Question

If I have a selector with drop-down options, how can I change a color of all cells in this row on change?

function changeColor(){

}

$(".mySelector").change(function() {
    changeColor();
});

<table>
<tr>
    <td>val 1</td>
    <td>val 2</td>
    <td>
    <select class="mySelector">
        <option value="red">red</option>
        <option value="grn">green</option>
        <option value="blu">blue</option>
    </select>
    </td>
</tr>
<tr>
    <td>val 3</td>
    <td>val 4</td>
    <td>
    <select class="mySelector">
        <option value="red">red</option>
        <option value="grn">green</option>
        <option value="blu">blue</option>
    </select>
    </td>
</tr>
</table>

Answer 1

You can use closest() to get the nearest <tr> ancestor of your <select> element:

$(".mySelector").change(function() {
    $(this).closest("tr").css("background-color",
        $("option:selected", this).text());
});