Actionscript 3 - parsing XML values

Question

I have the following XML:

<document>
    <homeitems>
        <homeitem>
            <itemURL>URL1.html</itemURL>
        </homeitem>
        <homeitem>
             <itemURL>URL2.html</itemURL>
        </homeitem>
        <homeitem>
             <itemURL>URL3.html</itemURL>
             <itemImage>image3.jpg</itemImage>
        </homeitem>
    </homeitems>
</document>

And the following code that parses it:

var XMLData:XML = new XML(LoaderMax.getContent("xmlDoc")); // loads XML
var numitems = XMLData.homeitems.homeitem.length();

for (var i=0;i<numitems;i++) {
    if ((XMLData.homeitems.homeitem[i].itemImage) && (XMLData.homeitems.homeitem[i].itemImage!=="")) {
        trace("Loading image "+XMLData.homeitems.homeitem[i].itemImage);
    }
}

Trace result:

Loading image
Loading image
Loading image image3.jpg

WHY?!?!? Shouldn't it skip the items that don't have images? Am I stupid?

Patrick · Accepted Answer · 2011-10-03 10:33:34Z

You can see that your test if (XMLData.homeitems.homeitem[i].itemImage) evaluate to true (just do a trace(Boolean(XMLData.homeitems.homeitem[i].itemImage) you will see true).

Also don't compare a node to a String use the toString method of the node or cast it explicitely to a String (i.e. String(XMLData.homeitems.homeitem[i].itemImage)!="" or XMLData.homeitems.homeitem[i].itemImage.toString()!="" )

There is multiple way todo it :

You can test if the node is undefined :

if (XMLData.homeitems.homeitem[i].itemImage != undefined)

Use hasOwnProperty method :

if (XMLData.homeitems.homeitem[i].hasOwnProperty('itemImage'))

And you can also cast your itemImage to a String and see if it's != "" :

if (String(XMLData.homeitems.homeitem[i].itemImage) != "")

Using e4x and foreach you can have a cleaner code for your loop :

for each(var homeItem:XML in XMLData.homeitems.homeitem) {
    var itemImage:String = String(homeItem.itemImage)
    if (itemImage!="") {
        trace("Loading image "+itemImage);
    }
}

Bartek · Accepted Answer · 2011-10-03 08:56:56Z

0

It's enough if you compare with != not !==

if ((XMLData.homeitems.homeitem[i].itemImage) && (XMLData.homeitems.homeitem[i].itemImage!="")) { 
    /* do somethong here */ 
}

answered Oct 3, 2011 at 8:56

Bartek

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3 Comments

A-OK Over a year ago

Ok, but that doesn't change anything. Output is still the same

Bartek Over a year ago

Try XMLData.homeitems.homeitem[i].itemImage != NULL && XMLData.homeitems.homeitem[i].itemImage != ""

A-OK Over a year ago

1120: Access of undefined property NULL, should have been lowercase null... but still no change - the conditional still evaluates as true

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