Magento 2: Add New Massaction in the Admin Grid

Now, You are thinking how we will overwrite the grid.php in Magento 2. Because some module has grid.php and some has not.
Now We are adding the one massaction in Sales_order Grid at admin side which has no grid.php for order.

1. Create the file sales_order_grid.xml in the path app\code\[Vendor Name]\[Module Name]\view\adminhtml\ui_component

2. Write the following code in the file.

<?xml version="1.0" encoding="UTF-8"?>
<listing xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Ui:etc/ui_configuration.xsd">
<container name="listing_top">
<massaction name="listing_massaction">
<action name="sendemail">
<argument name="data" xsi:type="array">
<item name="config" xsi:type="array">
<item name="type" xsi:type="string">sendemail</item>
<item name="label" xsi:type="string" translate="true">Send Email</item>
<item name="url" xsi:type="url" path="sales/order/sendemail"/>
</item>
</argument>
</action>
</massaction>
</container>
</listing>

<?xml version="1.0" encoding="UTF-8"?>

<item name="type" xsi:type="string">sendemail</item>

<item name="label" xsi:type="string" translate="true">Send Email</item>

</item>

</argument>

</action>

</massaction>

</container>

</listing>

So first the container tag correlate to the top part of the grid using the listing_top name

Then the massaction tag matches the mass action block.

The action tag is we will defined our new action item, we need to give it a name (same as the item id in Magento 1).

The argument tag is array of argument and we can see from the xsi:type attribute.

we need add item configuration array. In this item array tag, we add three item tags:

type: which matches the action tag name and give the unique code
label: It is the text which displayed in the massaction dropdown
url: which is the URL It will be redirected to when select this item
Now Refresh the order grid and check in Massaction.