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Re: [json] json as js variable

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  • Mark Ireland
    Here is one I prepared earlier:
    Message 1 of 19 , Dec 10, 2006
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      Here is one I prepared earlier:

      {"RECORDCOUNT":30,"COLUMNLIST":"EM,EY,ISSILO,ISWEATHER,LATITUDE,LONGITUDE,PERCENTCOMPLETE,PERCENTQUALITY,SM,UNIQUEID,STATIONNAME,SY,X,Y","DATA":{"EM":[12,5,12,4,10,10,10,10,10,10,10,10,10,10,10,12,10,10,9,12,11,11,12,12,12,10,10,9,3,10],"EY":[2005,2005,2005,2006,2006,2006,2006,2006,2006,2006,2006,2006,2006,2006,2006,2006,2006,.
      . . . . . .
      .....,"X":[291,28,152,171,109,96,268,126,250,123,174,188,199,251,91,238,147,274,97,274,126,167,100,145,207,146,120,160,241,232],"Y":[136,188,197,226,212,211,128,113,126,179,197,175,176,148,51,147,252,153,66,180,224,158,83,73,122,131,151,250,178,134]}};

      I could just loop through this testing for my uniqueID but surely someone
      has written something quicker and more reusable than that? Is this not a
      standard structure?

      >From: "Martin Cooper" <mfncooper@...>
      >Reply-To: json@yahoogroups.com
      >To: json@yahoogroups.com
      >Subject: Re: [json] json as js variable
      >Date: Sun, 10 Dec 2006 14:13:22 -0800
      >
      >On 12/10/06, Mark Ireland <markincuba@...> wrote:
      > >
      > >
      > > Thanks. I was hoping there was a js function library where you just pass
      > > the
      > > unique id and the row is returned.
      > > Is there one?
      >
      >
      >What do you mean? There is no concept of "row" in JSON, or even unique IDs,
      >for that matter, beyond the property names in an object. Any structure you
      >are imposing on your JSON objects is your own, so there isn't going to be a
      >library out there to manipulate that unless you write it. ;-)
      >
      >--
      >Martin Cooper
      >

      _________________________________________________________________
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    • Jesse Skinner
      It sounds like you want to use a JavaScript object, with your uniqueID column as the key. What you d do is somehow structure your JSON like so: { uniqueID1 :
      Message 2 of 19 , Dec 10, 2006
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        It sounds like you want to use a JavaScript object, with your uniqueID
        column as the key. What you'd do is somehow structure your JSON like so:

        {
        "uniqueID1": {
        "EM": 12,
        ......
        "Y": 136
        },

        "uniqueID2": {
        "EM": 5,
        ......
        "Y": 188
        },
        }

        then if this object is JSON, you could access JSON['uniqueID1'].EM where
        uniqueID1 is of course one of your unique IDs.

        If you really want to keep your JSON structure, you could loop over it
        once and create a JavaScript object like I've illustrated, and use that
        instead for your lookups.

