Join together and display multiple values for a parameter

The code below will display all the instances of the parameter 'title' joined together with a comma. For purposes of the result, assume that this code is on a page that was called from a page with the following code:

<form method="post" action="?title=M.D.">
    <input type="text" name="title" value="Ph.D." />
    <input type="submit" value="Test" />
</form>

Code

web_request->param('title', ', ')

Result

Ph.D., M.D.

---

To test whether a parameter has been submitted:

Use the [web_request->param] method. The code below will test whether the parameter 'rhino' is submitted.

Code

<form method="post" action="?title=M.D.">
    <input type="text" name="title" value="Ph.D." />
    <input type="submit" value="Test" />
</form>

[web_request->param('rhino', false)===void]

Result

true

---

To return a staticarray of the values for a named parameter:

Use the [web_request->param] method. The code below will return all submitted values for the named parameter 'title' as a staticarray. This may be especially useful for checkboxes and multiple select form inputs.

Code

<form method="post" action="?title=M.D.">
    <input type="text" name="title" value="Ph.D." />
    <input type="submit" value="Test" />
</form>
[web_request->param('title', false)]

Result

staticarray(Ph.D., M.D.)