Maybe a bug in JavaScript?

E

Emmett

Joined
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Alright so when I add a id tag to a html element [ <div id = 'test'>hi<div> ] and use [ document.querySelector("#test").style.backgroundColor = "green"; ], it works.
However the second I use [ mainwindow.id = 'test'; ] in [ const mainWindow = document.createElement("div"); document.body.appendChild(mainWindow); mainwindow.id = 'test'; ] it doesn't work! Why is this happening? if you find it out please let me know.

(Sorry for the messy code I'm making a bookmarklet application)
 
Last edited:
F

FResher

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Sep 4, 2022
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JavaScript: 
<html>
<head>
  <script language="javascript">

  function create(){

   var mainWindow = document.createElement("div"); // global VAR
   mainWindow.id = 'success';

   _add = document.querySelector('#test'); // local VAR
   
   _add.appendChild(mainWindow);

  mainWindow; // = Null
  _add; // = Null, reset of the var

}

</script>

</head>

<body onload="create();">

<div id="test"></div>

</body></html>

prefer using 'let' instead of 'const' , because 'const' are fixed.
 
F

FResher

Joined
Sep 4, 2022
Messages
128
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FResher said:
JavaScript: 
<html>
<head>
  <script language="javascript">

  function create(){

   var mainWindow = document.createElement("div"); // global VAR
   mainWindow.id = 'success';

   document.querySelector('#test').appendChild(mainWindow);

}

</script>

by js syntax , you can make an imperative instruction :
document.querySelector('#test').appendChild(mainWindow);
Click to expand...
 

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