php - Cannot retrieve text box value in java script popup -

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i want pass text box value in parent.php popup window(child_page.php). following code. parent.php-

<html> <head> <script type="text/javascript">  var popupwindow=null;  function child_open() {   popupwindow =window.open('child_page.php',"_blank","directories=no, status=no, menubar=no, scrollbars=yes, resizable=no,width=600, height=280,top=200,left=200");  } function parent_disable() { if(popupwindow && !popupwindow.closed) popupwindow.focus(); } </script>   <input type="text" name="mytextfield" id="mytextfield" required="required"/>   </head> <body onfocus="parent_disable();" onclick="parent_disable();">     <a href="javascript:child_open()">click me</a> </body>      </html>

child_page.php

<h1>child page</h1>   <script>     window.onunload = refreshparent;     function refreshparent() {         window.opener.location.reload();     }     var x=parent.document.getelementbyid('mytextfield').value      <?php echo x; ?> </script>  <?php   //how textbox value here.      ?>

i googled , tried it. since know little java script couldn't pull answers solution.

there many errors in html. writing input element before closing head tag. move inside body. , try this:

<html> <head> <script type="text/javascript">      var popupwindow=null;      function child_open(val){          popupwindow =window.open('child_page.php' + "?val=" + val,"_blank","directories=no, status=no, menubar=no, scrollbars=yes, resizable=no,width=600, height=280,top=200,left=200");     }      function parent_disable() {         if(popupwindow && !popupwindow.closed)             popupwindow.focus();     } </script>  </head> <body onfocus="parent_disable();" onclick="parent_disable();">     <input type="text" name="mytextfield" id="mytextfield" required="required"/>     <a href="#" onclick="var val = document.getelementbyid('mytextfield').value; child_open(val);return false">click me</a> </body>      </html>

now in child_page.php can value using $_get['val'].

//child_page.php  <h1>child page</h1> <?php $x = $_get['val']; ?> <script>     window.onunload = refreshparent;     function refreshparent() {         window.opener.location.reload();     }    </script>  <?php echo $x; ?>

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