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Re: Adding extra element "to option list" using next loop?

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Am 27.11.2018 um 07:45 schrieb Jonas Thörnvall:
> Den måndag 26 november 2018 kl. 13:05:57 UTC+1 skrev Evertjan.:
>> =?UTF-8?Q?Jonas_Th=C3=B6rnvall?= <jonas.thornvall@gmail.com> wrote on 26
>> Nov 2018 in comp.lang.javascript:
>>
>>> Den lördag 24 november 2018 kl. 09:40:40 UTC+1 skrev Jonas Thörnvall:
>>>> I have a hard time understand the intrisic works of next loops, i use
>>>> exa
>>> mples i found on net onto create an optionlist of "devices".
>>>>
>>>> But i want to add an extra "option to the list of my own", but since i
>>>> do
>>>   not understand the inner works of next loop, i am a bit stumped howto
>>>   add my extra alternative to the option list. Here i try to add it
>>>   before, and i also tried after. But i do not know howto position myself
>>>   relative the next loop?
>>>>
>>>> Could someone please show me?
>>>>
>>>>    var optout = document.createElement("option");
>>>>    optout.text = "WEB SF2 SYNTH MY ADDED ADDED ALTERNATIVE";
>>>>    document.getElementById("out_portsel").add(optout);
>>>>    for (listoutput = Lportout.next(); listoutput && !listoutput.done; li
>>> stoutput = Lportout.next()) {
>>>>      var deviceOut = listoutput.value.name;
>>>>      optout.text = deviceOut;
>>>>      document.getElementById("out_portsel").add(optout);
>>>>    }
>>>
>>> What is the reason for this code not showing any element within loop
>>> just the extra added option? It seem to me it should add to the elements
>>> created in loop?
>>>
>>>   var optout = document.createElement("option");
>>>    for (listoutput = Lportout.next(); listoutput && !listoutput.done;
>>>    listoutput = Lportout.next()) {
>>>      var deviceOut = listoutput.value.name;
>>>      optout.text = deviceOut;
>>>      document.getElementById("out_portsel").add(optout);
>>>    }
>>>    test= document.getElementById("out_portsel");
>>>    optout.text = "SF2 SYNTH WEB";
>>>    test.add(optout);
>>
>> You will need a NEW optout each time, meThinks():
>>
>> [ES2015]
>> for (...) {
>>      const optout = document.createElement("OPTION");
>>      ...
>>      document.getElementById("out_portsel").appendChild(optout);
>> };
>>
>>
>>
>> -- 
>> Evertjan.
>> The Netherlands.
>> (Please change the x'es to dots in my emailaddress)
> 
> Maybe i missunderstand you, but the loop reading ports/devices into the option list work just fine no matter how many ports devices i have.
> 
> The problem arise when i want to add a pseudo port of my own to the list before, after or at index an index.
> 
> Before it will be overwritten in loop, after it will be the only option element.
> JT
> 

If the node argument to appendChild *already* is in the document, it 
will simply be moved to the new position.

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Thread

Adding extra element "to option list" using next loop? Jonas Thörnvall <jonas.thornvall@gmail.com> - 2018-11-24 00:40 -0800
  Re: Adding extra element "to option list" using next loop? Jonas Thörnvall <jonas.thornvall@gmail.com> - 2018-11-24 05:35 -0800
  Re: Adding extra element "to option list" using next loop? Jonas Thörnvall <jonas.thornvall@gmail.com> - 2018-11-25 19:57 -0800
    Re: Adding extra element "to option list" using next loop? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2018-11-26 13:05 +0100
      Re: Adding extra element "to option list" using next loop? Jonas Thörnvall <jonas.thornvall@gmail.com> - 2018-11-26 22:45 -0800
        Re: Adding extra element "to option list" using next loop? Jake Jarvis <pig_in_shoes@yahoo.com> - 2018-11-27 10:30 +0100
          Re: Adding extra element "to option list" using next loop? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2018-11-27 12:08 +0100
            Re: Adding extra element "to option list" using next loop? Jonas Thörnvall <jonas.thornvall@gmail.com> - 2018-11-27 12:43 -0800
              Re: Adding extra element "to option list" using next loop? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2018-11-27 23:39 +0100
                Re: Adding extra element "to option list" using next loop? Jonas Thörnvall <jonas.thornvall@gmail.com> - 2018-11-28 20:25 -0800

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