Caching Forms Improved in 5.0+

Forms and pages can be cached in a variety of ways. Here are 2 different solutions, depending on your caching approach.

User Guide:

Quick troubleshooting the most commonly reported issues with your form's appearance, behavior, or submission of the form on the front end.

Twig Template Caching

When using simple Craft Caching, you'll need to make sure that you are refreshing the CSRF token and the Freeform form hash. Here's how that may look inside your template:

{# Initialize the form #}
{% set form = freeform.form("myFormHandle") %}

{# Cached form comes here #}
{% cache %}
    {{ form.render }}
{% endcache %}

{# Script for updating the form's Hash and CSRF token loads after #}
<script>
    // Find the corresponding Form
    var form = document.querySelector('form');

    // Locate and update the Hash input
    var formHashInput = form.querySelector('input[name=formHash]');
    formHashInput.setAttribute('value', '{{ form.hash }}');

    // Locate and update the CSRF input
    var csrfInput = form.querySelector('input[name={{ craft.app.config.general.csrfTokenName|e('js') }}]');
    csrfInput.value = '{{ craft.app.request.csrfToken|e('js') }}';
</script>

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If using PHP Sessions or Database Tables for Freeform Session Context, be sure to include {% do form.registerContext %}:

{# Initialize the form #}
{% set form = freeform.form("myFormHandle") %}
{% do form.registerContext %}

{# Cached form comes here #}
...

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Static Page Caching / CDN / Blitz

Services like CloudFlare allow you to cache components of web pages like JS, CSS and images. But you can also cache entire web pages; the complete HTML of a page. They then distribute these cached copies of pages across their global network of data centers. This makes websites screaming fast. The Blitz Craft plugin is another way for static page caching.

There's one problem with full page caching though. Forms stop working after a while since their CSRF tokens expire. CSRF tokens are a way of cutting down on unwanted form submissions and assure that a given form actually belongs to a given website.

You can overcome this problem of expired CSRF tokens in Craft CMS with some simple javascript and a little Twig template code.

Create a separate Twig template to handle loading the refreshed tokens with the following code:

{% set form = freeform.form(craft.app.request.get('form')) %}
{{ {
    hash: form.hash,
    payload: form.payload,
    csrf: {
        name: craft.app.config.general.csrfTokenName,
        value: craft.app.request.csrfToken,
    }
}|json_encode|raw }}

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If using PHP Sessions or Database Tables for Freeform Session Context, be sure to include {% do form.registerContext %}:

{% set form = freeform.form(craft.app.request.get('form')) %}
{% do form.registerContext %}
{{ {
    hash: form.hash,
    csrf: {
        name: craft.app.config.general.csrfTokenName,
        value: craft.app.request.csrfToken,
    }
}|json_encode|raw }}

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Make sure routing to that template works correctly. For example, we often dedicate a directory inside the Craft templates directory named something like dynamic on our websites and place files in that directory that we know should never be cached by the CDN. The above template might be in a directory called dynamic with a filename of index.twig.

Set up a rule in CloudFlare or your preferred CDN that makes sure any URLs starting with dynamic are not cached. You can then aggressively cache all of your other site URLs.

Add the following JS snippet to your main .js file or to the bottom of all your web pages. Note that this snippet assumes you're already running jQuery. It uses AJAX to fetch the contents of https://yourwebsite.com/dynamic, which just returns a fresh CSRF token (and anything else you include). This is then replaced in the CSRF token field of all forms on the page.

{# Initialize the form #}
{% set form = freeform.form("myFormHandle") %}
{{ form.render }}

{# Load the jQuery library #}
<script src="https://code.jquery.com/jquery-3.4.1.min.js"></script>

{# The script for updating the form's hash, payload and CSRF token loads after #}
<script>
    $(function () {
        // Find the corresponding Form
        var form = document.querySelector('form');

        $.ajax({
            // Specify the form handle in the GET parameters
            // ! Make sure to change the `myFormHandle` to your specific form handle.
            url: '/dynamic?form=myFormHandle',
            type: 'get',
            dataType: 'json',
            success: function (response) {
                // Update the Form Hash
                form.querySelector('input[name=formHash]').value = response.hash;

                // Update the Payload if encrypted payloads are enabled
                form.querySelector('input[name=freeform_payload]').value = response.payload;

                // Locate and update the CSRF input
                var csrf = response.csrf;
                form.querySelector('input[name=' + csrf.name + ']').value = csrf.value;
            },
        });
    });
</script>

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Finished!

User Guide:

Using a form more than once in the same template? Be sure to specify the id parameter for the Form query in your template with unique values.

# Caching Forms Improved in 5.0+

User Guide:

# Twig Template Caching

# Static Page Caching / CDN / Blitz

User Guide:

Caching Forms Improved in 5.0+

Twig Template Caching

Static Page Caching / CDN / Blitz