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In Magento 2 templates I've found some ko statements such as

<form class="form form-shipping-address" id="co-shipping-form" data-bind="attr: {'data-hasrequired': $t('* Required Fields')}">
<!-- ko foreach: getRegion('before-fields') -->
<!-- ko template: getTemplate() --><!-- /ko -->
<!--/ko-->
<div id="shipping-new-address-form" class="fieldset address">
    <!-- ko foreach: getRegion('additional-fieldsets') -->
    <!-- ko template: getTemplate() --><!-- /ko -->
    <!--/ko-->
    <!-- ko if: (isCustomerLoggedIn) -->
    <div class="field choice" data-bind="visible: !isFormInline">
        <input type="checkbox" class="checkbox" id="shipping-save-in-address-book" data-bind="checked: saveInAddressBook" />
        <label class="label" for="shipping-save-in-address-book">
            <span data-bind="i18n: 'Save in address book'"></span>
        </label>
    </div>
    <!-- /ko -->
</div>

I understood it has something to do with knockoutjs but I'm not used of this library at all.

  • how does Magento process such statements ?
  • how to use those statements in a custom module ?
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That's a pretty wide open question, but from what I understand of Knockout, those comments aren't processed by Magento at all -- they're Knockout syntax for creating container-less statements. i.e. it's the knockout javascript library that processes them.

Probably best to get started with the official docs until someone writes up a tutorial on how Magento integrates with Knockout (similar to my RequireJS article)

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