E4X and ActionScript Variables

  1. var backgroundColor:uint = 0xEFEFEF;
  2. var borderColor:uint = 0xFF0000;
  3. var buttonOverColor:uint = 0x0000FF;
  4. var buttonOutColor:uint = 0x00CCCC;
  6. var uiColors:XML = <ui>
  7.     <default color="0xCCCCCC" />
  8.     <background color = { backgroundColor } />
  10.     <!-- note hexidecimal formatting code -->
  11.     <border color={ ("0x" + borderColor.toString(16)) } />
  13.     <button overColor={ buttonOverColor} outColor={ buttonOutColor } />
  14. </ui>
  16. trace(uiColors.toXMLString());
  18. /*outputs:
  19. <ui>
  20.   <default color="0xCCCCCC"/>
  21.   <background color="15724527"/>
  22.   <border color="0xff0000"/>
  23.   <button overColor="255" outColor="52428"/>
  24. </ui>
  25. */

The first time I needed to use an ActionScript variable within inline XML I was stumped. I couldn't figure it out and I wasn't able to easily find it on google. I eventually found it somewhere (don't remember where... possibly hidden away in the docs).

Now a search for "insert actionscript variables into e4x" on google gives plenty of results. But I figure it's worth a post.

I use actionscript to generate XML all the time so this comes in handy. I also store color values in automatically generated XML all the time. If I'm feeling organized I'll use something like what you see on line 10:

  1. <border color={ ("0x" + borderColor.toString(16)) } />

If you look at the output you'll see this formats the uint so that it's readable as a hex number. By default (as you can see in the output) uints will show up in decimal notation. This really doesn't make any difference if you don't care about XML readability ... or if you just don't care about the readability of the colors stored in your XML.....

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