TActivePanel allows the client-side panel contents to be updated during a
callback response using the {@link render} method.
Example: Assume $param is an instance of TCallbackEventParameter attached to
the OnCallback event of a TCallback with ID "callback1", and
"panel1" is the ID of a TActivePanel.
function callback1_requested($sender, $param)
{
$this->panel1->render($param->getNewWriter());
}
/**
* Ensure that the ID attribute is rendered and registers the javascript code
* for initializing the active control.
*/
protected function addAttributesToRender($writer)
{
parent::addAttributesToRender($writer);
$writer->addAttribute('id', $this->getClientID());
$options = TJavaScript::encode($this->getPostBackOptions());
$cs = $this->getPage()->getClientScript();
$code = "jQuery('#" . $this->getWidgetID() . "')." . $this->getWidget() . "(" . $options . ");";
$cs->registerEndScript(sprintf('%08X', crc32($code)), $code);
}
public function render($writer)
{
$this->registerClientScript();
parent::render($writer);
}
/**
* Overrides parent implementation. Callback {@link renderSelectables()} when
* page's IsCallback property is true.
*/
public function dataBind()
{
parent::dataBind();
if ($this->getPage()->getIsCallback()) {
$this->renderSelectables($this->getResponse()->createHtmlWriter());
}
}
/**
* Overrides parent implementation to just render the inner contents and avoid replacing the element itself when
* updating clientside, because replacing/removing will cause jqueryui to fire destroy on the original dialog extension.
* @param THtmlWriter html writer
*/
public function render($writer)
{
if ($this->getHasPreRendered() && $this->getActiveControl()->canUpdateClientSide()) {
parent::renderContents($writer);
$this->getPage()->getCallbackClient()->replaceContent($this, $writer, false);
} else {
parent::render($writer);
}
}
