javascript - How to check if a select field has a certain option value without jQuery -


how check if option particular value exists in select field?

<select>   <option value="o1">option 1</option>   <option value="o2">option 2</option> </select>

if select has value "o1" = true

if select has value "o4" = false

you can loop on options , check values:

var select = document.getelementbyid('selectid') ||               document.forms[formname or index].elements[selectname or index]; var options = select.options  (var i=0, ilen=options.length; i<ilen; i++) {   if (options[i].value == 'foo') {     // found option value 'foo'   } }

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