How can we remove an attribute from the xml block in layout file in magento2?

Question

I need to remove the ttl attribute value from catalog.topnav block in default.xml file. I have overrided the file in custom path as follows:

Magento_Theme/layout/default.xml

<referenceBlock name="catalog.topnav">
   <attribute name="ttl" value="" />
</referenceBlock>

Original block is as follows:

 <block class="Magento\Theme\Block\Html\Topmenu" name="catalog.topnav" template="Magento_Theme::html/topmenu.phtml" ttl="3600" before="-">

Answer 1

I have overrided the file in custom path as follows:

Magento_Theme/layout/default.xml

<referenceBlock name="catalog.topnav" remove="true"/>
<referenceBlock name="store.menu">
    <block class="Magento\Theme\Block\Html\Topmenu" name="catalog.topnav.without.ttl" template="Magento_Theme::html/topmenu.phtml" before="-"/>
</referenceBlock>

and override also the

Magento_Theme/layout/print.xml

<referenceBlock name="catalog.topnav.without.ttl" remove="true"/>

maybe it works for you too.

Answer 2

late but it works for me

   <referenceBlock name="catalog.topnav">
        <action method="unsetData">
            <argument name="key" xsi:type="string">ttl</argument>
        </action>
    </referenceBlock>