[skip ci] Update method signatures for PHP 7.1+ type hints

Replaces explicit class type hints with nullable and 'mixed' types in several method signatures to improve compatibility with PHP 7.1+ type hinting. Affects HtmlDoubleElement, Sidebar, TableTrait, HtmlInput, and DataTable classes.

Author: jcheron

Ajax/common/html/HtmlDoubleElement.php

@@ -151,7 +151,7 @@ public function asEditable(HtmlFormField $field, $asForm = false, $setValuePrope
 	 * {@inheritdoc}
 	 * @see \Ajax\common\html\BaseHtml::compile_once()
 	 */
-	protected function compile_once(\Ajax\JsUtils $js = NULL, &$view = NULL) {
+	protected function compile_once(?\Ajax\JsUtils $js = NULL, mixed &$view = NULL) {
 		if (! $this->_compiled && isset($this->_editableContent)) {
 			$this->wrap("", $this->_editableContent);
 		}

Ajax/semantic/components/Sidebar.php

@@ -14,7 +14,7 @@
  */
 class Sidebar extends SimpleSemExtComponent {
 
-	public function __construct(JsUtils $js = NULL) {
+	public function __construct(?JsUtils $js = NULL) {
 		parent::__construct($js);
 		$this->uiName = 'sidebar';
 	}

Ajax/semantic/html/collections/table/traits/TableTrait.php

@@ -120,7 +120,7 @@ public function getEventsScript() {
 		return $this->_self->getBsComponent()->getScript();
 	}
 
-	public function addEventsOnRun(JsUtils $js = NULL) {
+	public function addEventsOnRun(?JsUtils $js = NULL) {
 		$script = parent::addEventsOnRun($js);
 		$innerScript = $this->_self->getInnerScript();
 		if (! isset($innerScript)) {

Ajax/semantic/html/elements/HtmlInput.php

@@ -58,7 +58,7 @@ public function setTransparent() {
 		return $this->addToProperty("class", "transparent");
 	}
 
-	public function compile_once(\Ajax\JsUtils $js = NULL, &$view = NULL) {
+	public function compile_once(?\Ajax\JsUtils $js = NULL, mixed &$view = NULL) {
 		parent::compile_once($js, $view);
 		if (isset($this->content['file'])) {
 			$this->onCreate(Javascript::fileUploadBehavior($this->identifier));

Ajax/semantic/widgets/datatable/DataTable.php

@@ -330,7 +330,7 @@ protected function _generatePagination($table) {
 		$footer->addValues($this->_paginationToolbar);
 	}
 
-	protected function _associatePaginationBehavior(JsUtils $js = NULL, $offset = null) {
+	protected function _associatePaginationBehavior(?JsUtils $js = NULL, $offset = null) {
 		if (isset($this->_urls["refresh"])) {
 			$menu = $this->_pagination->getMenu();
 			if (isset($menu) && isset($js)) {
@@ -349,7 +349,7 @@ protected function _associatePaginationBehavior(JsUtils $js = NULL, $offset = nu
 		}
 	}
 
-	protected function _compileSearchFieldBehavior(JsUtils $js = NULL) {
+	protected function _compileSearchFieldBehavior(?JsUtils $js = NULL) {
 		if (isset($this->_searchField) && isset($js) && isset($this->_urls["refresh"])) {
 			$this->_searchField->postOn("change", $this->_urls["refresh"], "{'s':$(self).val(),'_model':'" . JString::doubleBackSlashes($this->_model) . "'}", "#" . $this->identifier . " tbody", [
 				"preventDefault" => false,
@@ -360,7 +360,7 @@ protected function _compileSearchFieldBehavior(JsUtils $js = NULL) {
 		}
 	}
 
-	protected function _associateSearchFieldBehavior(JsUtils $js = NULL, $offset = null) {}
+	protected function _associateSearchFieldBehavior(?JsUtils $js = NULL, $offset = null) {}
 
 	protected function _getFieldName($index) {
 		$fieldName = parent::_getFieldName($index);