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Empty Value In A Form Dropdown


Think that we have one dropdown form where we can choose countries from like this.

<select name="country" id="dropdown">
<option value="Choose country">Choose</option>
<option value="USA">USA</option>
<option value="CANADA">CANADA</option>


IF I have an SELECT I can easily set country = '$country' IF user have choosen some country, but when user not choose any country the selected one is "choose", is it possible do add All countries to $country so the SELECT formula include all countrys and not just get empty? 




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