Admin form redirect to dashboard - Magento2

Question

I am trying to store the value in custom table from admin form but it is always redirect to admin dashboard when I submit the form.

form page admin url: http://magentodev.gworks.mobi/magento2/admin/gworksrc/cancel/

<form action="/magento2/admin/gworksrc/cancel/" method="post">
 <input type="number" name="timeinterval" id="timeinterval" />
 <input type="submit" value="SUBMIT" id="timesubmit" />
</form>

I have tried with various type of action URL but nothing work

 action=<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>
 action=""
 action="<?php echo $this->getUrl('gworksrc/cancel/index'); ?>"

I found the same problem here, but it is syntax error but my form look simple I can't found any syntax error.

Thanks

Answer 1

You form must have form key to allow submit data. See formkey.phtml that used in core forms

Answer 2

Use this, I hope this is use full for you,

 action="<?php echo $this->getUrl('gworksrc/cancel'); ?>"

Answer 3

After put some efforts found solution.

In admin form you should need to add one hidden form input tag for carry session otherwise it redirects to admin dashboard page.

FormKey

<input name="form_key" type="hidden" value="<?php echo $block->updateCancelTime() ?>" />

Admin Form Look Like below

<form action="<?php echo $this->getUrl('gworksrc/cancel'); ?>" method="post">
 <input type="number" name="timeinterval" id="timeinterval" />
 <input type="submit" value="SUBMIT" id="timesubmit" />
 <input name="form_key" type="hidden" value="<?php echo $block->updateCancelTime() ?>" />
</form>

Admin Block for return form key

public function updateCancelTime(){

    return $this->formKey->getFormKey();
}

Reference: http://ka.lpe.sh/2012/09/13/magento-submitting-form-in-admin-redirects-to-dashboard/

above URL for Magento 1.X, I could covert into Magento 2