webforms - javascript window redirect doesn't fire up -

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this problem seems odd me , can't seem fix it. have simple html form; inside, have textbox , button shown down here:

<form id="form1" method="get"> <!-- note: no action property -->     <div>        <h1>            simple test form</h1>        <table border="0" width="400">            <tr>                <td align="right">                    of these words                </td>                <td>                    <input name="txtall" id="txtall" type="text" value="testing keyword" />                </td>            </tr>            <tr>                <td colspan="2" align="center">                    <input type="submit" name="submit" value="submit" onclick="myjs(this);" />                </td>            </tr>        </table>    </div> </form>

myjs file as:

<script type="text/javascript">     function myjs(which) {         var constant_site_target = "http://servername/redirect/target.aspx?text=";          //capture values form         var allwords = document.getelementbyid("txtall").value;          var morestring = ""; //more data manipulation here.....         var url = constant_site_target + allwords + morestring;          window.open(url);         //window.location = url;          //doesn't work         //window.location.href = url;     //doesn't work         //self.location = url;            //doesn't work         //top.location = url;             //doesn't work     } </script>

as can see, doesn't redirect designated url in javascript. when use window.open works. note in < form... > tag, don't put action property in it. don't want open new browser, redirect new url within same browser.

is there way redirect it?

here

function myjs(which) {     var constant_site_target = "http://servername/redirect/target.aspx?text=";      //capture values form     var allwords = which.txtall.value;      var morestring = ""; //more data manipulation here.....     return constant_site_target + allwords + morestring; }   <form id="form1" method="get" onsubmit="this.action=myjs(this)"> <div>     <h1>         simple test form</h1>     <table border="0" width="400">         <tr>             <td align="right">                 of these words             </td>             <td>                 <input name="txtall" id="txtall" type="text" value="testing keyword" />             </td>         </tr>         <tr>             <td colspan="2" align="center">                 <input type="submit" name="submit" value="submit" />             </td>         </tr>     </table> </div> </form>

to elaborate on comment:

<script> window.onload=function() {   document.getelementbyid("submit").onclick=function() {      var constant_site_target = "http://servername/redirect/target.aspx?text=";     //capture values form     var allwords = document.getelementbyid("txtall".value;     var morestring = ""; //more data manipulation here.....     location = constant_site_target + allwords + morestring;   } } </script> <div>     <h1>         simple test form</h1>     <table border="0" width="400">         <tr>             <td align="right">                 of these words             </td>             <td>                 <input name="txtall" id="txtall" type="text" value="testing keyword" />             </td>         </tr>         <tr>             <td colspan="2" align="center">                 <input type="button" id="submit" value="submit" />             </td>         </tr>     </table> </div>

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