encoded. Useful to allow TWiki variables in comment boxes. |
encode="safe" |
encode="safe" |
Encode special characters into HTML entities for cross-site scripting protection: "<", ">", "%", single quote (') and double quote (") are encoded. |
(this is the default) |
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<
< |
encode="entity" |
Encode special characters into HTML entities. See ENCODE for more details. |
encode="safe" |
encode="html" |
As encode="entity" except it also encodes newline (\n) and linefeed (\r) |
encode="safe" |
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>
> |
encode="entity" |
Encode special characters into HTML entities. See ENCODE for details. |
encode="safe" |
encode="html" |
Encode special characters into HTML entities. In addition to encode="entity", it also encodes space, newline (\n) and linefeed (\r). Useful to encode text properly in HTML input fields. |
encode="safe" |
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encode="url" |
Encode special characters for URL parameter use, like a double quote into %22 |
encode="safe" |
multiple="on"
multiple="[[$item]]" |
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" |
first element |
separator=", " |
Separator between multiple selections. Only relevant if multiple is specified |
"\n" (newline) |
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>
> |
format="..." |
Format the result. $value expands to the URL parameter. If multiple is specified, $value expands to the result of the concatenated items. |
"$value" |
default="..." |
Default value in case parameter is empty or missing. The format parameter is not applied. |
empty string |
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- Example:
%URLPARAM{"skin"}% returns print for a .../view/TWiki/VarURLPARAM?skin=print URL
-
 Notes:
- IMPORTANT: There is a risk that this variable can be misused for cross-site scripting (XSS) if the encoding is turned off. The
encode="safe" is the default, it provides a safe middle ground. The encode="entity" is more aggressive, but some TWiki applications might not work.
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<
< |
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- URL parameters passed into HTML form fields must be entity ENCODEd.
Example: <input type="text" name="address" value="%URLPARAM{ "address" encode="entity" }%" />
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>
> |
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- URL parameters passed into HTML form fields should be encoded as
"html".
Example: <input type="text" name="address" value="%URLPARAM{ "address" encode="html" }%" />
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- Double quotes in URL parameters must be escaped when passed into other TWiki variables.
Example: %SEARCH{ "%URLPARAM{ "search" encode="quotes" }%" noheader="on" }%
- When used in a template topic, this variable will be expanded when the template is used to create a new topic. See TWikiTemplates#TemplateTopicsVars for details.
- Watch out for TWiki internal parameters, such as
rev, skin, template, topic, web; they have a special meaning in TWiki. Common parameters and view script specific parameters are documented at TWikiScripts.
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