Tutorial: Realizziamo una chat per il nostro sito (Lesson 2)

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Cominciamo la nostra seconda lezione sulla creazione di una piccola chat da inserire in un box del nostro sito web, spiegando a cosa servono le righe di comando che abbiamo utilizzato nell’Action Script del pulsante Invia.

 

L’azione:

 

loadVariablesNum (“resp.asp”, 0, “POST”);

 

da l’avvio al inserimento del nuovo messaggio, effettua il refresh dei messaggi e pulisce il nostro campo di testo per inserire i nuovi messaggi.

Lo script di resp.asp, va comunque inserito in codice. Di seguito vedremo l’inserimento effettuato con i commenti per capire meglio passo passo cosa stiamo facendo:

<%
Dim strLinea, FileObject, Instream, intVisite, intTipo, OutStream, i, k, arrMsg(100), fine, allMsg
‘questa stringa permette l’utilizzo semplice in visualizzazione di : “username _ messaggio”
stringa = Trim(Request(“stringa”))
strFile = Server.MapPath(“msg.txt”)
‘ definiamo l’oggetto creato in questo caso i messaggi che andranno in un file di testo
Set FileObject = Server.CreateObject(“Scripting.FileSystemObject”)
‘faccio la lettura del file
intTipo = 1 ‘ lettura
Set InStream = FileObject.OpenTextFile(strFile,IntTipo,true)
‘inseriamo il valore di data e ora al messaggio per fare in modo che in ordine cronologico siano aggiunti nella lista
i = 0
arrMsg(i) = FormatDateTime(Now(),3)&” – “&stringa
‘leggiamo il file di testo ed inseriamo i messaggi
Do While not InStream.AtEndOfStream
StrLinea = InStream.ReadLine()
i=i+1
arrMsg(i) = StrLinea
Loop
Set OutStream = FileObject.CreateTextFile(strFile, true)
‘determiniamo il numero massimo di messaggi
if i>15 then
fine=15
else
fine=i
end if
k=0
‘visualizziamo in Flash i messaggi inserendo il (br) a capo dove necessario
Do While k<=fine
OutStream.WriteLine(arrMsg(k))
allMsg=allMsg&arrMsg(k)&”<br />”
k=k+1
Loop
OutStream.Close
Set OutStream = Nothing
InStream.Close
Set InStream = Nothing
Set FileObject = Nothing
‘inviamo definitivamente i messaggi alla chat
Response.Write(“corpo=”&allMsg)
%>

Ecco, così abbiamo inserito il codice alla nostra chat e potremmo utilizzarla in modalità standard per dare la possibilità agli utenti del vostro sito di scambiare due chiacchiere. Ricordiamo che la versione utilizzata per la realizzazione di questo tutorial è l’ActionScript 4 incluso nella suite Adobe Macromedia Flash CS4 Professional.

Nella prossima ed ultima lezione, vedremo come dare un “tocco di colore” alla nostra chat.

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