<aui:form name="myForm" action="<%=uploadPromotionURL %>" method="post" enctype="multipart/form-data">
<aui:input name="promotionName"  label="Promotion Name">
    <aui:validator name="required" errorMessage="This field can not be empty"/>
</aui:input>
<aui:input name="promotionDesc" label="Promotion Description"/>

<aui:input type="file" name="offerImages" label="Promotion Image" multiple="multiple" accept="image/*" onchange="setUploadSize(this)">
    <aui:validator name="acceptFiles">'jpg,png,tif,gif,jpeg'</aui:validator>
    <aui:validator name="required" errorMessage="Please chhose offer"/>
    <aui:validator name="custom" errorMessage="File size should not be more than 5Mb">
                        function(val,node,junction){
                            if(uploadSize==true){
                                return true;
                            }else{
                                return false;
                            }
                        }
                    </aui:validator>
</aui:input>

    <aui:select label="Promotion Assignment" id="promotionAssignmentId"
        helpMessage="Choose options" name="promotionAssignment"
        multiple="true">
        <c:forEach var="client" items="${clientList}">
            <aui:option value="${client.key}">${client.value }</aui:option>
        </c:forEach>
        <aui:validator name="required"
            errorMessage="Please Select At least One Client " />
    </aui:select>

    <aui:button type="submit" name="submit" value="submit" />