How to call children in Magento 2 template knockout
Vinh Jacker | 03-17-2025
Today, I will introduce you to how to call children in Magento 2 template knockout via the steps. Let’s follow and do as the given instructions!
What is the knockout in Magento 2?
First of all, we also need to understand the responsibility of the Magento 2 knockout. The Knockout is considered as a javascript library that supports for Model-View-View-Model (MVVM) design pattern on the frontend of the Magento 2 store. You can see Knockout in Magento 2 on every page and particularly, the Knockout is used mostly on the checkout page. The knockout allows auto-updating the user interface quickly and easily when there is any change.
Now let’s go into details about calling children in Magento 2 template knockout.
Overview of calling children in Magento 2 template knockout
In Magento 2 template knockout, you can call the children only with the simple steps:
- Step 1: Create two children:
child_aandchild_bin the layout of the Magento 2 template - Step 2: Declare all children in the file
list.html
Step 1: Create two children: child_a and child_b in the layout of Magento 2 template
<?xml version="1.0"?>
<page layout='1column' xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd" >
<body>
<referenceContainer name="content">
<block class="Mageplaza\HelloWorld\Block\Customer\Lists" before="-" cacheable="false" template="customer/list.phtml">
<arguments>
<argument name="jsLayout" xsi:type="array">
<item name="components" xsi:type="array">
<item name="customer-list" xsi:type="array">
<item name="component" xsi:type="string">Mageplaza_HelloWorld/js/view/customer/list</item>
<item name="config" xsi:type="array">
<item name="template" xsi:type="string">Mageplaza_HelloWorld/customer/list</item>
</item>
<item name="children" xsi:type="array">
<item name="child_a" xsi:type="array">
<item name="sortOrder" xsi:type="string">2</item>
<item name="component" xsi:type="string">Mageplaza_HelloWorld/js/view/customer/list</item>
<item name="config" xsi:type="array">
<item name="template" xsi:type="string">Mageplaza_HelloWorld/customer/child_a</item>
</item>
</item>
<item name="child_b" xsi:type="array">
<item name="sortOrder" xsi:type="string">1</item>
<item name="component" xsi:type="string">Mageplaza_HelloWorld/js/view/customer/list</item>
<item name="config" xsi:type="array">
<item name="template" xsi:type="string">Mageplaza_HelloWorld/customer/child_b</item>
</item>
<item name="displayArea" xsi:type="string">child_b</item>
</item>
</item>
</item>
</item>
</argument>
</arguments>
</block>
</referenceContainer>
</body>
</page>
Step 2: Declare all children in the file list.html
You can declare all children in the file list.html at the same time with the following command:
<!– ko foreach: elems() –>
<!– ko template: getTemplate() –><!– /ko –>
<!– /ko –>
Or do for “child a” and “child b” separately as the following:
- Declare the “child a” in the file
list.htmlvia the code snippet:
<div data-bind="scope: requestChild('child_a')">
<!-- ko template: getTemplate() --><!-- /ko -->
</div>
- Then, declare the “child b” via displayArea in the file
list.htmlby the command below:
<!– ko foreach: getRegion(‘child_b’) –>
<!– ko template: getTemplate() –><!– /ko –>
<!– /ko –>
##Conclusion
That’s how you can call children in Magento 2 template knockout. I hope this tutorial is helpful for you. Don’t forget to share it with Magento friends to help them out!
Thanks for reading!
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Jacker is the Chief Technology Officer (CTO) at Mageplaza, bringing over 10 years of experience in Magento, Shopify, and other eCommerce platforms. With deep technical expertise, he has led numerous successful projects, optimizing and scaling online stores for global brands. Beyond his work in eCommerce development, he is passionate about running and swimming.
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