javascript - How to choose same option twice -

i open page, in dropdown selected option (value="26"), "rentdropdown" div not showing. how make appear if option selected page opening

<select name="prop_action_category" id="prop_action_category_submit"   class="select-submit2" onchange="toggle(this)"> <option value="" disabled selected style="display:none;">label</option> <option value="-1">none</option> <option class="level-0" value="26" selected="selected">1</option> <option class="level-0" value="28">2</option> </select>  <p class="half_form half_form_last" id="rentdropdown" style="display: block;">  <select name="property_label" class="cd-select">   <option value="">default</option>   <option value="/ 1">per month</option>   <option value="/ 2">per week</option>  </select> </p>  function toggle(el){           var value = el.options[el.selectedindex].value,           div = document.getelementbyid('rentdropdown');            if (value === '28' || value ==='-1') {               div.style.display = 'none';           } else if (value === '26') {               div.style.display = 'block';          }      }  

just call toggle function on page load:

toggle(document.getelementbyid('prop_action_category_submit'));