selectable table

HTML

<table id="selectableTable">
    <thead id="selectableTableHead">
        <tr>
            <th>Omschrijving 1</th>
            <th>Omschrijving 2</th>
        </tr>
    </thead>
    <tbody id="selectableTableBody">
       
    </tbody>
</table>

CSS

body {
	padding: 10px 10px;
	font-family: sans-serif;
}
.selectedTableItem {
	background-color: #7194ff;
}
#selectableTable {
	width: 100%;
	border-collapse: collapse;
	text-align: center;
	max-width: 850px;
}
tr {
	display: grid;
	grid-template-columns: 50% 50%;
}
#selectableTableHead {
	background-color: #95b1ff;
	border-top-left-radius: 5px;
	border-top-right-radius: 5px;
}
#selectableTableBody {
	height: 300px;
	overflow: auto;
	display: block;
}
td, th {
	padding: 10px 0;
}
tr:nth-child(even) {
	background-color: #e4ebff;
}
#selectableTableBody > tr:hover {
	background-color: #b3c6ff;
	cursor: pointer;
	user-select: none;
}
.selected {
	background-color: #5781ff !important;
}

JavaScript

var Artikelnummer = 0;
var Omschrijving_1 = 1;
var Omschrijving_2 = 2;
var Z_indexnr = 3;
var demoP = document.getElementById("demo");
var bosmanZIndexA = [
	[10087553, "Abena Abri-bag wegwerpzakjes", "zipsluiting blauw", 15667316, 108016],
	[10087539, "Abena Abri-bed comfort", "steeklaken 80x175cm", 15066703, 246641],
	[10087528, "Abena Abri-fix leaf", "fixatiebroek met pijp M", 15920712, 4102],
	[10087530, "Abena Abri-fix leaf", "fixatiebroek met pijp L", 15920704, 4103],
	[10087536, "Abena Abri-fix leaf", "fixatiebroek met pijp XL", 15920739, 4104],
	[10087555, "Abena Abri-fix leaf", "fixatiebroek met pijp S", 15920720, 4101],
	[10087556, "Abena Abri-fix leaf", "fixatiebroek met pijp XXL", 15920755, 4105],
	[10088686, "Abena Abri-fix leaf", "fixatiebroek met pijp XS", 15920747, 4100],
	[10087543, "Abena Abri-fix leaf super", "fixatiebroek XL", 15920801, 3884],
	[10087544, "Abena Abri-fix leaf super", "fixatiebroek L", 15920763, 3883],
	[10087554, "Abena Abri-fix leaf super", "fixatiebroek S", 15920798, 3881],
	[10087557, "Abena Abri-fix soft cotton", "fixatiebroek M", 15920631, 4132],
	[10087537, "Abena Abri-fix stretchbroek", "met pijp XXL", 14716666, 4242],
	[10087547, "Abena Abri-fix stretchbroek", "met pijp XL", 14716658, 4241],
	[10087548, "Abena Abri-fix stretchbroek", "super 5XL", 15921026, 90698],
	[10087552, "Abena Abri-fix stretchbroek", "met pijp L", 14716615, 4240],
	[10088541, "Abena Abri-flex pants extra", "L2 DK", 16194381, 41087],
	[10088543, "Abena Abri-flex pants extra", "L3 DK", 16194403, 41088],
	[10088544, "Abena Abri-flex pants extra", "M 2  DK", 16194357, 41084],
	[10088545, "Abena Abri-flex pants extra", "M 3  DK", 16194365, 41085],
	[10087526, "Abena Abri-flex pants plus", "XL 2", 16194438, 41090],
	[10088551, "Abena Abri-flex pants plus", "XL 1  DK", 16194411, 41089],
	[10088547, "Abena Abri-flex pants plus L 1", "DK", 16194373, 41086],
	[10088549, "Abena Abri-flex pants plus M 1", "DK", 16194349, 41083],
	[10088546, "Abena Abri-flex...