You may at some point need to have simple conditions in your tapestry view.
Tapestry 5.1 use this version
<html xmlns:t="http://tapestry.apache.org/schema/tapestry_5_1_0.xsd" xmlns:p="tapestry:parameter">
<t:if test="loggedIn">
Hello, ${userName}!
<p:else>
Click <a t:type="actionlink" t:id="login">here</a> to log in.
</p:else>
</t:if>
</html>
Older versions of Tapestry 5 use this version
<html xmlns:t="http://tapestry.apache.org/schema/tapestry_5_1_0.xsd">
<t:if test="loggedIn">
Hello, ${userName}!
<t:parameter name="else">
Click <a t:type="actionlink" t:id="login">here</a> to log in.
</t:parameter>
</t:if>
</html>
Posts
hahaha I was looking for the code to add an "else" in a tapestry 5 "if" clause and your page was the first hit in google.
ReplyDeleteYOU'RE FAMOUS!!!
Hi
ReplyDeleteThanks for the tips. But I get a question. Why the prefix in else condition uses p instead of t, which is normally used by other tag e.g. t:if?
Thanks again for the post,
This tips saves my time.
Hi,
ReplyDeleteI need to customize a file upload field (sometimes I want it to be required, sometimes not)
In order to do so, I have tried to use the conditionnal syntax you mentionned :
≤i≥
≤t:if test="fileExists"≥
≤input t:type="upload" t:id="file" /≥
≤p:else≥
≤input t:type="upload" t:id="file" validation="required" /≥
≤/p:else≥
≤/t:if≥
≤/i≥
Unfortunnately, this syntax generates the following error :
already contains a child component with id 'file'. Embedded component ids must be unique (excluding case, which is ignored).
It sounds like a tapestry's bug (regarding syntax checking) : in fact there is no duplicated id, as there is an exclusion between those 2 blocks.
Do u have any idea of a workaround?
Thanks
Regards
Emmanuel