What happens when someone submits a form

What happens in that single second after someone clicks submit on your form? Most people never think about it. Form submission is invisible to your visitors, but everything to your systems. The moment someone clicks submit, a chain of events begins that most people never see. Your data is validating, encoding, traveling, being received, processed, and stored.

If something goes wrong in that second, you need to know where. This article walks through every step of the submission process so you understand what happens after the click.

What is form submission

Form submission is the process of collecting the data a visitor has entered into your form fields and sending that data to a destination for processing. The submission happens when a user clicks a submit button (or presses Enter on a text field), triggering an HTTP request that carries the visitor's answers to your server or a third-party service.

The form submission process includes several steps: data collection, encoding, transmission, validation, processing, and response. Each of these steps must complete successfully for the submission to work correctly.

How form submission works step by step

When a visitor hits submit, a specific sequence unfolds. Understanding each step helps you troubleshoot integration problems and set up automations correctly.

Step 1: The submit event triggers

When a user clicks the submit button or presses Enter on certain fields, the form generates a submit event. This event signals the browser to gather all the data that was entered into the form's fields and prepare it for transmission.

Step 2: Form data gets collected

The browser reads every field in your form (text inputs, dropdowns, checkboxes, file uploads, etc.) and extracts the values. Each field's data is paired with its name attribute, creating key-value pairs. For example, if you have a field named "email" with the value "jane@example.com", the browser records that as a pair.

If a field is empty or left blank, the form still collects it (some systems ignore empty fields, depending on how the form is configured).

Step 3: Data gets encoded

Before the data can travel over the internet, it needs to be translated into a format the web server understands. This is called encoding. The two most common encoding formats are:

URL-encoded (application/x-www-form-urlencoded): Field names and values are combined with equals signs and ampersands. For example: "name=Jane&email=jane@example.com&phone=555-0123". This is the default for most forms.

Multipart/form-data: Used when your form includes file uploads. This format allows both text and binary data (like images) to be sent together.

Step 4: Data travels to the server

The encoded form data is packaged into an HTTP request and sent to the location specified in your form's action attribute. If no action is specified, the form submits to the same page the form is on.

The HTTP request includes the method you specified: GET or POST. GET requests are visible in the URL (used for searches and filters). POST requests hide the data in the request body (used for sensitive information like passwords or payment details).

If your form is submitted over HTTPS (which all modern forms should be), the data is encrypted during transmission. This keeps the information safe from being intercepted.

Step 5: The server receives and validates the data

When your server receives the submission, it first checks whether the data is valid and safe. Validation might include:

Confirming required fields are not empty. Checking that email addresses look like real email addresses. Verifying file uploads are the correct type and size. Testing that numbers are actually numbers, not text.

Sanitization is the process of removing anything dangerous from the data (like malicious scripts). This protects your database and your systems from attacks.

Step 6: The server processes the data

After validation and sanitization, the server decides what to do with the data. Common actions include:

Store it in a database: The submission is saved so you can review it later or integrate it into other systems.

Trigger automations: The submission might automatically send an email confirmation, update a CRM, or trigger a webhook.

Generate a response: The server creates and sends back a response to the visitor's browser. This could be a success page, a redirect, or a confirmation message shown on the same page.

Step 7: The visitor sees confirmation

The final step is what the visitor experiences. This might be:

A success message displayed on the same page. A redirect to a thank-you page. A confirmation email sent to their inbox. A modal or popup confirming the submission went through.

This step is critical because visitors need to know their submission worked. Without clear feedback, they may submit the form multiple times thinking it did not go through.

What happens to your form data after submission

Once the submission completes, the data goes somewhere. Understanding where is essential for using form submissions effectively.

Your form data can be stored in multiple places at once. Most form builders save submissions in their own database by default (where you can view them in the admin dashboard). Simultaneously, the submission can be forwarded to external services like email marketing platforms, CRM systems, or custom applications through integrations and webhooks.

The flow looks like this: Form submission → Form builder captures data → Data is stored locally and forwarded to integrations → You can access the data from multiple platforms.

The role of form fields in submission

Not all form fields behave the same during submission. Understanding how each type works helps you design forms that capture the right data.

Text inputs, text areas, email fields: Submit their value exactly as entered.

Dropdowns and select fields: Submit the value of the selected option, not the display text (though these can be the same).

Checkboxes: Only submit a value if they are checked. Unchecked boxes send nothing.

Radio buttons: Submit the value of the selected option only.

File uploads: Submit the file itself, not just its name. The file is included in the multipart encoding mentioned earlier.

Hidden fields: Submit their value automatically without the visitor seeing them. These are useful for passing extra information alongside visible fields.

Errors that can happen during form submission

Sometimes forms do not submit successfully. Common issues include:

Network errors: If the internet connection drops while submitting, the data may not reach the server. The visitor should see an error message.

Server errors: If your server is down or overloaded, the submission cannot be processed. This typically results in a 500 error.

Validation failures: If required fields are empty or data does not match expected formats, the form should not submit at all. Good form design prevents this by checking before sending.

Timeout errors: If the submission takes too long (usually more than 30 seconds), the browser may cancel the request.

Misconfigured integrations: If your form is set up to send data to an external service but the connection is broken, the submission might succeed in your form builder but fail to reach the destination.

Form submission security considerations

Security matters at every stage of the submission process. Here are the critical points:

Always use HTTPS: Your form must be on a secure (HTTPS) page, not HTTP. This encrypts data in transit.

Validate on both sides: Validation should happen both in the browser (for user experience) and on the server (for security). Never trust client-side validation alone.

Sanitize all input: Remove or escape any characters that could be dangerous when stored or displayed.

Limit file uploads: If your form accepts files, restrict file types and sizes to prevent abuse.

Implement CSRF protection: Forms should include a CSRF token to prevent attackers from submitting fraudulent requests on behalf of users.

Store sensitive data safely: If your form collects passwords, payment information, or other sensitive data, that data should be encrypted at rest (stored encrypted in your database).

How WEMASY handles form submissions

WEMASY's forms tool manages the entire submission process for you. When a visitor submits a form on your WEMASY website, the submission is automatically captured and stored in your WEMASY account. From there, you can view submissions in your dashboard, export them as CSV, or connect integrations to forward the data to your CRM, email platform, or custom applications.

WEMASY handles all the technical complexity of validation, encoding, secure transmission, and storage. You focus on designing the form and setting up where the data goes. See what integrations are available in your WEMASY account or check the pricing page to learn what forms features are included in your plan.

Frequently asked questions