Magento中如何在script标签内用Knockout绑定实现可缓存页面数据刷新？

Can You Use Knockout Bindings in the text/x-magento-init Script Tag? #

Short answer: No, that approach won’t work. Magento parses the text/x-magento-init script block when the page loads—before Knockout applies its bindings. The chatData().customerId reference won’t be evaluated as a Knockout observable; it’ll just be treated as a literal string, which your JS component can’t use.

The Cache-Friendly Solution with customer-data and Knockout #

To keep your page cacheable while accessing customer-specific data, you’ll need to leverage Magento’s customer-data library to fetch dynamic data asynchronously, rather than embedding it directly in the template. Here’s a step-by-step implementation:

1. Create a Custom customer-data Section

First, define a section to store your chat-related customer data (like customerId). This lets Magento cache the page while serving personalized data via AJAX/localStorage.

Create app/code/MyModule/Chat/etc/frontend/section.xml:

<?xml version="1.0"?>
<section xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Customer:etc/sections.xsd">
    <group name="chat_data" class="MyModule\Chat\CustomerData\ChatData"/>
</section>

Then create the data provider class app/code/MyModule/Chat/CustomerData/ChatData.php:

<?php
namespace MyModule\Chat\CustomerData;

use Magento\Customer\CustomerData\SectionSourceInterface;
use Magento\Customer\Model\Session as CustomerSession;

class ChatData implements SectionSourceInterface
{
    protected $customerSession;

    public function __construct(CustomerSession $customerSession)
    {
        $this->customerSession = $customerSession;
    }

    public function getSectionData()
    {
        return [
            'customerId' => $this->customerSession->getCustomerId() ?: null,
        ];
    }
}

2. Update Your Template

Remove the dynamic PHP output from your template. Instead, initialize your JS component without hardcoded customer data:

<!-- Optional: Add a Knockout scope if you need to render customer-specific UI elements -->
<div data-bind="scope: 'chatData'">
    <span data-bind="text: 'Chatting as Customer ID: ' + chatData().customerId"></span>
</div>

<script type="text/x-magento-init">
{
    "*": {
        "MyModule/js/chat": {},
        "Magento_Ui/js/core/app": {
            "components": {
                "chatData": {
                    "component": "Magento_Customer/js/view/customer-data",
                    "sectionName": "chat_data"
                }
            }
        }
    }
}
</script>

3. Modify Your JS Component to Fetch Data

Update MyModule/js/chat.js to pull the customerId from the customer-data section:

define([
    'ko',
    'Magento_Customer/js/customer-data'
], function(ko, customerData) {
    return function(config) {
        // Fetch the chat_data section
        const chatData = customerData.get('chat_data');

        // Handle asynchronous data loading
        chatData.subscribe(function(newData) {
            const customerId = newData.customerId;
            if (customerId) {
                // Initialize your chat functionality here
                console.log('Initializing chat for customer:', customerId);
            }
        });

        // Access initial data if already available
        const initialCustomerId = chatData().customerId;
        if (initialCustomerId) {
            console.log('Initial customer ID:', initialCustomerId);
        }
    };
});

Why This Works for Caching #

• Your template is now static (no dynamic PHP output), so Magento can cache it fully.
• Customer-specific data is loaded asynchronously via customer-data, which uses localStorage/sessionStorage to persist data and only fetches fresh data when necessary.
• Knockout bindings will automatically update any UI elements when the customer-data section loads or changes.

内容的提问来源于stack exchange，提问作者strangerpixel