[racket] Run Code after Button Click using the racket/gui library

Hello,

Thank you very much for the help. I finally have it working correctly.

Thanks,
     Puzzledplane

On 10/27/2014 10:05 PM, Matthias Felleisen wrote:
>
> On Oct 27, 2014, at 7:46 PM, Derek C. wrote:
>
>> Hello,
>>
>> Thank you for the reply. It was very helpful.
>>
>> The only thing that I am confused in doing now is that I have to 
>> store the value of the zip code in order to use it within the API’s 
>> url. That is the first thing I was trying to do because I need to 
>> take the zip code that is entered and be able to add it within the 
>> url before the .xml extension.
>>
>> For 
>> Example:_http://api.wunderground.com/api/*snip*/conditions/q/ZIPCODE.xml_
>> where ZIPCODE is the zip code that was entered.
>
> See my sketch of the 'retrieve' function (not the fake one, the real 
> one). Change the format string to something so that
>
>  (format underground-format zip-code)
>
> makes the correct string. See
>
>  (format "hello/there/~a" "02115")
>
>
>> At first, I was attempting to get this value from the zipcodelabel 
>> message% object, using (define x (send zipcodelabel get-label)) but 
>> that would only give me the initial value of the message% which 
>> is "No Zip Code Entered".
>
>
> No it isn't. Add a '(displayln zip-code)' to the fake retrieve 
> function and you'll see that it retrieves the entered code.
>
>
>
>
>>
>> Thanks again,
>> Puzzledplane
>>
>> *From:* Matthias Felleisen <mailto:matthias at ccs.neu.edu>
>> *Sent:* ‎Monday‎, ‎October‎ ‎27‎, ‎2014 ‎1‎:‎56‎ ‎PM
>> *To:* Derek C. <mailto:puzzledplane at yahoo.com>
>> *Cc:* users at racket-lang.org <mailto:users at racket-lang.org>
>>
>>
>> On Oct 26, 2014, at 5:51 PM, Derek C. wrote:
>>
>>     I am trying to get the value of a label after a button is
>>     clicked. I know that I can use (send x get-label) to get the
>>     value of the label, but it only gets the initial value of the
>>     label in my case "No Zip Code Entered".
>>
>>
>> I don't know what you are asking. When I enter a zip code and click 
>> Submit, the zip code shows up in your text field.
>>
>>
>>     Also, after that button is pressed I would like to run code that
>>     queries an API and parses xml information using the zip code from
>>     the label. Below is my code:
>>
>>
>> See below. I have marked some small changes and sketched a way to get 
>> this going. I also fixed some basic style issues.
>>
>> Note: if this is homework, please forward the assignment so we can 
>> help more directly. If not, I recommend developing with testing in 
>> mind (see rackunit and submodules).
>>
>> -- Matthias
>>
>>
>>
>>
>>
>> #lang racket
>>
>> (require racket/gui/base)
>>
>> ;; -> Void
>> (define (main) ;; don't run directly, wrap in main function from the 
>> beginning; work with (module+ main ...) if you want to always run
>>   ;; Creates a Frame called mainframe
>>   (define mainframe
>>     (new frame%
>>          [label "Forecaster - Powered by Wunderground API"]
>>          [width 500]
>>          [height 500]
>>          [stretchable-width 500]
>>          [stretchable-height 500]))
>>   ;; Creates a Current Conditions group-box-panel
>>   (define maingroup
>>     (new group-box-panel%
>>          [label "Current Conditions:"]
>>          [parent mainframe]
>>          [min-height 450]
>>          [stretchable-height 450]))
>>   (define cclabel-text (new text%)) ; you want a editor here, not a 
>> message
>>   [send cclabel-text insert "Insert Conditions Here from API"] ;; add 
>> your initial string, though I am not sure what for
>>   (define cclabel  ;; now put the editor into a canvas
>>     (new editor-canvas%
>>          [parent maingroup]
>>          [label "current conditions"]
>>          [editor cclabel-text]))
>>   ;; Creates a Zip Code group-box-panel
>>   (define zipcodegroup
