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devel / comp.lang.javascript / Get droplist index value by name?

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* Get droplist index value by name?Jonas Thörnvall
`* Re: Get droplist index value by name?Jonas Thörnvall
 `* Re: Get droplist index value by name?Jonas Thörnvall
  `- Re: Get droplist index value by name?Jonas Thörnvall

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Get droplist index value by name?

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Subject: Get droplist index value by name?
From: jonas.thornvall@gmail.com (Jonas Thörnvall)
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 by: Jonas Thörnvall - Fri, 15 Oct 2021 06:41 UTC

I have a dropdown "select option list" holding midi portIDs.
So reading the dropdown i know the name of available midiports.

I can visualy inspect to know the index of the ID i want.

But how can i use the ID to retrieve the index?
ctrlportindex=parent.document.getElementById("parent.out_portsel").value // "FW1884 Control"

It is the the index of the Id of element out_portsel i am looking for?

Maybe i am doing it backward but i use the index to select output port.
In this case i know the "id" i want, but want is its index in the dropdownlist?

Re: Get droplist index value by name?

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Subject: Re: Get droplist index value by name?
From: jonas.thornvall@gmail.com (Jonas Thörnvall)
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 by: Jonas Thörnvall - Fri, 15 Oct 2021 06:47 UTC

fredag 15 oktober 2021 kl. 08:41:19 UTC+2 skrev Jonas Thörnvall:
> I have a dropdown "select option list" holding midi portIDs.
> So reading the dropdown i know the name of available midiports.
>
> I can visualy inspect to know the index of the ID i want.
>
> But how can i use the ID to retrieve the index?
> ctrlportindex=parent.document.getElementById("parent.out_portsel").value // "FW1884 Control"
>
> It is the the index of the Id of element out_portsel i am looking for?
>
> Maybe i am doing it backward but i use the index to select output port.
> In this case i know the "id" i want, but want is its index in the dropdownlist?
I could probably loop through the id's equal to "x" and read out the index by loop counter.
But it seem a "A BIT IDIOTIC" if there already is a function for retrieving it.

Re: Get droplist index value by name?

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Subject: Re: Get droplist index value by name?
From: jonas.thornvall@gmail.com (Jonas Thörnvall)
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 by: Jonas Thörnvall - Fri, 15 Oct 2021 06:49 UTC

fredag 15 oktober 2021 kl. 08:47:50 UTC+2 skrev Jonas Thörnvall:
> fredag 15 oktober 2021 kl. 08:41:19 UTC+2 skrev Jonas Thörnvall:
> > I have a dropdown "select option list" holding midi portIDs.
> > So reading the dropdown i know the name of available midiports.
> >
> > I can visualy inspect to know the index of the ID i want.
> >
> > But how can i use the ID to retrieve the index?
> > ctrlportindex=parent.document.getElementById("parent.out_portsel").value // "FW1884 Control"
> >
> > It is the the index of the Id of element out_portsel i am looking for?
> >
> > Maybe i am doing it backward but i use the index to select output port.
> > In this case i know the "id" i want, but want is its index in the dropdownlist?
> I could probably loop through the id's equal to "x" and read out the index by loop counter.
> But it seem a "A BIT IDIOTIC" if there already is a function for retrieving it.
I give it 30 minutes "then i am going idiotic"

Re: Get droplist index value by name?

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Subject: Re: Get droplist index value by name?
From: jonas.thornvall@gmail.com (Jonas Thörnvall)
Injection-Date: Fri, 15 Oct 2021 07:18:36 +0000
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 by: Jonas Thörnvall - Fri, 15 Oct 2021 07:18 UTC

fredag 15 oktober 2021 kl. 08:49:46 UTC+2 skrev Jonas Thörnvall:
> fredag 15 oktober 2021 kl. 08:47:50 UTC+2 skrev Jonas Thörnvall:
> > fredag 15 oktober 2021 kl. 08:41:19 UTC+2 skrev Jonas Thörnvall:
> > > I have a dropdown "select option list" holding midi portIDs.
> > > So reading the dropdown i know the name of available midiports.
> > >
> > > I can visualy inspect to know the index of the ID i want.
> > >
> > > But how can i use the ID to retrieve the index?
> > > ctrlportindex=parent.document.getElementById("parent.out_portsel").value // "FW1884 Control"
> > >
> > > It is the the index of the Id of element out_portsel i am looking for?
> > >
> > > Maybe i am doing it backward but i use the index to select output port.
> > > In this case i know the "id" i want, but want is its index in the dropdownlist?
> > I could probably loop through the id's equal to "x" and read out the index by loop counter.
> > But it seem a "A BIT IDIOTIC" if there already is a function for retrieving it.
> I give it 30 minutes "then i am going idiotic"
Ok this is how it ended up.

function getPortIndex(){
var e = parent.document.getElementById("out_portsel");
for (var i=0;i<parent.out_portsel.length;i++){
if (e.options[i].value=="FW1884 Control"){ctrlportindex=i; break;};
}
}

devel / comp.lang.javascript / Get droplist index value by name?

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