        Hope that helps,

        Jesse Skinner
        http://www.thefutureoftheweb.com/

        Mark Ireland wrote:
        > Here is one I prepared earlier:
        >
        > {"RECORDCOUNT":30,"COLUMNLIST":"EM,EY,ISSILO,ISWEATHER,LATITUDE,LONGITUDE,PERCENTCOMPLETE,PERCENTQUALITY,SM,UNIQUEID,STATIONNAME,SY,X,Y","DATA":{"EM":[12,5,12,4,10,10,10,10,10,10,10,10,10,10,10,12,10,10,9,12,11,11,12,12,12,10,10,9,3,10],"EY":[2005,2005,2005,2006,2006,2006,2006,2006,2006,2006,2006,2006,2006,2006,2006,2006,2006,.
        >
        > . . . . . .
        > .....,"X":[291,28,152,171,109,96,268,126,250,123,174,188,199,251,91,238,147,274,97,274,126,167,100,145,207,146,120,160,241,232],"Y":[136,188,197,226,212,211,128,113,126,179,197,175,176,148,51,147,252,153,66,180,224,158,83,73,122,131,151,250,178,134]}};
        >
        > I could just loop through this testing for my uniqueID but surely someone
        > has written something quicker and more reusable than that? Is this not a
        > standard structure?
        >
      • Martin Cooper
        ... Depends on how you define standard , but no, it s not anything I would call a standard. I believe it s a format that comes from the CFJSON library, so
        Message 3 of 19 , Dec 10, 2006
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          On 12/10/06, Mark Ireland <markincuba@...> wrote:
          >
          > Here is one I prepared earlier:
          >
          >
          > {"RECORDCOUNT":30,"COLUMNLIST":"EM,EY,ISSILO,ISWEATHER,LATITUDE,LONGITUDE,PERCENTCOMPLETE,PERCENTQUALITY,SM,UNIQUEID,STATIONNAME,SY,X,Y","DATA":{"EM":[12,5,12,4,10,10,10,10,10,10,10,10,10,10,10,12,10,10,9,12,11,11,12,12,12,10,10,9,3,10],"EY":[2005,2005,2005,2006,2006,2006,2006,2006,2006,2006,2006,2006,2006,2006,2006,2006,2006,.
          > . . . . . .
          >
          > .....,"X":[291,28,152,171,109,96,268,126,250,123,174,188,199,251,91,238,147,274,97,274,126,167,100,145,207,146,120,160,241,232],"Y":[136,188,197,226,212,211,128,113,126,179,197,175,176,148,51,147,252,153,66,180,224,158,83,73,122,131,151,250,178,134]}};
          >
          > I could just loop through this testing for my uniqueID but surely someone
          > has written something quicker and more reusable than that? Is this not a
          > standard structure?


          Depends on how you define "standard", but no, it's not anything I would call
          a standard. I believe it's a format that comes from the CFJSON library, so
          that would be the place to look for helper code to access the data.

          --
          Martin Cooper


          >From: "Martin Cooper" <mfncooper@...>
          > >Reply-To: json@yahoogroups.com
          > >To: json@yahoogroups.com
          > >Subject: Re: [json] json as js variable
          > >Date: Sun, 10 Dec 2006 14:13:22 -0800
          > >
          > >On 12/10/06, Mark Ireland <markincuba@...> wrote:
          > > >
          > > >
          > > > Thanks. I was hoping there was a js function library where you just
          > pass
          > > > the
          > > > unique id and the row is returned.
          > > > Is there one?
          > >
          > >
          > >What do you mean? There is no concept of "row" in JSON, or even unique
          > IDs,
          > >for that matter, beyond the property names in an object. Any structure
          > you
          > >are imposing on your JSON objects is your own, so there isn't going to be
          > a
          > >library out there to manipulate that unless you write it. ;-)
          > >
          > >--
          > >Martin Cooper
          > >
          >
          > _________________________________________________________________
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          >
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          >


          [Non-text portions of this message have been removed]
        • Mark Ireland
          OK Now I have this: var myStuff = {
          Message 4 of 19 , Dec 10, 2006
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            OK Now I have this:
            var myStuff = {
            "80020":{"EM":10,"EY":2006,"ISSILO":1,"ISWEATHER":1,"LATITUDE":-35.9661,"LONGITUDE":144.3712,"PERCENTCOMPLETE":100,"PERCENTQUALITY":0,"SM":7,"STATIONID":80020,"STATIONNAME":GUNBOWER
            GEE TEE STUD,"SY":1910,"X":37,"Y":31},
            "80044":{"EM":10,"EY":2006,"ISSILO":1,"ISWEATHER":1,"LATITUDE":-35.9977,"LONGITUDE":144.4244,"PERCENTCOMPLETE":100,"PERCENTQUALITY":0,"SM":6,"STATIONID":80044,"STATIONNAME":PATHO
            WEST,"SY":1920,"X":55,"Y":41},....
            "80056":{"EM":10,"EY":2006,"ISSILO":0,"ISWEATHER":1,"LATITUDE":-36.2497,"LONGITUDE":144.9531,"PERCENTCOMPLETE":90,"PERCENTQUALITY":0,"SM":1,"STATIONID":80056,"STATIONNAME":TONGALA,"SY":1929,"X":232,"Y":126}
            };

            but I get "missing } after property list" before I have even done anything
            with it.

