Range.compareNode() - Web APIs 编辑

Non-standard

This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

Obsolete since Gecko 1.9 (Firefox 3)

This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.

The Range.compareNode() returns a constant indicating the position of the Node.

The possible values are:

NODE_BEFORE (0)

Node starts before the Range

NODE_AFTER (1)

Node ends after the Range

NODE_BEFORE_AND_AFTER (2)

Node starts before and ends after the Range

NODE_INSIDE (3)

Node starts after and ends before the Range, i.e. the Node is completely selected by the Range.

Warning: This method has been removed from Gecko 1.9 and will not exist in future versions of Firefox, which was the only browser implementing it; you should switch to Range.compareBoundaryPoints() as soon as possible.

The following function can be used as replacement:

function rangeCompareNode(range, node) {
  var nodeRange = node.ownerDocument.createRange();
  try {
    nodeRange.selectNode(node);
  }
  catch (e) {
    nodeRange.selectNodeContents(node);
  }
  var nodeIsBefore = range.compareBoundaryPoints(Range.START_TO_START, nodeRange) == 1;
  var nodeIsAfter = range.compareBoundaryPoints(Range.END_TO_END, nodeRange) == -1;

  if (nodeIsBefore && !nodeIsAfter)
    return 0;
  if (!nodeIsBefore && nodeIsAfter)
    return 1;
  if (nodeIsBefore && nodeIsAfter)
    return 2;

  return 3;
}

Syntax

returnValue = range.compareNode( referenceNode );

Parameters

referenceNode

The Node to compare with the Range.

Example

range = document.createRange();
range.selectNode(document.getElementsByTagName("div").item(0));
returnValue = range.compareNode(document.getElementsByTagName("p").item(0));

Notes

This method is obsolete; you should use the W3C DOM Range.compareBoundaryPoints() method.

Specifications

This method is not standard and therefore not part of any specification.

Browser compatibility

BCD tables only load in the browser

See also

• The DOM interfaces index