currency Field Type¶

The currency type is a subset of the choice type that allows the user to select from a large list of 3-letter ISO 4217 currencies.

Unlike the choice type, you don’t need to specify a choices or choice_list option as the field type automatically uses a large list of currencies. You can specify either of these options manually, but then you should just use the choice type directly.

Rendered as	can be various tags (see Select Tag, Checkboxes or Radio Buttons)
Overridden Options	choices
Inherited options	from the choice type empty_value error_bubbling expanded multiple preferred_choices from the form type data disabled empty_data label label_attr mapped read_only required
Parent type	choice
Class	`CurrencyType`

Overridden Options¶

choices¶

default: Symfony\Component\Intl\Intl::getCurrencyBundle()->getCurrencyNames()

The choices option defaults to all currencies.

Inherited Options¶

These options inherit from the choice type:

empty_value¶

2.3 新版功能: Since Symfony 2.3, empty values are also supported if the expanded option is set to true.

type: string or Boolean

This option determines whether or not a special “empty” option (e.g. “Choose an option”) will appear at the top of a select widget. This option only applies if the multiple option is set to false.

Add an empty value with “Choose an option” as the text:

$builder->add('states', 'choice', array(
    'empty_value' => 'Choose an option',
));

Guarantee that no “empty” value option is displayed:

$builder->add('states', 'choice', array(
    'empty_value' => false,
));

If you leave the empty_value option unset, then a blank (with no text) option will automatically be added if and only if the required option is false:

// a blank (with no text) option will be added
$builder->add('states', 'choice', array(
    'required' => false,
));

error_bubbling¶

type: Boolean default: false unless the form is compound

If true, any errors for this field will be passed to the parent field or form. For example, if set to true on a normal field, any errors for that field will be attached to the main form, not to the specific field.

expanded¶

type: Boolean default: false

If set to true, radio buttons or checkboxes will be rendered (depending on the multiple value). If false, a select element will be rendered.

multiple¶

type: Boolean default: false

If true, the user will be able to select multiple options (as opposed to choosing just one option). Depending on the value of the expanded option, this will render either a select tag or checkboxes if true and a select tag or radio buttons if false. The returned value will be an array.

preferred_choices¶

type: array default: array()

If this option is specified, then a sub-set of all of the options will be moved to the top of the select menu. The following would move the “Baz” option to the top, with a visual separator between it and the rest of the options:

$builder->add('foo_choices', 'choice', array(
    'choices' => array('foo' => 'Foo', 'bar' => 'Bar', 'baz' => 'Baz'),
    'preferred_choices' => array('baz'),
));

Note that preferred choices are only meaningful when rendering as a select element (i.e. expanded is false). The preferred choices and normal choices are separated visually by a set of dotted lines (i.e. -------------------). This can be customized when rendering the field:

Twig

{{ form_widget(form.foo_choices, { 'separator': '=====' }) }}

PHP

<?php echo $view['form']->widget($form['foo_choices'], array('separator' => '=====')) ?>

These options inherit from the form type:

data¶

type: mixed default: Defaults to field of the underlying object (if there is one)

When you create a form, each field initially displays the value of the corresponding property of the form’s domain object (if an object is bound to the form). If you want to override the initial value for the form or just an individual field, you can set it in the data option:

$builder->add('token', 'hidden', array(
    'data' => 'abcdef',
));

注解

The default values for form fields are taken directly from the underlying data structure (e.g. an entity or an array). The data option overrides this default value.

disabled¶

2.1 新版功能: The disabled option was introduced in Symfony 2.1.

type: boolean default: false

If you don’t want a user to modify the value of a field, you can set the disabled option to true. Any submitted value will be ignored.

empty_data¶

type: mixed

The actual default value of this option depends on other field options:

If multiple is false and expanded is false, then '' (empty string);
Otherwise array() (empty array).

This option determines what value the field will return when the submitted value is empty.

But you can customize this to your needs. For example, if you want the gender choice field to be explicitly set to null when no value is selected, you can do it like this:

$builder->add('gender', 'choice', array(
    'choices' => array(
        'm' => 'Male',
        'f' => 'Female'
    ),
    'required'    => false,
    'empty_value' => 'Choose your gender',
    'empty_data'  => null
));

注解

If you want to set the empty_data option for your entire form class, see the cookbook article How to Configure empty Data for a Form Class.

label¶

type: string default: The label is “guessed” from the field name

Sets the label that will be used when rendering the field. Setting to false will suppress the label. The label can also be directly set inside the template:

Twig

{{ form_label(form.name, 'Your name') }}

PHP

echo $view['form']->label(
    $form['name'],
    'Your name'
);

label_attr¶

type: array default: array()

Sets the HTML attributes for the <label> element, which will be used when rendering the label for the field. It’s an associative array with HTML attribute as a key. This attributes can also be directly set inside the template:

Twig

{{ form_label(form.name, 'Your name', {'label_attr': {'class': 'CUSTOM_LABEL_CLASS'}}) }}

PHP

echo $view['form']->label(
    $form['name'],
    'Your name',
    array('label_attr' => array('class' => 'CUSTOM_LABEL_CLASS'))
);

mapped¶

type: boolean default: true

If you wish the field to be ignored when reading or writing to the object, you can set the mapped option to false.

read_only¶

type: Boolean default: false

If this option is true, the field will be rendered with the readonly attribute so that the field is not editable.

required¶

type: Boolean default: true

If true, an HTML5 required attribute will be rendered. The corresponding label will also render with a required class.

This is superficial and independent from validation. At best, if you let Symfony guess your field type, then the value of this option will be guessed from your validation information.

注解

The required option also affects how empty data for each field is handled. For more details, see the empty_data option.