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hiddenField()

The hiddenField() function generates a hidden <input type="hidden"> tag for a given model object and property. It’s commonly used to store identifiers or other values that need to persist across form submissions without being visible to the user. Note: Pass any additional arguments like class, rel, and id, and the generated tag will also include those values as HTML attributes.

Name	Type	Required	Default	Description
objectName	any	Yes		The variable name of the object to build the form control for.
property	string	Yes		The name of the property to use in the form control.
association	string	No		The name of the association that the property is located on. Used for building nested forms that work with nested properties. If you are building a form with deep nesting, simply pass in a list to the nested object, and Wheels will figure it out.
position	string	No		The position used when referencing a hasMany relationship in the association argument. Used for building nested forms that work with nested properties. If you are building a form with deep nestings, simply pass in a list of positions, and Wheels will figure it out.
encode	boolean	No	true	Encode URL parameters using `EncodeForURL()`. Please note that this does not make the string safe for placement in HTML attributes, for that you need to wrap the result in `EncodeForHtmlAttribute()` or use `linkTo()`, `startFormTag()` etc instead.

1. Basic usage with object and property
<!--- Hidden field for user.id --->
#hiddenField(objectName="user", property="id")#

// Generates something like:
// <input id="user-id" name="user.id" type="hidden" value="123">

2. Adding extra HTML attributes
#hiddenField(
    objectName="user",
    property="sessionToken",
    id="custom-token",
    class="hidden-tracker"
)#

// <input id="custom-token" name="user.sessionToken" type="hidden" value="abc123" class="hidden-tracker">

3. Nested association (hasOne or belongsTo)
#hiddenField(
    objectName="order",
    property="id",
    association="customer"
)#

// If an order has a customer, this binds the hidden field to order.customer.id.

4. Nested hasMany with position
#hiddenField(
    objectName="order",
    property="id",
    association="items",
    position="1"
)#

// Binds to the id of the second item in the order’s items collection.