I'm trying for a super-simple example here, just to show Ajax working, and I
want to show how to return a structure filled with data results. I think I'm
taking the JSON approach here, and I suspect I'm just missing one step so my
JSON object is being returned as a text string instead of showing up as an
actual object on the other side. Any help is appreciated, thanks!
Here's my tiny web.py app:
import web, json
urls = ( # URLs mapped to handler classes
'/', 'home',
)
# Where the templates live:
render = web.template.render('templates/')
class home:
def GET(self):
return render.displaydata()
def POST(self):
input = web.input()
return json.dumps(dict( # Sort of seems to do the right thing...
txt = input.mod.lower(),
dat = "%.3f" % float(input.num)
))
if __name__ == '__main__':
app = web.application(urls, globals())
app.run()
Here's my coffeescript getdata.coffee which sends requests and displays
results:
getData = ->
$.post "/",
{ mod: $("#mod").val(), num: Math.random()*Math.PI * 2 },
(result) ->
$("#data").html(result).hide().fadeIn(500)
setTimeout (-> getData()), 2000 # Repeat every 2 seconds
$ ->
getData()
And here's the HTML page displaydata.html:
<!doctype html>
<html>
<head>
<title>Webpy, CoffeeScript and jQuery Ajax</title>
<script type="text/javascript" src="/static/jquery.js"></script>
<script type="text/javascript" src="/static/getdata.js"></script>
</head>
<body>
<center>
<input class="text" id="mod" value="X"
size="10" style="font-size:2em"/>
<h1 id="data"></h1>
</center>
</body>
</html>
In the CoffeeScript callback function, I'm thinking I should be able to
select the elements of the JSON object by saying "result.txt" and
"result.dat" but that doesn't work, so I'm guessing I haven't really created
a JSON object, just a string. Or I've missed some other step or point.
-- Bruce Eckel
www.Reinventing-Business.com
www.MindviewInc.com
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