            >From: Jesse Skinner <jesse@...>
            >Reply-To: json@yahoogroups.com
            >To: json@yahoogroups.com
            >Subject: Re: [json] json as js variable
            >Date: Sun, 10 Dec 2006 18:04:05 -0500
            >
            >It sounds like you want to use a JavaScript object, with your uniqueID
            >column as the key. What you'd do is somehow structure your JSON like so:
            >
            >{
            > "uniqueID1": {
            > "EM": 12,
            > ......
            > "Y": 136
            > },
            >
            > "uniqueID2": {
            > "EM": 5,
            > ......
            > "Y": 188
            > },
            >}
            >
            >then if this object is JSON, you could access JSON['uniqueID1'].EM where
            >uniqueID1 is of course one of your unique IDs.
            >
            >If you really want to keep your JSON structure, you could loop over it
            >once and create a JavaScript object like I've illustrated, and use that
            >instead for your lookups.
            >
            >Hope that helps,
            >
            >Jesse Skinner
            >http://www.thefutureoftheweb.com/
            >

            _________________________________________________________________
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          • Matthew Morley
            *Identifiers* are names for constants, variables, functions, loop labels, objects and classes. The first character must be an ASCII letter, underscore or
            Message 5 of 19 , Dec 11, 2006
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              *Identifiers* are names for constants, variables, functions, loop labels,
              objects and classes. The first character must be an ASCII letter, underscore
              or dollar sign. Following characters can also include digits.

              Even 'u80020' will do. You can only use numeric indexes if you are producing
              an array.

              --
              Matthew P. C. Morley


              [Non-text portions of this message have been removed]
            • Mark Ireland
              Thanks, that got it working. Now I am wondering if there is some alternative to repeating the column names in every object. ...
              Message 6 of 19 , Dec 17, 2006
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                Thanks, that got it working.

                Now I am wondering if there is some alternative to repeating the column
                names in every object.


                >From: "Matthew Morley" <WickedLogic@...>
                >Reply-To: json@yahoogroups.com
                >To: json@yahoogroups.com
                >Subject: Re: [json] json as js variable
                >Date: Mon, 11 Dec 2006 06:41:03 -0500
                >
                >*Identifiers* are names for constants, variables, functions, loop labels,
                >objects and classes. The first character must be an ASCII letter,
                >underscore
                >or dollar sign. Following characters can also include digits.
                >
                >Even 'u80020' will do. You can only use numeric indexes if you are
                >producing
                >an array.
                >
                >--
                >Matthew P. C. Morley
                >
                >
                >[Non-text portions of this message have been removed]
                >

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              • Matthew Morley
                Why not return an object w/ 2 properties. One being an array containing field names, the other being an array of arrays, representing data records (that match
                Message 7 of 19 , Dec 17, 2006
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                  Why not return an object w/ 2 properties.

                  One being an array containing field names, the other being an array of
                  arrays, representing data records (that match the field layout).

                  Or the second object setup with properties named after the u80020, but still
                  being just an array of fields in that object.

                  --
                  Matthew P. C. Morley
                  MPCM Technologies Inc.


                  [Non-text portions of this message have been removed]
                • Mark Ireland
                  How would you use dot notation in each case? ... _________________________________________________________________ Advertisement: Fresh jobs daily. Stop
                  Message 8 of 19 , Dec 17, 2006
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                    How would you use dot notation in each case?

