Hamelin

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Domanda: per arrotondare un numero all'intero più vicino Javascript mette a disposizione la funzione Math.round ()
Ma se volessi arrotondare un numero decimale a un numero con n cifre dopo la virgola? (chiedo se esiste una funzione apposta... o se devo procedere altrimenti)

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Bjarne Stroustrup: "I have always wished for my computer to be as easy to use as my telephone; my wish has come true because I can no longer figure out how to use my telephone."
Andrew S. Tanenbaum: "Never underestimate the bandwidth of a station wagon full of tapes hurtling down the highway."
Edsger Dijkstra: "Computer Science is no more about computers than astronomy is about telescopes."
Robert Firth: "One of the main causes of the fall of the Roman Empire was that, lacking zero, they had no way to indicate successful termination of their C programs."
Donald Knuth: "A mathematical formula should never be 'owned' by anybody! Mathematics belong to God."

ripe

- up in the mountains -

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Hai ragione, c'è un modo per farlo con il metodo round, ma non è proprio il massimo dell'eleganza...

Ad esempio, per arrotondare il numero 15,456 ad una sola cifra decimale puoi fare:

n = Math.round(15,456 * 10) / 10

Così con la moltiplicazione sposti la virgola a destra e arrotondi con il round tutto il resto, mentre con la divisione riporti la virgola a sinistra al posto giusto e ottieni il risultato desiderato.

Cambiando il fattore di moltiplicazione o divisione ottieni le altre possibilità!

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«And if you ever smell christian blood up in the mountains, then get your axe and chop them down!»

Hamelin

.pifferaio.magico.

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Registered: Feb 2003
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Ok. Era quello a cui avevo pensato. Quindi mi confermi che non c'è alcuna funzione predefinita?

__________________
Bjarne Stroustrup: "I have always wished for my computer to be as easy to use as my telephone; my wish has come true because I can no longer figure out how to use my telephone."
Andrew S. Tanenbaum: "Never underestimate the bandwidth of a station wagon full of tapes hurtling down the highway."
Edsger Dijkstra: "Computer Science is no more about computers than astronomy is about telescopes."
Robert Firth: "One of the main causes of the fall of the Roman Empire was that, lacking zero, they had no way to indicate successful termination of their C programs."
Donald Knuth: "A mathematical formula should never be 'owned' by anybody! Mathematics belong to God."

ripe

- up in the mountains -

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Io ho usato sempre quel modo, non conosco altri metodi...

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«And if you ever smell christian blood up in the mountains, then get your axe and chop them down!»

Hamelin

.pifferaio.magico.

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Registered: Feb 2003
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Un altro quesito: il campo innerText di un oggetto dell'HTML DOM funziona solo per MS Internet Explorer... non c'è un metodo standard per modificare il contenuto di un elemento HTML (quello che sta tra i due tag)?
Grazie ancora!

__________________
Bjarne Stroustrup: "I have always wished for my computer to be as easy to use as my telephone; my wish has come true because I can no longer figure out how to use my telephone."
Andrew S. Tanenbaum: "Never underestimate the bandwidth of a station wagon full of tapes hurtling down the highway."
Edsger Dijkstra: "Computer Science is no more about computers than astronomy is about telescopes."
Robert Firth: "One of the main causes of the fall of the Roman Empire was that, lacking zero, they had no way to indicate successful termination of their C programs."
Donald Knuth: "A mathematical formula should never be 'owned' by anybody! Mathematics belong to God."

ripe

- up in the mountains -

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Uhm... non mi sono mai posto il problema... innerHTML con solo il testo specificato non funziona? Altrimenti puoi provare un nodeValue...

Anche se non è standard, preferisco il modello DOM di Internet Explorer...

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«And if you ever smell christian blood up in the mountains, then get your axe and chop them down!»

Hamelin

.pifferaio.magico.

User info:

Registered: Feb 2003
Posts: 662 (0.08 al dì)
Location: ..tra i monti intorno ad Hamelin..
Corso: Ingegneria Informatica
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Mah... sì... in fondo non è nemmeno molto utile...

__________________
Bjarne Stroustrup: "I have always wished for my computer to be as easy to use as my telephone; my wish has come true because I can no longer figure out how to use my telephone."
Andrew S. Tanenbaum: "Never underestimate the bandwidth of a station wagon full of tapes hurtling down the highway."
Edsger Dijkstra: "Computer Science is no more about computers than astronomy is about telescopes."
Robert Firth: "One of the main causes of the fall of the Roman Empire was that, lacking zero, they had no way to indicate successful termination of their C programs."
Donald Knuth: "A mathematical formula should never be 'owned' by anybody! Mathematics belong to God."

Hamelin

.pifferaio.magico.

User info:

Registered: Feb 2003
Posts: 662 (0.08 al dì)
Location: ..tra i monti intorno ad Hamelin..
Corso: Ingegneria Informatica
Anno: 3°
Time Online: 7 Days, 7:19:55 [...]
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Curiosità...

Perché usando il metodo navigator.appCodeName ottengo 'Mozilla' per Internet Explorer?

__________________
Bjarne Stroustrup: "I have always wished for my computer to be as easy to use as my telephone; my wish has come true because I can no longer figure out how to use my telephone."
Andrew S. Tanenbaum: "Never underestimate the bandwidth of a station wagon full of tapes hurtling down the highway."
Edsger Dijkstra: "Computer Science is no more about computers than astronomy is about telescopes."
Robert Firth: "One of the main causes of the fall of the Roman Empire was that, lacking zero, they had no way to indicate successful termination of their C programs."
Donald Knuth: "A mathematical formula should never be 'owned' by anybody! Mathematics belong to God."

ripe

- up in the mountains -

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Location: Cinisellooo
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Perchè IE si registra in questa classe di browser... anche Asp.Net restituisce questo valore:

Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322)

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«And if you ever smell christian blood up in the mountains, then get your axe and chop them down!»

Hamelin

.pifferaio.magico.

User info:

Registered: Feb 2003
Posts: 662 (0.08 al dì)
Location: ..tra i monti intorno ad Hamelin..
Corso: Ingegneria Informatica
Anno: 3°
Time Online: 7 Days, 7:19:55 [...]
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C'è la possibilità di nascondere in qualche modo il sorgente di un programmino scritto in Javascript?

...è che ho fatto un piccolo quiz... e non vorrei che le risposte siano visibili a tutti... se può ffa?

__________________
Bjarne Stroustrup: "I have always wished for my computer to be as easy to use as my telephone; my wish has come true because I can no longer figure out how to use my telephone."
Andrew S. Tanenbaum: "Never underestimate the bandwidth of a station wagon full of tapes hurtling down the highway."
Edsger Dijkstra: "Computer Science is no more about computers than astronomy is about telescopes."
Robert Firth: "One of the main causes of the fall of the Roman Empire was that, lacking zero, they had no way to indicate successful termination of their C programs."
Donald Knuth: "A mathematical formula should never be 'owned' by anybody! Mathematics belong to God."

ripe

- up in the mountains -

User info:

Registered: Jun 2002
Posts: 9469 (1.10 al dì)
Location: Cinisellooo
Corso: TICO TICO
Anno: Primo
Time Online: 61 Days, 2:33:39 [...]
Status: Offline

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Prova con un obfuscator, ne troverai anche qualcuno gratis!

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«And if you ever smell christian blood up in the mountains, then get your axe and chop them down!»