JQuery: how to check if checkbox is checked and add attributes to field

I'm trying to check whether a check box is checked, and if it is checked, then I want to add the "required" attribute to an adjacent text field. I've tried it two different ways with no success. Here are the form elements and my two JQuery attempts.

neither of those will actually trigger the event. My browser either does nothing at all or triggers an "Empty string passed to getElementById()." event

Form elements:

  <div class="col-sm-5">
            <label id="checkboxNumber-label" class="toplabel" for="checkboxNumber">Checkbox</label>
            <g:textField name="checkboxNumber" value="${...checkboxNumber}" class="form-control" required="" aria-labelledby="checkboxNumber-label"/>
            <label class="checkbox-inline">
                <g:checkBox name="checkboxYesNo" id="checkboxYesNo" value="${...checkboxYesNo}" onclick="chkboxYesChecked()"/> 
            </label>
        </div>
        <div class="col-sm-5">
            <label id="someTextField-label" class="toplabel" for="someTextField">Some Text Field Here</label>
            <g:textField name="someTextField" id="someTextField" value="${...someTextField}" class="form-control" aria-labelledby="someTextField-label"/>
        </div>

JQuery:

function chkboxYesChecked(){
        if($('#checkboxYesNo').prop('checked')){
            $('#someTextField').prop('required',true);
            $('#someTextField').append('<span class="required-indicator">*</span>');
        }else{
            $('#someTextField').removeAttr('required');
        }
           }


$(document).ready(function() {    
    $('#checkboxYesNo').click(function() {
        if($(this).is(":checked"))
        {
            $('#someTextField').prop('required',true);
            $('#someTextField').append('<span class="required-indicator">*</span>');
        } else {
            $('#someTextField').removeAttr('required');
        }
    });
});