                    >From: "Matthew Morley" <WickedLogic@...>
                    >Reply-To: json@yahoogroups.com
                    >To: json@yahoogroups.com
                    >Subject: Re: [json] json as js variable
                    >Date: Sun, 17 Dec 2006 22:10:06 -0500
                    >
                    >Why not return an object w/ 2 properties.
                    >
                    >One being an array containing field names, the other being an array of
                    >arrays, representing data records (that match the field layout).
                    >
                    >Or the second object setup with properties named after the u80020, but
                    >still
                    >being just an array of fields in that object.
                    >
                    >--
                    >Matthew P. C. Morley
                    >MPCM Technologies Inc.
                    >
                    >
                    >[Non-text portions of this message have been removed]
                    >

                    _________________________________________________________________
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                  • Matthew Morley
                    You would have to do something more than a simple translation. If your end goal was to directly reference fields values by name, you would need to do an end
                    Message 9 of 19 , Dec 18, 2006
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                      You would have to do something more than a simple translation.

                      If your end goal was to directly reference fields values by name, you would
                      need to do an end translation back to the object format in which you were
                      trying to avoid by duplicating names. Just a loop to recreate the data
                      object from the two arrays.

                      You have the knowledge of the fields names and could do your looping in
                      another manner, without direct reference anyway. Depends how exposed it is I
                      suppose and what level of work you want consumers of the data to do/know. I
                      found gzip an easier alternative than object rebuilding when looking at
                      performance in my projects

                      Depending on the size of your data and lots of other items, it is likely to
                      be faster for transmitting due to reduced payload, but it requires you to
                      deal with the arrays and not objects unless you rebuild them.

                      var row = MyStuff.u80020;
                      var field_ISWEATHER = 3;
                      var val = MyStuff.u80020[field_ISWEATHER];

                      --
                      Matthew P. C. Morley
                      MPCM Technologies Inc.


                      [Non-text portions of this message have been removed]
                    • Mark Ireland
                      Hopefully I can clear all this up. First I wanted to save on whitespace by avoiding var myArray = new Array; cfloop var myArray[myIndex] = new Array;
                      Message 10 of 19 , Dec 18, 2006
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                        Hopefully I can clear all this up. First I wanted to save on whitespace by
                        avoiding
                        var myArray = new Array;
                        cfloop
                        var myArray[myIndex] = new Array;
                        myArray[myIndex]['mycolumnName1']=#myQuery.myColumn1#;
                        myArray[myIndex]['mycolumnName2']=#myQuery.myColumn2#;
                        etc
                        /cfloop

                        Then I thought I could dynamically name form elements and get stuff from a
                        js object that I could reference with dot notation. (with myIndex as the id
                        of the element) Most of the stuff in the object is just flags that determine
                        how the page behaves.

                        If my goal is the shrink the page size what is the better approach?

                        Thanks


                        >From: "Matthew Morley" <WickedLogic@...>
                        >Reply-To: json@yahoogroups.com
                        >To: json@yahoogroups.com
                        >Subject: Re: [json] json as js variable
                        >Date: Mon, 18 Dec 2006 06:50:37 -0500
                        >
                        >You would have to do something more than a simple translation.
                        >
                        >If your end goal was to directly reference fields values by name, you would
                        >need to do an end translation back to the object format in which you were
                        >trying to avoid by duplicating names. Just a loop to recreate the data
                        >object from the two arrays.
                        >
                        >You have the knowledge of the fields names and could do your looping in
                        >another manner, without direct reference anyway. Depends how exposed it is
                        >I
                        >suppose and what level of work you want consumers of the data to do/know. I
                        >found gzip an easier alternative than object rebuilding when looking at
                        >performance in my projects
                        >
                        >Depending on the size of your data and lots of other items, it is likely to
                        >be faster for transmitting due to reduced payload, but it requires you to
                        >deal with the arrays and not objects unless you rebuild them.
                        >
                        >var row = MyStuff.u80020;
                        >var field_ISWEATHER = 3;
                        >var val = MyStuff.u80020[field_ISWEATHER];
                        >
                        >--
                        >Matthew P. C. Morley
                        >MPCM Technologies Inc.
                        >
                        >
                        >[Non-text portions of this message have been removed]
                        >

