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Re: Debug ipad

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On 15/12/2020 2:20 pm, Thomas 'PointedEars' Lahn wrote:
> Andrew Poulos wrote:
> 
>> On 15/12/2020 10:42 am, Evertjan. wrote:
>>> Andrew Poulos <ap_prog@hotmail.com> wrote on 15 Dec 2020 in
>>> comp.lang.javascript:
>>>> I don't own a Mac and I've been shown bugs, in a website we built, that
>>>> only seem to happen on an ipad. I been given possession of the ipad and
>>>> can reproduce the errors but I don't know how to debug them.
>>> Wouldn't that be browser-dependent, rather than device or o.s. dependent?
>>
>> Yes, that's what I was expecting but there are bugs that only happen
>> when the site is viewed on an ipad.
> 
> "ipad" is not a browser.  Find out with which browser the problem occurs,
> then you can be advised better.

The bugs appear in the ipad's default Safari browser and in Chrome.

>>>> I added some code that will alert when an JavaScript error is triggered
>>>> but on the ipad it fails silently.
>>>
>>> What does that mean 'an JavaScript error is triggered'?
>>>
>>> Can you write code for that? I doubt that, please show relevant code.
>>
>> I use this to display errors:
>>
>> window.onerror = function (msg, url, lineNo, columnNo, error) {
>>     let message = [
>>         'Message: ' + msg,
>>         'URL: ' + url,
>>         'Line: ' + lineNo,
>>         'Column: ' + columnNo,
>>         'Error object: ' + JSON.stringify(error)
>>       ].join(' - ');
>>
>>     window.alert(message);
>> };
> 
> If window.error works in that case, probably window.alert(…) is disabled in
> the “error” event listener as it is not triggered by a user interaction.
> In that case you can instead

Dang, I forgot that that can happen.

> - send the error message to your server via XHR/Fetch;

It's not for users so I'll send it to the server.

> - append the error message to the Web site
>    · for users to copy it
>    · for users to send it to you in an e-mail; use something like
>   
>        window.location = 'mailto:your.email@address.example'
>          + ?subject=error'
>          + '&body=' + encodeURIComponent(errorMessage);
> 
>      in the event listener of a widget that you generate then.
> 
> Otherwise you could wrap your entire code in
> 
>    try
>    {
>      /* … */
>    }
>    catch (e)
>    {
>      /* or similar */
>      window.alert('…')
>    }
> 
> but probably only for debugging purposes (you could give the user a debug
> link with a token that must match for this to happen, so as to not
> compromise your app or your server).

Andrew Poulos

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Thread

Debug ipad Andrew Poulos <ap_prog@hotmail.com> - 2020-12-15 10:27 +1100
  Re: Debug ipad "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2020-12-15 00:42 +0100
    Re: Debug ipad Andrew Poulos <ap_prog@hotmail.com> - 2020-12-15 11:33 +1100
      Re: Debug ipad Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2020-12-15 04:20 +0100
        Re: Debug ipad Andrew Poulos <ap_prog@hotmail.com> - 2020-12-15 14:56 +1100
          Re: Debug ipad Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2020-12-15 13:29 +0100
            Re: Debug ipad Andrew Poulos <ap_prog@hotmail.com> - 2020-12-16 10:45 +1100
              Re: Debug ipad Andrew Poulos <ap_prog@hotmail.com> - 2020-12-16 11:14 +1100
  Re: Debug ipad Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2020-12-15 03:48 +0100
  Re: Debug ipad Arno Welzel <usenet@arnowelzel.de> - 2020-12-19 13:09 +0100

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