I think I may have found a GWT bug. Please let me know if there is a
better place to post this...
Consider this code from a JSTL tag…
------------------------
<div id="existingFriendsAddressBook">
<ul>
<c:forEach items="${friends}" var="friend">
<c:set
var="friendEmail">${fn:toLowerCase(friend.email)}</c:set>
<li>
<input type="checkbox"
id="existingFriend_${friendEmail}" /> $
{friendEmail}
</li>
</c:forEach>
</ul>
</div>
------------------------
…and this GWT code, which tries to get a reference to each of the
checkboxes created in that tag…
------------------------
@Override
protected void build() {
DivElement existingFriendsAddressBook =
DivElement.as(DOM.getElementById
("existingFriendsAddressBook"));
UListElement list =
UListElement.as
(existingFriendsAddressBook.getFirstChildElement());
NodeList<Node> children = list.getChildNodes();
int numFriends = children.getLength();
for (int i = 0; i < numFriends; i++) {
LIElement row = LIElement.as((Element) children.getItem(i));
Element firstChild = row.getFirstChildElement();
InputElement checkbox = InputElement.as(firstChild);
String checkboxId = checkbox.getId();
[do stuff with checkboxId, unrelated to this post]
}
}
------------------------
It turns out that IN FIREFOX ONLY, the variable “firstChild” is
null, and I believe this is a bug in Element’s getFirstChildElement
(). I changed the code to the following, and there is no longer an
error…
------------------------
LIElement row = LIElement.as((Element) children.getItem(i));
NodeList<Node> subchildren = row.getChildNodes();
InputElement checkbox = InputElement.as((Element) subchildren.getItem
(0));
String checkboxId = checkbox.getId();
------------------------
A call to GWT.getVersion() returns "1.5.2"
As you can see, I have found a work-around, so this isn't urgent...
just a heads-up! :)
-Monkey Mike
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