                        _________________________________________________________________
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                      • Matthew Morley
                        It would depend on what you mean by page and how much data you are dealing with. 3-10kb range might not make a huge difference on download, 20-300kb might. Run
                        Message 11 of 19 , Dec 19, 2006
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                          It would depend on what you mean by page and how much data you are dealing
                          with. 3-10kb range might not make a huge difference on download, 20-300kb
                          might. Run some tests and time them in js, just keep in mind that they will
                          vary from machine to machine greatly. I keep a 433mhz celeron laptop around
                          to make sure I don't lose sight of performance too much.

                          If you are worried about transmission speed and you have a fairly big set of
                          data going, consider sizing it down. I know it sounds simple, but the
                          fastest way to speed up anything is to do less; less data, less parsing.
                          Don't optimize and worry about speed until you can prove it is running
                          slowly and that the program is only `thinking` as much as it needs to.

                          If that is not possible or desired, look at compressing the output with
                          something like gzip if the browser supports it, but the numbers all get down
                          to your data set. Using objects vs an object with an array of results and an
                          array of keys is just a matter for the code/coder. Depends who your consumer
                          is. If you want an object, send an object, and compress the communication
                          would be my stance.

                          Are you generating raw js right into the initial page? If yes, consider
                          moving it out into a separate request. That way you can do initial loads and
                          refresh with the data as it becomes available.

                          --
                          Matthew P. C. Morley
                          MPCM Technologies Inc.


                          [Non-text portions of this message have been removed]
                        • Atif Aziz
                          I think I know what you re looking for here. Suppose the following table: var table = { columns : [ FirstName , LastName ], rows : [ [ Mickey , Mouse
                          Message 12 of 19 , Dec 19, 2006
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                            I think I know what you're looking for here. Suppose the following
                            table:

                            var table = {
                            "columns" : [ "FirstName", "LastName" ],
                            "rows" : [
                            [ "Mickey", "Mouse" ],
                            [ "Donald", "Duck" ],
                            [ "Minnie", "Mouse" ]
                            ]
                            };

                            Suppose further a function we add to the Array object's prototype:

                            Array.prototype.toObject = function(names)
                            {
                            var o = {};
                            for (var i = 0; i < names.length; i++)
                            o[names[i]] = i < this.length ? this[i] : null;

                            return o;
                            }

                            Now you can conveniently convert any row of the table into an object in
                            one swell swoop like this:

                            var o = table.rows[1].toObject(table.columns);

                            This gives you non-repeating column names in the original table
                            definition in JSON, which may be useful to keep the data on the wire
                            small, yet object-like access (dot-syntax) to a row once in script.

                            Hope this help.

                            -----Original Message-----
                            From: json@yahoogroups.com [mailto:json@yahoogroups.com] On Behalf Of
                            Mark Ireland
                            Sent: Sunday, December 17, 2006 11:19 PM
                            To: json@yahoogroups.com
                            Subject: Re: [json] json as js variable


                            Thanks, that got it working.

                            Now I am wondering if there is some alternative to repeating the column
                            names in every object.

