Makoto Hashimoto

Just for fun!

February 1st, 2011

Tratando erros com Ajax e VRaptor

Uncategorized, VRaptor, by makoto.

Esse post foi motivado pela forma não elegante que eu estava tratando as exceções em requisições ajax em minhas aplicações com VRaptor.

Sempre que eu fazia uma requisição ajax e precisava de tratar um erro acabava fazendo de uma forma bem procedural. Utilizava o retorno do callback do ajax e verificava se pharmacyonline-bestcheap.com o retorno era um erro cialis online ou o dado esperando. Mas isso está bem longe de ser uma forma elegante de se tratar erros, sem

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falar que para cada ocasião é necessário verificar se o dado é erro cialis shelf life ou não de forma viagra y alcohol diferente.

Então tive a ideia de não tratar mais o erro no controller e deixar para tratar no http://viagraonline-4rxpharmacy.com/ callback http://kamagrajelly100mg-store.com de erro do ajax, mas ai tive outro problema.

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Como ter mais de uma error page? Uma vez que a página de erro customizada para o usuário não seria muito útil para cialis pills for sale receber no callback de erro. Postei minha dúvida para a lista do VRaptor da Caelum order viagra online (caelum-vraptor@googlegroups.com) e o Lucas Cavalcante (@lucascs) me deu a idéia de fazer um interceptor com um try…catch e utilizar o accept do Header para saber se a requisição é ajax. Gostei da ideia, implementei e resolvi fazer este post.

A implementação foi bem fácil e tranquila. Primeiro criei um Interceptor que chamei de AjaxExceptionInterceptor.

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Reparem nas implementações dos métodos “accepts” e “intercept” exigidas pelo contrato da interface Interceptor.

Você verá que na implementação do método “accepts” é verificado se é uma chamada ajax pelo conteúdo do accept do Header.

E na implementação do método “intercept” foi colocado um try…catch e caso o controller lance uma excessão, a mesma será capturada e então é enviada uma resposta com a mensagem da exception e não o html padrão do tomcat ou algum outro customizado no web.xml.

O controller é implementado sem tratar as exceções ou lançando as exceções customizadas.

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E por último basta fazer a chamada ajax na página.

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Repare que agora temos um código mais elegante onde não precisamos verificar o retorno do callback de sucesso para saber se é um erro ou canada pharmacy safety o dado esperado. Agora usamos o callback de erro do $.ajax do jQuery para capturar o erro caso ele ocorra e dar o tratamento desejado.

Clique aqui para ver o projeto completo viagraonlinepharmacy-best.com que fiz com esse exemplo funcional no github.

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Responses to “Tratando erros com Ajax e VRaptor”

  1. Acho que vale como um pluginzinho para o vraptor-contrib hein?
    Muito boa a ideia

    Abraço

  2. Show de bola Guilherme, vou fazer sim!
    Abraços.

  3. Makoto,

    Muito legal seu exemplo, mas executando o caso do null, a mensagem de “código inválido” vem com caracteres estranhos no lugar da acentuação.
    Sabe o que pode ser?

    Um grande abraço
    Rodrigo Bisterço

    Rodrigo Bisterço at 28/03/2011 10:34 pm
  4. Valeu o toque Rodrigo. Eu acabei de corrigir e o código atualizado está no github. Para corrigir o problema bastou colocar o código abaixo no web.xml.

    br.com.caelum.vraptor.encoding
    UTF-8

    Abraços.

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