Yes, that's the right code. But I think it's "Gordian Knot". - Gordon
________________________________ From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Iko Knyphausen Sent: Wednesday, November 15, 2006 11:08 AM To: [email protected] Subject: RE: [flexcoders] Re: Namespace help please Hey Gordon. First of all, thanks very much for taking the time and laying it out for me. I really appreciate it. And it helped me solve the Gordic Knot (no pun intended ;-) Namespaces can appear a bit abstract at times. I'll implement in a second, one immediate question that crossed my mind... if I now wanted to address specific data members from the dg.selectedItem object, would I be able to use dg.selectedItem.ns::Name ? Thanks again...looking forward to becoming a namespace pro ;-) ________________________________ From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Gordon Smith Sent: Tuesday, November 14, 2006 11:54 PM To: [email protected] Subject: RE: [flexcoders] Re: Namespace help please > If you use an "e4x" xml that has a namespace as dataprovider it will not populate a datagrid properly. Yes it can, but you have to use the correct E4X syntax for accessing tags in namespaces; a complete working example is below. Keep two things in mind: 1. Every child tag like <Project>, <Name>, and <Company> inherits the default namespace that <Projects> declared. Therefore you have to always refer to them as ns::Project, ns::Name, and ns::Company in E4X expressions, where ns is a Namespace instance representing the http://schemas.microsoft.com/project <http://schemas.microsoft.com/project> namespace. 2. You need to use a labelFunction rather than a dataField on a DataGridColumn when you need to extract something that's in a namespace. Why? Because when you specify a dataField String, the data is extracted from the item as item[dataField]. For example, if you specify dataField="Name" then it tries to extract item["Name"]. But this isn't the right E4X expression since the <Name> tag has an implicit namespace. The correct E4X expression would be item.ns::Name or item.ns::["Name"] but there is no syntax where the namespace somehow goes inside the String in the square brackets. The dataField property dates back to the days before E4X, and it is just too limited for general use with XML, unless we add a property like dataNamespace to go along with it. (Which wouldn't be a bad idea, come to think of it.) I suggest getting used to using labelFunctions; you can be a namespace pro then. - Gordon <?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml <http://www.adobe.com/2006/mxml> " layout="vertical"> <mx:Script> <![CDATA[ private var xml:XML = <Projects xmlns="http://schemas.microsoft.com/project <http://schemas.microsoft.com/project> "> <Project> <Name>Project1</Name> <Company>Company1</Company> </Project> <Project> <Name>Project2</Name> <Company>Company2</Company> </Project> </Projects>; private var ns:Namespace = new Namespace("http://schemas.microsoft.com/project <http://schemas.microsoft.com/project> "); private function nameLabelFunction(item:Object, column:DataGridColumn):String { return item.ns::Name; } private function companyLabelFunction(item:Object, column:DataGridColumn):String { return item.ns::Company; } ]]> </mx:Script> <mx:DataGrid id="dg" dataProvider="{xml.ns::Project}"> <mx:columns> <mx:DataGridColumn headerText="Name" labelFunction="nameLabelFunction"/> <mx:DataGridColumn headerText="Company" labelFunction="companyLabelFunction"/> </mx:columns> </mx:DataGrid> </mx:Application> ________________________________ From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Iko Knyphausen Sent: Tuesday, November 14, 2006 9:29 PM To: [email protected] Subject: RE: [flexcoders] Re: Namespace help please Thanks Gordon. I agree namespaces are there for a reason. My reason for removing this one, is that without doing so I cannot bind to a datagrid. If you use an "e4x" xml that has a namespace as dataprovider it will not populate a datagrid properly. Thoughts? ________________________________ From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Gordon Smith Sent: Tuesday, November 14, 2006 8:52 PM To: [email protected] Subject: RE: [flexcoders] Re: Namespace help please I've never tried removeNamespace(), but I don't understand why you want to remove one. In general, you can't always remove namespaces without causing tag conflicts -- the namespaces are there for a reason, which is to disambiguate tags with the same unqualified tagname. Your particular example doesn't have this problem, but others you encounter in the future might. You should be accessing your tags in the namespace they live in. One way to do this is var ns:Namespace = new Namespace("http://schemas.microsoft.com/project <http://schemas.microsoft.com/project> "); trace(xml..ns::Name); - Gordon ________________________________ From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of iko_knyphausen Sent: Tuesday, November 14, 2006 8:14 PM To: [email protected] Subject: [flexcoders] Re: Namespace help please I could not help it, so I ended up working the XML string. The "removeNamespace" method simply doesn't work - no exceptions thrown either. I also tried removing the attribute "xmlns" but I guess that was naive and desperate. Could add attributes ok - so had nothing to do with the XML read-only or what have you... Well if anyone can confirm that this is a bug (removeNamespace method) - or that my assumptions/intentions for this method are wrong - that would already help. Thanks.... public function killMSProjectRootAndNameSpace() : void { var sTemp : String = xmlProjectData.lastResult.toString(); sTemp = sTemp.slice(54,-11); xmlProject = XMLList("<root>" + sTemp + "</root>"); } --- In [email protected], "iko_knyphausen" <[EMAIL PROTECTED]> wrote: > > > Hello everyone, > > I have fiddled for tooooooo long now trying to remove a namespace from > an XML... here is the data (coming out of a MS Project XML file, being > read via HTTPService, returnResult = "e4x") > > <Project xmlns="http://schemas.microsoft.com/project > <http://schemas.microsoft.com/project> "> > <Name>Project3.xml</Name> > <Company>....</Company> > ...etc... > </Project> > > I need to remove the nameSpace in order to properly populate a DataGrid. > Here is the code for how I attempted to remove the namespace (function > is triggered by the result event of the HTTPService): > > public var xmlProject : XML = null; > > public function killNameSpace() : void > { > var xmlTemp:XML = new XML(xmlProjectData.lastResult); > Alert.show(xmlTemp.namespaceDeclarations().length); // shows 1 which > is correct > var nsd:Namespace = xmlTemp.namespace(); > Alert.show(nsd.toString()); // shows the correct content of xmlns > attribute > xmlProject = xmlTemp.removeNamespace(nsd); > } > > Unfortunately, the namespace is stubborn and is not removed. Subsequent > calls to > > Alert.show(xmlProject.namespaceDeclarations().length); > > still show 1 as length which is incorrect, and the xmlProject var shows > the full XML with the namespace attribute in tact. > > What am I missing here? Did I misunderstand the purpose of > removeNamspace()? > > Thanks in advance for your help... >
