javascript - this is defined, but children and querySelector fail for custom element -


i have custom element (input-date) inside custom element (edit-table). when go assign value input-date, inside 'set value' class member function log:

 console.log(this)

prints out element

<input-date id=​"cell" style=​"height:​ 100%;​ width:​ 300px;​">   ​<input id=​"input" placeholder=​"mm/​dd/​yyyy, hh:​mm am/​pm" style=​"font-family:​ "open sans", sans-serif;​ height:​ 100%;​ width:​ 100%;​ text-align:​ left;​ font-size:​ 18px;​ border:​ 2px;​ border-radius:​ 5px;​ padding:​ 5px;​">​ </input-date>​

but when do

 console.log(this.children);

and

 console.log(this.queryselector('#input'));

i 'null'.

the function 'this' inside 'set value' of input-date class

class inputdate extends htmlelement { ... connectedcallback() {   var input = document.createelement('input');   input.id = 'input';   this.appendchild(input); } set value(val) {   //val should date object    var = this.queryselector('#input');   if(i && val)   {     i.value = val.tolocalestring();   }   console.log(i,val,this, this.childnodes); } ... customelements.define('input-date',inputdate);

note: if relevant, my_date.value = some_date; (the part calls 'set value' class member function) happens in completion block xmlhttprequest api.

the input-date created inside custom element called edit-table.

so set users in 'edit-table'

get_users(function(r) {   if(r.hasownproperty('error_message'))   {     alert(r.error_message);   }   else   {     var table   = document.getelementbyid('edit-table');     table.users = r.users;     } });

then under 'edit-tables' 'set users', create 'input-date' element , try assign date server, (which wed feb 08 2017 00:00:00 gmt-0500)

class editusers extends htmlelement ... set users(users) {     ...   var check  = document.createelement('input-date');   check.value = new date('wed feb 08 2017 00:00:00 gmt-0500'); } customelements.define('edit-table',edittable); }

any ideas?

wow! cant believe it. i've been making mistake years , still doing it....

i need 'appendchild' of custom-element before doing

 my_element.value = new date();

because until 'appendchild' called, 'connectedcallback()' not called yet, , therefore 'input' element not appended custom-element yet, , therefore 'queryselector' cant find child yet.

thanks @mickers, didnt want bog down details, happened. helps someone


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