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The Range.compareBoundaryPoints() method compares the boundary points of the Range with another one.

Syntax

compare = range.compareBoundaryPoints(how, sourceRange);

Return value

compare
A number, -1, 0, or 1, indicating whether the corresponding boundary-point of the Range is respectively before, equal to, or after the corresponding boundary-point of sourceRange.

Parameters

how
A constant describing the comparison method:
  • Range.END_TO_END compares the end boundary-point of sourceRange to the end boundary-point of Range.
  • Range.END_TO_START compares the end boundary-point of sourceRange to the start boundary-point of Range.
  • Range.START_TO_END compares the start boundary-point of sourceRange to the end boundary-point of Range.
  • Range.START_TO_START compares the start boundary-point of sourceRange to the start boundary-point of Range.

If the value of the parameter is invalid, a DOMException with a NOT_SUPPORTED_ERR code is thrown.

sourceRange 
A Range to compare boundary points with the range.

Example

var range, sourceRange, compare;
range = document.createRange();
range.selectNode(document.getElementsByTagName("div")[0]);
sourceRange = document.createRange();
sourceRange.selectNode(document.getElementsByTagName("div")[1]);
compare = range.compareBoundaryPoints(Range.START_TO_END, sourceRange);

Specifications

Specification Status Comment
DOM
The definition of 'Range.compareBoundaryPoints()' in that specification.
Living Standard No change.
Document Object Model (DOM) Level 2 Traversal and Range Specification
The definition of 'Range.compareBoundaryPoints()' in that specification.
Obsolete Initial specification.

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
compareBoundaryPointsChrome Full support YesEdge Full support 12Firefox Full support 4IE Full support 9Opera Full support 9Safari Full support YesWebView Android Full support YesChrome Android Full support YesFirefox Android Full support 4Opera Android Full support YesSafari iOS Full support YesSamsung Internet Android ?

Legend

Full support  
Full support
Compatibility unknown  
Compatibility unknown

See also

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