Category Archives: Web Development

ExtJS usando tags para JEE

Acabou a desculpa de por não conhecer bem javascript, não usar o melhor Framework Ajax da atualidade.

Agora voce pode usar tags nos seus JSPs que habilitam os componentes do ExtJS.

Fonte: http://www.exttld.com/

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Tutoriais de Javascript

Material excelente no site http://eloquentjavascript.net/

Contents

  1. Introduction
  2. Basic JavaScript: values, variables, and control flow
  3. Functions
  4. Data structures: Objects and Arrays
  5. Error Handling
  6. Functional Programming
  7. Searching
  8. Object-oriented Programming
  9. Modularity
  10. Regular Expressions
  11. Web programming: A crash course
  12. The Document-Object Model
  13. Browser Events
  14. HTTP requests

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Quando o IE trabalha corretamente…

… e o Firefox não!

Hoje conversando com Rafael Ponte sobre um problema que ele estava enfrentando (em um sistema legado que ele dá manutenção) descobrimos que o IE esvazia todas as referências de um frame quando uma janela popup é fechada. Que é o correto, e o firefox não esvazia.

Isso para mim se caracteriza como um Memory Leak.

A situação era o seguinte:

  1. Existe uma tela “A” que contém uma table onde são adicionadas os itens;
  2. Existe um Popup que funciona como um filtro dos itens e devolve o item selecionado para a tela A anterior;

O problema específico era que a chamada window.opener.addMedico(json) no popup acrescentava um objeto (que chamo de json aqui) a uma variável global (um array) que funciona como cache na tela “A”. No IE quando o popup era fechado a referência desaparecia do array, no Firefox não.

Esse deveria ser o comportamento correto, imagina que eu fecho uma janela e as referências não são esvaziadas? Memory Leak quer queira ou não. Ter que esvaziar todas as referências manualmente se caracteriza sim como Memory Leak.

Desconsideram o uso de Popups em pleno ano da graça do nosso senhor de 2008, não comentem nada para não entristecer ainda mais nosso amigo Rafael. Agora que o pessoal vai começar a sofrer com legado WEB com tantos “escondidos.jsp“.

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