Updating data in input filed

Hi Iam new to WD java i have one issue ie,
I have one input field name is FIRST in that I will select one value u2026..  and I have other input filed that is SECOND I will select one value Based on this two fields I have one more filed called THIRD. when ever I select the above values the related account number will be coming from backend u2026..
Now the problem after entering the data atlast when we update the filed with new data in First filed automatically the THIRD filed which consists of data should be blank
can you please tell me the logic of this how to do in terms of coding pls ....
Thanks in Advance

There is "onEnter" event for Input UI element. Write an action and set this action for "onEnter" event of the FIRST input field . In this action, set the context attribute for the THIRD Input field to empty string "".
Hope this helps. If possible, give more details so that someone else may have a better answer.

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            out.println("<option>March</option>");
            out.println("<option>April</option>");
            out.println("<option>May</option>");
            out.println("<option>June</option>");
            out.println("<option>July</option>");
            out.println("<option>August</option>");
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            out.println("<option>October</option>");
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            out.println("<option>December</option>");
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            out.println("<select name=tyear size=1 id=tyear>");
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            out.println("<option>2006</option>");
            out.println("<option>2007</option>");
            out.println("<option>2008</option>");
            out.println("<option>2009</option>");
            out.println("<option>2010</option>");
            out.println("<option>2011</option>");
            out.println("<option>2012</option>");
            out.println("<option>2013</option>");
            out.println("<option>2014</option>");
            out.println("<option>2015</option>");
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            out.println("<option>3</option>");
            out.println("<option>4</option>");
            out.println("<option>5</option>");
            out.println("<option>6</option>");
            out.println("<option>7</option>");
            out.println("<option>8</option>");
            out.println("<option>9</option>");
            out.println("<option>10</option>");
            out.println("<option>11</option>");
            out.println("<option>12</option>");
            out.println("<option>13</option>");
            out.println("<option>14</option>");
            out.println("<option>15</option>");
            out.println("<option>16</option>");
            out.println("<option>17</option>");
            out.println("<option>18</option>");
            out.println("<option>19</option>");
            out.println("<option>20</option>");
            out.println("<option>21</option>");
            out.println("<option>22</option>");
            out.println("<option>23</option>");
            out.println("<option>24</option>");
            out.println("<option>25</option>");
            out.println("<option>26</option>");
            out.println("<option>27</option>");
            out.println("<option>28</option>");
            out.println("<option>29</option>");
            out.println("<option>30</option>");
            out.println("<option>31</option>");
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            out.println("<select name=rmth size=1 id=rmth>");
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            out.println("<option>February</option>");
            out.println("<option>March</option>");
            out.println("<option>April</option>");
            out.println("<option>May</option>");
            out.println("<option>June</option>");
            out.println("<option>July</option>");
            out.println("<option>August</option>");
            out.println("<option>September</option>");
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            out.println("<option>November</option>");
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            out.println("<select name=ryear size=1 id=ryear>");
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            out.println("<option>2007</option>");
            out.println("<option>2008</option>");
            out.println("<option>2009</option>");
            out.println("<option>2010</option>");
            out.println("<option>2011</option>");
            out.println("<option>2012</option>");
            out.println("<option>2013</option>");
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            String nam = request.getParameter("nam");
            String ic = request.getParameter("IC");
            String jday = request.getParameter("jday");
            String jmth = request.getParameter("jmth");
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