JavaScript button click changes the selected row's color in a DataTable

I am looking to dynamically change the color of a row in my Datatable when a specific button is clicked.

Here is the HTML code snippet for the rows:

<tr role="row" class="odd"></tr>
<tr role="row" class="even selected"></tr>
<tr role="row" class="odd"></tr>
<tr role="row" class="even"></tr>

In the inspect tab, I can manually change the background color of a selected row like this:

table.dataTable tbody tr.selected {
    background-color: orange;
}

I attempted writing JavaScript to achieve this functionality, but encountered an error. Here's the snippet of the code:

$("#btnApply").click(function() {
        var selectedRows = document.getElementsByClassName("selected");
        selectedRows.forEach(row => {
            row.style.backgroundColor = "orange";
        });
     });

The error message I received was:

Uncaught TypeError: Cannot set property 'backgroundColor' of undefined

Answer №1

Using jQuery in the initial line, why not continue utilizing it in this manner:

$("#btnApply").click(function() {
  $(".selected").css('background-color', 'green');
});
table tr.selected {
    background-color: orange;
}
<script src="https://code.jquery.com/jquery-3.4.1.min.js"></script>
<table>
<tr role="row" class="odd"><td>aa</td></tr>
<tr role="row" class="even selected"><td>aa</td></tr>
<tr role="row" class="odd"><td>aa</td></tr>
<tr role="row" class="even"><td>aa</td></tr>
</table>
<input type="button" id="btnApply" value="click">

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