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Re: Object prop missing?

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Andrew Poulos <ap_prog@hotmail.com> wrote on 13 Jun 2019 in
comp.lang.javascript: 

> On 13/06/2019 5:36 pm, Thomas 'PointedEars' Lahn wrote:
>> Andrew Poulos wrote:
>> 
>>> I've created a property and the console it tells me that it looks like
>>> this
>>>
>>> Object
>>>      elem: div#opt1.opt
>>>      h: 28
>>>      id: "opt1"
>>>      maxw: 548
>>>      on: false
>>>      pos: {x: 46}
>>>      txt: p
>>>      __proto__: Object
>>>
>>> yet when, right after, I try to get the value of op.h I get undefined
>>>
>>> console.log(op)   //--> give the object above
>>> console.log(op.h) //--> undefined
>>>
>>> I don't understand how this could be happening.
>> 
>> Show the code used to create and query the object, i.e. the entire
>> relevant part of the console transcript, *verbatim*.  And name the
>> runtime environment so that one can take at least a guess at the used
>> ECMAScript implementation.
> 
> var options = [
>                 {},
>                 {"id": "opt1", "on": false },
>                 {"id": "opt2", "on": false },
>                 {"id": "opt3", "on": false },
>                 {"id": "opt4", "on": false },
>                 {"id": "opt5", "on": false }
>                ];
> 
> for (var i = 6; i > 0; i--) {
>    // add stuff to options elements
>    options[i].h = 28;
>}
> 
> showOptions();
> 
> function showOptions() {
>    console.log(options[1]);        // 1.
>    console.log(options[1].h)       // 2.
>    console.log(typeof options[1]); // 3.
> 
>    // code that relies on .h values
>}
> 
> In Windows Chrome 75.0.3770.80 (64-bit):
> 
> 1.
> > Object
> 
> when opened
> 
> v Object
>    > elem: div#opt1.opt
>      h: 28
>      id: "opt1"
>      maxw: 548
>      on: false
>    > pos: {x: 46}
>    > txt: p
>      __proto__: Object
> 
> 2. undefined
> 
> 3. object
> 
> h is in options[1] but when I try to get the value it's not.
> 
> Andrew Poulos

You did not test this, because option[6] does not exist and gives an error.

However this works fine:

var options = [
                {},
                {"id": "opt1", "on": false },
                {"id": "opt2", "on": false },
                {"id": "opt3", "on": false },
                {"id": "opt4", "on": false },
                {"id": "opt5", "on": false }
               ];

options[1].h = 28;

showOptions();

function showOptions() {
   console.log(options[1]); 
   console.log(options[1].h);
   console.log(typeof options[1]);
}

// {id: "opt1", on: false, h: 28}
// 28
// object




-- 
Evertjan.
The Netherlands.
(Please change the x'es to dots in my emailaddress)

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Thread

Object prop missing? Andrew Poulos <ap_prog@hotmail.com> - 2019-06-13 16:25 +1000
  Re: Object prop missing? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2019-06-13 09:37 +0200
    Re: Object prop missing? Andrew Poulos <ap_prog@hotmail.com> - 2019-06-13 20:05 +1000
      Re: Object prop missing? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2019-06-13 12:33 +0200
        Re: Object prop missing? Andrew Poulos <ap_prog@hotmail.com> - 2019-06-13 20:53 +1000
          Re: Object prop missing? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2019-06-13 13:09 +0200
            Re: Object prop missing? Andrew Poulos <ap_prog@hotmail.com> - 2019-06-13 21:54 +1000
              Re: Object prop missing? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2019-06-13 17:30 +0200
      Re: Object prop missing? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2019-06-13 13:05 +0200
  Re: Object prop missing? JJ <jj4public@vfemail.net> - 2019-06-13 15:41 +0700

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