input Call Blur()

[zxylllll]

<input id="chat_input" onkeydown="chat_input_enter" type="text" value="" />
I want the input field to lose focus when pressing Enter. Calling element->Blur(); doesn't work. Then I tried making another element gain focus to force the input to lose focus, but that didn't work either. Why is that?

if (value.empty())
{
	auto context = element->GetContext();
	if (context) {
		auto root = context->GetRootElement();
		if (root) {
			root->Focus();
		}
	}
	//element->Blur();
	//Rml::ElementFormControlInput* input = dynamic_cast<Rml::ElementFormControlInput*>(element);
} 

[mikke89]

Hi.

So the focus element is a document-specific value. The root element is not part of any document, thus it cannot be focused. If you instead focus the element's owning document, I expect it to work.

I'm not sure why the Blur() method is not working for you. We do use it some places like in the visual tests, and there it seems to behave as expected. If you post a complete example of it not working then I could hopefully provide some more details.

[zxylllll]

Yes, I found the cause. It was a bug in my code. But I have another issue: I want the UI to refresh after pressing F11 in the window, so I wrote a reload function.

void RmlUi::reload_all_documents()
{
	printf("Programmatically reloading UI documents...\n");
	
	if (!rml_context) {
		printf("Error: RmlUi context is null\n");
		return;
	}
	
	struct DocumentInfo {
		std::string path;
		std::string id;
		bool was_visible;
	};
	std::vector<DocumentInfo> doc_infos;
	
	for (const auto& [id, doc] : documents) {
		if (doc) {
			DocumentInfo info;
			info.id = id;
			info.path = doc->GetSourceURL();
			info.was_visible = doc->IsVisible();
			doc_infos.push_back(info);
		}
	}
	
	for (auto& [id, doc] : documents) {
		if (doc) {
			doc->Close();
		}
	}
	documents.clear();
	
	if (rml_context) {
		rml_context->Update();
	}
	
	for (const auto& info : doc_infos) {
		Rml::ElementDocument* new_doc = rml_context->LoadDocument(info.path);
		if (new_doc) {
			new_doc->SetId(info.id);
			documents[info.id] = new_doc;
			if (info.was_visible) {
				new_doc->Show();
			}
			printf("Reloaded document: %s (ID: %s)\n", info.path.c_str(), info.id.c_str());
		} else {
			printf("Failed to reload document: %s (ID: %s)\n", info.path.c_str(), info.id.c_str());
		}
	}
	
	if (rml_context) {
		rml_context->Update();
	}
	
	printf("UI reload completed. Reloaded %zu documents.\n", doc_infos.size());
}

When there are bound events in the RML code, rml_context->LoadDocument throws a 0xC0000005 exception.

[mikke89]

It's hard to say just based on this. It sounds like you have some some form of memory corruption going on. Try compiling with address sanitizer or running with another memory sanitizer tool to try to figure out where the actual issue occurs. There are some further hints here you could take a look at: https://mikke89.github.io/RmlUiDoc/pages/cpp_manual/troubleshooting.html

This one in particular:

When you call ElementDocument::Close(), make sure event listeners attached to any element of the document are kept alive until the next call to Context::Update() or Rml::Shutdown().

I don't know what your documents member owns exactly, but if it is tied to the lifetime of your event listeners, then try to move it below the context update.

[zxylllll]

Thanks, the reason for the error is quite simple—it's still an issue with my code. When calling RegisterEventListenerInstancer, the parameter was set as a local variable, causing it to be released!