# URL input

<figure><img src="/files/uMlAHlCTcEg5wsYqyaL8" alt=""><figcaption><p>URL input</p></figcaption></figure>

Use the `urlInput()` function to create URL inputs in your forms. It uses the HTML `<input type="url">` element which provides built-in URL validation.

***

## Basic usage

```javascript
import { Composer } from "formsmd";

const composer = new Composer({
  id: "my-form"
});

composer.urlInput("website", {
  question: "What is your website's URL?"
});
```

Generates the following Markdown-like syntax:

```
#! id = my-form

website = URLInput(
  | question = What is your website's URL?
)
```

### Required

Add the `required` parameter to make the field mandatory:

```javascript
composer.urlInput("website", {
  question: "What is your website's URL?",
  required: true
});
```

Generates the following Markdown-like syntax:

```
website* = URLInput(
  | question = What is your website's URL?
)
```

***

## Function overview

The following is the overview of the function:

```typescript
urlInput(name: string, params: object)
```

### Arguments

| Name     | Type     | Description                                                                                                                                                    |
| -------- | -------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `name`   | `string` | A unique name for your form field that you'll use to identify the user's response.<mark style="color:red;">\*</mark>                                           |
| `params` | `object` | An object containing all the configuration parameters for your URL input field (see the [parameters section](#parameters) below for the full list of options). |

{% hint style="danger" %} <mark style="color:red;">\*</mark>Avoid values for the `name` argument which may be the names of HTML attributes, such as `"name"`, `"role"`, `"id"`, etc. This is because by default, the form's template string is first sanitized using [DOMPurify](https://github.com/cure53/DOMPurify), and these values may be removed to prevent DOM clobbering.
{% endhint %}

***

## Parameters

### Shared parameters

These parameters are common to all form fields:

| Name                  | Type                                            | Description                                                                                                                                                                                                                                                                             |
| --------------------- | ----------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `question` (required) | `string`                                        | The main question or label of the form field.                                                                                                                                                                                                                                           |
| `required`            | `true` (`boolean`)                              | When set, the field becomes required.                                                                                                                                                                                                                                                   |
| `description`         | `string`                                        | Any extra information that the user may need to fill out the form. Appears right below the question.                                                                                                                                                                                    |
| `fieldSize`           | `"sm"`                                          | When set to `"sm"`, the font sizes of the question, description, and answer are made smaller.                                                                                                                                                                                           |
| `labelStyle`          | `"classic"`                                     | When set to `"classic"`, the question and description of the form field are made smaller.                                                                                                                                                                                               |
| `subfield`            | `true` (`boolean`)                              | When set, the question and description of the form field are made smaller. Functionally the same as setting `labelStyle` to `"classic"`.                                                                                                                                                |
| `disabled`            | `true` (`boolean`)                              | When set, the input is disabled.                                                                                                                                                                                                                                                        |
| `autofocus`           | `true` (`boolean`)                              | When set, the input will be automatically focused when the parent slide becomes active, or immediately after page load.                                                                                                                                                                 |
| `id`                  | `string`                                        | The `id` attribute of the form field container.                                                                                                                                                                                                                                         |
| `classNames`          | `string[]`                                      | The CSS class names of the form field. [See the available CSS utility classes](/content/css-utility-classes.md).                                                                                                                                                                        |
| `attrs`               | `Array<{ name: string, value: string }>`        | Other HTML attributes of the form field. Each attribute has a `name` and `value` property.                                                                                                                                                                                              |
| `displayCondition`    | `{ dependencies: string[], condition: string }` | Controls when the field is shown. The `dependencies` lists the fields to watch, and `condition` is the expression that must be true to show the field. The `condition` must be a valid [Nunjucks](https://mozilla.github.io/nunjucks/) expression. [See example](#conditional-display). |

### URL input specific parameters

| Name          | Type     | Description                                                                 |
| ------------- | -------- | --------------------------------------------------------------------------- |
| `placeholder` | `string` | Sets the `placeholder` attribute of the input.                              |
| `maxlength`   | `number` | If set, this becomes the maximum number of allowed characters in the input. |
| `pattern`     | `string` | If set, the input value must match the given pattern.                       |
| `value`       | `string` | If set, this becomes the default value of the input.                        |

***

## Examples

### URL input with custom placeholder

```javascript
composer.urlInput("blogUrl", {
  question: "What's your blog URL?",
  description: "Enter the full URL including https://",
  placeholder: "https://myblog.com",
  required: true
});
```

Generates the following Markdown-like syntax:

```
blogUrl* = URLInput(
  | question = What's your blog URL?
  | description = Enter the full URL including https://
  | placeholder = https://myblog.com
)
```

### URL input with pattern validation

```javascript
composer.urlInput("githubProfile", {
  question: "GitHub profile URL",
  description: "Please enter your GitHub profile URL",
  pattern: "https://github\\.com/[\\w-]+",
  required: true
});
```

Generates the following Markdown-like syntax:

```
githubProfile* = URLInput(
  | question = GitHub profile URL
  | description = Please enter your GitHub profile URL
  | pattern = https://github\.com/[\w-]+
)
```

### Styled URL input with custom attributes

Add CSS classes and other HTML attributes using the `classNames` and `attrs` parameters. Please note, these class names and attributes are added to the `<div>` or `<fieldset>` container that contains the actual input field(s).

```javascript
composer.urlInput("portfolioUrl", {
  question: "Portfolio URL",
  classNames: ["col-6", "xs:col-6"],
  attrs: [
    { name: "style", value: "font-size: 18px;" }
  ]
});
```

Generates the following Markdown-like syntax:

```
[.col-6 .xs:col-6 style="font-size: 18px;"]
portfolioUrl = URLInput(
  | question = Portfolio URL
)
```

Please [see the available CSS utility classes](/content/css-utility-classes.md).

### Conditional display

Conditionally show or hide a URL input field using the `displayCondition` parameter. It works as follows:

* `dependencies` lists the fields to watch.
* `condition` is the expression that must be true to show the field. This must be a valid [Nunjucks](https://mozilla.github.io/nunjucks/) expression.

For instance, in the example below, the portfolio URL input will only show up if the user indicates they have a portfolio website.

```javascript
composer.choiceInput("hasPortfolio", {
  question: "Do you have a portfolio website?",
  required: true,
  choices: ["Yes", "No"]
})

composer.urlInput("portfolioUrl", {
  question: "Portfolio website URL",
  displayCondition: {
    dependencies: ["hasPortfolio"],
    condition: "hasPortfolio == 'Yes'"
  }
});
```

Generates the following Markdown-like syntax:

```
hasPortfolio* = ChoiceInput(
  | question = Do you have a portfolio website?
  | choices = Yes, No
)

::: [{$ hasPortfolio $}]
{% if hasPortfolio == "Yes" %}
portfolioUrl = URLInput(
  | question = Portfolio website URL
)
{% endif %}
:::
```


---

# 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.forms.md/input-types/url-input.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.