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Re: Dynamically assign image map values?

From Tuxedo <tuxedo@mailinator.com>
Newsgroups comp.lang.javascript
Subject Re: Dynamically assign image map values?
Date 2014-10-30 20:52 +0100
Organization albasani.net
Message-ID <m2u4te$ubg$1@news.albasani.net> (permalink)
References (2 earlier) <m2qkt1$reb$1@news.albasani.net> <m2rbk4$a71$1@news.albasani.net> <m2rjvi$r6c$1@news.albasani.net> <m2tssv$d2r$1@news.albasani.net> <m2tu5b$lkq$1@dont-email.me>

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Jukka K. Korpela wrote:

[...]

> 
> Yes, because only the second argument matters here, the rest are
> discarded. You need this:
> 
> area.setAttribute("coords", x1 + "," + y1 + "," + x2 + "," + y2);
> 
> So you don’t quote the variable names, as they need to be evaluated, not
> used literally. And you quote the commas, as they are to be taken
> literally. The plus + operator performs string catenation when its
> operands (or at least one of the operands) is a string.

Many thanks the correctly quoted code - problem solved!

Given the fact that the coordinates are dynamically generated I may end up 
with decimals in the coordinates, such as 42.699999999999996 etc.
I guess the browsers ignore fractions or maybe the above becomes a 43 
pixels offset. Still, it appears to work. Maybe I should round the numbers.

Tuxedo

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Thread

Dynamically assign image map values? Tuxedo <tuxedo@mailinator.com> - 2014-10-29 08:47 +0100
  Re: Dynamically assign image map values? "Jukka K. Korpela" <jkorpela@cs.tut.fi> - 2014-10-29 10:25 +0200
    Re: Dynamically assign image map values? Tuxedo <tuxedo@mailinator.com> - 2014-10-29 13:00 +0100
      Re: Dynamically assign image map values? Tuxedo <tuxedo@mailinator.com> - 2014-10-29 19:28 +0100
        Re: Dynamically assign image map values? Tuxedo <tuxedo@mailinator.com> - 2014-10-29 21:50 +0100
          Re: Dynamically assign image map values? "Jukka K. Korpela" <jkorpela@cs.tut.fi> - 2014-10-30 07:51 +0200
            Re: Dynamically assign image map values? Tuxedo <tuxedo@mailinator.com> - 2014-10-30 09:44 +0100
          Re: Dynamically assign image map values? Tuxedo <tuxedo@mailinator.com> - 2014-10-30 18:35 +0100
            Re: Dynamically assign image map values? "Jukka K. Korpela" <jkorpela@cs.tut.fi> - 2014-10-30 19:57 +0200
              Re: Dynamically assign image map values? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-10-30 19:46 +0100
                Re: Dynamically assign image map values? "Jukka K. Korpela" <jkorpela@cs.tut.fi> - 2014-10-30 20:57 +0200
                Re: Dynamically assign image map values? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2014-10-30 21:26 +0100
                Re: Dynamically assign image map values? "Jukka K. Korpela" <jkorpela@cs.tut.fi> - 2014-10-30 22:58 +0200
              Re: Dynamically assign image map values? Tuxedo <tuxedo@mailinator.com> - 2014-10-30 20:52 +0100
                Re: Dynamically assign image map values? "Jukka K. Korpela" <jkorpela@cs.tut.fi> - 2014-10-30 22:23 +0200

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