仅当字段包含值时,Bootstrap才会进行验证

Bootstrap validate only if field contain value

I would like to only use my bootstrap validator if

I got this code below that use bootstrap validator

<tr>
<td><b>1</b></td>
<td>
<select class="form-control" name="DaySelection1">
<option value="">Select</option>
<option value="wed">Wed</option>
<option value="thu">Thu</option>
<option value="fri">Friday</option>
</select>
</td>

<td class="form-group">
<input type="text" class="form-control" name="digits1"
                required
                min="000"
                data-bv-greaterthan-inclusive="true"
                data-bv-greaterthan-message="The input must be greater than or equal to 0"

                max="999"
                data-bv-lessthan-inclusive="false"
                data-bv-lessthan-message="The input must be less than or equal to 999" />
</td>
<td class="form-group"><input type="number" data-bv-digits-message="true" class="form-control" name="big1" id="name1" size="6"></td>
<td><input type="number" class="form-control" name="small1" size="6"></td>
</tr>

I would only like to run my validate on the row that the

select class by the name "DaySelection" value is not "" 

The name of each input is goes by e.g "digits$i", "big$i", "small$i"

where $i is a integer of

1 to 10

to identify each individual row of input type

How do I change my bootstrap code.

Because currently I got a for loop that print out the same field, those field that are not filled up also got this validation done, I only want to validate row that got DaySelection value

I use

data-bv-threshold="1" 

to solve my issue.