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FAQ Topic - How do I access a property of an object using a string? (2012-01-19)

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  FAQ Topic - How do I access a property of an object using a string? (2012-01-19) "FAQ server" <javascript@dotinternet.be> - 2012-01-19 00:00 +0000
    Re: FAQ Topic - How do I access a property of an object using a string? (2012-01-19) Dr J R Stockton <reply1203@merlyn.demon.co.uk> - 2012-01-20 19:09 +0000

#10376 — FAQ Topic - How do I access a property of an object using a string? (2012-01-19)

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FAQ Topic - How do I access a property of an object using
a string?
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There are two ways to access properties: dot notation and square bracket
notation. What you are looking for is the square bracket notation in
which the dot, and the identifier to its right, are replaced with a set
of square brackets containing a string. The value of the string matches
the identifier. For example:-

//dot notation
var bodyElement = document.body;

//square bracket notation, using an expression
var bodyElement = document["bo"+"dy"];

<URL: http://jibbering.com/faq/notes/square-brackets/>


The complete comp.lang.javascript FAQ is at
http://jibbering.com/faq/

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#10449

In comp.lang.javascript message <4f175d0a$0$283$14726298@news.sunsite.dk
>, Thu, 19 Jan 2012 00:00:03, FAQ server <javascript@dotinternet.be>
posted:

>FAQ Topic - How do I access a property of an object using
>a string?

One might add, it appears, that this can be used as a shorter way of
testing in a main file whether a variable has been defined in an include
file

        if (window["Tom"])
is shorter than
        if (typeof(Tom)!='undefined')

-- 
 (c) John Stockton, nr London, UK. ?@merlyn.demon.co.uk  Turnpike v6.05  MIME.
  Web  <http://www.merlyn.demon.co.uk/> - FAQqish topics, acronyms and links;
  Astro stuff via astron-1.htm, gravity0.htm ; quotings.htm, pascal.htm, etc.
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