Trait SelectorSubject 

pub trait SelectorSubject: Sized {
    // Required methods
    fn local_name(&self) -> &str;
    fn attribute(&self, name: &str) -> Option<&str>;
    fn parent(&self) -> Option<Self>;
    fn nth_child_index(&self) -> usize;
    fn nth_of_type_index(&self) -> usize;

    // Provided methods
    fn has_id(&self, id: &str) -> bool { ... }
    fn has_class(&self, class: &str) -> bool { ... }
}

Available on crate features html and http only.

A read-only view of an element, providing exactly what the selector matcher needs. Implement it for your own tree to match selectors against it, or use the in-memory Dom.

Self is expected to be a cheap handle (e.g. an index into an arena), since parent returns it by value.

Attribute and tag names are matched ASCII case-insensitively (per HTML), while class names, ids and attribute values are case-sensitive by default. The name passed to attribute is already ASCII-lowercased.

Required Methods

fn local_name(&self) -> &str

The element’s tag name (any ASCII case).

fn attribute(&self, name: &str) -> Option<&str>

The value of the attribute with the given (ASCII-lowercased) name.

fn parent(&self) -> Option<Self>

The element’s parent, if any.

fn nth_child_index(&self) -> usize

The element’s 1-based position among all element siblings (for :nth-child). A root element returns 1.

fn nth_of_type_index(&self) -> usize

The element’s 1-based position among element siblings of the same type (for :nth-of-type). A root element returns 1.

Provided Methods

fn has_id(&self, id: &str) -> bool

Whether the element has the given (case-sensitive) id.

Defaults to an exact comparison against the id attribute.

fn has_class(&self, class: &str) -> bool

Whether the element has the given (case-sensitive) class.

Defaults to scanning the whitespace-separated class attribute.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl SelectorSubject for Element<'_>