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From: Dr J R Stockton <reply1142@merlyn.demon.co.uk>
Newsgroups: comp.lang.javascript
Subject: Re: Clear field with Javascript - use of variable?
Date: Fri, 21 Oct 2011 21:53:18 +0100
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In comp.lang.javascript message <j7q78d$mn7$1@dont-email.me>, Fri, 21
Oct 2011 00:27:23, Garry Jones <garry@garryjones.se> posted:

>I need to expand a function and a user button that clears an input
>field and sets focus.
> ...
>Instead of writing a seperate function for each input field I would
>like to use the same one and pass a variable from each link. Can
>someone point me in the right direction as I am having problems finding
>a good site with simple instructions for this.


        function cfld() {
           document.getElementById("newsinl").value="";
           document.getElementById("newsinl").focus();
        }

should. for readability, writeability, and efficiency, be

        function cfld() { var X = document.getElementById("newsinl")
           X.value="";
           X.focus();
        }

That is easily changed to
        function cfld(X) {
           X.value="";
           X.focus();
        }

now called by cfld(document.getElementById("newsinl"))

which can if beneficial be called by

        function CFLD(S) { cfld(document.getElementById(S))

but can be called directly and given a reference to the input control.

You should have read the section of the FAQ entitled "Getting a
Reference to an Element", except that it does not exist there, so if you
have trouble with the above read instead section "Getting a Reference to
a Page Element" in page <http://www.merlyn.demon.co.uk/js-faq-u.htm>.

-- 
 (c) John Stockton, nr London UK.  ?@merlyn.demon.co.uk  IE8 FF3 Op12 Sf5 Cr12
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