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Groups > comp.lang.javascript > #21065

Re: Multiple image preload construct?

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On 27.08.2013 16:02, Thomas 'PointedEars' Lahn wrote:
> That is awful code style for array iteration, in probably every language of
> the C family.  Consider this instead:

Oh, this is not C, this is ECMAScript in the JavaScript flavor, a 
dynamic language. Nothing is compiled, everything is interpreted. If you 
understand how interpreting works you would know this doesn't really 
matter (and in this case the bottleneck is not the loop).

> It makes more sense to append the object reference to the Array *after* the
> object is prepared:

Doesn't matter at all in this case. The Image element is a valid 
reference before src is set and image loading is an asynchrounous 
operation in JavaScript.

If its reference is kept in an array, object or as a variable does not 
matter at all as long as it is referenced.

Look at Image element as parent of data, not part of it.

> It is even questionable to have the Image instance references in an Array,
 > as then there is no random access to them, for example by name or ID.

I think you are forgetting that you can use the URL to identify which 
image has loaded if you need to reference its index.

> In your code you declare 3 global properties that should be avoided by using
> namespacing (for lack of a better word):

You are missing the point here. I am not providing a full working 
solution but an example. It's up to OP to modify and adopt to suit his 
needs.

 > Consider ...
 > You could also count upwards ...
 > Function expressions are widely supported by now ...
 > Using your way is only necessary with event-handler properties ...

I am not sure how any of this significantly improves anything (if at 
all), but thanks for your opinions.


-- 
Ken Fyrstenberg
Abdias Software
http://abdiassoftware.com/
(remove usenet- from address)

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Multiple image preload construct? Tuxedo <tuxedo@mailinator.com> - 2013-08-27 16:32 +0200
  Re: Multiple image preload construct? Tuxedo <tuxedo@mailinator.com> - 2013-08-27 17:06 +0200
  Re: Multiple image preload construct? Danny <dann90038@gmail.com> - 2013-08-27 10:29 -0700
  Re: Multiple image preload construct? Ken <usenet-so@abdiassoftware.com> - 2013-08-27 13:32 -0500
    Re: Multiple image preload construct? Tuxedo <tuxedo@mailinator.com> - 2013-08-27 20:54 +0200
      Re: Multiple image preload construct? Ken <usenet-so@abdiassoftware.com> - 2013-08-27 18:19 -0500
        Re: Multiple image preload construct? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-08-28 01:37 +0200
          Re: Multiple image preload construct? Ken <usenet-so@abdiassoftware.com> - 2013-08-27 18:47 -0500
    Re: Multiple image preload construct? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-08-27 23:02 +0200
      Re: Multiple image preload construct? Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2013-08-27 23:20 +0200
        Re: Multiple image preload construct? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-08-28 01:27 +0200
          Re: Multiple image preload construct? Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2013-08-29 03:56 +0200
            Re: Multiple image preload construct? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-08-29 15:16 +0200
      Re: Multiple image preload construct? Ken <usenet-so@abdiassoftware.com> - 2013-08-27 18:43 -0500
        Re: Multiple image preload construct? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-08-28 02:08 +0200
          Re: Multiple image preload construct? Ken <usenet-so@abdiassoftware.com> - 2013-08-27 19:49 -0500
            Re: Multiple image preload construct? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-08-28 03:17 +0200
              Re: Multiple image preload construct? Ken <usenet-so@abdiassoftware.com> - 2013-08-27 20:35 -0500
                Re: Multiple image preload construct? Dr J R Stockton <reply1300@merlyn.demon.co.uk.invalid> - 2013-08-29 19:32 +0100
              Re: Multiple image preload construct? John Harris <niam@jghnorth.org.uk.invalid> - 2013-08-28 16:20 +0100
            Re: Multiple image preload construct? Andrew Poulos <ap_prog@hotmail.com> - 2013-08-28 11:21 +1000
              Re: Multiple image preload construct? Ken <usenet-so@abdiassoftware.com> - 2013-08-27 20:48 -0500
                Re: Multiple image preload construct? Andrew Poulos <ap_prog@hotmail.com> - 2013-08-28 13:43 +1000
                Re: Multiple image preload construct? John Harris <niam@jghnorth.org.uk.invalid> - 2013-08-29 10:00 +0100
                Re: Multiple image preload construct? Andrew Poulos <ap_prog@hotmail.com> - 2013-08-30 07:25 +1000
                Re: Multiple image preload construct? John Harris <niam@jghnorth.org.uk.invalid> - 2013-08-30 10:11 +0100
        Re: Multiple image preload construct? Christoph Michael Becker <cmbecker69@arcor.de> - 2013-08-28 02:17 +0200
          Re: Multiple image preload construct? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-08-28 02:38 +0200
      Re: Multiple image preload construct? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-08-28 11:04 +0200
      Re: Multiple image preload construct? John Harris <niam@jghnorth.org.uk.invalid> - 2013-08-28 16:26 +0100

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