                            >From: "Matthew Morley" <WickedLogic@...
                            <mailto:WickedLogic%40gmail.com> >
                            >Reply-To: json@yahoogroups.com <mailto:json%40yahoogroups.com>
                            >To: json@yahoogroups.com <mailto:json%40yahoogroups.com>
                            >Subject: Re: [json] json as js variable
                            >Date: Mon, 11 Dec 2006 06:41:03 -0500
                            >
                            >*Identifiers* are names for constants, variables, functions, loop
                            labels,
                            >objects and classes. The first character must be an ASCII letter,
                            >underscore
                            >or dollar sign. Following characters can also include digits.
                            >
                            >Even 'u80020' will do. You can only use numeric indexes if you are
                            >producing
                            >an array.
                            >
                            >--
                            >Matthew P. C. Morley
                            >
                            >
                            >[Non-text portions of this message have been removed]
                            >

                            __________________________________________________________
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                          • Mark Ireland
                            This is the right general idea but . . ... I am thinking: var myJSObject =
                            Message 13 of 19 , Dec 20, 2006
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                              This is the right general idea but . . ...

                              I am thinking:
                              var myJSObject =
                              {"RECORDCOUNT":3,"UNIQUEIDS":["js73012","js73016","js73029"],"COLUMNNAMES":["myColumnName1","myColumnName2","myColumnName3",.
                              . ...],"js73012":{"CURRENTROW":1,"c1":9,"c2":2006,"c3":007,. . ....}

                              all so I can build a table in a form with dynamically named checkboxs.

                              But am I reinventing the wheel here? Should I be using stuff from
                              prototype.js?


                              >From: "Atif Aziz" <atif.aziz@...>
                              >Reply-To: json@yahoogroups.com
                              >To: <json@yahoogroups.com>
                              >Subject: RE: [json] json as js variable
                              >Date: Tue, 19 Dec 2006 14:30:48 +0100
                              >
                              >I think I know what you're looking for here. Suppose the following
                              >table:
                              >
                              >var table = {
                              > "columns" : [ "FirstName", "LastName" ],
                              > "rows" : [
                              > [ "Mickey", "Mouse" ],
                              > [ "Donald", "Duck" ],
                              > [ "Minnie", "Mouse" ]
                              > ]
                              >};
                              >
                              >Suppose further a function we add to the Array object's prototype:
                              >
                              >Array.prototype.toObject = function(names)
                              >{
                              > var o = {};
                              > for (var i = 0; i < names.length; i++)
                              > o[names[i]] = i < this.length ? this[i] : null;
                              >
                              > return o;
                              >}
                              >
                              >Now you can conveniently convert any row of the table into an object in
                              >one swell swoop like this:
                              >
                              >var o = table.rows[1].toObject(table.columns);
                              >
                              >This gives you non-repeating column names in the original table
                              >definition in JSON, which may be useful to keep the data on the wire
                              >small, yet object-like access (dot-syntax) to a row once in script.
                              >
                              >Hope this help.
                              >
                              >-----Original Message-----
                              >From: json@yahoogroups.com [mailto:json@yahoogroups.com] On Behalf Of
                              >Mark Ireland
                              >Sent: Sunday, December 17, 2006 11:19 PM
                              >To: json@yahoogroups.com
                              >Subject: Re: [json] json as js variable
                              >
                              >
                              >Thanks, that got it working.
                              >
                              >Now I am wondering if there is some alternative to repeating the column
                              >names in every object.
                              >
                              > >From: "Matthew Morley" <WickedLogic@...
                              ><mailto:WickedLogic%40gmail.com> >
                              > >Reply-To: json@yahoogroups.com <mailto:json%40yahoogroups.com>
                              > >To: json@yahoogroups.com <mailto:json%40yahoogroups.com>
                              > >Subject: Re: [json] json as js variable
                              > >Date: Mon, 11 Dec 2006 06:41:03 -0500
                              > >
                              > >*Identifiers* are names for constants, variables, functions, loop
                              >labels,
                              > >objects and classes. The first character must be an ASCII letter,
                              > >underscore
                              > >or dollar sign. Following characters can also include digits.
                              > >
                              > >Even 'u80020' will do. You can only use numeric indexes if you are
                              > >producing
                              > >an array.
                              > >
                              > >--
                              > >Matthew P. C. Morley
                              > >
                              > >
                              > >[Non-text portions of this message have been removed]
                              > >
                              >
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