如何在Magento 2中从自定义phtml提交表单

我想从我的自定义phtml向campaign->Index controller提交一个表单。这是我的表单

        <form action="<?php echo $this->getUrl("mastering/campaign")?>" method="post">     
        <?php foreach($campaignData as $campaign){?>  
        <input type="checkbox" value="<?php echo $campaign['id'];?>" id="<?php echo $campaign['id']?>" name="campaign" class="checkbox">
           <label for="<?php echo $campaign['id']?>">
           <?php echo $campaign['title'];?>               
           </label>
           <br> 
           <?php }?>
            <button type="submit">Submit</button>
           </form> 

如你所见，我的表格没有提交。我想我错过了什么。请帮忙

$data = $this->getRequest()->getPostValue("campaign");
$model = $this->obectManager->create('mastering/samplemodule/model/product');
$model->setData($data);
$model->save();