Блин как?
Экст сам их отправляет таким образом.
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Цитата:
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Ext.Ajax.request :
File uploads are not performed using normal "Ajax" techniques, that is they are not performed using XMLHttpRequests. Instead the form is submitted in the standard manner with the DOM <form> element temporarily modified to have its target set to refer to a dynamically generated, hidden <iframe> which is inserted into the document but removed after the return data has been gathered.
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