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JSON array help - xbasic

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    JSON array help - xbasic

    In my xbasic function I have a json result. It may or may not include an array.

    Question: How can I detect if my json result includes an array or not? I thought perhaps I could use eval_valid() but that gives me an error. Maybe I didn't apply it correctly.

    If I have an array I continue getting the count using size() and then loop through the results. If there is no array I just get the single value and do something else.


    Sample code...

    Code:
    'json array
    dim jSON as c = <<%json%
    #{"name":"John","cars":[ "Ford", "BMW", "Fiat" ]}
    #%json%
    
    'json with no array
    dim jSON as c = <<%json%
    #{"name":"John","cars":"Ford"}
    #%json%
    
    
    dim pjson as p
    
    
    pjson = json_parse(json)
    
    
    'When we have an array we can count it
    if eval_valid(pjson.cars.size())
    	dim count as n = 0
    		count = pjson.cars.size()
    	goto loop
    else
    	dim cars as c = ""
    		cars = pjson.cars
    	goto someWhereElse
    end if
    Mike Brown - Contact Me
    Programmatic Technologies, LLC
    Programmatic-Technologies.com
    Independent Developer & Consultant​​

    #2
    Re: JSON array help - xbasic

    Can you make it an array regardless? Then there may be instances of an array with only a single value, but if that is important to know, you can find out with the size command.
    Pat Bremkamp
    MindKicks Consulting

    Comment


      #3
      Re: JSON array help - xbasic

      An array, by definition, is more than one object, is it not? A result with a single value can't be an array. Furthermore, with a single result, you can not use size() against it because you'll get an error.
      ScreenShot_002.jpg
      Mike Brown - Contact Me
      Programmatic Technologies, LLC
      Programmatic-Technologies.com
      Independent Developer & Consultant​​

      Comment


        #4
        Re: JSON array help - xbasic

        try this as a script
        Code:
        dim json as c
        json = <<%str%
        {
        "name":"John",
        "age":30,
        "cars":[ "Ford", "BMW", "Fiat" ]
        }
        %str%
        dim pp as p
        pp = json_parse(json)
        msgbox("",pp.cars[1])
        edit:
        i see you want to check if an array exists.
        will post back.
        thanks for reading

        gandhi

        version 11 3381 - 4096
        mysql backend
        http://www.alphawebprogramming.blogspot.com
        [email protected]
        Skype:[email protected]
        1 914 924 5171

        Comment


          #5
          Re: JSON array help - xbasic

          I don't understand ...it gives me ford of course.

          Maybe I'm not being clear, sorry. I have a json result. It may or may not contain an array. If it doesn't have an array I use the result as is. If it does contain an array I get it's size (for a count) then loop through the results to use them as needed. To handle this I need to know, beforehand, if I have an array to begin with.
          Mike Brown - Contact Me
          Programmatic Technologies, LLC
          Programmatic-Technologies.com
          Independent Developer & Consultant​​

          Comment


            #6
            Re: JSON array help - xbasic

            Code:
            dim json as c
            json = <<%str%
            {
            "name":"John",
            "age":30,
            "cars":[ "Ford", "BMW", "Lexus" ]
            }
            %str%
            dim pp as p
            pp = json_parse(json)
            dim len as n
            len = pp.cars.size()
            if len > 1 then
            msgbox("","json object contains an array")
            else
            msgbox("","json object does not contain an array")
            end if
            this works when the array contains more than one element or when you remove two of them and just leave the first one.
            hope this is what you are looking for.
            thanks for reading

            gandhi

            version 11 3381 - 4096
            mysql backend
            http://www.alphawebprogramming.blogspot.com
            [email protected]
            Skype:[email protected]
            1 914 924 5171

            Comment


              #7
              Re: JSON array help - xbasic

              Yes, that indeed works. Thank you.

              However...

              My non-array json results are not returned as an array. I get something like this...

              Code:
              dim json as c
              
              json = <<%str%
              {
              "name":"John",
              "age":30,
              "cars":"Ford"
              }
              %str%
              
              dim pp as p
              
              pp = json_parse(json)
              
              
              dim len as n
              
              len = pp.cars.size()
              ERROR: Member property does not exist 
              pp.cars.size method not found.
              Mike Brown - Contact Me
              Programmatic Technologies, LLC
              Programmatic-Technologies.com
              Independent Developer & Consultant​​

              Comment


                #8
                Re: JSON array help - xbasic

                i haven't test this yet in a script,
                is_object(pp.cars) will return true is that is an array false single value as shown by you. then you can write a code as you want to play with it.
                thanks for reading

                gandhi

                version 11 3381 - 4096
                mysql backend
                http://www.alphawebprogramming.blogspot.com
                [email protected]
                Skype:[email protected]
                1 914 924 5171

                Comment


                  #9
                  Re: JSON array help - xbasic

                  Code:
                  dim json as c
                  json = <<%str%
                  {
                  "name":"John",
                  "age":30,
                  "cars":[ "Ford", "BMW", "Lexus" ]
                  }
                  %str%
                  dim pp as p
                  pp = json_parse(json)
                  if is_object(pp.cars) then
                  	msgbox("","json object contains an array")
                  else
                  msgbox("","json object does not contain an array")
                  end if
                  try this with both versions and see if it works.
                  thanks for reading

                  gandhi

                  version 11 3381 - 4096
                  mysql backend
                  http://www.alphawebprogramming.blogspot.com
                  [email protected]
                  Skype:[email protected]
                  1 914 924 5171

                  Comment


                    #10
                    Re: JSON array help - xbasic

                    https://www.screencast.com/t/YFpD50GM
                    a sample for you to see.
                    thanks for reading

                    gandhi

                    version 11 3381 - 4096
                    mysql backend
                    http://www.alphawebprogramming.blogspot.com
                    [email protected]
                    Skype:[email protected]
                    1 914 924 5171

                    Comment


                      #11
                      Re: JSON array help - xbasic

                      That did it! ...thank you again Gandhi for your help and patience. Learned a new method too: is_object().

                      I was looking all over in the alpha documentation for something just like that.
                      Mike Brown - Contact Me
                      Programmatic Technologies, LLC
                      Programmatic-Technologies.com
                      Independent Developer & Consultant​​

                      Comment


                        #12
                        Re: JSON array help - xbasic

                        Of course you can have an array with a single value

                        dim json as c
                        json = "[{ "programmer" : "Fred" , "experience" : [ "C++" ] }, { "programmer" : "Joe" ,"experience" : [ "C#" , "Javascript" , "Python" , "Go" ] } ]"

                        dim out as c = extension::json::JsonForceObjectArray(json)
                        ? json_reformat(out)
                        = [
                        {
                        "programmer": "Fred",
                        "experience": [
                        {
                        "__value": "C++"
                        }
                        ]
                        },
                        {
                        "programmer": "Joe",
                        "experience": [
                        {
                        "__value": "C#"
                        },
                        {
                        "__value": "Javascript"
                        },
                        {
                        "__value": "Python"
                        },
                        {
                        "__value": "Go"
                        }
                        ]
                        }
                        ]
                        Pat Bremkamp
                        MindKicks Consulting

                        Comment


                          #13
                          Re: JSON array help - xbasic

                          Thanks Pat.

                          Turns out I was applying eval_vaid() incorrectly. I should have wrapped the expression I was evaluating in double quotes.

                          if eval_valid("pjson.cars.size()")
                          Mike Brown - Contact Me
                          Programmatic Technologies, LLC
                          Programmatic-Technologies.com
                          Independent Developer & Consultant​​

                          Comment

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