如何将exec输出显示到文本区域

Question

I have a page where on button click, calls a javascript function that executes the following:

 <?php $i = exec('/etc/init.d/iptables status'); ?>

  document.getElementById('txtArea').innerHTML += <?php echo $i; ?>;

but the text area stood empty,
any advice or solution?

Answer 1

PHP output into HTML:

<textarea><?php echo shell_exec('/etc/init.d/iptables status'); ?></textarea>

PHP output into HTML, but in form of a Javascript Value Update on the Textarea element:

<textarea id="txtArea">...</a>
<script>
document.getElementById("txtArea").value = "<?php echo shell_exec('/etc/init.d/iptables status'); ?>";
</script>

But i doubt, that you want this.

So, finally the whole thingy again, but now with a button as the trigger for a JS/jQuery Ajax Get request:

<textarea id="txtArea">...</a>

<input type="button" id="txtAreaUpdateButton" value="Update Textarea"/>

<script>
$(document).ready(function() {
   $('#txtAreaUpdateButton').click(function() {
      $.ajax({ 
          type: "GET",
          url: "http://www.yoursite.com/request.php",//get response from this file
          success: function(response){ 
            $("textarea#txtArea").val(response); // update textarea with response
        }
      });
   });
});
</script>

Here 'request.php' contains:

<?php echo shell_exec('/etc/init.d/iptables status'); ?>

Keep an eye on the quotes. They are often the source for errors.