Когда вы рекурсивно вызываете функцию listOrg, вы должны отправить переменную newUL в качестве параметра вместо lowUL.listOrg(orgData[i].children,newUL) это будет предназначаться для недавно созданного ul, вам не нужно использовать querySelector
// DATA
const org1_depts = [
{
name: 'accounting',
children: [
{ name: 'accounting payable', children: [] },
{ name: 'accounting receivable', children: [] },
],
},
{
name: 'finance',
children: [],
},
]
const org2_depts = [
{
name: 'accounting',
children: [
{ name: 'accounting payable', children: [] },
{
name: 'accounting receivable',
children: [{ name: 'cash', children: [] }, { name: 'check', children: [] }],
},
],
},
{
name: 'finance',
children: [{ name: 'investment', children: [] }],
},
]
// FUNCTION
function listOrg(orgData,targetUL) {
var i;
for (i = 0; i < orgData.length; i++) {
if (orgData[i].hasOwnProperty('name')) {
// Take out the text from the .name property
var nameText = document.createTextNode(orgData[i].name);
// Define a new <li> tag
var newLI = document.createElement('li');
// Append text to new <li> tage - newLI
newLI.appendChild(nameText);
// Append element to <ul> tag
targetUL.appendChild(newLI);
}
if (orgData[i].hasOwnProperty('children')) {
// Define new <ul> tag
var newUL = document.createElement('ul');
// Append new <ul> tag
var lowUl = targetUL.appendChild(newUL);
// Select new lower level <ul> tag
var lowUL = targetUL.querySelector('ul');
// Recurse
listOrg(orgData[i].children,newUL );
}
}
}
// CALL FUNCTION
listOrg(org1_depts,document.getElementById("org1"));
listOrg(org2_depts,document.getElementById("org2"));
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<ul id='org1'>
Organization 1
</ul>
<ul id='org2'>
Organization 2
</ul>
</body>
</html>