Hi everybody I'm studying E4X and I discover how it is powerfull. I agree with Ben: it is really objects.
just one more detail: _/[EMAIL PROTECTED]"toto" means the element "subject" where the attribute "id" equals "toto" /<subject id="toto"> ...</subject> /while subject.(@id=="toto") means the element "subject" whith the included element "id" equals "toto" /<subject>... <id>toto</id> ...</subject> regards Hervé _ Ben Stucki a écrit : > Hey Pedro, > > Welcome to FlexCoders! > > I came into E4X with a background in XPath as well and think the > biggest hurdle in learning E4X was understanding the methodology > behind it. XPath is intended as a query language for XML. In contrast > I think of E4X more like an object representation of XML. This means > it can treat results a little differently based on the form of the XML > , such as when you get results with only one subject node but not with > multiple subject nodes. I've found that while I work with XPath from > the top down, I get the best results from E4X when I check it from the > inside out. Here's how the original query works out. > > > idHTTPService.lastResult.record .( [EMAIL PROTECTED]"c001") > > The inner most part is @id="c001". The main problem with this is that > it uses the assignment (=) operator and not evaluation (==). This > means that istead of looking for an id attribute value of "c001", it's > actually creating or overrideing the id attribute. So we'll change > that to ==. > > > idHTTPService.lastResult.record .( [EMAIL PROTECTED]"c001") > > The next part to evaluate is [EMAIL PROTECTED]"c001". The problem here is > that while @id=="c001" is meant as a filter, it's not in parenthesis. > So we'll change that to subject.(@id=="c001") . > > > The rest works already, so here's the end result. > > > idHTTPService.lastResult.record .( subject.(@id=="c001")) > > > It takes a little getting used to, but I've found that E4X can > normally handle what I need it to do. > > Ben Stucki > -------------------------------------- > We're Hiring! Seeking a passionate developer to join our team building > Flex based products. Position is in the Washington D.C. > metro area. If interested contact [EMAIL PROTECTED] > <mailto:[EMAIL PROTECTED]> > > ------------------------------------------------------------------------ > *From*: "Pedro Pastor" <[EMAIL PROTECTED]> > *Sent*: Friday, February 09, 2007 6:26 PM > *To*: flexcoders@yahoogroups.com > *Subject*: [flexcoders] New to the group > > Hello to all of you. > > > > I have just entered this group. I am quite new to those technologies > (Flex 2 and ActionScript 3). > > > > After reading some documentation I'm doing some practising and I have > some questions to this community. > > > > 1) E4X query language: > > > > I'm used to work with XPath for dealing with XML structures. I've > tried to do some (not very complicated) queries using E4X BUT it seems > like E4X doesn't work the same way (and it is far from fulfilling the > XML queries needs). For example, given the following XML date: > > > > <ROOT> > > <record> > > <data>..... </data> > > <subject id="c001">AAAAAAAA</name> > > <subject id="c002">BBBBBBBBBB</name> > > <subject id="c003">CCCCCCC</name> > > </record> > > > > <record> > > <data>..... </data> > > <subject id="c001">AAAAAAAA</name> > > <subject id="c005">HHHHHHHHH</name> > > </record> > > > > And so on... > > > > </ROOT> > > > > Using an <mx:HTTPService id="idHTTPService" .. resultFormat="e4x"> > > > > And asking for: > > > > idHTTPService.lastResult.record .( [EMAIL PROTECTED]"c001 > <mailto:[EMAIL PROTECTED]>") > > > > this query only provides the record elements that have ONLY ONE > <subject> child AND has an "@id == c001". I mean, the <record> tags > with more than one <subject> children always fail. > > > > - Is this the correct behaviour? > > - How can I perform such type of query? > > > > Thank you very much in advance. > > > > Pedro > > > -- > No virus found in this outgoing message. > Checked by AVG Free Edition. > Version: 7.5.441 / Virus Database: 268.17.32/677 - Release Date: > 08/02/2007 21:04 > > >
