Question

I have a table, has many rows. for example one of from rows(all rows are same):

             <tr>
                <td>
                    <input type="text" />
                </td>
                <td>
                    <textarea cols="40" rows="3" ></textarea>
                </td>
                <td>
                    <select id="chbTypes11">
                        //options
                    </select>
                </td>
                <td>
                    <input type="text" />
                </td>
                <td>
                    <input type="checkbox" />
                </td>
            </tr>

select element is disabled by default.
How to determine, input value has value? for enabling select element in this row

Answer 1

If by ‘input’ you mean any kind of input element other than a select, then:

$("tr input, tr textarea").change(function() {
    var $select = $(this).closest("tr")
                         .find("td > select");
    $select.attr("disabled", !($.trim(this.value).length > 0));
});

// IE and checkbox change events don't like each other
$("tr :checkbox").click(function() {
    $(this).closest("tr").find("td > select")
                         .attr("disabled", !$(this).is(":checked"));
});

If you’re only referring to the textbox, just change the selector to $("tr input:text")