Ask you , form validation

Know Ask you , Quebec form validation yet.


this sentence, why was hmtl becomes
name = "method: add" >


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onclick = "return checkform ()"
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can use struts validation framework , or write your own js validation.
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s: submit encapsulates part of html element , in addition to increased struts2 some of their own features, such as backstage access form data when, with the set, get way !
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Thank floor . Also thank you for your answer .
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third floor of positive solutions, thanks to the third floor
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But I still do not understand how to increase this return mean ?
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But I still do not understand how to increase this return mean ?  

According checkform () return value is executed , returns true submission is not operated contrary