>>     (new group-box-panel%
>>          [label "Zip Code:"]
>>          [parent mainframe]
>>          [min-height 100]
>>          [stretchable-height 100]))
>>   ;; Zip Code Message Label -- Defaults to No Zip Code Entered
>>   (define zipcodelabel
>>     (new message%
>>          [parent zipcodegroup]
>>          [label "No Zip Code Entered"] ))
>>   ;; Zip Code Text-Field
>>   (define zipInput
>>     (new text-field%
>>          [parent zipcodegroup]
>>          [label ""]
>>          [init-value ""]
>>          [min-width 5]
>>          [stretchable-width 5]
>>          [callback
>>           (lambda(f ev)
>>             (define v (send f get-value))
>>             (unless (string->number v)
>>               (send f set-value (regexp-replace* #rx"[^0-9]+" v ""))))]))
>>   ;; Submit Button
>>   (define submit-button
>>     (new button%
>>          [parent zipcodegroup]
>>          [label "Submit"]
>>          [callback
>>           (lambda (button event)
>>             ;; use internal define over let only because it's easier
>>             (define zip-code (send zipInput get-value))
>>             (define weather  (retrieve zip-code))
>>             (send zipcodelabel set-label zip-code)
>>             ;; now insert weather into the editor, but clear it first
>>             (send cclabel-text select-all)
>>             (send cclabel-text clear)
>>             (send cclabel-text insert (prepare-as-text weather)))]))
>>   ;; -- IN --
>>   (send mainframe show #t))
>>
>> ;; helper but this may actually have to work on the editor directly 
>> to make it look good
>> (define (prepare-as-text list-of-pairs)
>>   (string-join
>>    (map (lambda (x) (format "~a ~a" (first x) (second x))) list-of-pairs)
>>    "\n"))
>>
>> ;XML Parsing:
>> ;
>> ;#lang racket
>>
>> ;; this module should presumably provide a retrieve function that 
>> does the hard work:
>> ;; (provide
>> ;;    ; ZipCode -> [Listof [List Symbol String]]
>> ;;    ; retrieve the information for the given zip code and deliver 
>> the result as an association list
>> ;;    ; -- examples here --
>> ;;    retrieve)
>> (require net/url xml xml/path)
>>
>> (define underground-url-format
>>   "http://api.wunderground.com/api/*snip*/conditions/q/autoip.xml 
>> <http://api.wunderground.com/api/%2asnip%2a/conditions/q/autoip.xml>")
>>
>> ;; I am taking a short-cut here:
>> (define (retrieve zip-code)
>>   (list (list 'Location: "Boston, MA") (list 'Conditions: "typical 
>> fall day")
>>         (list 'Temperature: "57o F")   (list 'Feels-Like: "damp, 
>> humid, earthy")
>>         (list 'Humidity: "67%")        (list 'Wind: "5mph, 
>> south-by-south-west")))
>>
>> (define (retrieve-to-be-done zip-code)
>>   (define curent-cond-url (string->url (format underground-url-format 
>> zip-code)))
>>   (define current-cond-port (get-pure-port curent-cond-url))
>>   (define response (port->string current-cond-port))
>>   (close-input-port current-cond-port)
>>   (define data (xml->xexpr
>>                 ((eliminate-whitespace '(response))
>>                  (read-xml/element (open-input-string response)))))
>>   (define curr-location (se-path*/list '(display_location full) data))
>>   (define curr-weather (se-path*/list '(current_observation weather) 
>> data))
>>   (define curr-temp (se-path*/list '(current_observation temp_f) data))
>>   (define curr-humidity (se-path*/list '(current_observation 
>> relative_humidity) data))
>>   (define curr-wind (se-path*/list '(current_observation wind_string) 
>> data))
>>   (define curr-feels-like (se-path*/list '(current_observation 
>> feelslike_f) data))
>>   (list (list 'Location: curr-location) (list 'Conditions: curr-weather)
>>         (list 'Temperature: curr-temp)  (list 'Feels-Like: 
>> curr-feels-like)
>>         (list 'Humidity: curr-humidity) (list 'Wind: curr-wind)))
>

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