Tryit Editor v1.4

<html> <head> <script type="text/javascript"> function getLength() { alert(document.getElementById("mySelect").length); } </script> </head> <body> <form> <select id="mySelect"> <option>Apple</option> <option>Pear</option> <option>Banana</option> <option>Orange</option> </select> <input type="button" onclick="getLength()" value="How many options in the list?"> </form> </body> </html> | Your Result:
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