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#378 JavaScript error using table.deleteRow() and insertRow()
A JavaScript error occurs when the combination of
table.deleteRow() and table.insertRow() is used. The
deleteRow statement is nested in a while loop where
"table.rows.length > 0" controls the looping. The
insertRow statement must have at least 2 rows to insert
in order to see the exception. And finally, this will
only occur on the 2nd call (onclick events used below)
from the page. The first call succeeds.
This scenario makes me think that a variable (an index
is what the JavaScript exception mentions briefly
below) is not being properly reset.
The HTML page and Canoo WebTest script are below.
NOTE: I've checked out and tested with the latest trunk
changes.
========== WebTest Output =========
C:\canoo-webtest>bin\webtest.bat -f tests\test1.xml
"C:/java/jdk1.5.0_07\bin\java.exe" -Xms64M -Xmx256M -cp
"C:\canoo-webtest\bin..\lib\ant-launcher.jar"
-Dant.library.dir="C:\canoo-webtest\bin..\lib"
org.apache.tools.ant.launch.Launcher -nouserlib -lib
"C:\canoo-webtest\bin..\lib\build;C:\canoo-webtest\bin..\lib\build\clover.jar"
-f tests\test1.xml
Buildfile: tests\test1.xml
main:
Overriding previous definition of reference to
ant.PropertyHelper
Overriding previous definition of reference to
ant.PropertyHelper
BUILD FAILED
C:\canoo-webtest\tests\test1.xml:11: Canoo Webtest: R_1408.
Test failed.
Exception raised:
com.canoo.webtest.engine.StepExecutionException:
Unexpected exception caught:
com.gargoylesoftware.htmlunit.ScriptException: Index or
size is negative or greater than the allowed amount
(index: 1, 0 rows) (Embedded script in
http://localhost/test.html#10), Step: SetCheckbox at
C:\canoo-webtest\tests\test1.xml:34: with
(taskName="setCheckbox")com.canoo.webtest.engine.StepExecutio
nException: Unexpected exception caught:
com.gargoylesoftware.htmlunit.ScriptException: Index or
size is negative or greater than the allowed amount
(index: 1, 0 rows) (Embedded script in
http://localhost/test.html#10), Step: SetCheckbox
at
C:\canoo-webtest\tests\test1.xml:34: with
(taskName="setCheckbox")
at
com.canoo.webtest.steps.Step.handleUnexpectedException(Step.java:427)
at
com.canoo.webtest.steps.AbstractBrowserAction.handleUnexpectedExcepti
on(AbstractBrowserAction.java:120)
at
com.canoo.webtest.steps.Step.execute(Step.java:115)
at
org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
at org.apache.tools.ant.Task.perform(Task.java:364)
at
com.canoo.webtest.ant.TestStepSequence.executeSteps(TestStepSequence.
java:43)
at
com.canoo.webtest.ant.TestStepSequence.doExecute(TestStepSequence.jav
a:31)
at
com.canoo.webtest.steps.Step.execute(Step.java:108)
at org.apache.tools.ant.Task.perform(Task.java:364)
at
com.canoo.webtest.ant.WebtestTask.execute(WebtestTask.java:164)
at
org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
at org.apache.tools.ant.Task.perform(Task.java:364)
at
org.apache.tools.ant.Target.execute(Target.java:341)
at
org.apache.tools.ant.Target.performTasks(Target.java:369)
at
org.apache.tools.ant.Project.executeSortedTargets(Project.java:1216)
at
org.apache.tools.ant.Project.executeTarget(Project.java:1185)
at
org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExe
cutor.java:40)
at
org.apache.tools.ant.Project.executeTargets(Project.java:1068)
at
org.apache.tools.ant.Main.runBuild(Main.java:668)
at
org.apache.tools.ant.Main.startAnt(Main.java:187)
at
org.apache.tools.ant.launch.Launcher.run(Launcher.java:246)
at
org.apache.tools.ant.launch.Launcher.main(Launcher.java:67)
Caused by:
com.gargoylesoftware.htmlunit.ScriptException: Index or
size is negative or greater than the allowed amount
(index: 1, 0 rows) (Embedded script in
http://localhost/test.html#10)
at
com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.callFunctio
n(JavaScriptEngine.java:307)
at
com.gargoylesoftware.htmlunit.html.HtmlPage.executeJavaScriptFunction
IfPossible(HtmlPage.java:737)
at
com.gargoylesoftware.htmlunit.html.HtmlPage.runEventHandler(HtmlPage.
