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Have a Javascript popup display Yes/ No instead of Confirm/ Cancel
1 new comments

Javascript to clear a listbox

 

commentsThis article has not been rated yet. After reading, feel free to leave comments and rate it.

Question:

How can I clear a listbox using Javascript?

Answer:

Use the code below. Call it by passing the listbox object to function clearlistbox()

function clearlistbox(lb){
  for (var i=lb.options.length-1; i>=0; i--){
    lb.options[i] = null;
  }
  lb.selectedIndex = -1;
}


// call it like this
clearlistbox(listbox1);

Comments:

2007-04-17, 11:16:10
anonymous from United States  
Now that's slick! I love one line solutions.
2007-10-18, 21:18:50   (updated: 2007-10-18, 21:23:27)
saralstalin@yahoo.co.in from India  
If there are selected items in the listbox, which you are trying to clear

lb.options.length = 0; will throw 'unspecified error' in IE6.
You can modify the function as

function clearlistbox(lb){
try
{
lb.options.length = 0;
}
catch(e)
{
clearlistbox(lb);
}
}
2007-10-18, 21:21:00
anonymous from India  
If there are selected items in the listbox, which you are trying to clear

lb.options.length = 0; will throw 'unspecified error' in IE6.
You can modify the function as

function clearlistbox(lb){
try
{
lb.options.length = 0;
}
catch(e)
{
clearlistbox(lb);
}
}
2008-05-09, 05:54:12
anonymous from Spain  
if will throw and erro if there are selected items...
lb.selectedIndex = -1;
lb.options.length = 0;
2010-02-01, 23:56:08
anonymous from India  
tfghfch h

 

 

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