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Re: Preloading PNGs & assigning as bkgd-image

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Puzzled wrote on 21 apr 2012 in comp.lang.javascript:

> I'm trying to do pre-loading of images to reduce later latency,
> but am not getting anywhere despite everything I can find on the
> web and in Goodman.  I'd very much appreciate some help! (Firefox
> 3.6.25 under XPProSP3).
> 
> Supposedly, this should create an image object in the document's
> cache and load the bits into it:
> 
> var foo = new Image(70,25) ;  
> foo.src = 'mumble/fratz.png' ;
> foo.name = 'fratz' ;
> 
> but console.log('image count',document.images) returns the empty
> array and ~.length) returns 0, suggesting that I didn't get the
> syntax right after all.  Or that Image() isn't working, even
> though Firebug doesn't complain .
> 
> To assign the image, if the preload were working, what syntax
> would I use?
> 
> document.getElementById('some_td_id').style.background-image =
> foo.src ;

Do you want to substract mathematically 
the value of image from the value of ...style.background?

Try:

document.getElementById('some_td_id').style.backgroundImage =

Reading the docs of css use in javascript has it's merits:
<http://www.w3schools.com/cssref/pr_background-image.asp>
 
> document.getElemnetById('some_td_id'_).style.background-image =
> document.images.fratz ;

no not this one.
 
> or something else? 

<img src='mumble/fratz.png' style='width:1px;visibility:hidden;'>

document.getElementById('some_td_id').style.background-image =
'url(mumble/fratz.png)';

If you use an image twice on a page it is loaded only once, methinks.


-- 
Evertjan.
The Netherlands.
(Please change the x'es to dots in my emailaddress)

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Thread

Preloading PNGs & assigning as bkgd-image Puzzled <scratching.head@example.com> - 2012-04-21 14:20 -0400
  Re: Preloading PNGs & assigning as bkgd-image Stefan Weiss <krewecherl@gmail.com> - 2012-04-21 20:50 +0200
    Re: Preloading PNGs & assigning as bkgd-image Puzzled <scratching.head@example.com> - 2012-04-22 06:12 -0400
      Re: Preloading PNGs & assigning as bkgd-image Stefan Weiss <krewecherl@gmail.com> - 2012-04-22 20:18 +0200
  Re: Preloading PNGs & assigning as bkgd-image "Evertjan." <exjxw.hannivoort@interxnl.net> - 2012-04-21 18:56 +0000
    Re: Preloading PNGs & assigning as bkgd-image Puzzled <scratching.head@example.com> - 2012-04-22 07:07 -0400
      Re: Preloading PNGs & assigning as bkgd-image "Evertjan." <exjxw.hannivoort@interxnl.net> - 2012-04-23 10:22 +0000
        Re: Preloading PNGs & assigning as bkgd-image Stefan Weiss <krewecherl@gmail.com> - 2012-04-23 20:46 +0200
        Re: Preloading PNGs & assigning as bkgd-image Puzzled <scratching.head@example.com> - 2012-04-24 08:42 -0400
  Re: Preloading PNGs & assigning as bkgd-image SAM <stephanemoriaux.NoAdmin@wanadoo.fr.invalid> - 2012-04-22 00:24 +0200

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