I have added a custom form on the checkout page with the checkout_index_index.xml file, below is the code for that.
<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" layout="1column" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
<body>
<referenceBlock name="checkout.root">
<arguments>
<argument name="jsLayout" xsi:type="array">
<item name="components" xsi:type="array">
<item name="checkout" xsi:type="array">
<item name="children" xsi:type="array">
<item name="steps" xsi:type="array">
<item name="children" xsi:type="array">
<item name="shipping-step" xsi:type="array">
<item name="children" xsi:type="array">
<item name="shippingAddress" xsi:type="array">
<item name="children" xsi:type="array">
<item name="before-form" xsi:type="array">
<item name="children" xsi:type="array">
<!-- new form -->
<item name="custom-checkout-form-container" xsi:type="array">
<!--links to our js file in step 1-->
<item name="component" xsi:type="string">Magecomp_Checkoutcustomform/js/view/custom-checkout-form</item>
<item name="provider" xsi:type="string">checkoutProvider</item>
<item name="config" xsi:type="array">
<!--links to our html file in step 2-->
<item name="template" xsi:type="string">Magecomp_Checkoutcustomform/custom-checkout-form</item>
</item>
<!-- new element -->
<item name="children" xsi:type="array">
<item name="custom-checkout-form-fieldset" xsi:type="array">
<item name="component" xsi:type="string">uiComponent</item>
<item name="displayArea" xsi:type="string">custom-checkout-form-fields</item>
<item name="children" xsi:type="array">
<item name="customfield1" xsi:type="array">
<item name="validation" xsi:type="array">
<item name="validate-no-empty" xsi:type="boolean">true</item>
<item name="max-words" xsi:type="number">5</item>
</item>
<item name="component" xsi:type="string">Magento_Ui/js/form/element/abstract</item>
<item name="config" xsi:type="array">
<item name="customScope" xsi:type="string">customCheckoutForm</item>
<item name="template" xsi:type="string">ui/form/field</item>
<item name="elementTmpl" xsi:type="string">ui/form/element/input</item>
</item>
<item name="provider" xsi:type="string">checkoutProvider</item>
<item name="dataScope" xsi:type="string">customCheckoutForm.customfield1</item>
<item name="label" xsi:type="string">Custom Field 1</item>
<item name="sortOrder" xsi:type="string">1</item>
<item name="visible" xsi:type="boolean">true</item>
</item>
</item>
</item>
</item>
</item>
</item>
</item>
</item>
</item>
</item>
</item>
</item>
</item>
</item>
</item>
</item>
</argument>
</arguments>
</referenceBlock>
</body>
</page>for validation, I have added the "validation" item node for the required field. but still, the form is submitted and the order is placed without entering these fields. so how can I add validation for the customs form on the checkout page? Thanks in advance.
