/**
* Renders the whole field.
* This method will generate the label, error tag, input tag and hint tag (if any), and
* assemble them into HTML according to [[template]].
* @param string|callable $content the content within the field container.
* If null (not set), the default methods will be called to generate the label, error tag and input tag,
* and use them as the content.
* If a callable, it will be called to generate the content. The signature of the callable should be:
*
* ~~~
* function ($field) {
* return $html;
* }
* ~~~
*
* @return string the rendering result
*/
public function render($content = null)
{
if ($content === null) {
if (!isset($this->parts['{input}'])) {
$this->parts['{input}'] = Html::activeTextInput($this->model, $this->attribute, $this->inputOptions);
}
if (!isset($this->parts['{label}'])) {
$this->parts['{label}'] = Html::activeLabel($this->model, $this->attribute, $this->labelOptions);
}
if (!isset($this->parts['{error}'])) {
$this->parts['{error}'] = Html::error($this->model, $this->attribute, $this->errorOptions);
}
if (!isset($this->parts['{hint}'])) {
$this->parts['{hint}'] = Html::activeHint($this->model, $this->attribute, $this->hintOptions);
}
$content = strtr($this->template, $this->parts);
} elseif (!is_string($content)) {
$content = call_user_func($content, $this);
}
return $this->begin() . "\n" . $content . "\n" . $this->end();
}
