(tornado)how can I pass argument to server when a button is pressed?

Question

I'm new to python tornado.I'm now building a web site When I want to send an argument to server by pressing a button,I don't know how to catch it on tornado. How do I know which button was pressed ?

Answer 1

a simple ajax GET request with jquery can do the job :

class Application(tornado.web.Application):
    """Tornado web class. Create all the routes used by tornado_start"""

    def __init__(self):
        handlers = [
            (r"/", Index),
            (r"/explicit_action_url/", ActionHandler)
        ]
...

class ActionHandler(tornado.web.RequestHandler):
    def get(self):
        print("button click")


class Index(tornado.web.RequestHandler):
    def get(self):
        self.render("index.html")

and in your index.html

<button id="btn" type="button">click me</button>
<script src="http://code.jquery.com/jquery-1.10.1.min.js"></script>
<script>
    $("#btn").click(function () {
        $.ajax({
            type: 'GET',
            url: "/explicit_action_url/",
            success: function (data) {
                alert("success")
            }
        });
    });
</script>