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KilLrBuNieZ

2008-Jan-17 22:36 UTC

JSON query problems

I am constructing a JSON object that is an array of products. Using a
select box, I want to find the object in the array that has an ID that
matches the value from the selectedIndex of the select box and return
the price.

Here is the JSON script:

var products = [{''ID'': 16378, ''Cost'':
100.00},{''ID'': 16377,''Cost'':
112.00},{''ID'': 16376,''Cost'': 141.00}]

I am getting the ID value from the select box with this:

var id = $F("mySelectBox");

How would I use prototype to find the object with the matching ID and
return it''s cost?

Thanks!
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Gareth Evans

2008-Jan-17 22:42 UTC

head link

Re: JSON query problems

i think you use find with a predicate/iterator function (i prefer to call
this one a predicate)

var id = $F("mySelectBox");
var selectedItem = products.find(function(item){ return (item.ID == id); });
alert(selectedItem.inspect());

On Jan 18, 2008 11:36 AM, KilLrBuNieZ
<eightseventeen-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> I am constructing a JSON object that is an array of products. Using a
> select box, I want to find the object in the array that has an ID that
> matches the value from the selectedIndex of the select box and return
> the price.
>
> Here is the JSON script:
>
> var products = [{''ID'': 16378, ''Cost'':
100.00},{''ID'': 16377,''Cost'':
> 112.00},{''ID'': 16376,''Cost'': 141.00}]
>
> I am getting the ID value from the select box with this:
>
> var id = $F("mySelectBox");
>
> How would I use prototype to find the object with the matching ID and
> return it''s cost?
>
> Thanks!
> >
>
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KilLrBuNieZ

2008-Jan-17 22:59 UTC

head link

Re: JSON query problems

I tried your example, which is similar to what I was attempting:

var id = $F("mySelectBox");
var selectedItem = products.find(function(item){ return (item.ID =id); });
alert(selectedItem.inspect());

...and the I got an exception on the alert line: "selectedItem has no
properties"

I know the id exists, so what could be the problem? This should be a
lot simpler than it is turning out to be.


On Jan 17, 4:42 pm, "Gareth Evans"
<agr...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> i think you use find with a predicate/iterator function (i prefer to call
> this one a predicate)
>
> var id = $F("mySelectBox");
> var selectedItem = products.find(function(item){ return (item.ID == id);
});
> alert(selectedItem.inspect());
>
> On Jan 18, 2008 11:36 AM, KilLrBuNieZ
<eightsevent...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
>
>
> > I am constructing a JSON object that is an array of products. Using a
> > select box, I want to find the object in the array that has an ID that
> > matches the value from the selectedIndex of the select box and return
> > the price.
>
> > Here is the JSON script:
>
> > var products = [{''ID'': 16378,
''Cost'': 100.00},{''ID'':
16377,''Cost'':
> > 112.00},{''ID'': 16376,''Cost'':
141.00}]
>
> > I am getting the ID value from the select box with this:
>
> > var id = $F("mySelectBox");
>
> > How would I use prototype to find the object with the matching ID and
> > return it''s cost?
>
> > Thanks!--~--~---------~--~----~------------~-------~--~----~
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Ken Snyder

2008-Jan-17 23:41 UTC

head link

Re: JSON query problems

KilLrBuNieZ wrote:> I tried your example, which is similar to what I was attempting:
>
> var id = $F("mySelectBox");
> var selectedItem = products.find(function(item){ return (item.ID => id);
});
> alert(selectedItem.inspect());
>
> ...and the I got an exception on the alert line: "selectedItem has no
> properties"
>   the selectedItem is an object, particularly {''ID'':
16377,''Cost'': 112.00} when id is 16377, for example. Try

alert(selectedItem.Cost);


but would it be easier to store the info right on the checkbox in the 
first place?

<input type="checkbox" name="product[16378]"
value="100.00" />
<input type="checkbox" name="product[16377]"
value="112.00" />
<input type="checkbox" name="product[16376]"
value="141.00" />

$("mySelectBox").value;

- Ken Snyder

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Gareth Evans

2008-Jan-18 02:12 UTC

head link

Re: JSON query problems

Sorry my mistake. I forgot you can''t use inspect on objects. I should
have
used Object.toJSON(selectedItem)

It was there for debugging though, to access specific properties use
selectedItem.<propertynamecasesensitive> without the angle brackets.



On Jan 18, 2008 12:41 PM, Ken Snyder
<kendsnyder-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> KilLrBuNieZ wrote:
> > I tried your example, which is similar to what I was attempting:
> >
> > var id = $F("mySelectBox");
> > var selectedItem = products.find(function(item){ return (item.ID =>
> id); });
> > alert(selectedItem.inspect());
> >
> > ...and the I got an exception on the alert line: "selectedItem
has no
> > properties"
> >
> the selectedItem is an object, particularly {''ID'':
16377,''Cost'': 112.00}
> when id is 16377, for example. Try
>
> alert(selectedItem.Cost);
>
>
> but would it be easier to store the info right on the checkbox in the
> first place?
>
> <input type="checkbox" name="product[16378]"
value="100.00" />
> <input type="checkbox" name="product[16377]"
value="112.00" />
> <input type="checkbox" name="product[16376]"
value="141.00" />
>
> $("mySelectBox").value;
>
> - Ken Snyder
>
> >
>
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