javascript - Loop through all the elements of select and add a blank option if the either of the items is null -


i have 2 drop downs select1 , select2. select item1 of select1 , click ok button ( case in need help)

then if selectedindex 0 ( ie first option )then loop through items of both drop downs.

if same index elements ( eg 3rd element of both drop downs)are not null execute code , if either of them null execute other code, how can achieve this?

<select name="select1" id="select1"  multiple size="10">     <option>1<option>     <option>null<option>     <option>null<option>     <option>2<option>     <option>3<option> </select> <select name="select2" id="select2"  multiple size="10">     <option>4<option>     <option>5<option>     <option>6<option>     <option>null<option>     <option>10<option> </select>

i tried code fiddle become unresponsive.

http://jsfiddle.net/678hmujh/13/

as can see in comments. not breaking loop after adding null when first match found.

http://jsfiddle.net/678hmujh/19/ works ok me.

 if (options1[i].text != "null" && options2[i].text != "null") {              $(sel1).append("<option value=''>null</option>");              $(sel2).prepend("<option value=''>null</option>");              return;          }

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