[WICKET-2812] Textarea ignores first line in case of blank line

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.4.5
• Fix Version/s: 1.5-M1
• Component/s: wicket
• Labels: blank_line textarea
• Environment: IE6 / FF3.6 / Opera9
• Assignee: Igor Vaynberg
• Reporter: Rutger Jansen
• Created: 31/Mar/10 09:08
• Updated: 25/Jul/10 09:10
• Resolved: 23/Jul/10 15:52

Description

When the content of a textarea starts with an empty line, this line disappears when it is placed in the html.
This is a known problem with the html textarea element.
<textarea>test</textarea> will result in the same as:
<textarea>
test</textarea>
Meaning that the first newline in the textarea is ignored. In case of opening a page with a textarea with a leading blank line, this line will be removed when the form is submitted again.

See for similar issues in the apache jira STR-1366 and BEEHIVE-1005

A possible solution is to change the following method in org.apache.wicket.markup.html.form.TextArea in something like:
protected final void onComponentTagBody(final MarkupStream markupStream, final ComponentTag openTag) {
checkComponentTag(openTag, "textarea");
String value = getValue();
if (value != null && value.startsWith("\n"))

{ value = "\n" + value; }

else if (value != null && value.startsWith("\r\n"))

{ value = "\r\n" + value; }

else if (value != null && value.startsWith("\r"))

{ value = "\r" + value; }

replaceComponentTagBody(markupStream, openTag, value);
}