MarkLogic 10 Product Documentationxdmp.nodeReplace
xdmp.nodeReplace( old as Node, new as Node ) as null
Summary
Replaces a node.
| Parameters | |
|---|---|
| old | The old node, to be replaced. |
| new | The new node. |
Usage Notes
Attribute nodes cannot be replaced by non-attribute nodes. Non-attribute nodes cannot be replaced by attribute nodes. Element nodes cannot have document node children. Document nodes cannot have multiple roots.If the caller of the function uses function mapping and $old
is an empty sequence, the node-replace function may return an
empty sequence. It will not return an error.
Example
// assume /foo.json is {"foo":"some value"}
declareUpdate();
var doc = cts.doc("/foo.json");
var docObj = doc.toObject();
docObj.foo = "this is a different value";
xdmp.nodeReplace(doc, docObj);
// now /foo.json will look like: {"foo":"this is a different value"}
Example
// create an XML document
declareUpdate();
xdmp.documentInsert("/example.xml", fn.head(xdmp.unquote(
'<a><b>bbb</b></a>')));
******
// replace the b node with a c node
declareUpdate();
var n = new NodeBuilder();
// create a <c>ccc</c> node
node = n.addElement("c", "ccc").toNode();
xdmp.nodeReplace(cts.doc("/example.xml").xpath("/a/b"), node);
******
// look at the new document
cts.doc("/example.xml");
=>
<?xml version="1.0" encoding="UTF-8"?>
<a><c>ccc</c></a>
Example
// This example shows how to update the root
// node of a text format document. Start by
// creating a text document.
declareUpdate();
var n = new NodeBuilder();
node = n.addText("This is a line of text.").toNode();
xdmp.documentInsert("/mydir/doc.txt", node);
******
// Update the text node of the text document
// by appending another line of text to the
// text node. Note that the text node is the
// root node of a text document.
declareUpdate();
var newText = fn.concat(cts.doc("/mydir/doc.txt"), "\n\
This is another line of text.");
var n = new NodeBuilder();
node = n.addText(newText).toNode();
xdmp.nodeReplace(cts.doc("/mydir/doc.txt").xpath("/text()"), node);
*****
// look at the updated document
cts.doc("/mydir/doc.txt")
=>
This is a line of text.
This is another line of text.
Example
// create a document
declareUpdate();
xdmp.documentInsert("/foo.json", {"foo":"this is a value"});
******
// replace the value using xdmp.nodeReplace
declareUpdate();
var n = new NodeBuilder();
node = n.addText("this is a different value").toNode();
xdmp.nodeReplace(cts.doc("/foo.json").xpath("/foo"), node);
******
// show the new doc
cts.doc("/foo.json");
=>
{"foo":"this is a different value"}