Custom iterator functions in SS3

[Uncle Cheese]

In SS 2.x, we could write custom iterator functions in our ViewableData objects.

function PosIsGreaterThan($num) {

return $this->getIterator()->Pos() > $num;

}

All of that stuff has been moved out of the ViewableData class and into SSViewer_Scope. I have no idea how to get to the SSViewer_Scope object from a ViewableData object. Any thoughts?

[Hamish Friedlander]

Hi,

Do you want to define PosIsGreaterThan, or call it from PHP code directly instead of from in a template?

If you mean call it from PHP code rather than a template, at the moment you can't - there isn't an API to do it. I was thinking about exposing the current scope - may even have discussed it on the list - but so far that hasn't happened.

But if you want to define PosIsGreaterThan, then do this:

class MyCustomIteratorFunctions implements TemplateIteratorProvider {

protected $iteratorPos;

protected $iteratorTotalItems;

public static function get_template_iterator_variables() {

return array('PosIsGreaterThan');

}

public function iteratorProperties($pos, $totalItems) {

$this->iteratorPos        = $pos;

$this->iteratorTotalItems = $totalItems;

}

function PosIsGreaterThan($num) {

return $this->iteratorPos > $num;

}

}

In 2.4 the concept of "object" and "member of collection" were merged together, messily. In 3 we've separated the concepts, hence <% loop %> and <% with %>, etc.

Hamish Friedlander | CTO
SilverStripe
http://www.silverstripe.com/

Phone: +64 4 978 7330 Extension 51
Skype: hamish.friedlander

Loft 503

Achilles House, 8 Commerce Street

Auckland City

New Zealand

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