javascript with a less than character ("<") fails to execute when added through
a header contribution in ajax response
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Key: WICKET-3420
URL: https://issues.apache.org/jira/browse/WICKET-3420
Project: Wicket
Issue Type: Bug
Components: wicket
Affects Versions: 1.4.15
Environment: Validated this bug on my dev environment: Windows 7 64
bit using Firefox 4.0beta10 and Chrome 8.
Reporter: Randy Schnedler
Priority: Minor
This is adapted from a wicket users post I made (links are to the same thread
in two archive systems):
http://markmail.org/search/?q=wicket%20users%20wicket-ajax.js#query:wicket%20users%20wicket-ajax.js+page:1+mid:rfts3ar3upffhbbt+state:results
http://mail-archives.apache.org/mod_mbox/wicket-users/201102.mbox/%[email protected]%3E
The problem: I have a panel with this:
<wicket:head>
<script>
if (someVariable < 0) {
someVariable = 0;
}
</script>
</wicket:head>
This script fails to execute when the panel is loaded by ajax. If I replace
the less than character "<" with equals "==", then it executes (but of course,
this is not what I need).
I tested this in Firefox 4.0b10 and Chrome 8.
After some debugging, it seems to me that this needs to be corrected in
wicket-ajax.js. The header contribution is sent to the browser inside of a
CDATA section so the "<" character arrives to javascript intact. However, in
parsing the script tag, the "<" seems to signal the beginning of an HTML tag
that then is considered malformed.
Possible workarounds for apps:
- Invert the logic so a greater-than is used. In my example, this would be:
"if (0 > someVariable) {"
- Put the code into a separate JS file (the downside is it requires another
network hop from the browser)
- Embed the script in <wicket:panel> rather than <wicket:head> (the
disadvantage is the script will be re-sent with the panel content when the
panel is re-used on the same page)
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