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Web Component Certification (OCEJWCD)

How to define multiple tag handlers

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posted 16 years ago

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Hi All,

I just tried to execute the example(Menu and MenuItem tag handlers) given on the page 543 in HFSJ first editon.

There two tag handlers are given:Menu and MenuItem..
But how to define these tag handlers in Tag Library Descriptor..Should i use seperate TLD for seperate tag handlers or only in one file should i give the both tag handlers..

Any link which provides how to deal with multiple tag handlers is of great help as these things are not explained in HFSJ

Thanks & Regards,
Sudhakar Karnati

Shikhar Madhok

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posted 16 years ago

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try this link

I think the general convention is one tld file per-prefix.
So say you define multiple tags specifically for menus then you would have one menu.tld and within it you would have definition for say mainMenu tag and subMenu tag and the usage in the jsp would be like menu:mainMenu or menu:subMenu.
If your application is not that big then you can have just a single tld file which would define all the custom tags in your application.

HTH
Shikhar

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Christophe Verré

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posted 16 years ago

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Should i use seperate TLD for seperate tag handlers or only in one file should i give the both tag handlers..

You can do both. If you use different TLDs, you'll also have to use different prefixes in your JSP. If you use only one TLD, yoう can use multiple <tag> tags in it.
[ July 09, 2008: Message edited by: Christophe Verre ]

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sudhakar karnati

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posted 16 years ago

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You can do both. If you use different TLDs, you'll also have to use different prefixes in your JSP. If you use only one TLD, yoう can use multiple <tag> tags in it.

I tried this but not getting the result:

Here is my code:

index.jsp

Simple.tld

Simple1.tld

Menu.java

MenuItem.java

Please tell me what is wrong in the above code..

Thanks & Regards,
Sudhakar Karnati

Christophe Verré

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posted 16 years ago

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With the parent's body content set to "tagdependent", I don't think that the inner tags will be evaluated. But there's a bigger problem : Menu's doEndTag is not spelled properly. doEndtag -> doEndTag
[ July 10, 2008: Message edited by: Christophe Verre ]

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Anand Bhatt

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posted 16 years ago

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Change:
<short-name>simple</short-name> in simple.tld
to
[bhort-name>Menu</short-name> [/b]

Anand Bhatt

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posted 16 years ago

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Please ignore my above post and consider this:
Change:
<short-name>simple</short-name> in simple.tld
to
<short-name>Menu</short-name>

Christophe Verré

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posted 16 years ago

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Anand, the short-name has no influence on the way the tag will be used.

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sudhakar karnati

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posted 16 years ago

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With the parent's body content set to "tagdependent", I don't think that the inner tags will be evaluated. But there's a bigger problem : Menu's doEndTag is not spelled properly. doEndtag -> doEndTag

I made the aove changes(tagdependent to scriptless) and it is working fine..
Thanks for your quick replies..

Thanks & Regards,
Sudhakar Karnati

Anand Bhatt

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posted 16 years ago

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Thanks Christophe , I was confused <short-name> with <name>.
You are correct.

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