jquery - Add new items to a Html selectbox -

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Can I check in the html selection box for existing items, while adding them The user types a text in an input box and then clicks the button to add the item. But before I connect, I want to check identical objects, is there an effective method of writing this script?

if $ ('# dropdown option [Value =' + newoption + ']') An option returns or not.

Example 

  if ($ ('# dropdown option [value =' + new + + ']'). Length & gt; 0) {// options exist . } And {// options do not exist}

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