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Message from discussion posting from my iPhone... Problems with width of iPhone apps
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David Cann  
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 More options Jun 30 2007, 9:15 am
From: David Cann <davidjc...@gmail.com>
Date: Sat, 30 Jun 2007 06:15:09 -0700
Local: Sat, Jun 30 2007 9:15 am
Subject: Re: posting from my iPhone... Problems with width of iPhone apps
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Anybody else noticing that Safari keeps reloading pages when I return
to Safari after using other apps on the phone?  I suspect this is a
memory management issue, but it's very annoying and a bad user
experience on AJAX apps.  I ought to be able to keep several tabs open
in the background at all times and return to them right where I left
off.  When you refresh the page on most AJAX apps, you're returned to
the home page.

The slow JavaScript execution has really been bugging me, so I ran a
speed test here:

http://celtickane.com/projects/jsspeed.php

On my dual G5, I get about 430 milliseconds, but on my iPhone, I'm
consistently getting greater than 10,000 milliseconds!

It's clear now why their WWDC web app was so simple and really not web
2.0 or AJAX at all.  Considering these fairly serious flaws is giving
me hope that this is a temporary stop-gap measure on Apple's part
while they are (hopefully) working on a Cocoa-esque API for us.

-d

On Jun 30, 2:12 am, "Christopher Allen"

<Christoph...@iPhoneWebDev.com> wrote:
> On 6/29/07, David Cann <davidjc...@gmail.com> wrote:

> > safari is assuming an 800px width.  Anyone found a solution to this
> > yet?

> Since the iPhone does not have a "window", it has to decide what width
> to use when it first renders the page in the zoomed-out mode. By
> default it renders it in 980 pixels wide, which they said they found
> the be the best number for most web sites. My assumption is that this
> number was also picked as it is just a little over 3 times the width
> of the iPhone. (Note there is an exception, if you connect to a .mobi
> domain the iPhone defaults to a viewport of 320.)

> Often 980 is not the appropriate size -- for instance, some narrow
> pages (such as many single column word press blogs) will render with a
> huge amount of white space to the left and right. In theses cases, you
> can use a meta tag in the <head> to give the iPhone a hint as to what
> viewport size to use, for example <meta name="viewport"
> content="width=560" /> will render the initial window in a smaller
> width window.

> My belief is that for a web page to be considered iPhone "friendly"
> (as per my post athttp://groups.google.com/group/iphonewebdev/browse_thread/thread/b199...
> ) that a web page must have a meta viewport tag.

> If you give the hint <meta name="viewport" content="width=320" /> you
> will get no scaling which is appropriate for iPhone webapps. However,
> there is some question in my in my mind if this is the best technique,
> as if you are using the iPhone in horizontal orientation, the initial
> viewport will now be too narrow.

> Instead, you may be able to use one of the other choices for viewport,
> which in addition to height is
> initial-scale (first loaded scale), user-scalable (boolean),
> minimum-scale (default 0.25), maximum-scale (default 1.6).

> I think some experimentation is required as to what is the best
> approach. I suspect that something like <meta name="viewport"
> content="initial-scale=1.0" /> may be the best choice for iPhone
> webapps, as I think it will do the right thing at both orientations.

> I'd test this myself tonight, but because of an AT&T activation SNAFU,
> I'll not have my iPhone activated until tomorrow, so if someone else
> can test some of these viewports, I'd appreciate it.

> -- Christopher Allen


 
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