java:1463)
at
com.gargoylesoftware.htmlunit.html.ClickableElement.click(ClickableEl
ement.java:103)
at
com.canoo.webtest.steps.form.SetCheckbox.setField(SetCheckbox.java:55
)
at
com.canoo.webtest.steps.form.AbstractSetFieldStep.doExecute(AbstractS
etFieldStep.java:152)
at
com.canoo.webtest.steps.Step.execute(Step.java:108)
... 19 more
Caused by: org.mozilla.javascript.EvaluatorException:
Index or size is negative or greater than the allowed
amount (index: 1, 0 rows) (Embedded script in
http://localhost/test.html#10)
at
com.gargoylesoftware.htmlunit.javascript.StrictErrorReporter.runtimeE
rror(StrictErrorReporter.java:114)
at
org.mozilla.javascript.Context.reportRuntimeError(Context.java:966)
at
org.mozilla.javascript.Context.reportRuntimeError(Context.java:1022)
at
com.gargoylesoftware.htmlunit.javascript.host.RowContainer.jsxFunctio
n_insertRow(RowContainer.java:152)
at
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at
org.mozilla.javascript.MemberBox.invoke(MemberBox.java:142)
at
org.mozilla.javascript.FunctionObject.call(FunctionObject.java:405)
at
org.mozilla.javascript.Interpreter.interpretLoop(Interpreter.java:308
4)
at
org.mozilla.javascript.Interpreter.interpret(Interpreter.java:2250)
at
org.mozilla.javascript.InterpretedFunction.call(InterpretedFunction.j
ava:149)
at
org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:3
37)
at
org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:275
5)
at
org.mozilla.javascript.InterpretedFunction.call(InterpretedFunction.j
ava:147)
at
com.gargoylesoftware.htmlunit.javascript.host.EventHandler.call(Event
Handler.java:95)
at
com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.callFunctio
n(JavaScriptEngine.java:302)
... 25 more
Total time: 2 seconds
========== WebTest FILE =========
<?xml version="1.0"?>
<!DOCTYPE project SYSTEM "WebTest.dtd"
>
<project name="Testing 1.2.3" basedir="." default="main">
<property name="webtest.home" location="C:\\canoo-webtest"/>
<import file="${webtest.home}/lib/taskdef.xml"/>
<target name="main">
<webtest name="myTest">
<config host="localhost" port="80" protocol="http" summary="true" saveresponse="true" autorefresh="true" haltonerror="true" haltonfailure="true"/>
<steps>
<invoke url="test.html"/>
<verifyTitle text="Testing"/>
<setCheckbox htmlid="myCheckbox" checked="true"/>
<verifyXPath xpath="id('myTable')/tbody/tr<span>[2]</span>/td<span>[2]</span>" text="NEW CELL1-1"/>
<setCheckbox htmlid="myCheckbox" checked="false"/>
<verifyXPath xpath="id('myTable')/tbody/tr<span>[2]</span>/td<span>[2]</span>" text="NEW CELL1-1"/>
</steps>
</webtest>
</target>
</project>
=================================
=========== HTML FILE ===========
<HTML>
<HEAD>
<TITLE>Testing</TITLE>
</HEAD>
<BODY>
<script language="javascript">
function insertRowToTable() {
var tbl = document.getElementById("myTable");
// clear the table (without this, no exception is
thrown)
while (tbl.rows.length > 0)
tbl.deleteRow(0);
// repopulate the table
for (var i=0; i < 2; i++) {
var row = tbl.insertRow(i); //Exception thrown here
but only on 2nd loop
for (var j=0; j < 2; j++) {
var cell = row.insertCell(j);
cell.innerHTML = "NEW CELL" + j + "-" + i;
}
}
}
</script>
<H1>Test</H1>
<INPUT TYPE="checkbox" ID="myCheckbox" NAME="myCheckbox" ONCLICK="insertRowToTable()"/>
<TABLE ID="myTable" BORDER="1">
</TABLE>
<FONT SIZE="-2">Note: ONCLICK event for checkbox
above destroys and populates table.<BR>
JavaScript Exception in HtmlUnit is thrown on the
second click but only when the table.deleteRow() "while
loop" is called before. (IE and FF behave
correctly.)</FONT>
</BODY>
</HTML>
=================================
Logged In: YES
user_id=402164
This was a bug in insertRow when the table already contains
a tbody which is empty.
Now fixed in SVN.