# Customize the Form

## Customize the Form from the Dashboard

You can now customize the form from [Cotter's Dashboard](https://dev.cotter.app/) > Project > Design.

![](/files/-MXtivfWqAyXySH8FbeI)

**Customizable Features that are not available in the Dashboard:**

* [Add Additional fields](/sdk-reference/web/web-sdk-verify-email-phone/older-sdk/advanced-customization.md#additional-fields)
* [Advanced Styling](/sdk-reference/web/web-sdk-verify-email-phone/styling.md)

## Advanced Configuration Reference

You can use our advanced config to have more functionality:

#### Usage:

```javascript
var cotter = new Cotter(config); // 👈 Put the config in here

  cotter
    .signInWithLink()
    .showEmailForm()
    .then(payload => {})
    .catch(err => {});
```

#### Config:

Here's an example of a complete configuration:

```javascript
var config = {
  // Required Basic Configuration
  ApiKeyID: "<your-API-KEY-ID>",
  Type: "PHONE", // EMAIL or PHONE
  ContainerID: "cotter-container-signup",
  IdentifierField: "phone",

  // Change Country Code
  CountryCode: ["+62"], // IT HAS TO BE AN ARRAY

  // Styling
  ButtonBackgroundColor: "#000000",
  ButtonTextColor: "#ffffff",
  ButtonText: "Sign Up Now",
  ButtonBorderColor: "#D2D3FF", // don't specify for no border

  // Adding fields
  AdditionalFields: [
    {
      label: "Full Name",
      name: "name",
      placeholder: "Enter your full name"
    }
  ],

  // Intercepting before authentication is processed
  OnBegin: payload => {
    if (payload.identifier != "+12345678910") {
      return "Phone Number is not allowed";
    }
    return null;
  },
  
  // Add WhatsApp option to send verification code
  // (only for type = PHONE)
  // ################################################
  // # 👈Please read the section about WhatsApp 👈 #
  // #       to comply with WhatsApp's Policy       # 
  // ################################################
  PhoneChannels: ["SMS", "WHATSAPP"], // default = ["SMS"]
  
  // WhatsApp Button Styling
  ButtonWAText: "Continue with",
  ButtonWATextSubtitle:
    "Tell your customer that you'll be sending the verification code via WhatsApp",
  ButtonWABackgroundColor: "#128C7E",
  ButtonWABorderColor: "#075E54",
  ButtonWATextColor: "#ffffff",
  ButtonWALogoColor: "white",
};
```

## **Description**

| Field Name                                                                             | Description                                                                                                                                                                                                        | Required |
| -------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | -------- |
| ApiKeyID                                                                               | your `API_KEY_ID`                                                                                                                                                                                                  | Y        |
| Type                                                                                   | `"EMAIL"` or `"PHONE"`                                                                                                                                                                                             | Y        |
| ContainerID                                                                            | `id` of the `<div>` where you want to serve Cotter Form.                                                                                                                                                           | Y        |
| ButtonBackgroundColor                                                                  | Button background color. Use HEX format (e.g. `#000000`)                                                                                                                                                           | N        |
| ButtonTextColor                                                                        | Button text color. Use HEX format (e.g. `#FFFFFF`)                                                                                                                                                                 | N        |
| ButtonText                                                                             | Button text. Default is "Sign Up Without Password"                                                                                                                                                                 | N        |
| [AdditionalFields](/sdk-reference/web/web-sdk-verify-email-phone.md#additional-fields) | Additional fields that you want to include in the JSON obj. Check the specs for [Additional Fields Object](/sdk-reference/web/web-sdk-verify-email-phone.md#additional-fields) below                               | N        |
| IdentifierField                                                                        | Field name for the identifier to include in the JSON obj. For example, if you want to include the phone number in the JSON obj under key `"phone"`, then fill in `IdentifierField = "phone"`                       | Y        |
| [OnBegin](/sdk-reference/web/web-sdk-verify-email-phone.md#onbegin)                    | A function that will be called before the signup process begin. Check the specs for [OnBegin](/sdk-reference/web/web-sdk-verify-email-phone.md#onbegin) below                                                      | N        |
| [CountryCode](/sdk-reference/web/web-sdk-verify-email-phone.md#countrycode)            | **An Array** of country code options for the user                                                                                                                                                                  | N        |
| PhoneChannels                                                                          | **An Array** of channels to send verification code to your users. Default value is `["SMS"].`Available values are `SMS` and `WHATSAPP.` For example, to allow both SMS and WhatsApp, specify `["SMS", "WHATSAPP"]` | N        |

### **Additional Fields**

The additional fields will be used to generate more `<input>` fields for your users. The format is as following:

```javascript
var config = {
  ...
  AdditionalFields: [
          {
            label: "Full Name",
            name: "name",
            placeholder: "Enter your full name"
          },
          {
            label: "Address",
            name: "address",
            placeholder: "Enter your address"
          },
          {
            label: "Prefilled Info",
            name: "prefilled",
            type: "hidden", // type can be "hidden", "text" or "number"
            initial_value: "autofill value"
          }
        ],
}
```

> Available types: `hidden`, `text`, `number`

This will be sent to you to the [RedirectURL](/sdk-reference/web/web-sdk-verify-email-phone.md#redirecturl) endpoint above as part of the JSON object. For example, with the fields above, you'll get a JSON object like the following.

**JSON Object to be sent to `RedirectURL`:**

```javascript
{
  "token": {...},
  [IdentifierField]: "+12345678910",

  // Additional Fields
  "name": "Hello World",
  "address": "Street Address",
  "prefilled": "autofill value"
  ...
}
```

### **OnBegin**

This function will be invoked before the Signup/Login process. You will receive the following payload as a parameter to your function

**Payload passed into your OnBegin function**

```javascript
var payload = {
  identifier: "+12345678910",
  identifier_type: "PHONE",
  device_type: "BROWSER",
  device_name: "Chrome ..."
};
```

You can do a check against the `identifier` here before the form is submitted.

If you include `OnBegin` key, you have to either **return an error string**, or **return null** if you want to continue the authentication process:

**A. If you want to continue submission:**

```javascript
return null;
```

**B. If you want to stop submission with an error:**

```javascript
return "Your error message";
```

Example:

```javascript
 OnBegin: payload => {
  if (payload.identifier != "+12345678910") {
    return "Phone Number is not allowed";
  }
  // No error, continue submission
  return null;
},
```

###

### **CountryCode**

The default value is `CountryCode: ["+1"];`

{% hint style="warning" %}
If you specify this, **you have to use an array** even though you only need 1 country code!
{% endhint %}

ex. with 1 country code

```javascript
CountryCode: ["+1"];
```

ex. with 2 country codes

```javascript
CountryCode: ["+62", "+91"];
```

{% hint style="success" %}
Our SMS and WhatsApp messaging works **worldwide**!
{% endhint %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.cotter.app/sdk-reference/web/web-sdk-verify-email-phone/customize-the-form.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.