I'm setting up like a framework who use python in backend and html/css/js for frontend. My problem arrived during the loading of a QWebEngineView.
I search on the web how to establish a communication between python and javascript with QWebEngineView and I finally tried to use QtWebChannel. So I setted up everything, and everything worked good with communication between python and javascript, but the next issue appeared:
- First: i can't load javascript files directly in html with tags
<script> - Second: javascript loaded randomly, i tried to load javascript from python with
my_view.page().runJavascript(my_js)but it work one try on two. So sometimes jQuery load at the end, so an other part of the code doesn't work.
base.html:
<!DOCTYPE html>
<html lang="en">
<p id="log"></p>
<script src="qrc:///qtwebchannel/qwebchannel.js"></script>
<script>
window.onerror = function (error, url, line) {
console.error("ERROR: " + error.toString());
console.error("LINE: " + line.toString());
};
function load_app(){
new QWebChannel(qt.webChannelTransport, function (channel) {
window.app = channel.objects.app;
app.load_javascript(function(ret){
console.error("load javascript: " + ret)
});
});
}
load_app();
console.error("app loaded")
</script>
{{ application_html_content | safe }}
</html>
Another part of HTML:
{% extends 'base.html' %}
{% block content %}
<div class="row">
{% for user_id, user in user_dict.items() %}
<div id="{{ user_id }}" class="col s12 m6">
<div class="card blue-grey darken-1">
<div class="card-content white-text">
<span class="card-title">Visit Card</span>
<p>{{ user.name }}</p>
</div>
<div class="card-action">
<button id="btn_del_{{ user_id }}" class="btn blue waves-effect waves-light" onclick="delete_user({{ user_id }})">Delete</button>
<button class="btn blue waves-effect waves-light" onclick="detail_user({{ user_id }})">Detail</button>
</div>
</div>
</div>
{% endfor %}
</div>
{% endblock %}
{% block javascript %}
<script>
$(document).ready(function() {
app.request_result.connect(function (result) {
if ("delete" in result) {
user_id = result.delete;
var element = document.getElementById(user_id);
element.parentNode.removeChild(element)
}
});
console.error("ready");
});
function delete_user(user_id) {
document.getElementById("btn_del_" + user_id).innerHTML = "Waiting ...";
app.request('DemoHtml:Default:delete', user_id);
}
function detail_user(user_id) {
app.path('detail_user', {"user_id": user_id});
}
</script>
{% endblock %}
load_javascript function:
JQUERY = "vendor/Resources/js/jquery.js"
MATERIALIZE = "vendor/Resources/css/materialize/js/materialize.js"
@pyqtSlot(result=str)
def load_javascript(self):
with open(os.path.join(os.path.abspath(os.path.dirname(sys.argv[0])), self.MATERIALIZE), "r") as m_stream:
materialize_content = m_stream.read()
with open(os.path.join(os.path.abspath(os.path.dirname(sys.argv[0])), self.JQUERY), "r") as j_stream:
jquery_content = j_stream.read()
self.template_view.view.page().runJavaScript(jquery_content)
self.template_view.view.page().runJavaScript(materialize_content)
return "ok"
As you can see, normally I must see in log error:
- First: "load javascript: ok"
- Second: "app loaded"
but one time one two, this is reverse like:
- js: app loaded
- js: ERROR: Uncaught ReferenceError: $ is not defined
- js: LINE: 67
- js: Uncaught ReferenceError: $ is not defined
- js: load javascript: ok
Any help for this?
Thank you in advance!
