On 14 Dec 2011, at 05:47, skrite <sh...@skrite.net> wrote:
> ok, even though the @mapped_sites.to_json works, the output of that
> does not look like json. It looks like an array
>
If my memory is correct, that's valid json too ( as are most literals). It's
common for the top level thing to be an object rather than an array, but not
mandatory. Since the thing you called to_json on was an array, you got the json
representation of an array back.
To get the non text version of the response, like I said earlier look at
response.responseJSON
Fred
> example:
>
> var sites = [["35.931341","-102.32205",381.75,288.0,"AL","AL",
> 557,"#7F7F7F","#FF0000",287.1,288.3,"AL<br>0 psi",0],
> ["35.88125039","-102.3088989",525.0,83.4,"DC","DC",
> 34280,"#7F7F7F","#FF0000",83.1,83.3,"DC<br>0 psi",0],
> ["35.88125039","-102.3226989",525.0,81.7,"DC2","DC2",
> 37241,"#000000","#FF0000",81.7,81.7,"DC2<br>0 psi",0],
> ["35.92361","-102.308768",534.75,73.7,"J1","J1",
> 559,"#7F7F7F","#FF0000",74.7,73.8,"J1<br>0 psi",0],
> ["35.92332","-102.32096",493.5,261.0,"J2","J2",560,"#7F7F7F","#FF0000",
> 261.0,261.0,"J2<br>0 psi",0],["35.931354","-102.31308",
> 397.5,80.8,"SL1","SL1",561,"#7F7F7F","#FF0000",81.3,81.9,"SL1<br>0
> psi",0],["35.931186","-102.304202",390.0,165.2,"SL2","SL2",
> 110823130,"#7F7F7F","#FF0000",165.4,165.6,"SL2<br>0 psi",0],
> ["35.938729","-102.29968",397.5,89.3,"SL4","SL4",
> 563,"#7F7F7F","#FF0000",89.3,89.3,"SL4<br>0 psi",0],
> ["35.931301","-102.29965",397.5,23.7,"SL5","SL5",
> 564,"#7F7F7F","#FF0000",23.9,23.0,"SL5<br>0 psi",0],
> ["35.924694","-102.299034",333.75,95.8,"SL6","SL6",
> 7882,"#7F7F7F","#FF0000",95.8,95.8,"SL6<br>0 psi",0]];
>
> and the code seems to work with it like an array. How do i get the
> responseText from the server as an array?
>
> thanks again.
>
> sk
>
> On Dec 13, 4:08 pm, Frederick Cheung <frederick.che...@gmail.com>
> wrote:
>> On 13 Dec 2011, at 19:54, skrite <sh...@skrite.net> wrote:
>>
>>> Jim.
>>
>>> You are correct, when i show typeof(sites) from when sites = <%=
>>> @mapped_sites =>
>>> i get object
>>> when i do typeof(sites) after getting sites from the
>>> url_that_returns_json
>>> i get string
>>
>> responseText is always going to be text if I remember how prototype handles
>> thing (the text will just happen to be the string representation of the
>> json).
>> If the response content-type was set correctly then response.responseJson
>> (or something like that) should be populated
>>
>> Fred
>>
>>
>>
>>
>>
>>
>>
>>> i suppose that i am not getting returned correctly.
>>> if i look at the source of @mapped_sites
>>> and from the browser look at url_that_returns_json,
>>> they are identical.
>>
>>> thanks for your help, again.
>>> I have learned a lot the last couple of days :)
>>
>>> On Dec 12, 6:22 pm, Jim Ruther Nill <jvn...@gmail.com> wrote:
>>>> On Tue, Dec 13, 2011 at 6:08 AM, skrite <sh...@skrite.net> wrote:
>>>>> I am doing something similar here. The website is built on rails 2.3.9
>>>>> and
>>>>> uses prototype.
>>
>>>>> Almost all of what i need to happen does, but i get to the point where
>>>>> the update happens and nothing does.
>>
>>>>> // add circles to map as it initializes
>>>>> addCircles(sites, map, markerArray, lineArray);
>>
>>>>> var pe = new PeriodicalExecuter(refreshCircleMarkers.curry(markerArray,
>>>>> lineArray, map), 33);
>>
>>>>> function refreshCircleMarkers(markerArray, lineArray, map) {
>>>>> // first we remove the existing markers in place
>>>>> for(i=0; i<markerArray.length; i++) {
>>>>> markerArray[i].setMap(null);
>>>>> }
>>
>>>> // and empty the array itself> markerArray = [];
>>
>>>>> var url = "/group/update_mapv3_circles";
>>>>> new Ajax.Request(url, {
>>>>> method: 'get',
>>>>> onSuccess: function(response) {
>>>>> var sites = response.responseText;
>>>>> addCircles(sites, map, markerArray, lineArray);
>>>>> }
>>>>> });
>>
>>>> I see nothing wrong. Does the addCircles function expect a JSON
>>>> object for the first param? The only reason I can think why this isn't
>>>> working
>>>> is a type mismatch.
