root/com.raquo.domtypes.generic.codecs/Codec

Codec

trait Codec[ScalaType, DomType]

This trait represents a way to encode and decode HTML attribute or DOM property values.

It is needed because attributes encode all values as strings regardless of their type, and then there are also multiple ways to encode e.g. boolean values. Some attributes encode those as "true" / "false" strings, others as presence or absence of the element, and yet others use "yes" / "no" or "on" / "off" strings, and properties encode booleans as actual booleans.

Scala DOM Types hides all this mess from you using codecs. All those pseudo-boolean attributes would be simply Attr[Boolean](name, codec) in your code.

class Object

trait Matchable

class Any

trait AsIsCodec[T]

object BooleanAsIsCodec

object DoubleAsIsCodec

object IntAsIsCodec

object StringAsIsCodec

object BooleanAsAttrPresenceCodec

object BooleanAsOnOffStringCodec

object BooleanAsTrueFalseStringCodec

object BooleanAsYesNoStringCodec

object DoubleAsStringCodec

object IntAsStringCodec

object IterableAsCommaSeparatedStringCodec

object IterableAsSpaceSeparatedStringCodec

Value members

Abstract methods

Convert the result of a dom.Node.getAttribute call to appropriate Scala type.

Note: HTML Attributes are generally optional, and dom.Node.getAttribute will return null if an attribute is not defined on a given DOM node. However, this decoder is only intended for cases when the attribute is defined.

// @TODO Orly? What about boolean attrs? How do we distinguish that? What about props?

Convert desired attribute value to appropriate DOM type. The resulting value should be passed to dom.Node.setAttribute call, EXCEPT when resulting value is a null. In that case you should call dom.Node.removeAttribute instead.

We use null instead of Option here to reduce overhead in JS land. This method should not be called by end users anyway, it's the consuming library's job to call this method under the hood.