如何在PHP echo中调用javascript函数/编写脚本

Question

I have written piece of code, below is the code

<script type="text/javascript">
function submitform()
{
    document.myform.action='http://mysite/index.php';
    document.myform.submit();
}
</script>

<?php
if(isset($_POST['submit_details']))
{
       echo "<script typ=javascript> submitform();</script>";
}

?>
<form id="myform">
  ------
  ------
<input type="submit" name="submit_details">
</form>

when i try to submit the form , it gives me error document.myform is undefined, how to solve this error

Answer 1

document.myForm is undefined when you are calling the script because it is being run before the form element has been received by the browser. You need to put the script after the form tag, or use a document.onload event handler (or similar).

(Although quite why you want to automatically and immediately submit a form by JS without your user doing anything is beyond me.)

Answer 2

If that's literally your code, then it's got syntax errors up the wazoo.

Try:

<?php if (isset($_POST['submit_details'])) { ?>
   <script type="text/javascript">submitForm();</script>
<?php } ?>

Answer 3

Try moving the script to the bottom of the page, or better, listen to the window.onload event. When the script is loaded by the browser, the DOM hasn't finished loading and cannot find document.myForm yet.

Answer 4

Why dont you just put the javascript submit inside the input like so?

<input type="submit" name="submitdetails" onclick="javascript:submitform();" />

Then use $post with jquery to run the page.