Enum AttributeValue 

#[non_exhaustive]
pub enum AttributeValue {
    Absent,
    Empty,
    PromotedStr {
        value: &'static &'static str,
        context: HtmlContext,
    },
    StaticStr {
        value: &'static str,
        context: HtmlContext,
    },
    String {
        value: String,
        context: HtmlContext,
    },
}

An attribute value captured from any AttributeValueViewParts value.

Values retain their HTML context for escaping when rendered. Reusing a captured value as an attribute value or class entry preserves its output.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Absent

Marks the attribute as not rendered.

An absent value keeps its key in an Attributes collection, so it still replaces an earlier value when collections are merged, but the attribute is not rendered.

Empty

A present value that renders nothing, like a true boolean attribute (disabled="").

PromotedStr

A static string held by reference.

Fields

value: &'static &'static str

context: HtmlContext

StaticStr

A static string.

Fields

value: &'static str

context: HtmlContext

String

An owned string.

Fields

value: String

context: HtmlContext

Implementations

impl AttributeValue

pub fn absent() -> Self

Returns the value that marks its attribute as absent.

pub fn is_present(&self) -> bool

Returns whether the attribute holding this value should be rendered.

Trait Implementations

impl AttributeValueViewParts for AttributeValue

fn attribute_present(&self) -> bool

Returns whether the containing attribute should be rendered.

fn into_view_parts(self, _cx: &Cx, parts: &mut PartsWriter<'_>)

Appends this attribute value to the view being built.

impl AttributeValueViewParts for &AttributeValue

fn attribute_present(&self) -> bool

Returns whether the containing attribute should be rendered.

fn into_view_parts(self, _cx: &Cx, parts: &mut PartsWriter<'_>)

Appends this attribute value to the view being built.

impl ClassViewParts for AttributeValue

A captured attribute value spliced in as a single class list entry, such as one taken from an Attributes collection with remove. An absent value is skipped.

fn is_present(&self) -> bool

Returns whether this value contributes to the class list.

fn into_view_parts(self, _cx: &Cx, parts: &mut PartsWriter<'_>)

Appends this value to the class list being built.

impl ClassViewParts for &AttributeValue

fn is_present(&self) -> bool

Returns whether this value contributes to the class list.

fn into_view_parts(self, _cx: &Cx, parts: &mut PartsWriter<'_>)

Appends this value to the class list being built.

impl Clone for AttributeValue

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for AttributeValue

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for AttributeValue

fn default() -> Self

Returns the “default value” for a type.