我是 Symfony 的新手，我想做一些操作，这样我可以通过 Ajax 获取实体主题中所有元素的列表，但答案仍然是“未定义”这里的代码文本很强
\n\n视图
\n\n $(document).ready(function () {\n var $theme = $(\'#theme\');\n $theme.append(\'<option value="">Choisir un th\xc3\xa8me</option>\');\n $.ajax({\n type: \'post\',\n url: \'{{ path(\'web_site_liste_theme_cmb\') }}\',\n dataType: \'json\',\n beforeSend: function () {\n $(\'#themediv\').append(\'<div id="loading" style=" float: left; display: block;"><img src="{{ asset(\'bundles/BackBundle/img/loadingicon.gif\') }}"/></div>\');\n },\n success: function (json) {\n {#$(\'#theme\').append({{ dump(json)}});#}\n console.log(json.value);\n $.each(json, function (index, value) {\n\n //console.log(value);\n $(\'#theme\').append(\'<option value="\' + value.id + \'">\' + value.name + \'</option>\');\n $(\'#loading\').remove();\n });\n }\n });\n });\n控制器
\n\n public function ListeThemeAction(Request $request)\n{\n\n $em = …