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<!DOCTYPE html> <html> <body> <form> Select numbers:<br> <select id="no"> <option>0</option> <option>1</option> <option>2</option> <option>3</option> <option>4</option> <option>5</option> <option>6</option> <option>7</option> <option>8</option> <option>9</option> </select> <input type="button" onclick="myFunction()" value="-->"> <input type="text" id="result" size="20"> </form> <script> function myFunction() { var no = document.getElementById("no"); var option = no.options[no.selectedIndex].text; var txt = document.getElementById("result").value; txt = txt + option; document.getElementById("result").value = txt; } </script> </body> </html>