当我尝试在表单中附加新元素时，Symfony2 表单在提交时变得无效

Question

我在表单中添加了一个按钮添加部分。当用户单击该按钮时，它会打开一个提示窗口。提示窗口询问部分 id 之后，它调用 ajax 以从数据库中获取部分数据并使用相应的字段创建部分表单然后我将该子表单（即部分表单）附加到现有表单。但是当我提交表单时，symfony 会抛出错误，该表单无效。所以基本上symfony表单不接受新创建的子表单附加到现有表单

这就是我在 symfony 控制器中向表单添加按钮的方式

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

    ))

在 twig 文件中，Jquery 将新字段附加到按钮单击上的现有表单

 $('#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']);

            }});
        });

但是当我提交表单时，它没有进入表单有效块

 if ('POST' === $request->getMethod()) {

        $form->handleRequest($request);

        if ($form->isValid()) {
        // not entering in this block
        }
        }

Answer 1

从 Symfony 2.6 开始，您可以通过将其添加到表单选项来消除此错误：

'allow_extra_fields' => true,

更多信息请见here