JSFiddle - React, Tailwind, and code Playground

HTML

<form action="" id="scheduler">
<table class="table sds">    
    <tr>
        <td>
            <input type='datepick' name='scheduledatepick[0]' />
            <select name='schedulein[0]'>
                <option>--</option>
                <option>Selected</option>
            </select>
            <input type='text' name='location[0]' />
        </td>
    </tr>
    <tr>
        <td>
            <input type='datepick' name='scheduledatepick[1]' />
            <select name='schedulein[1]'>
                <option>--</option>
                <option>Selected</option>
            </select>
            <input type='text' name='location[1]' />
        </td>
    </tr>
    <tr>
        <td>
            <input type='datepick' name='scheduledatepick[2]' />
            <select name='schedulein[2]'>
                <option>--</option>
                <option>Selected</option>
            </select>
            <input type='text' name='location[2]' />
        </td>
    </tr>
</table>
<button>Validate!</button>
</form>

CSS

.error { background-color: red; }

JavaScript

$('.table').click(function() {
    // set up an array to store the invalid rows
    var rows = new Array();
    $('table tr')
        // reset all rows before we validate
        .removeClass("error")
        // loop over each row
        .each(function(i) {
            // work out whether the fields are completed or not
            var filledFieldCount = 0;
            filledFieldCount += $("[name='scheduledatepick[" + i + "]']", this).val().length > 0 ? 1 : 0;
            filledFieldCount += $("[name='schedulein[" + i + "]']", this).val() !== "--" ? 1 : 0;
            filledFieldCount += $("[name='location[" + i + "]']", this).val().length > 0 ? 1 : 0;
            
            // if the total completed fields for this row
            // is greater than none and less than all
            // then add the row to the invalid rows list
            if (filledFieldCount > 0 && filledFieldCount < 3) {
                rows.push(this);
            }
         });

    // finally, change the background of the
    // rows to mark them as invalid
    if (rows.length > 0){
        $(rows).addClass("error");
    }
    
});