Solved

Looping through form objects with the same name in JS

Posted on 2011-02-16
5
178 Views
Last Modified: 2012-05-11
I am using JS for validating user input.  The amount of lineitems that appear depend on the # of recors in the DB.  If I have more than 1 record my code works becuae I loop through the name of that textbox and i (in brackets of course).  ]The problem is when there is one record-only one text box.  Js doesn't create an array so textboxname 0 is null.  I assumed that if there is one textbox it would have 0as its index.  How can  I code for this scenario?  thanks
0
Comment
Question by:JSCF
  • 3
  • 2
5 Comments
 
LVL 16

Accepted Solution

by:
jmatix earned 250 total points
ID: 34909127
Use the loop only if textbox.length is defined else use textbox.value to get the only element's value.

if (document.forms[0].textbox.length)
//loop
else
val = document.forms[0].textbox.value;
0
 

Author Comment

by:JSCF
ID: 34909182
OK, but I was wondering about this because I have another page where users can add records.  If there is an error in user input.  It returns that one record-I loop through it in a very similar way and I do not get an error that time even though there is one textbox with that name on the page-wht is that?
0
 
LVL 16

Expert Comment

by:jmatix
ID: 34909500
I can't say why it is happening. Generally the rule of the thumb is if you have multiple elements with the same name you get a collection otherwise you get a single element.
0
 

Author Comment

by:JSCF
ID: 34909662
Is this common practice to allow for these two scenarios and basically repeat the code twice-when validating with JS?
0
 
LVL 16

Assisted Solution

by:jmatix
jmatix earned 250 total points
ID: 34909891
Yes, it is safest to do so. Or you should think of giving different names for the text boxes like textbox1, textbox2, etc.
0

Featured Post

Best Practices: Disaster Recovery Testing

Besides backup, any IT division should have a disaster recovery plan. You will find a few tips below relating to the development of such a plan and to what issues one should pay special attention in the course of backup planning.

Question has a verified solution.

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

Today I would like to talk about localizing (Internationalization) JavaScript applications. Introduction When creating an application that is going to be used by many people around the globe, it is important to remember that not everyone speak…
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…

773 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