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Using tag library to check if a object is null
Posted on 2004-04-08
I would like to use the tag library to see if the object is null.
The object is set in the session. In my JSP I get the object from the session.
The first thing i want to do is check if it is null- it it is nulll i print a message otherwise i go ahead and do some other stuff
this is what i have:
<logic:equal parameter="customers" value="null">
<B> Search string returned 0 records </B>
</logic:equal>
<logic:notEqual parameter="customers" value="null">
//DO HTML STUFF
</logic:notEqual>
I have a lot of HTML in my JSP - hece i did not use an if-else condition as it was tooconfusing.
Could someone help out with this or give me some info as to how i canuse if-else , i think i am messing up with the braces
thanks
The object is set in the session. In my JSP I get the object from the session.
The first thing i want to do is check if it is null- it it is nulll i print a message otherwise i go ahead and do some other stuff
this is what i have:
<logic:equal parameter="customers" value="null">
<B> Search string returned 0 records </B>
</logic:equal>
<logic:notEqual parameter="customers" value="null">
//DO HTML STUFF
</logic:notEqual>
I have a lot of HTML in my JSP - hece i did not use an if-else condition as it was tooconfusing.
Could someone help out with this or give me some info as to how i canuse if-else , i think i am messing up with the braces
thanks
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2 Comments
use logic:present, not logic:equal
<logic:present parameter="customer">
<B> Search string returned 0 records </B>
</logic:present>
<logic:notPresent parameter="customers">
//DO HTML STUFF
</logic:notPresent>
<logic:present parameter="customer">
<B> Search string returned 0 records </B>
</logic:present>
<logic:notPresent parameter="customers">
//DO HTML STUFF
</logic:notPresent>
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