来自专栏 XForms · 第 71 篇，共 137 篇
Motivation
You want to add a new instance or element from a template. You want to do a deep copy of complex XML from one instance to another instance within a model.
Method
We will use the XForms 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.
Link to XForms Application
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>
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