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Javascript to triger submit button

TrialUser asked
Last Modified: 2015-10-28
When user clikcs enter insid a textbox, I want to triger the submit button click, Ihave the following code but code inside if is not executed. Please help.

  <script lang="javascript" type="text/javascript">
        window.onload = function () {
        function jftnSubmit(e) {
             if (e.keycode == 13) {
                alert('d enter f');
                var ButtonID = btnLogin.id;
             return false;

 <input id="txtUserName" autofocus  runat="server" type="text"
                        class="form-control" placeholder="Username" maxlength="50" onclick="jftnSubmit(event); " />
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