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"""

Communicate between Python and Javascript asynchronously using

inter-process messaging with the use of Javascript Bindings.

"""

from cefpython3 import cefpython as cef

g_htmlcode = """

<!doctype html>

<html>

<head>

<style>

body, html {

font-family: Arial;

font-size: 11pt;

}

</style>

function print(msg) {

document.getElementById("console").innerHTML += msg+"<br>";

}

function js_function(value) {

print("Value sent from Python: <b>"+value+"</b>");

py_function("I am a Javascript string #1", js_callback);

}

function js_callback(value, py_callback) {

print("Value sent from Python: <b>"+value+"</b>");

py_callback("I am a Javascript string #2");

}

</script>

</head>

<body>

<h1>Javascript Bindings</h1>

</body>

</html>

"""

def main():

cef.Initialize()

browser = cef.CreateBrowserSync(url=cef.GetDataUrl(g_htmlcode),

window_title="Javascript Bindings")

browser.SetClientHandler(LifespanHandler())

bindings = cef.JavascriptBindings()

bindings.SetFunction("py_function", py_function)

bindings.SetFunction("py_callback", py_callback)

browser.SetJavascriptBindings(bindings)

cef.MessageLoop()

del browser

cef.Shutdown()

def py_function(value, js_callback):

print("Value sent from Javascript: "+value)

js_callback.Call("I am a Python string #2", py_callback)

def py_callback(value):

print("Value sent from Javascript: "+value)

class LifespanHandler(object):

def OnLoadEnd(self, browser, **_):

browser.ExecuteFunction("js_function", "I am a Python string #1")

if __name__ == '__main__':

main()

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