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HTMLOptionElement.index
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c6192dc286
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5 changed files with 43 additions and 25 deletions
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@ -28,6 +28,7 @@ use crate::dom::window::Window;
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use dom_struct::dom_struct;
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use html5ever::{LocalName, Prefix, QualName};
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use std::cell::Cell;
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use std::convert::TryInto;
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use style::element_state::ElementState;
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use style::str::{split_html_space_chars, str_join};
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@ -127,6 +128,41 @@ impl HTMLOptionElement {
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select.ask_for_reset();
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}
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}
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// https://html.spec.whatwg.org/multipage/#concept-option-index
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fn index(&self) -> i32 {
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if let Some(parent) = self.upcast::<Node>().GetParentNode() {
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if let Some(select_parent) = parent.downcast::<HTMLSelectElement>() {
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// return index in parent select's list of options
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return self.index_in_select(select_parent);
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} else if parent.is::<HTMLOptGroupElement>() {
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if let Some(grandparent) = parent.GetParentNode() {
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if let Some(select_grandparent) = grandparent.downcast::<HTMLSelectElement>() {
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// return index in grandparent select's list of options
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return self.index_in_select(select_grandparent);
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}
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}
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}
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}
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// "If the option element is not in a list of options,
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// then the option element's index is zero."
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// self is neither a child of a select, nor a grandchild of a select
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// via an optgroup, so it is not in a list of options
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0
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}
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fn index_in_select(&self, select: &HTMLSelectElement) -> i32 {
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match select.list_of_options().position(|n| &*n == self) {
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Some(index) => index.try_into().unwrap_or(0),
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None => {
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// shouldn't happen but not worth a browser panic
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warn!(
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"HTMLOptionElement called index_in_select at a select that did not contain it"
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);
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0
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},
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}
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}
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}
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// FIXME(ajeffrey): Provide a way of buffering DOMStrings other than using Strings
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@ -225,6 +261,11 @@ impl HTMLOptionElementMethods for HTMLOptionElement {
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self.selectedness.set(selected);
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self.pick_if_selected_and_reset();
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}
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// https://html.spec.whatwg.org/multipage/#dom-option-index
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fn Index(&self) -> i32 {
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self.index()
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}
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}
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impl VirtualMethods for HTMLOptionElement {
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@ -102,7 +102,7 @@ impl HTMLSelectElement {
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}
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// https://html.spec.whatwg.org/multipage/#concept-select-option-list
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fn list_of_options(&self) -> impl Iterator<Item = DomRoot<HTMLOptionElement>> {
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pub fn list_of_options(&self) -> impl Iterator<Item = DomRoot<HTMLOptionElement>> {
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self.upcast::<Node>().children().flat_map(|node| {
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if node.is::<HTMLOptionElement>() {
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let node = DomRoot::downcast::<HTMLOptionElement>(node).unwrap();
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@ -22,5 +22,5 @@ interface HTMLOptionElement : HTMLElement {
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[CEReactions]
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attribute DOMString text;
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// readonly attribute long index;
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readonly attribute long index;
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};
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