How can I set a topic variable using a HTML form button/elements?

Using SetVariablePlugin

The idea is that a POST to the save script will be monitored for any form elements named using the special prefixes mentioned in the documentation.

For example to save the equivalent of

    * Set SKIN = <user input>

Try the following:

<form action="%SCRIPTURLPATH{"save"}%/%WEB%/%TOPIC%" method="post"> 
  <input type="text" name="Set+SKIN"/> 
  <input type="submit" value="Set SKIN variable"/> 
</form>

It doesn't actually save a visible TML * Set = statement, instead an equivalent is stored in metadata (view it by appending ?raw=debug to the end of any topic URL) as a META:PREFERENCE

-- PaulHarvey - 11 Feb 2010