Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.javascript > #14977

Re: Built-in string functions clobber strings in array?

Show all headers | View raw

On Monday, July 9, 2012 4:36:52 AM UTC-4, Gregor Kofler wrote:
> Am 2012-07-09 05:01, terphenyl meinte:
> > In an test html page I have 5 lines like:
> > <a href="http://www.yahoo.com">Yahoo</a>
> > <a href="http://www.google.com">Google</a>
> > <a href="mailto:?Bcc=k-smith@abcd.edu">Email me</A>
> > <a href="http://www.hotmail.com">Google</a>
> > <a href="mailto:?Bcc=k-jones@abcd.edu">Email him</A>
> > and I want my javascript to return the URLs as strings I can
> > detect, say, the mailto: lines.
> > This almost works:
> >
> > var allLinks = content.document.getElementsByTagName("a");
> > var txt = '';
> > var stxt = '';
> >
> >   for( var jj=0, kk=0; jj < allLinks.length; jj++)
> >              {
> >               document.write("
> " + jj + "    ");
> >               //document.write(allLinks[jj]);
> >               txt = allLinks[jj];
> >               document.write(txt);
> >               stxt = txt.substring(4,8);
> >               // var n = s.indexOf("Bcc");
> >             }
> > This will write on the page the index (jj), and the URL for the
> > [0] index element of allLinks (as the copied string txt), and then
> > just stop, even though there are 5 elements, 0...4.
> > WITHOUT the txt.substring(4,8) or indexOf, or any built-in string
> > function, all 5 URLs are displayed just fine (with the indexes).
> >
> > I thought the elements of allLinks were strings
> 
> allLLinks is a collection of DOM elements.
> 
> , and, to be conservative
> > copied the strings to a different variable (txt) and then tried a string operation (or two) on that variable.
> 
> An internal toString() method is invoked (which - here in FF - gives you 
> the href attribute value of the anchor). However, they are not strings 
> and don't provide string methods. Try something like allLinks[jj].href 
> which holds a string.
> 
> Gregor
> 
> 
> -- 
> http://vxweb.net

Thank you.  I ran across something like this a long time ago using the C++ STL <string> classes where the variable held a pointer that would print the string, but you had to de-reference a pointer to do work on the characters.  Javascript is new to me, and there is a lot to it.
Thank you again, Gregor.

--jim    

Back to comp.lang.javascript | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Built-in string functions clobber strings in array? terphenyl <terphenyl@hotmail.com> - 2012-07-08 20:01 -0700
  Re: Built-in string functions clobber strings in array? Gregor Kofler <usenet@gregorkofler.com> - 2012-07-09 10:36 +0200
    Re: Built-in string functions clobber strings in array? terphenyl@hotmail.com - 2012-07-09 12:39 -0700
    Re: Built-in string functions clobber strings in array? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-07-09 22:09 +0200

csiph-web