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Merge pull request #1092 from lightpanda-io/nikneym/insert-adjacent-html
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Browse Source 
Support `Element#insertAdjacentHTML`
This commit is contained in:
Karl Seguin
2025-09-26 14:51:08 +08:00
committed by GitHub
parent 92226a8d06 f7b08a1160
commit f236a65a79
3 changed files with 117 additions and 1 deletions
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79
src/browser/dom/element.zig
View File

@@ -231,6 +231,85 @@ pub const Element = struct {
}
}
/// Parses the given `input` string and inserts its children to an element at given `position`.
/// https://developer.mozilla.org/en-US/docs/Web/API/Element/insertAdjacentHTML
///
/// TODO: Support for XML parsing and `TrustedHTML` instances.
pub fn _insertAdjacentHTML(self: *parser.Element, position: []const u8, input: []const u8) !void {
const self_node = parser.elementToNode(self);
const doc = parser.nodeOwnerDocument(self_node) orelse {
return parser.DOMError.WrongDocument;
};
// Parse the fragment.
// Should return error.Syntax on fail?
const fragment = try parser.documentParseFragmentFromStr(doc, input);
const fragment_node = parser.documentFragmentToNode(fragment);
// We always get it wrapped like so:
// <html><head></head><body>{ ... }</body></html>
// None of the following can be null.
const maybe_html = parser.nodeFirstChild(fragment_node);
std.debug.assert(maybe_html != null);
const html = maybe_html orelse return;
const maybe_body = parser.nodeLastChild(html);
std.debug.assert(maybe_body != null);
const body = maybe_body orelse return;
const children = try parser.nodeGetChildNodes(body);
// * `target_node` is `*Node` (where we actually insert),
// * `prev_node` is `?*Node`.
const target_node, const prev_node = blk: {
// Prefer case-sensitive match.
// "beforeend" was the most common case in my tests; we might adjust the order
// depending on which ones websites prefer most.
if (std.mem.eql(u8, position, "beforeend")) {
break :blk .{ self_node, null };
}
if (std.mem.eql(u8, position, "afterbegin")) {
// Get the first child; null indicates there are no children.
const first_child = parser.nodeFirstChild(self_node);
break :blk .{ self_node, first_child };
}
if (std.mem.eql(u8, position, "beforebegin")) {
// The node must have a parent node in order to use this variant.
const parent = parser.nodeParentNode(self_node) orelse return error.NoModificationAllowed;
// Parent cannot be Document.
// Should have checks for document_fragment and document_type?
if (parser.nodeType(parent) == .document) {
return error.NoModificationAllowed;
}
break :blk .{ parent, self_node };
}
if (std.mem.eql(u8, position, "afterend")) {
// The node must have a parent node in order to use this variant.
const parent = parser.nodeParentNode(self_node) orelse return error.NoModificationAllowed;
// Parent cannot be Document.
if (parser.nodeType(parent) == .document) {
return error.NoModificationAllowed;
}
// Get the next sibling or null; null indicates our node is the only one.
const sibling = parser.nodeNextSibling(self_node);
break :blk .{ parent, sibling };
}
// Thrown if:
// * position is not one of the four listed values.
// * The input is XML that is not well-formed.
return error.Syntax;
};
while (parser.nodeListItem(children, 0)) |child| {
_ = try parser.nodeInsertBefore(target_node, child, prev_node);
}
}
// The closest() method of the Element interface traverses the element and its parents (heading toward the document root) until it finds a node that matches the specified CSS selector.
// Returns the closest ancestor Element or itself, which matches the selectors. If there are no such element, null.
pub fn _closest(self: *parser.Element, selector: []const u8, page: *Page) !?*parser.Element {

2
src/browser/netsurf.zig
View File

@@ -1363,7 +1363,7 @@ pub fn nodeHasChildNodes(node: *Node) bool {
return res;
}
pub fn nodeInsertBefore(node: *Node, new_node: *Node, ref_node: *Node) !*Node {
pub fn nodeInsertBefore(node: *Node, new_node: *Node, ref_node: ?*Node) !*Node {
var res: ?*Node = null;
const err = nodeVtable(node).dom_node_insert_before.?(node, new_node, ref_node, &res);
try DOMErr(err);

37
src/tests/dom/element.html
View File

@@ -289,3 +289,40 @@
linkElement.rel = "stylesheet";
testing.expectEqual("stylesheet", linkElement.rel);
</script>
<!-- This structure will get mutated by insertAdjacentHTML test -->
<div id="insert-adjacent-html-outer-wrapper">
<div id="insert-adjacent-html-inner-wrapper">
<span></span>
<p>content</p>
</div>
</div>
<script id=insertAdjacentHTML>
// Insert "beforeend".
const wrapper = $("#insert-adjacent-html-inner-wrapper");
wrapper.insertAdjacentHTML("beforeend", "<h1>title</h1>");
let newElement = wrapper.lastElementChild;
testing.expectEqual("H1", newElement.tagName);
testing.expectEqual("title", newElement.innerText);
// Insert "beforebegin".
wrapper.insertAdjacentHTML("beforebegin", "<h2>small title</h2>");
newElement = wrapper.previousElementSibling;
testing.expectEqual("H2", newElement.tagName);
testing.expectEqual("small title", newElement.innerText);
// Insert "afterend".
wrapper.insertAdjacentHTML("afterend", "<div id=\"afterend\">after end</div>");
newElement = wrapper.nextElementSibling;
testing.expectEqual("DIV", newElement.tagName);
testing.expectEqual("after end", newElement.innerText);
testing.expectEqual("afterend", newElement.id);
// Insert "afterbegin".
wrapper.insertAdjacentHTML("afterbegin", "<div class=\"afterbegin\">after begin</div><yy></yy>");
newElement = wrapper.firstElementChild;
testing.expectEqual("DIV", newElement.tagName);
testing.expectEqual("after begin", newElement.innerText);
testing.expectEqual("afterbegin", newElement.className);
</script>