Hmm, well you'd have to do a little extra filtering but no reason this
isn't possible.
assuming "obj" is your main structure you just posted do something
like this...
var edgeArr = $H(obj.nodes).keys().findAll(function(itr){ return !
(obj.nodes[itr].edges instanceof Array);}).collect(function(key)
{ return obj.nodes[key]; });
edgeArr is now an array of all objects that have a valid edges
structure.
ps. You owe me one pint of beer.
On Jul 14, 10:47 pm, ronman <[email protected]> wrote:
> Yes, that's pretty close. attr is an object with properties, and one
> of those, attr.edges, is a nested object with its own nested sub-
> objects. All these properties and objects are constructed by evalJson
> () and then put in a $H() in a manner very similar to what you just
> described. I've copied a sample of the structure below.
>
> I was assuming that putting this whole thing within $A() would make
> the individual members (properties and objects) iterable, but perhaps
> I'm misunderstanding and instead every property and sub-object must be
> iterable (that is, understand the [] operator and have a length()
> method).
>
> Unfortunately, when the sub-object "edges" is empty, then running each
> () on the hash that contains it fails.
> arr.each(function(edgeProperty){
> // fails if "arr" is an empty Hash. works if "arr" is an empty
> Array. fails if "arr" is a filled Array.
>
> Notice that the first "edges" is empty and the second one has one
> member: "Brainwriting".
>
> from json:
> {
> "nodes": {
> "Brain Writing ": {
> "label": "BRAIN\\nWRITING ",
> "height": "0.50",
> "width": "0.83",
> "fontsize": "10.00",
> "fontcolor": "white",
> "pos": [
> 570,
> 213
> ],
> "id": "1695",
> "onmousedown": "startdrag('1695')",
> "length": 1,
> "edges": [
> ]
> },
> "A Perfect Brainstorm ": {
> "label": "A PERFECT\\nBRAINSTORM\\n",
> "height": "0.50",
> "width": "1.11",
> "fontsize": "10.00",
> "fontcolor": "white",
> "pos": [
> 326,
> 167
> ],
> "class": "node",
> "onmousedown": "startdrag('1701')",
> "length": 1,
> "edges": {
> "Brainwriting ": {
> "color": "black",
> "penwidth": "0.5",
> "fontname": "Arial",
> "URL": "javascript:void(predwin(2179))",
> "label": "• ",
> }
>
> Ron
> blog.ideatree.us
>
> On Jul 14, 4:47 pm, Matt Foster <[email protected]> wrote:
>
> > Oh I get it now,
>
> > attr.edges isn't an array of edge objects, its just an object with a
> > series of properties that define an edge to your shape?
>
> > If that is the case and you wish to iterate over the properties and
> > execute set on them explicitly, you could do something like...
>
> > var arr = $H(attr.edges).keys();
>
> > arr.each(function(edgeProperty){
>
> > this[edgeProperty].set(...);
>
> > }, attr.edges);
>
> > On Jul 14, 3:09 pm, ronman <[email protected]> wrote:
>
> > > Here's what I'm doing now:
> > > $A(attr.edges).each(function(edge) {
> > > edge.set(id, new GraphEdge(cv, id, edge));
>
> > > }, this);
>
> > > Same result. The iterator.length shows zero and the inside of the
> > > loop never executes. But the iterator is (correctly, I think) 'Object
> > > Brainwriting =Object'
>
> > > Just casting around, I also tried taking off the binding to 'this' at
> > > the end, doesn't help.
>
> > > As before, I'm not getting why anything whatsoever that's in an array
> > > shouldn't automatically return length > 0.
>
> > > On Jul 14, 1:47 pm, Matt Foster <[email protected]> wrote:
>
> > > > > $A(attr.edges).each(function(edge) {
> > > > > this.edge.set(id, new GraphEdge(cv, id, edge));
> > > > > }, this);
>
> > > > edge is your variable, why bother trying to set function ownership?
> > > > The function is sent the parameter it needs to act upon. Just remove
> > > > "this" from your "this.edge..." line and you should be good.
>
> > > > --
>
> > > >http://positionabsolute.net
>
> > > > On Jul 14, 2:28 pm, ronman <[email protected]> wrote:
>
> > > > > This is a newbie question, but I learn a lot every time I ask.
>
> > > > > Why do some objects return a zero length?
>
> > > > > I'm doing Array.each. In the array at this particular time is a
> > > > > single object. Firebug describes that object as
>
> > > > > Object Brainwriting color=black penwidth=0.5 fontname=Arial
>
> > > > > and I iterate through the array this way:
> > > > > $A(attr.edges).each(function(edge) {
> > > > > this.edge.set(id, new GraphEdge(cv, id, edge));
> > > > > }, this);
>
> > > > > But in Prototype's each method the 'edge' iterator (the Brainwriting
> > > > > Object), returns zero length:
> > > > > function $A(iterable) {
> > > > > if (!iterable) return [];
> > > > > if (iterable.toArray) return iterable.toArray();
> > > > > var length = iterable.length || 0, results = new Array(length);
> > > > > // LENGTH NOW IS ZERO
> > > > > while (length--) results[length] = iterable[length];
> > > > > return results;
>
> > > > > }
>
> > > > > Maybe the Brainwriting Object is not iterable, but I would expect $A
> > > > > (attr.edges) to have made it so before my call to each().
>
> > > > > Surely I'm not expected to assign a length attribute to objects myself
> > > > > - just lilke 'penwidth' and 'color' were assigned - in order to make
> > > > > Array.each() work on objects. Why doesn't the Object.length return
> > > > > non-zero when any kind of Object is instantiated?
>
> > > > > I'm using Firefox 3.0.10.
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