Removing all but first item in drop down list

[Chris]

How do I amend the following code to skip removing the first option in
my dropdown list i.e. I want the first option "Please select..." to
stay?

while (document.getEl ementById("myco mbo").childNode s.length 0) {
document.getEle mentById("mycom bo").removeChil d(document.getE lementById("myc ombo").childNod es[0])
}

Many thanks,

Chris

[Gregor Kofler]

Re: Removing all but first item in drop down list

Chris meinte:

How do I amend the following code to skip removing the first option in
my dropdown list i.e. I want the first option "Please select..." to
stay?
>

Untested:

var e = document.getEle mentById("mycom bo");
while (e.childNodes.l ength 1) {
e.removeChild(e .lastChild);
}

Gregor

[liamgegan@gmail.com]

Re: Removing all but first item in drop down list

var oplist=document .getElementById ("mycombo");
for(var i = oplist.options. length-1;i>0;i--)
{
oplist.removeCh ild(oplist.opti ons[i]);
}

[Conrad Lender]

Re: Removing all but first item in drop down list

On 2008-10-23 22:58, Chris wrote:

How do I amend the following code to skip removing the first option
in my dropdown list i.e. I want the first option "Please select..."
to stay?
>
while (document.getEl ementById("myco mbo").childNode s.length 0) {
document.getEle mentById("mycom bo").removeChil d(document.getE lementById("myc ombo").childNod es[0])
}

document.getEle mentById("mycom bo").options.le ngth = 1;


- Conrad

[Jorge]

Re: Removing all but first item in drop down list

On Oct 23, 10:58 pm, Chris <matchett...@go oglemail.comwro te:

How do I amend the following code to skip removing the first option in
my dropdown list i.e. I want the first option "Please select..." to
stay?
>
while (document.getEl ementById("myco mbo").childNode s.length 0) {
document.getEle mentById("mycom bo").removeChil d(document.getE lementById("myc ombo").childNod es[0])
}
>

var e= document.getEle mentById("mycom bo");
while (e.firstChild !== (d= e.lastChild)) { e.removeChild(d ); }


If there are many children this might be faster:

var e= document.getEle mentById("mycom bo"), d= e.firstChild;
e.innerHTML= "";
e.appendChild(d );

--
Jorge.

[Amrit Ranjan]

Re: Removing all but first item in drop down list

I think
document.getEle mentById("mycom bo").length = 1;
will be more than enough.

[Amrit Ranjan]

Re: Removing all but first item in drop down list

I think
document.getEle mentById("mycom bo").length = 1;
will be more than enough.

[Chris]

Re: Removing all but first item in drop down list

On 24 Oct, 08:21, Amrit Ranjan <amri...@gmail. comwrote:

I think
            document.getEle mentById("mycom bo").length = 1;
will be more than enough.

Didn't get it at first Amrit but thanks, very clever!

Chris

[Gregor Kofler]

Re: Removing all but first item in drop down list

Conrad Lender meinte:

On 2008-10-23 22:58, Chris wrote:

>How do I amend the following code to skip removing the first option
>in my dropdown list i.e. I want the first option "Please select..."
>to stay?
>>
>while (document.getEl ementById("myco mbo").childNode s.length 0) {
>document.getEl ementById("myco mbo").removeChi ld(document.get ElementById("my combo").childNo des[0])
> }

>
document.getEle mentById("mycom bo").options.le ngth = 1;

Will this free the ressources occupied by the now discarded options, too?

Gregor

[Conrad Lender]

Re: Removing all but first item in drop down list

On 2008-10-25 23:10, Gregor Kofler wrote:

>document.getEl ementById("myco mbo").options.l ength = 1;

>
Will this free the ressources occupied by the now discarded options,
too?

I guess that would depend on the implementation. They should be freed
(sooner or later) by a reasonably designed scripting engine, same as
with removeChild(). In IE, on the other hand, there's still the GC
problem with circular references between JScript and host objects, so
there's at least one implementation that won't free the resources in
certain cases. removeChild() wouldn't help there either.


- Conrad