I am trying to compile some old actionscript code (part of flash app) to JS using Jangaroo. Jangaroo does not support the E4X syntax and it fails at things like the double-dot operator .. or the brackets filters a.(CONDITION). So I need to rewrite those portions of code using plain ActionScript.
For the double-dot operator, I used the instead the method descendants() but I could not find alternative way to write the brackets filter.
Here is the original code I had:
B = xml..destination.(#id == someId)
I wrote it now:
B = xml.descendants("destination").(#id == someId)
But I still want to remove .(#id == someId).
I am thinking of something like:
if (xml.descendants("destination").attribute("id") == someId)
{
B = xml.descendants("destination")
}
Is this possible?
So here is how I proceeded. I have not tested its functionality, but the compiler passed it.
var destinations:XMLList = null;
for each (var elm in xml.descendants("destination") )
{
if ( elm.attribute("id") == someId )
{
destinations += elm;
}
}
Related
I have to use a lot of Point constructors, like so :
function setLoc(o:*, loc:Point):void
{
o.x = loc.x;
o.y = loc.y;
}
setLoc(obj1, new Point(25,50));
setLoc(obj2, new Point(13,-5));
setLoc(obj3, new Point(186.5,-23));
...
Is there a way to write these in a more compact way, maybe some macros or compiler tricks ? It is very tedious to have to write "new Point(...)" for such a simple Class. I wish I could do something like :
setLoc(obj1, (25,50));
(I dont want to change setLoc(o,p) to setLoc(o,px,py) but I guess thats the best solution)
You could do this:
setLoc(obj1, {x:25, y:50});
Just change the type of the loc argument to Object:
function setLoc(o:*, loc:Object):void
{
o.x = loc.x;
o.y = loc.y;
}
With the new ASC 2.0 compiler I get warnings when I code like below:
// (_achievementsFromServer is an Array)
while(item=_achievementsFromServer.pop())
{
// do something with item here
}
The warning reads: "Assignment within conditional. Did you mean == instead of =?"
While in general I appreciate all warnings from the compiler, I'd like to suppress this one in this case because I did not mean == here. I want to pop all items in the array and do something with it until the array is empty.
while( (item=_achievementsFromServer.pop())==true )
seems to work but looks a bit confusing. Any other ideas?
This may seem better.
while(_achievementsFromServer.length > 0) {
var item:Object = _achievementsFromServer.pop();
}
Just like removeChild
var d:DisplayObjectContainer;
while(d.numChildren > 0) {
d.removeChildAt(0);
}
While I was hoping for some other way, I think #AmyBlankenship improved my own suggestion:
while((item=_achievementsFromServer.pop())!=null)
{
//....
}
It's clear and understandable what's going on, and doesn't rely on checking the length of the Array on every iteration.
Googling some more I found a compiler option -compiler.warn-assignment-within-conditional that could be set to false but then you won't be warned anywhere in your project anymore. And I'm not so confident that I never accidently type = instead of ==, so that's not a good solution I think.
Is there any way to do something like the following (pseudocode) in Flex:
var x:XML = <xml>
if(condition){
<tag>hello</tag>
}
</xml>;
which would return <xml><tag>hello</tag></xml> if the condition was true and <xml></xml> (or <xml/>) if the condition was false?
ADDITIONAL NOTE: I know how to append children, etc. I am looking for a way to do this in the literal expression.
I was really amazed at how simple it is, and at how powerful AS3 can be. The following actually worked:
var x:XML = <xml>{condition ? <tag>hello</tag> : ""}</xml>;
Use the appendChild method:
var sample:XML = <sample><items/></sample>;
if( condition ) sample.items.appendChild(<tag>hello</tag>);
else sample.items.appendChild( </tag> );
Actually I've parsed a website using htmlparser and I would like to find a specific value inside the parsed object, for example, a string "$199", and keep tracking that element(by periodic parsing) to see the value is still "$199" or has changed.
And after some painful stupid searching using my eyes, I found the that string is located at somewhere like this:
price = handler.dom[3].children[3].children[3].children[5].children[1].
children[3].children[3].children[5].children[0].children[0].raw;
So I'd like to know whether there are methods which are less painful? Thanks!
A tree based recursive search would probably be easiest to get the node you're interested in.
I've not used htmlparser and the documentation seems a little thin, so this is just an example to get you started and is not tested:
function getElement(el,val) {
if (el.children && el.children.length > 0) {
for (var i = 0, l = el.children.length; i<l; i++) {
var r = getElement(el.children[i],val);
if (r) return r;
}
} else {
if (el.raw == val) {
return el;
}
}
return null;
}
Call getElement(handler.dom[3],'$199') and it'll go through all the children recursively until it finds an element without an children and then compares it's raw value with '$199'. Note this is a straight comparison, you might want to swap this for a regexp or similar?
I m just starting with microsoft (MVC,C#, LINQ), so far so good, but i have a question about LINQ uses, How do i get the value form a LINQ like this one?
var x = from a in db.tablex
where a.eventID == eventID
select new
{
owner = a.owner,
shipper = a.shipper,
consignee = a.consignee
};
I try something like "r.owner" inside a foreach to get the value retrieved from DB
foreach (var r in x)
but its not working.. i dont get intellisense either.. how do i get the value??. I saw several examples and it seems to work like this, but for some reason its not working.. Thanks
Ok guys here was the thing, (it wasnt the typo it was just in the post), i was missing a using :
using System.Reflection;
with this C# automatically creates a class from them, and now it works
What a noob of me =).
foreach (var r in x)
{
var owner = r.owner;// not x.owner
}