On 07/28/2009 07:28 PM, David Pollak wrote:
> I'd do the REST API thing. The mechanisms that Lift has for handling
> API calls from the browser are numerous, but they are associated with
> a session (you can do ajaxCall or a S.buildJsonFunc).
Oh cool. When I listened to the podcast interview and heard about
fast-pathing AJAX calls, I realized that this was exactly what I wanted,
and that there wasn't a need to create a separate URL space just to
accomodate this page update functionality--at least, not explicitly in
the sense of what I meant by "API." Neat. Thanks for the method
pointers, too, that helped me focus my reading a bit. So here's what I
have. I have this JS code as an interface to the geolocation API:
function Location() {
this.lat = 0;
this.lon = 0;
this.update = function(lat, lon) {
this.lat = lat;
this.lon = lon;
this.onUpdate(lat, lon);
};
this.onUpdate = function(lat, lon) {};
}
var loc = new Location();
Next I wrote a snippet which needs to set loc.onUpdate to a function
that calls into Lift to update the page. I have:
class Geolocation {
def updatePosition(pos:String):JsCmd = Alert("Got an update: "+pos)
def update(in:NodeSeq):NodeSeq = <script type="text/javascript">
loc.onUpdate = function(lat, lon) {
{SHtml.ajaxCall(JsObj("lat" -> JsVar("lat"), "lon" ->
JsVar("lon")), updatePosition _)._2}
};
</script>
}
Two issues here. First, how do I get those braces around the JS function
containing the ajaxCall into my HTML? Seems like there should be a way
to escape braces so I can include them in NodeSeq, but \{ didn't seem to
do it. I'm also quite new to JS as well, so perhaps there's a better way
to set that callback. All I can come up with is changing the callback
signature to accept an object rather than individual values so perhaps I
can set it directly to the Lift-generated function, but I think I'd
rather have raw values for individual position components for now.
2. Ideally, I'd like for the JsObj to be an actual Map[String, Float].
Is there a way to do this? An included JSON parser that'd convert the
string to a type I specify, perhaps? (assuming I'd have to give some
sort of hint for Float vs. other numeric types, anyway)
Thanks. Wow, this really makes AJAX development something I'd actually
enjoy doing. :)
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