jquery - how to add selected in select multiple in javascript -


i want you. have select box multiple want add option attribute selected when clicking on self-option 

                <select multiple  name="system" class="form-control system">                     <option value="windows"> windows </option>                     <option value="linux">  linux </option>                     <option value="macos"> macos </option>                     <option value="freebsd"> freebsd </option>                 </select>

use selected attribute in option want select selected

example: select windows , macos

<select multiple  name="system" class="form-control system">   <option value="windows" selected> windows </option>   <option value="linux">  linux </option>   <option value="macos" selected> macos </option>   <option value="freebsd"> freebsd </option> </select>

using javascript can achieve in way,

give different class name each option, like

<option value="windows" selected class="o1" > windows </option> <option value="macos" selected  class="o2"> macos </option>

now option javascript , check below,

getelementsbyclassname("o1").selected = true; getelementsbyclassname("o2").selected = true;

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