>>
>>>>> If i do an alert(response.responseText) the alert will show up and
>>>>> display the contents of the @mapped_sites.to_json ( i am using
>>>>> render :json => @mapped_sites.to_json in the controller).
>>>>> Please let me know if you see something i am doing wrong.
>>>>> Thanks for your help on this so far Jim.
>>
>>>>> sk
>>
>>>>> On Dec 9, 11:49 pm, Jim Ruther Nill <jvn...@gmail.com> wrote:
>>>>>> On Sat, Dec 10, 2011 at 3:56 AM, skrite <sh...@skrite.net> wrote:
>>>>>>> I am intrigued by this solution, Jim.
>>>>>>> i have a couple of questions, as it seems this is a cleaner way than
>>>>>>> what I am trying to do.
>>>>>>> The values that determine the circle color are in the database, and
>>>>>>> can change while the page is loaded. This is why i need them to
>>>>>>> update.
>>
>>>>>> i'll still go with my suggestion earlier. To update the colors, just
>>>>> update
>>>>>> the sites variable after completing the ajax request and then call
>>>>>> addCircles
>>
>>>>>> your ajax call may look like the following (this is totally untested :D)
>>
>>>>>> $.ajax({
>>>>>> url: your_url_here_that_returns_json_equivalent_of_@mapped_sites,
>>>>>> success: function(data) {
>>>>>> addCircles(data);
>>>>>> }
>>
>>>>>> });
>>>>>>> So, somehow i still need to go to the server for that. I guess i am
>>>>>>> missing the part about how to get the @mapped_sites variable to the
>>>>>>> controller and back again to the page to rebuild the circles.
>>>>>>> Thanks for your time on this.
>>>>>>> sk
>>
>>>>>>> On Dec 9, 9:48 am, Jim Ruther Nill <jvn...@gmail.com> wrote:
>>>>>>>> On Fri, Dec 9, 2011 at 11:04 PM, skrite <sh...@skrite.net> wrote:
>>>>>>>>> Hey, thanks for these links, very helpful.
>>>>>>>>> -sk
>>
>>>>>>>>> On Dec 8, 7:49 pm, "L.Karthikeyan" <logkart...@gmail.com> wrote:
>>>>>>>>>> Hi,
>>
>>>>>>>>>> For this you need to use rjs Ajax request. Please refer the
>>>>>>>>>> following links, you will get an idea.
>>
>>>>>>>>>> 1.http://railscasts.com/episodes/43-ajax-with-rjs?autoplay=true,
>>>>>>>>>> 2.
>>>>>>> http://railscasts.com/episodes/229-polling-for-changes?autoplay=true
>>
>>>>>>>> one more option is to keep @mapped_sites to a javascript variable so
>>>>> you
>>>>>>>> dont have to use ajax. you might also want to move the makeMarker
>>>>> part
>>>>>>>> to a js function to tidy up the view and just call that function
>>>>> when you
>>>>>>>> need
>>>>>>>> to update the colors
>>
>>>>>>>> something along the lines of
>>
>>>>>>>> var sites = <%= @mapped_sites.to_json %>;
>>>>>>>> addCircles(sites);
>>
>>>>>>>> function addCircles(circles) {
>>>>>>>> for(i=0; i<circles.length; i++) {
>>>>>>>> center = new google.maps.LatLng(circles[i][0], circles[i][1]);
>>>>>>>> siteCircle = makeMarker({
>>>>>>>> position: center,
>>>>>>>> strokeColor: "#FF0000",
>>>>>>>> strokeOpacity: 0.8,
>>>>>>>> strokeWeight: 2,
>>>>>>>> fillColor: circles[i][7],
>>>>>>>> fillOpacity: 0.75,
>>>>>>>> radius: 560,
>>>>>>>> map: map,
>>>>>>>> center: center,
>>>>>>>> radius: circles[i][2],
>>>>>>>> title: circles[i][5],
>>>>>>>> content: 'content'
>>>>>>>> });
>>>>>>>> }
>>
>>>>>>>> }
>>
>>>>>>>> then you just need to update the sites variable using js. no need
>>>>>>>> to go back to the server.
