There exist some Wiki Argument Variables that allow one to use some variables that are part of the tiki current instance. For example {{user}} will display the userid of the current user: . My first idea was to implement the same thing for to display the email id of the current user.

It is generally considered a bad idea to insert email addresses into wiki or web pages as spammers can scrape and use them. I believe this is why the idea is frowned upon. So thanks to Jonny's suggestion I came up with the following solution instead.

1. Add the following custom.php to your tiki language directory, mine is in lang/en/ or lang/en-uk/
   
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   get_user_email($user);
     //create smarty variable assign it the value of the current user's email address
     $smarty->assign('curremail', $email); }

2. To use the smarty variable
   1. using Smarty plugin
      
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      {SMARTY(name=>eval, var=>"{$curremail}")}{SMARTY}

   2. used in a smarty template
      
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      email id is {$curremail}

This is how I used it via smarty plugin and div plugin and jquery plugin to pre-fill an html form field which is within html plugin. It is shown here in three parts that must be within the same page. Extraneous information has been removed &/or replaced with blah or ....

• html
  
  {CODE(colors=bash)}

{HTML()}

Your E-mail address:
...

{HTML()}
{CODE}

• retrieve field value, assign it an id for use in jquery
  
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  {DIV(class=hidden, id=emailactual)}
   {SMARTY(name=>eval, var=>"{$curremail}")}{SMARTY}
  {DIV}

• insert the field value in the form
  
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  {JQ()}
  if (!$jq("#emailid").val()) { $jq("#emailid").val($("#emailactual").text()); 
  }
  {JQ}