Forms & HTML

#Introduction

Winter provides various helpful functions with the Html facade, useful for dealing with HTML and forms. While most of the examples will use the PHP language all of these features translate directly to Twig markup with a simple conversion.

// PHP
<?= Form::open(..) ?>

// Twig
{{ form_open(...) }}

As you can see above, in Twig all functions prefixed with form_ will bind directly to the Form facade and provide access to the methods using snake_case. See the markup guide for more information on using the form helper in the frontend.

#Opening a form

Forms can be opened with the Form::open method that passes an array of attributes as the first argument:

<?= Form::open(['url' => 'foo/bar']) ?>
    //
<?= Form::close() ?>

By default, a POST method will be assumed, however, you are free to specify another method:

Form::open(['url' => 'foo/bar', 'method' => 'put'])

NOTE: Since HTML forms only support POST and GET, PUT and DELETE methods will be spoofed by automatically adding a _method hidden field to your form.

You may pass in regular HTML attributes as well:

Form::open(['url' => 'foo/bar', 'class' => 'pretty-form'])

If your form is going to accept file uploads, add a files option to your array:

Form::open(['url' => 'foo/bar', 'files' => true])

You may also open forms that point to handler methods in your page or components:

Form::open(['request' => 'onSave'])

#AJAX enabled forms

Likewise, AJAX enabled forms can be opened using the Form::ajax method where the first argument is the handler method name:

Form::ajax('onSave')

The second argument of Form::ajax should contain the attributes:

Form::ajax('onSave', ['confirm' => 'Are you sure?'])

You can also pass partials to update as another array:

Form::ajax('onSave', ['update' => [
        'control-panel' => '#controlPanel',
        'layout/sidebar' => '#layoutSidebar'
    ]
])

NOTE: Most data attributes from the AJAX framework are available here by dropping the data-request- prefix.

#Form tokens

#CSRF protection

If you have protection enabled, using the Form::open method with POST, PUT or DELETE will automatically add a CSRF token to your forms as a hidden field. Alternatively, if you wish to generate the HTML for the hidden CSRF field, you may use the token method:

<?= Form::token() ?>

#Deferred binding session key

A session key used for deferred binding will be added to every form as a hidden field. If you want to generate this field manually, you may use the sessionKey method:

<?= Form::sessionKey() ?>

#Form model binding

#Opening a model form

You may want to populate a form based on the contents of a model. To do so, use the Form::model method:

<?= Form::model($user, ['id' => 'userForm']) ?>

Now when you generate a form element, like a text input, the model's value matching the field's name will automatically be set as the field value. So for example, for a text input named email, the user model's email attribute would be set as the value. If there is an item in the Session flash data matching the input name, that will take precedence over the model's value. The priority looks like this:

1. Session flash data (old input)
2. Explicitly passed value
3. Model attribute data
4. Existing postback value

This allows you to quickly build forms that not only bind to model values, but easily re-populate if there is a validation error on the server. You can manually access these values using Form::value:

<input type="text" name="name" value="<?= Form::value('name') ?>" />

You may pass a default value as the second argument:

<?= Form::value('name', 'John Travolta') ?>

NOTE: When using Form::model, be sure to close your form with Form::close!

#Labels

#Generating a label element

<?= Form::label('email', 'E-Mail Address') ?>

#Specifying extra HTML attributes

<?= Form::label('email', 'E-Mail Address', ['class' => 'awesome']) ?>

NOTE: After creating a label, any form element you create with a name matching the label name will automatically receive an ID matching the label name as well.

#Text fields

#Generating A Text Input

<?= Form::text('username') ?>

#Specifying a default value

<?= Form::text('email', 'emailaddress@example.com') ?>

NOTE: The hidden and textarea methods have the same signature as the text method.

#Generating a password input

<?= Form::password('password') ?>

#Generating other inputs

<?= Form::email($name, $value = null, $attributes = []) ?>
<?= Form::file($name, $attributes = []) ?>

#Checkboxes and radio buttons

#Generating a checkbox or radio input

<?= Form::checkbox('name', 'value') ?>

<?= Form::radio('name', 'value') ?>

#Generating a checkbox or radio input that is checked

<?= Form::checkbox('name', 'value', true) ?>

<?= Form::radio('name', 'value', true) ?>

#Number

#Generating a number input

<?= Form::number('name', 'value') ?>

#File input

#Generating a file input

<?= Form::file('image') ?>

NOTE: The form must have been opened with the files option set to true.

#Drop-down lists

#Generating a drop-down list

<?= Form::select('size', ['L' => 'Large', 'S' => 'Small']) ?>

#Generating a drop-down list with selected default

<?= Form::select('size', ['L' => 'Large', 'S' => 'Small'], 'S') ?>

#Generating a grouped list

<?= Form::select('animal', [
    'Cats' => ['leopard' => 'Leopard'],
    'Dogs' => ['spaniel' => 'Spaniel'],
]) ?>

#Generating a drop-down list with a range

<?= Form::selectRange('number', 10, 20) ?>

#Generating a drop-down list with a range, selected value and blank option

<?= Form::selectRange('number', 10, 20, 2, ['emptyOption' => 'Choose...']) ?>

#Generating a list with month names

<?= Form::selectMonth('month') ?>

#Generating a list with month names, selected value and blank option

<?= Form::selectMonth('month', 2, ['emptyOption' => 'Choose month...']) ?>

#Buttons

#Generating a submit button

<?= Form::submit('Click Me!') ?>

NOTE: Need to create a button element? Try the button method. It has the same signature as submit.

#Custom macros

#Registering a form macro

It's easy to define your own custom Form class helpers called "macros". Here's how it works. First, simply register the macro with a given name and a Closure:

Form::macro('myField', function() {
    return '<input type="awesome">';
})

Now you can call your macro using its name:

#Calling A Custom Form Macro

<?= Form::myField() ?>