Javascript 当我试图在表单中添加新元素时，Symfony2表单在提交时无效

我在表单中添加了一个按钮Add部分。当用户单击该按钮时，将打开一个提示窗口。提示窗口要求获取节id之后，它进行ajax调用以从数据库获取节数据，并使用相应的字段创建节表单，然后我将该子表单（即节表单）附加到现有表单。但是当我提交表单时，symfony抛出了一个错误，即表单无效。所以symfony表单基本上不接受附加到现有表单的新创建的子表单

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这就是我在symfony controller中向窗体添加按钮的方式

 $formBuilder-> add('new_sections','hidden',array())
  ->add('add','button', array(
        'label' => 'Add Section',

    ))

---

在twig文件中，Jquery在单击按钮时将新字段追加到现有表单中

 $('#form_add').click(
        function(){
            var section_id = prompt("Please enter your Section ID");
            console.log(section_id);
            $.ajax({url: url, success: function(result){

                var new_section_form ='' +
                        '<div style="border-style: solid; margin-top: 15px; border-radius: 3px; border-width: 1px; padding: 10px;">'+
                        '<label class="required">'+result['section']['section_id']+'</label>'+
                '<div id="form_'+result['section']['section_id']+'" class="SectionForms">'+
                 '       <div><label for="form_'+result['section']['section_id']+'_weight'+result['section']['section_id']+'">Weight </label><input type="text" id="form_'+result['section']['section_id']+'_weight'+result['section']['section_id']+'" name="form['+result['section']['section_id']+'][weight'+result['section']['section_id']+']" value="0"></div>'+
                '<div><label for="form_'+result['section']['section_id']+'_label'+result['section']['section_id']+'" class="required">label </label><input type="text" id="form_'+result['section']['section_id']+'_label'+result['section']['section_id']+'" name="form['+result['section']['section_id']+'][label'+result['section']['section_id']+']" required="required" value="Text Description v2"></div>'+
                '<div><label for="form_'+result['section']['section_id']+'_active'+result['section']['section_id']+'" class="required">Active </label><input type="text" id="form_'+result['section']['section_id']+'_active'+result['section']['section_id']+'" name="form['+result['section']['section_id']+'][active'+result['section']['section_id']+']" required="required" value="1"></div>'+
                '<div><label for="form_'+result['section']['section_id']+'_link'+result['section']['section_id']+'">Link </label><input type="text" id="form_'+result['section']['section_id']+'_link'+result['section']['section_id']+'" name="form['+result['section']['section_id']+'][link'+result['section']['section_id']+']"></div>'+
                '<div><label for="form_'+result['section']['section_id']+'_events_max'+result['section']['section_id']+'">events_max </label><input type="text" id="form_'+result['section']['section_id']+'_events_max'+result['section']['section_id']+'" name="form['+result['section']['section_id']+'][events_max'+result['section']['section_id']+']"></div>'+
                '<div><label for="form_'+result['section']['section_id']+'_events_min'+result['section']['section_id']+'">events_min </label><input type="text" id="form_'+result['section']['section_id']+'_events_min'+result['section']['section_id']+'" name="form['+result['section']['section_id']+'][events_min'+result['section']['section_id']+']"></div>'+
                '<div><label for="form_'+result['section']['section_id']+'_module'+result['section']['section_id']+'">module</label><input type="text" id="form_'+result['section']['section_id']+'_module'+result['section']['section_id']+'" name="form['+result['section']['section_id']+'][module'+result['section']['section_id']+']"></div>'+
                '<div><label for="form_'+result['section']['section_id']+'_module_icon'+result['section']['section_id']+'">module_icon </label><input type="text" id="form_'+result['section']['section_id']+'_module_icon'+result['section']['section_id']+'" name="form['+result['section']['section_id']+'][module_icon'+result['section']['section_id']+']" value="icon_generic"></div>'+
                '<div><label for="form_'+result['section']['section_id']+'_module_id'+result['section']['section_id']+'">module_id </label><input type="text" id="form_'+result['section']['section_id']+'_module_id'+result['section']['section_id']+'" name="form['+result['section']['section_id']+'][module_id'+result['section']['section_id']+']"></div>'+
                '<div><label for="form_'+result['section']['section_id']+'_apicall'+result['section']['section_id']+'">apicall </label><input type="text" id="form_'+result['section']['section_id']+'_apicall'+result['section']['section_id']+'" name="form['+result['section']['section_id']+'][apicall'+result['section']['section_id']+']" value="1"></div>'+
                '<div><label for="form_'+result['section']['section_id']+'_template_static'+result['section']['section_id']+'">template_static </label><input type="text" id="form_'+result['section']['section_id']+'_template_static'+result['section']['section_id']+'" name="form['+result['section']['section_id']+'][template_static'+result['section']['section_id']+']"></div>'+

                '<input type="hidden" id="form_'+result['section']['section_id']+'_changed'+result['section']['section_id']+'" name="form['+result['section']['section_id']+'][changed'+result['section']['section_id']+']" class="changedField" value="2">'+
                 '       <div><button type="button" id="form_'+result['section']['section_id']+'_delete_'+result['section']['section_id']+'" name="form['+result['section']['section_id']+'][delete_'+result['section']['section_id']+']" class="btn-delete">Delete Section No. '+result['section']['section_id']+'</button></div>'+
                '</div>'+
                '</div>'


                $('.SectionForms').last().parent().after(new_section_form);
                $('#form_new_sections').val($('#form_new_sections').val()+" "+result['section']['section_id']);

            }});
        });

---

自Symfony 2.6以来，您可以通过将此项添加到表单选项来消除此错误：

'allow_extra_fields' => true,

---

有关更多信息，请参见

表单中是否隐藏了意外被替换的令牌字段？此表单在Symfony2中是否有验证，如果有，验证规则是什么？请尝试Form:：getErrorsAsString（）查看出现了什么问题。请发布与此问题相关的代码。这就是我在symfony controller$formBuilder->add（'new_Section'，'hidden'，array（））->add（'add'，'button'，array（'label'=>'add Section'，）中向表单添加按钮的方式在twig文件中，Jquery在单击按钮$（'#form_add'）时将新字段追加到现有表单。单击（function（）{var section_id=prompt（“请输入您的节id”）；$。ajax（{url:url，success:function（result）{var new_section_form=//一些html代码$（'.SectionForms'）.last（）.parent（）.after（new_section_form）；$（'#form_new_sections'）.val（$（'.#form_new_sections'）.val（）+“”+结果['section']['section_id']）；}）；首先，你应该在问题中发布你的代码，这样人们就不必猜测解决方案。其次，你可能只是没有允许添加集，但我使用的是Symfony 2.3。我建议你升级，这不是很难

'allow_extra_fields' => true,