Stefan Bauer created WICKET-7160:
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Summary: WicketTester: onchange AJAX behavior broken for
DropDownChoice when page has a request parameter with the same name as the id
of the DropDownChoice
Key: WICKET-7160
URL: https://issues.apache.org/jira/browse/WICKET-7160
Project: Wicket
Issue Type: Bug
Affects Versions: 9.21.0
Reporter: Stefan Bauer
Attachments: bug.zip
h5. Steps to reproduce
(see code example below)
* in a Page that was instantiated using request parameters...
* have a DropDownChoice whose Wicket ID is identical to the name of one of the
request paameters...
* add a AJAX onchange behavior...
* and then try to trigger this behavior using the WicketTester
h5. Expected Result
(see code example below)
* onchange behavior is triggered with the correct value
h4. Actual Result
* onchange behavior is triggered, but the value is null
h4. Code example
(Full source attached)
{code:java}
public class DemoPage extends WebPage {
public DemoPage(PageParameters parameters) {
super(parameters);
}
@Override
protected void onInitialize() {
super.onInitialize();
Form<String> form = new Form<>("form");
DropDownChoice<String> select = new DropDownChoice<>(
"select",
new Model<>(),
List.of("Choice 1", "Choice 2"));
select.add(OnChangeAjaxBehavior.onChange(target -> {
System.out.println("Selected choice changed to: " +
select.getModelObject());
}));
form.add(select);
add(form);
}
} {code}
{code:java}
public class DemoPageTest {
@ParameterizedTest
@ValueSource(strings = { "select", "somethingElse" })
void testOnChangeAjaxBehavior(String requestParameterName) {
// ARRANGE
WicketTester tester = new WicketTester();
tester.startPage(DemoPage.class, new
PageParameters().add(requestParameterName, "23"));
// ACT
FormTester formTester = tester.newFormTester("form");
formTester.select("select", 1);
tester.executeAjaxEvent("form:select", "change");
// ASSERT
tester.assertModelValue("form:select", "Choice 2");
}
} {code}
h4. Background
This does not happen when the page is acutally run on a real servlet container,
e.g. Jetty.
As far as I can see, this is related to the POST request that the WicketTester
creates for triggering the onchange AJAX behavior. Given the Wicket ID of the
DropDownChoice is "select", in production, the request looks something like
this:
URL: /page?1-1.0-form-select&select=23
Body: select=1
But in WicketTester, the request looks like this (if I debugged this correctly)
URL: /page?1-1.0-form-select&select=23&select=1
Body: (empty)
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