Solved

Can an <option>  tag be dynamically modified?

Posted on 1999-01-21
6
186 Views
Last Modified: 2010-04-09
Can the following be done:
An html page contains radio buttons and an option tag (combo box).  If you click one of the radio buttons, a javascript is called that will modify the content (the pulldown options) in the option tag dynamically without reloading a new page.  Can it be done? if so, what is the code (in JVScript or html) that will modify the content of the option dynamically.
0
Comment
Question by:matala
6 Comments
 
LVL 6

Expert Comment

by:PBall
ID: 1845580
Yes, but it might not work on some older browsers like IE3 (I think)

<select name=selAnswers>
<option value='a'>16 meters
<option value='b'>12 meters
<option value='c'>14 meters
<option value='d'>other

<script>
document.selAnswer.options[0] = new Option('a','New York')
document.selAnswer.options[1] = new Option('b','Chicago')
document.selAnswer.options[2] = new Option('c','Dallas')
document.selAnswer.options[3] = new Option('c','San Francisco')
</script>

Hmm..I forgot how to delete the previous options tho, hmm...
anyone?
0
 
LVL 4

Expert Comment

by:martinag
ID: 1845581
The list has got to be filled with x empty options where x is the number of options that will ever be used.
Then, you dynamically assign text and value
<SELECT>
<OPTION>
<OPTION>
<OPTION>
</SELECT>
[...]
// A list
list.options[0].value = "soccer";
list.options[0].text = "Soccer";
list.options[1].value = "basketball";
list.options[1].text = "BasketBall;
list.options[2].value = "hockey";
list.options[3].text = "Hockey";
[...]
// Another list
list.options[0].value = "y";
list.options[0].text = "Yes";
list.options[1].value = "n";
list.options[1].text = "No";
list.options[2].value = ""; // Empty, or it will be "hockey"
list.options[3].text = ""; // Empty, or it will be "Hockey"

Martin
0
 
LVL 4

Expert Comment

by:martinag
ID: 1845582
When you do like PBall suggests you have to reload for the changes to be made.

Martin
0
Does Powershell have you tied up in knots?

Managing Active Directory does not always have to be complicated.  If you are spending more time trying instead of doing, then it's time to look at something else. For nearly 20 years, AD admins around the world have used one tool for day-to-day AD management: Hyena. Discover why

 
LVL 4

Expert Comment

by:martinag
ID: 1845583
Oops.
  list.options[2].value = ...
  list.options[3].text = ...
should of course be
  list.options[2].value = ..
  list.options[2].text = ...

Martin
0
 

Author Comment

by:matala
ID: 1845584
Thanks, it works with netscape, but not with iexplorer.  How can I make it work in both.
The error in iexplorer 4.0 is "...options is not an object"
0
 
LVL 11

Accepted Solution

by:
mouatts earned 50 total points
ID: 1845585
Firstly it should  option not options.
Secondly to remove all element from the list you can use option.length=0
Thus you only need to put the options that need to be there and don't need 'empty' ones to fill the gaps.
0

Featured Post

ScreenConnect 6.0 Free Trial

Want empowering updates? You're in the right place! Discover new features in ScreenConnect 6.0, based on partner feedback, to keep you business operating smoothly and optimally (the way it should be). Explore all of the extras and enhancements for yourself!

Question has a verified solution.

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

This article describes how to create custom column layout styles for Bootstrap. The article uses 5 columns to illustrate the concept, but the principle can be extended to any number of columns.
This article discusses four methods for overlaying images in a container on a web page
The viewer will the learn the benefit of plain text editors and code an HTML5 based template for use in further tutorials.
Video by: Mark
This lesson goes over how to construct ordered and unordered lists and how to create hyperlinks.

831 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