Struct DomStringMap 

pub struct DomStringMap<'a, Ext: 'static> { /* private fields */ }

Read-side view of el.dataset. Borrows the element via NodeRef; lookup converts a camelCase key to a data-* attribute name on the fly.

Implementations

impl<'a, Ext: 'static> DomStringMap<'a, Ext>

pub fn new(node: NodeRef<'a, Ext>) -> Self

Construct from a borrowed NodeRef. Used by the NodeRef::dataset() integration (M4b step 19) and tests.

pub fn get(&self, key: &str) -> Option<&'a str>

Read the data-* attribute corresponding to key. Returns None when no such attribute is set. DOM el.dataset[key].

pub fn contains_key(&self, key: &str) -> bool

true iff a data-* attribute corresponding to key exists on the element. DOM key in el.dataset.

pub fn iter(&self) -> impl Iterator<Item = (String, &'a str)> + 'a

Iterate (key, value) pairs over every data-* attribute that round-trips through the camelCase ↔ kebab-case rule. Attributes like data-Foo (uppercase) or data- (empty key) are skipped because they aren’t valid HTML data attributes and don’t have a JS-side key.

pub fn len(&self) -> usize

Count of valid data-* attributes (entries that would appear in Self::iter).

pub fn is_empty(&self) -> bool

true iff Self::len is zero.