error when creating a new container inside page.wrapper in magento2

Question 1

I'm trying to create a container inside page.wrapper to contain some custom blocks for my checkout page.

When I try the following in

app/design/frontend/MyTheme/myname/Magento_Theme/layout/checkout_index_index.xml

<body>
 <referenceContainer name="logo-container">
 <referenceBlock name="onestepcheckout-logo" remove="true" />
 </referenceContainer>
 <referenceContainer name="page.wrapper">
 <container name="footer-custom3" as="footer" after="main.content" label="Page Footer Container" htmlTag="footer" htmlClass="page-footer" >
 </container>
 </referenceContainer>
</body>

I get an error that

Exception #0 (Magento\Framework\Exception\LocalizedException): The 'footer-custom3' is not a child of 'page.wrapper'.

How do I make it a child of page.wrapper?

Also if I use it as a child of main.content as in the following it shows up

<referenceContainer name="main.content">
 <container name="footer-custom3" as="footer" after="main.content" label="Page Footer Container" htmlTag="footer" htmlClass="page-footer" >
 <block class="CleverSoft\Base\Block\Template" name="footer_block" template="html/footer.phtml">
 <block class="Magento\Store\Block\Switcher" name="footer.store_switcher" template="switch/stores.phtml" />
 <block class="Magento\Newsletter\Block\Subscribe" name="footer.newsletter" template="subscribe_footer.phtml" />
 </block>
 </container>
</referenceContainer>

Could someone explain to me why this is not working for page.wrapper?

Question 2

It's because of page.wrapper already has had a container with an alias is footer:

<referenceContainer name="page.wrapper">
 <container name="header.container" as="header_container" label="Page Header Container" htmlTag="header" htmlClass="page-header" before="main.content"/>
 <container name="page.top" as="page_top" label="After Page Header" after="header.container"/>
 <container name="footer-container" as="footer" before="before.body.end" label="Page Footer Container" htmlTag="footer" htmlClass="page-footer"/>
</referenceContainer>

When you try to add a container with the same alias footer, it is not added into list children of page.wrapper, it means when layout call getChildOffSet('footer') this will return footer-container instead of footer-custom3

You can read more detail in \Magento\Framework\Data\Structure::_getChildOffset and you can see the index of this

$index = array_search($childId, array_keys($this->getChildren($parentId)));

will be return false with $childId='footer-custom3'

I suggest you should change the alias to something else like as="footer-3" or your should remove footer-container before adding footer-custom3

<referenceContainer name="footer-container" remove="true"/>

If you see my answer is useful, please give me a vote

Thanks

Question 3

Nice, thanks for the detailed explanation. The error message was confusing me. I was thinking maybe I was missing something similar to magento 1 where you had to also echo $this->getChildHtml('block_name') in some cases but it was much simpler. Much appreciated

bachlee89 1,2876 silver badges10 bronze badges · Accepted Answer · 2018-12-20 15:18:22Z

It's because of page.wrapper already has had a container with an alias is footer:

<referenceContainer name="page.wrapper">
 <container name="header.container" as="header_container" label="Page Header Container" htmlTag="header" htmlClass="page-header" before="main.content"/>
 <container name="page.top" as="page_top" label="After Page Header" after="header.container"/>
 <container name="footer-container" as="footer" before="before.body.end" label="Page Footer Container" htmlTag="footer" htmlClass="page-footer"/>
</referenceContainer>

When you try to add a container with the same alias footer, it is not added into list children of page.wrapper, it means when layout call getChildOffSet('footer') this will return footer-container instead of footer-custom3

You can read more detail in \Magento\Framework\Data\Structure::_getChildOffset and you can see the index of this

$index = array_search($childId, array_keys($this->getChildren($parentId)));

will be return false with $childId='footer-custom3'

I suggest you should change the alias to something else like as="footer-3" or your should remove footer-container before adding footer-custom3

<referenceContainer name="footer-container" remove="true"/>

If you see my answer is useful, please give me a vote

Thanks

Nice, thanks for the detailed explanation. The error message was confusing me. I was thinking maybe I was missing something similar to magento 1 where you had to also echo $this->getChildHtml('block_name') in some cases but it was much simpler. Much appreciated

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