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posted 23 years ago

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Is there a way to pass an attribute without passing a value actually to it in the jsp file to the jsp tag. I just want to check whether it is null or not, basically make this optional.
Thanks,
Apreciate your help!

maha anna

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Posts: 1467

posted 23 years ago

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Mendy,
I came across this example in Marty Hall's book where the 'repts' atribute could be null if the user doesn't send from browser. Please take a look at. The 'RepeatTag.java' file's setReps method works intelligently when the incoming arg is null.

He just uses this HttpRequest object inside tag.

<csajsp:repeat reps='<%= request.getParameter("repeats") %>'>

To simulate null value to this attribute , don't pass any 'reps' parameter from the browser url.

Just http://localhost/yourappln/RepeatTag.jsp will do!
To pass some val http://localhost/yourappln/RepeatTag.jsp?reps=10

regds
maha anna

[This message has been edited by maha anna (edited March 30, 2001).]

mendy smith

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Posts: 19

posted 23 years ago

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Thanks maha anna for the suggestions!
My point is i don't want to pass a value to this reps attribute in my .jsp file. I want to check whether this attribute is present(null) or not. Can we do the following?
From your example:
------------------
//this is part of my .jsp file
<csajsp:repeat reps>
//set method in tag class
public void setReps(String reps)
{
}
Thanks,
Appreciate any further suggestions!

maha anna

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Posts: 1467

posted 23 years ago

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Mendy,
I checked your point. We can't just use the attribute name alone without any value!. We have to atleast specify '' OR "". IN other words, the following code is not allowed. When I tried with this code and called the jsp file from browser, got the famous 500 error

saying "attribute reps must hava a value"
regds
maha anna
// This code is illegal
<csajsp:repeat reps>
<LI><csajsp

rime length="40" />
</csajsp:repeat>
// This code is OK!
<csajsp:repeat reps=''>
<LI><csajsp

rime length="40" />
</csajsp:repeat>

[This message has been edited by maha anna (edited March 30, 2001).]

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