Solved

using indexof & substring

Posted on 2004-09-14
11
468 Views
Last Modified: 2010-05-18
Plesae don't laugh. I'm fair at VBScript and totally clueless at Javascript. I've got to very slightly modify a page based on some Javascript that was written by someone else.

Here's the error I'm encountering:
  Microsoft JScript runtime error '800a01b6'
  Object doesn't support this property or method
  blah blah blah at line 100

EXPLANATION:
~~~~~~~~~

There is a variable called PathStr, which is a partial path/filename. An example of a possible value of PathStr is:
     progressimages\7997-80720.13\255 KP - Aslab.JPG

I need to extract just the Filename without the extension. The code segment I've tried to use is:

// The next line is Line 100 where the error occurs.
   var offset1 = PathStr.indexof("\");
   var offset1 = PathStr.indexof(".jpg");
   var Caption = PathStr.substring(offset1, offset2);

Using the PathStr example value given above, I believe I'd end up with "7997-80720.13\255 KP - Aslab", then I'd do it again to get down to just the filename.

But dammed if I can see what's wrong with the offset1 and offeset2 lines. Just a syntax error or am I on the wrong track completely?

Or maybe there is a better, simpler way altogether?

TIA
 - Bill.
0
Comment
Question by:BillHely
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
  • 2
  • +2
11 Comments
 
LVL 13

Expert Comment

by:StormyWaters
ID: 12060478
Two things:

substring is actually substr, and you're defining 'offset1' twice instead of having the second as 'offset2'
0
 
LVL 13

Accepted Solution

by:
StormyWaters earned 50 total points
ID: 12060480
Oh, and indexof should be 'indexOf', javascript is case sensitive. 'substr' remains the same, I believe.
0
 
LVL 6

Expert Comment

by:ren_b
ID: 12060484
var offset1 = PathStr.indexof("\");

it thinks there isn't another quote because a backslash escapes a quote, so you'd need to do something like:

var offset1 = PathStr.indexof("\\");
0
Online Training Solution

Drastically shorten your training time with WalkMe's advanced online training solution that Guides your trainees to action. Forget about retraining and skyrocket knowledge retention rates.

 
LVL 13

Expert Comment

by:cLFlaVA
ID: 12060584
This will get you closer.

<script language="JavaScript">
<!--
   var PathStr = "progressimages\7997-80720.13\255 KP - Aslab.JPG".toString().quote();
   alert(PathStr);
   var lcPathStr = PathStr.toLowerCase();
   var offset1 = lcPathStr.indexOf("\\", lcPathStr.indexOf("\\") + 1) + 1;
   var offset2 = lcPathStr.indexOf(".jpg");
   alert(offset1);
   alert(offset2);
   var Caption = PathStr.substring(offset1, offset2);
   document.writeln(Caption);
-->
</script>

I'm still trying to determing why the 255 shows as "x".  I think it's because of the .quote() function, which I have used here to escape the \ with another \.
0
 
LVL 13

Expert Comment

by:cLFlaVA
ID: 12060597

This is a great example of why you really shouldn't start file names with numbers...
0
 
LVL 5

Expert Comment

by:darksinclair
ID: 12060635
Could you try this :

fileName = PathStr.substr(PathStr.lastIndexOf('\\')+1);

.. I think this will get you what you want, However, Im in class right now andI havent tested it :(

Sorry,
Cheers hope this works.
0
 
LVL 6

Expert Comment

by:ren_b
ID: 12060655
or you could forget the indexOf/substr junk and use a regex:

  PathStr = "progressimages\\7997-80720.13\\255 KP - Aslab.JPG"
  fileName = PathStr.match(/^.*?\\([^\\]*?)\.[^.]+$/)[1];
  alert(fileName);
0
 
LVL 5

Expert Comment

by:darksinclair
ID: 12060662
oh.. you also need to define your var PathName with double slashes. or use the unescape to get away form the \'s.

Cheers, the following works I tested it.

<HTML>
<SCRIPT>
function doThis()
{
     var PathStr = "progressimages\\7997-80720.13\\255 KP - Aslab.JPG";
     alert(PathStr);
     var fileName;
          fileName = PathStr.substr(PathStr.lastIndexOf('\\')+1);
     alert( fileName );
}
</SCRIPT>
<HEAD></HEAD>
<BODY>
<input type="button" onClick="doThis();" value="doThis()">
</BODY>
</HTML>
0
 

Author Comment

by:BillHely
ID: 12061113
Well, everybody helped and I got some better ideas, but unfortunately I can't split the money.

So in all fairness I'll have to accept the first answer that actually resolved the error I was getting at the time.

The immediate problem was the case of "indexof" instead of 'indexOf', which StormyWaters was the first to point out.

Thanks everyone. Doubtless I'll be back :-(

 - Bill
0
 
LVL 13

Expert Comment

by:cLFlaVA
ID: 12065181
Note: You can "split the money."  There is a link to "split" at the bottom.
0
 

Author Comment

by:BillHely
ID: 12070002

> Note: You can "split the money."  There is a link to "split" at the bottom.

My apologies to all. I didn't realize that. So much for making "assumptions"! Thanks for pointing it out --- I'll know for next time.
0

Featured Post

Get 15 Days FREE Full-Featured Trial

Benefit from a mission critical IT monitoring with Monitis Premium or get it FREE for your entry level monitoring needs.
-Over 200,000 users
-More than 300,000 websites monitored
-Used in 197 countries
-Recommended by 98% of users

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In Part 1 (http://www.experts-exchange.com/Programming/Languages/Scripting/JavaScript/A_7849-Hex-Maze.html) we covered the hexagonal maze basics -- how the cells are represented in a JavaScript array and how the maze is displayed.  In this part, we'…
Nothing in an HTTP request can be trusted, including HTTP headers and form data.  A form token is a tool that can be used to guard against request forgeries (CSRF).  This article shows an improved approach to form tokens, making it more difficult to…
The viewer will learn the basics of jQuery, including how to invoke it on a web page. Reference your jQuery libraries: (CODE) Include your new external js/jQuery file: (CODE) Write your first lines of code to setup your site for jQuery.: (CODE)
The viewer will learn the basics of jQuery including how to code hide show and toggles. Reference your jQuery libraries: (CODE) Include your new external js/jQuery file: (CODE) Write your first lines of code to setup your site for jQuery…
Suggested Courses
Course of the Month11 days, 10 hours left to enroll

623 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question