问如何为JavaScript生成的textbox附加onclick事件？

EN

<input  class="date_size_enquiry" type="text" autocomplete="off"
onclick="displayDatePicker('attendanceDateadd1');" size="21" readonly="readonly"    
maxlength="11" size="11"  name="attendanceDateadd1" id="attendanceDateadd1" 
value="" onblur="per_date()" onchange="fnloadHoliday(this.value);">

    var cell2 = row.insertCell(1);
    cell2.setAttribute('align','center')
    var el = document.createElement('input');
    el.className = "date_size_enquiry";
    el.type = 'text';
    el.name = 'attendanceDateadd' + iteration;
    el.id = 'attendanceDateadd' + iteration;
    el.onClick = //How to call the function displayDatePicker('attendanceDateadd1');
    e1.onblur=??
    e1.onchange=??
    cell2.appendChild(el);