Solved

Javascript for next loop but in reverse

Posted on 2012-04-05
2
175 Views
Last Modified: 2012-04-05
I have a loop.  But it's REMOVING invalid file extensions... see below.

var items = response.split("\n");
var myItemsOrgLength = items.length;
var myListOfExt = [];      
//alert(items.length);
var y;
//remove any items where the file extension is not in the validTypes list
for (x= items.length - 1; x >= 0; x--)
{
      fields = items[x].split("\t");
      // split filename into fields on the ".", then pop the last field from the stack: the file extension
      var ext = fields[1].split(".").pop();
            
            if (!contains(validTypes, ext))
      {
          myListOfExt[x] = ext;
          items.splice(x,1);
      }
    }
Just so you know, validTypes is a comma delimited strting from an XML file of acceptable file types.: example:  pdf,doc,docx,jpg,tif.... and so on.

The problem is, that the array doesn't start at ZERO but starts at 1, thus throwing off my array LENGTH.

Any thoughts?

here's the contains() function:

            function contains(array, value)
            {
              value = value.toUpperCase();
             
              for (var x= 0; x< array.length; x++)
                    if (array[x].toUpperCase() == value)
                          return true;
                    return false;
            }
0
Comment
Question by:pborregg
2 Comments
 
LVL 22

Accepted Solution

by:
Ivo Stoykov earned 500 total points
ID: 37810648
just add a check whether item exists...

HTH

Ivo Stoykov

for (x= items.length - 1; x >= 0; x--)
{
// check whether it is valid item
      if(!items[0]) {  continue;  }
      fields = items[x].split("\t");

Open in new window

0
 

Author Closing Comment

by:pborregg
ID: 37811561
Cool
0

Featured Post

Announcing the Most Valuable Experts of 2016

MVEs are more concerned with the satisfaction of those they help than with the considerable points they can earn. They are the types of people you feel privileged to call colleagues. Join us in honoring this amazing group of Experts.

Question has a verified solution.

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

When you need to keep track of a simple list of numbers or strings, the Array object is your most direct tool.  As we saw in my earlier EE Article (http://www.experts-exchange.com/A_3488.html), typical array handling might look like this: (CODE) B…
This article discusses the difference between strict equality operator and equality operator in JavaScript. The Need: Because JavaScript performs an implicit type conversion when performing comparisons, we have to take this into account when wri…
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…

808 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