>>
>>>>>>>>>> On Thu, Dec 8, 2011 at 1:10 AM, skrite <sh...@skrite.net> wrote:
>>
>>>>>>>>>>> Hey all,
>>>>>>>>>>> i have a google map and i am drawing circles on the map like
>>>>> this..
>>
>>>>>>>>>>> var latlng = new google.maps.LatLng(35.931387,
>>>>>>>>>>> -102.31062);
>>>>>>>>>>> var myMapOptions =
>>>>>>>>>>> {
>>>>>>>>>>> zoom:
>>>>>>>>>>> 12,
>>>>>>>>>>> center:
>>>>>>>>>>> latlng,
>>>>>>>>>>> mapTypeId:
>>>>>>>>>>> google.maps.MapTypeId.HYBRID
>>>>>>>>>>> };
>>
>>>>>>>>>>> var map = new
>>>>>>>>>>> google.maps.Map(document.getElementById("map_canvas"),
>>>>>>>>>>> myMapOptions);
>>>>>>>>>>> var infoWindow = new
>>>>>>>>>>> google.maps.InfoWindow();
>>>>>>>>>>> var markerBounds = new
>>>>>>>>>>> google.maps.LatLngBounds();
>>
>>>>>>>>>>> <% @mapped_sites.each do |row|
>>>>>>>>>>> %>
>>
>>>>>>>>>>> // main
>>>>>>>>>>> circle
>>>>>>>>>>> center = new google.maps.LatLng(<%= "#{row[0]}" %>, <%=
>>>>>>>>>>> "#{row[1]}"
>>>>>>>>>>> %>);
>>>>>>>>>>> siteCircle =
>>>>>>>>>>> makeMarker({
>>>>>>>>>>> position:
>>>>>>>>>>> center,
>>>>>>>>>>> strokeColor:
>>>>>>>>>>> "#FF0000",
>>>>>>>>>>> strokeOpacity:
>>>>>>>>>>> 0.8,
>>>>>>>>>>> strokeWeight:
>>>>>>>>>>> 2,
>>>>>>>>>>> fillColor: '<%= "#{row[7]}"
>>>>>>>>>>> %>',
>>>>>>>>>>> fillOpacity:
>>>>>>>>>>> 0.75,
>>>>>>>>>>> radius:
>>>>>>>>>>> 560,
>>>>>>>>>>> map:
>>>>>>>>>>> map,
>>>>>>>>>>> center:
>>>>>>>>>>> center,
>>>>>>>>>>> radius: <%= "#{row[2]}"
>>>>>>>>>>> %>,
>>>>>>>>>>> title: '<%= "#{row[5]}"
>>>>>>>>>>> %>',
>>>>>>>>>>> content: '<%= "some contnet
>>>>>>>>>>> %>'
>>>>>>>>>>> });
>>
>>>>>>>>>>> markerArray.push(siteCircle);
>>
>>>>>>>>>>> my question is, that since the fillColor is going to change
>>>>> from
>>>>>>> time
>>>>>>>>>>> to time, i want to update all the colors of the circles
>>>>>>> periodically.
>>>>>>>>>>> What i don't know how to do is get the equivelent to the
>>>>>>>>>>> @mapped_sites because if i could, i think i could just delete
>>>>> the
>>>>>>>>>>> existing circles and draw new ones.
>>
>>>>>>>>>>> How do i get info back from the server periodically to update
>>>>> the
>>>>>>>>>>> circle colors?
>>
>>>>>>>>>>> thanks to all.
>>>>>>>>>>> skrite
>>
>>>>>>>>>>> --
>>>>>>>>>>> You received this message because you are subscribed to the
>>>>> Google
>>>>>>>>> Groups "Ruby on Rails: Talk" group.
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>>>>>>>>> .
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>>
>>>>>>>>>> --
>>
>>>>>>>>>> Regards,
>>>>>>>>>> L.KarthiKeyan.
>>
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>>
>>>>>>>> --
>>>>>>>> -------------------------------------------------------------
>>>>>>>> visit my blog athttp://jimlabs.heroku.com
>>
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>>
>>>>>> --
>>>>>> -------------------------------------------------------------
>>>>>> visit my blog athttp://jimlabs.heroku.com
>>
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>>>> visit my blog athttp://jimlabs.heroku.com
>>
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