simple ajax example for begginers using tornado?

aliane abdelouahab

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Jul 12, 2013, 2:40:30 PM7/12/13

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hi

i wanted to learn that ajax technology, and digged to youtube, the tutorial i watched is http://www.youtube.com/watch?v=Q1xJ4m7fPSg

but the first line he wrote was: php :(

is there any tutorial for beginners? my philoshopy is only about forms and binding them to a requesthandler by a post method, what about ajax?

Andrew Grigorev

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Jul 12, 2013, 2:46:00 PM7/12/13

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AJAX is all about JS. You can use it with regular HTTP POST requests,
forms and request handlers. See http://api.jquery.com/jQuery.ajax/ for
examples. You can find its usage with tornado in the chat demo in
tornado repository.

12.07.2013 22:40, aliane abdelouahab пишет:

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Russ Weeks

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Jul 12, 2013, 2:52:21 PM7/12/13

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I agree with Andrew. It's fine (and important) to learn about the theory of AJAX and XMLHttpRequest from eg. Wikipedia. But when you actually want to build something with AJAX, definitely use a library like jQuery.

On Fri, Jul 12, 2013 at 11:46 AM, Andrew Grigorev <and...@ei-grad.ru> wrote:

AJAX is all about JS. You can use it with regular HTTP POST requests, forms and request handlers. See http://api.jquery.com/jQuery.ajax/ for examples. You can find its usage with tornado in the chat demo in tornado repository.

12.07.2013 22:40, aliane abdelouahab пишет:

hi
i wanted to learn that ajax technology, and digged to youtube, the tutorial i watched is http://www.youtube.com/watch?v=Q1xJ4m7fPSg
but the first line he wrote was: php :(
is there any tutorial for beginners? my philoshopy is only about forms and binding them to a requesthandler by a post method, what about ajax?
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aliane abdelouahab

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Jul 12, 2013, 2:52:29 PM7/12/13

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the post will refresh the whole page, ajax will refresh only that field, but i dont know how to break that page, in php codes, they add content types, which is handled by tornado directly, and tornado chat uses jquery, i just want simple example using the basic XHR :(

Andrew Grigorev

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Jul 12, 2013, 3:00:16 PM7/12/13

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AJAX wouldn't refresh anything by itself. It is just about how to execute HTTP request from JavaScript, and get its result in the JavaScript, without need to reload current web page. If you interested, you can find complete XMLHttpRequest documentation here - http://www.w3.org/TR/XMLHttpRequest/.

12.07.2013 22:52, aliane abdelouahab пишет:

aliane abdelouahab

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Jul 12, 2013, 4:06:21 PM7/12/13

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but how do tornado understand it, what i want is just a hello world version ajax (write something and seeks in a list if it exists or not), this will be my bootstrap.

aliane abdelouahab

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Jul 12, 2013, 5:05:47 PM7/12/13

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it seems that i finally get the idea, when i found the 'server' it doesent mean the webserver (software) but they mean the machine itself, just tried this code, and it worked without the need or tornado? tornado will only serve the files and has no work about treating the content?

here is the code:

<html>

<head>

function loadXMLDoc(url)

{

if (window.XMLHttpRequest)

{

xmlhttp = new XMLHttpRequest();

}

xmlhttp.open("GET",url,false);

xmlhttp.send(null);

document.getElementById('test').innerHTML=xmlhttp.response-Text;

}

</script>

</head>

<body>

<h2>Click to let AJAX change this text</h2>

</div>

<button type="button" onclick="loadXMLDoc('test1.txt')">Click Me</button>

<button type="button" onclick="loadXMLDoc('test2.txt')">Click Me</button>

</body>

</html>

Andrew Grigorev

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Jul 12, 2013, 5:26:57 PM7/12/13

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yes

13.07.2013 01:05, aliane abdelouahab пишет:

aliane abdelouahab

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Jul 12, 2013, 5:37:30 PM7/12/13

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so i just place my url in the URL and it will send only that fragment to the server without sending the whole html?

aliane abdelouahab

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Jul 12, 2013, 5:47:50 PM7/12/13

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here is the full example:

ajax.html

<html>

<head>

function loadXMLDoc(url)

{

if (window.XMLHttpRequest)

{

xmlhttp = new XMLHttpRequest();

}

xmlhttp.open("GET",url,false);

xmlhttp.send(null);

document.getElementById('test').innerHTML=xmlhttp.responseText;

}

</script>

</head>

<body>

<h2>Click to let AJAX change this text</h2>

</div>

<button type="button" onclick="loadXMLDoc('/aja')">Click Me</button>

<button type="button" onclick="loadXMLDoc('/ajb')">Click Me</button>

</body>

</html>

handlers.py

class Ajax(BaseHandler):

def get(self):

self.render("ajax.html")

class Aja(BaseHandler):

@tornado.web.authenticated

@tornado.web.asynchronous

@tornado.gen.engine

def get(self):

self.write(str(range(1, 10)))

self.finish()

class Ajb(BaseHandler):

@tornado.web.authenticated

@tornado.web.asynchronous

@tornado.gen.engine

def get(self):

self.write(str(range(10, 20)))

self.finish()

of course, the urls:

(r"/ajax", handlers.Ajax),

(r"/aja", handlers.Aja),

(r"/ajb", handlers.Ajb),

thank you again :)

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