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[js] element.previousElementSibling

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This commit is contained in:
Witold Filipczyk 2021-05-16 15:42:01 +02:00
parent e4eaca040d
commit ed449aee6e
2 changed files with 85 additions and 0 deletions
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57
src/ecmascript/spidermonkey/element.c
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@ -73,6 +73,7 @@ static bool element_get_property_nextElementSibling(JSContext *ctx, unsigned int
static bool element_get_property_nextSibling(JSContext *ctx, unsigned int argc, JS::Value *vp);
static bool element_get_property_outerHtml(JSContext *ctx, unsigned int argc, JS::Value *vp);
static bool element_set_property_outerHtml(JSContext *ctx, unsigned int argc, JS::Value *vp);
static bool element_get_property_previousElementSibling(JSContext *ctx, unsigned int argc, JS::Value *vp);
static bool element_get_property_previousSibling(JSContext *ctx, unsigned int argc, JS::Value *vp);
static bool element_get_property_tagName(JSContext *ctx, unsigned int argc, JS::Value *vp);
static bool element_get_property_textContent(JSContext *ctx, unsigned int argc, JS::Value *vp);
@ -107,6 +108,7 @@ JSPropertySpec element_props[] = {
JS_PSG("nextElementSibling", element_get_property_nextElementSibling, JSPROP_ENUMERATE),
JS_PSG("nextSibling", element_get_property_nextSibling, JSPROP_ENUMERATE),
JS_PSGS("outerHTML", element_get_property_outerHtml, element_set_property_outerHtml, JSPROP_ENUMERATE),
JS_PSG("previousElementSibling", element_get_property_previousElementSibling, JSPROP_ENUMERATE),
JS_PSG("previousSibling", element_get_property_previousSibling, JSPROP_ENUMERATE),
JS_PSG("tagName", element_get_property_tagName, JSPROP_ENUMERATE),
JS_PSGS("textContent", element_get_property_textContent, element_set_property_textContent, JSPROP_ENUMERATE),
@ -662,6 +664,61 @@ element_get_property_nextSibling(JSContext *ctx, unsigned int argc, JS::Value *v
return true;
}
static bool
element_get_property_previousElementSibling(JSContext *ctx, unsigned int argc, JS::Value *vp)
{
JS::CallArgs args = CallArgsFromVp(argc, vp);
JS::RootedObject hobj(ctx, &args.thisv().toObject());
struct view_state *vs;
JSCompartment *comp = js::GetContextCompartment(ctx);
if (!comp) {
return false;
}
struct ecmascript_interpreter *interpreter = JS_GetCompartmentPrivate(comp);
/* This can be called if @obj if not itself an instance of the
* appropriate class but has one in its prototype chain. Fail
* such calls. */
if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
return false;
vs = interpreter->vs;
if (!vs) {
return false;
}
xmlpp::Element *el = JS_GetPrivate(hobj);
if (!el) {
args.rval().setNull();
return true;
}
xmlpp::Node *node = el;
while (true) {
node = node->get_previous_sibling();
if (!node) {
args.rval().setNull();
return true;
}
xmlpp::Element *next = dynamic_cast<const xmlpp::Element*>(node);
if (next) {
JSObject *elem = getElement(ctx, next);
args.rval().setObject(*elem);
return true;
}
}
args.rval().setNull();
return true;
}
static bool
element_get_property_previousSibling(JSContext *ctx, unsigned int argc, JS::Value *vp)
{

28
test/ecmascript/previousElementSibling.html Normal file
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@ -0,0 +1,28 @@
<!DOCTYPE html>
<html>
<body>
<p>Example list:</p>
<ul>
<li id="item1">Coffee (first li)</li>
<li id="item2">Tea (second li)</li>
</ul>
<p>Click the button to get the HTML content of the previous sibling of the second list item.</p>
<button onclick="myFunction()">Try it</button>
<p><strong>Note:</strong> The previousElementSibling property is not supported in IE8 and earlier versions.</p>
<p id="demo"></p>
<script>
function myFunction() {
var x = document.getElementById("item2").previousElementSibling.innerHTML;
alert(x);
}
</script>
</body>
</html>