Hi Gabriel - many thanks for this tip!
All the best
George
On Dec 5, 10:04 pm, "Gabriel Gilini" <[EMAIL PROTECTED]> wrote:
> I forgot to say that apparently Safari <= 2.0 and IE5.2 on mac doesn't
> implement the hasOwnProperty method.
>
> Gabriel Gilini
>
> www.usosim.com.br
> [EMAIL PROTECTED]
> [EMAIL PROTECTED]
>
> On Fri, Dec 5, 2008 at 8:01 PM, Gabriel Gilini <[EMAIL PROTECTED]>wrote:
>
> > If you want to iterate through an array with the constructor object's
> > prototype extended use Object.prototype.hasOwnProperty().
>
> > var arr = [0,1,2,'foo','bar'];
>
> > for(var i in arr){
> > if(arr.hasOwnProperty){
> > if(arr.hasOwnProperty(i))
> > alert(arr[i]);
> > }
> > }
>
> > Gabriel Gilini
>
> >www.usosim.com.br
> > [EMAIL PROTECTED]
> > [EMAIL PROTECTED]
>
> > On Fri, Dec 5, 2008 at 11:37 AM, T.J. Crowder <[EMAIL PROTECTED]>wrote:
>
> >> Hi George,
>
> >> (It's a JavaScript rather than Prototype/script.aculo.us question,
> >> yes.)
>
> >> This object literal / JSON data:
>
> >> [{bookingref:'A6D98FGR', canceled:0}]
>
> >> ...defines an array with a single element, which is an object instance
> >> with two properties: bookingref (value 'A6D98FGR') and canceled
> >> (value 0).
>
> >> You can get the values just by referring to the properties of the
> >> object, so:
>
> >> var x = RS[0].bookingref;
> >> alert(x); // Alerts 'A6D98FGR'
>
> >> JavaScript allows you to use property names both literally with dot
> >> notation (as above), and _also_ via string names using bracket
> >> notation; we could write the above like this instead:
>
> >> var x = RS[0]['bookingref'];
> >> alert(x); // Alerts 'A6D98FGR'
>
> >> Note the quotes, the square brackets, and the absense of the dot.
>
> >> If you don't know the names of the properties in advance, you can use
> >> the for..in loop to iterate over the names of the object's properties:
>
> >> var name;
> >> for (name in RS[0]) {
> >> alert(name + '=' + RS[0][name]);
> >> }
>
> >> In the loop, the variable 'name' is set on each iteration to the name
> >> of a property on the object, as a string. This is powerful when
> >> combined with bracket notation. On the object defined in your JSON
> >> above, that will show "bookingref=A6D98FGR" and "canceled=0"; the
> >> order is not defined and almost certainly will vary from
> >> implementation to implementation.
>
> >> Note that for..in is for iterating over the properties of an object,
> >> *not* the elements of an array. Many JavaScript programmers think
> >> it's for the latter, and they get into trouble as a result because
> >> Prototype adds some properties to arrays that they're not expecting to
> >> see. Details:
> >>http://proto-scripty.wikidot.com/prototype:tip-looping-through-arrays
>
> >> But again, it's totally fine for looping through the properties on an
> >> object, like your RS[0].
>
> >> HTH,
> >> --
> >> T.J. Crowder
> >> tj / crowder software / com
>
> >> On Dec 5, 12:18 pm, George <[EMAIL PROTECTED]> wrote:
> >> > Hi Folks,
>
> >> > This may be more of a pure JavaScript question than Prototype, but
> >> > here goes:
>
> >> > If I have a JSON array called RS for example containing this:
> >> > [{bookingref:'A6D98FGR', canceled:0}]
> >> > is there a way for me to programatically get the names and values?
>
> >> > I'd like to be able to do something like
> >> > RS[0].[0].name ((would be 'bookingref'))
> >> > RS[0].[0].value ((would be 'A6D98FGR'))
>
> >> > I hope that makes sense.
>
> >> > Many thanks
>
> >> > George
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