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

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=?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)

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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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