XForms/Deep Copy with Insert Origin

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Contents

[edit] Motivation

You want to do a deep copy of complex XML from one instance to another instance within a model.

[edit] Method

We will use the XFroms xf:insert element with the origin attribute set to the source instance. We will use the nodeset attribute to indicate where the data should be copied to.

[edit] Link to XForms Application

Load XForms Application

[edit] Source Code

<html
     xmlns="http://www.w3.org/1999/xhtml"
     xmlns:ev="http://www.w3.org/2001/xml-events"
     xmlns:xsd="http://www.w3.org/2001/XMLSchema"
     xmlns:xf="http://www.w3.org/2002/xforms">
     <head>
          <title>Using Origin to do a Deep Copy between instances</title>
          <style type="text/css">
               @namespace xf url("http://www.w3.org/2002/xforms");
               body {font-family:Helvetica, sans-serif}
               #source-repeat {border: blue solid 1px;}
               #destination-repeat {border: green solid 1px;}
          </style>
          <xf:model>
 
               <xf:instance xmlns="" id="source">
                    <data>
                         <a>A1</a>
                         <a>A2</a>
                         <a>A3</a>
                    </data>
               </xf:instance>
 
               <xf:instance xmlns="" id="destination">
                    <data/>
               </xf:instance>
 
          </xf:model>
     </head>
     <body>
          <h1>Example of deep copy using XForms insert origin</h1>
 
          <h3>Source:</h3>
          <xf:repeat id="source-repeat" nodeset="instance('source')/a">
               <xf:output ref="."/>
          </xf:repeat> 
 
          <h3>Destination:</h3>
          <xf:repeat id="destination-repeat" nodeset="instance('destination')/a">
               <xf:output ref="."/>
          </xf:repeat> 
 
          <xf:trigger>
               <xf:label>Copy data from source to destination</xf:label>     
               <xf:action ev:event="DOMActivate">
                        <xf:insert
                             origin="instance('source')"                        
                             nodeset="instance('destination')"/>
               </xf:action>
          </xf:trigger>
 
     </body>
</html>


[edit] Discussion

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