$("*:not(:has(*))") causes crash

[jDramaix]

Original author: dewi.jo...@gmail.com (November 03, 2011 07:14:41)

What steps will reproduce the problem?

1. Create a gQuery object with the selection $(":not(:has())")

What is the expected output? What do you see instead? A valid Gquery object containing all elements which do not have descendents. This is what I see instead in Eclipse:

Created HasSelector: com.google.gwt.query.client.impl.SelectorEngineCssToXPath Created SelectorEngineImpl: com.google.gwt.query.client.impl.SelectorEngineNative Created DocumentStyleImpl: com.google.gwt.query.client.impl.DocumentStyleImpl ERROR SelectorEngineNative (NS_ERROR_DOM_SYNTAXERR): An invalid or illegal string was specified :not(:has()), falling back to SelectorEngineCssToXPath ERROR: xpathEvaluate invalid xpath expression:.//[not(.//:has() css-selector::not(:has(_))

com.google.gwt.core.client.JavaScriptException: (NS_ERROR_DOM_INVALID_EXPRESSION_ERR): The expression is not a legal expression. at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:248) at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136) at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:561) at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:269) at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91) at com.google.gwt.query.client.impl.SelectorEngine.xpathEvaluate(SelectorEngine.java) at com.google.gwt.query.client.impl.SelectorEngineCssToXPath.select(SelectorEngineCssToXPath.java:225) at com.google.gwt.query.client.impl.SelectorEngineNative.select(SelectorEngineNative.java:70) at com.google.gwt.query.client.impl.SelectorEngine.select(SelectorEngine.java:138) at com.google.gwt.query.client.GQuery.select(GQuery.java:3708) at com.google.gwt.query.client.GQuery.$(GQuery.java:291) at com.google.gwt.query.client.GQuery.$(GQuery.java:259)

What version of the product are you using? On what operating system? gQuery 1.1.0

Please provide any additional information below. Firefox and GWT 2.4 in Linux.

Original issue: http://code.google.com/p/gwtquery/issues/detail?id=112

[jDramaix]

From manuel.carrasco.m on November 03, 2011 11:17:40

:has selector is not implemented yet in gquery, it is not a valid css selector, in jquery it is an extension: http://api.jquery.com/has-selector/

We will implement it in a future release, in the meanwhile use gquery methods as a workaround. $("").not($("").has("*"));

The gquery implementation will delegate on these methods as jquery does, so :has cannot take advance of css native selector performance.

[manolo]

We will not implement 'has' pseudo.

'has' implementation in gQuery will reduce performance of other selectors also implies introduce GQuery dependency inside Selector engine.

Since there is a workaround, we prefer gquery users wanting to use the 'has' pseudo-selector to use $("").not($("").has("*")); instead of penalizing all.