How can I provide AJAX calls to 3er party libraries?

Hi Mariano,

I’ve been trying to work out callbacks recently. There seems to be a number of ways of doing this depending on your requirements. There may be typos in the following but hopefully it points you in the right direction :)

In the example you provided, the JSON is coming from an external server. I’m guessing that you want the JSON coming from your own backend via seaside.

renderContentOn: canvas

| start end |

(canvas jQuery getJson

        callback: [ :eventData |

 start := eventData first.

end := eventData last ]

          value: (JSStream on: 'new Array(Math.round(e.min),Math.round(e.max))'));

        text: [ :stream | 

              stream

                json:

                      GRSmallDictionary new

                        at: ’someKey' put: ’someValue';

                        yourself ]) ];

        onSuccess: ((JSStream on: 'chart.series[0].setData(data);') asFunction: #(‘data'));

        dataType: 'jsonp').

or

(html jQuery ajax

callback: [ :eventData | self doSomething: eventData ]

json: (JSStream on: 'new Array(Math.round(e.min),Math.round(e.max))'));

Then you can respond from somewhere in #doSomething:

doSomething: eventData

| start end jsonResponse |

start := eventData first.

end := eventData last.

jsonResponse := GRSmallDictionary new at: ‘someKey’ put: ‘someValue’; yourself.

 self requestContext

    respond: [ :response | 

      response

        doNotCache;

        contentType:

            (WAMimeType applicationJson charset: self requestContext handler charSet).

      response stream json: jsonRespnose

Alternatively if you need to specify a URL that the JS Library may use many times and pass or post query options, you can do something like:

urlForCallbacksFromJSLib

  | connectorUrl |

  connectorUrl := self renderContext actionUrl copy

    addField:

        (self renderContext callbacks

            store: (JSAjaxCallback on: [ self processCallback ]));

    yourself.

  self url: connectorUrl

…and then you can do whatever you need in the #processCallback method...

processCallback

  | start end jsonRespnose |

start := self requestContext request at: ‘start’.

end := self requestContext request at: ‘end’.

  jsonRespnose := self jsonObjectToBeReturnedToClient

  self requestContext

    respond: [ :response | 

      response

        doNotCache;

        contentType:

            (WAMimeType applicationJson charset: self requestContext handler charSet).

      response stream json: jsonRespnose ]

I hope there’s something there that will help.

Cheers,

J

On 12 Jan 2017, at 3:15 am, Mariano Martinez Peck <[hidden email]> wrote:

Hi guys, 

I know how to use AJAX but always everything inside Seaside. I know need a way to provide JSON responses to AJAX calls made by a 3er party lib. For example, in Highstocks [1], there is an example like this:

  /**

     * Load new data depending on the selected min and max

     */

    function afterSetExtremes(e) {

        var chart = Highcharts.charts[0];

        chart.showLoading('Loading data from server...');

        $.getJSON('https://www.highcharts.com/samples/data/from-sql.php?start=' + Math.round(e.min) +

                '&end=' + Math.round(e.max) + '&callback=?', function (data) {

            chart.series[0].setData(data);

            chart.hideLoading();

        });

    }

So... how could I provide that at my server side? 

Above JS would be code that I write in Seaside and it is passed to the client. Therefore, I THINK I am able to write that JS generating a URL with the correct _s and _k or whatever..

Thanks in advance for any lead you can give me here.

--

Mariano
http://marianopeck.wordpress.com

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