PHP, HTML: Submit form automatically

Question

I have a PHP page with an HTML form on it. If some variables are set in the URL I would like to automatically submit the form on the page.

IE:

if (isset($_GET['var']))
{
  // SUBMIT FORM
}
else
{
  // leave the page alone
}

EDIT:

Here is what I have using the answer that someone provided below, but it's still not working. I would like the form to submit itself if the condition is met.

<?php

if ($r == 1)
{

echo "  
  <br>
   <form action=\"bookRoom.php\" method=\"post\" id=\"dateForm\">
    <input name=\"from\" type=\"hidden\" value=\"$fday/$fmonth/$fyear\">
    <input name=\"to\" type=\"hidden\" value=\"$tday/$tmonth/$tyear\">
    <input type=\"submit\">
   </form>

  <script type=\"text/javascript\">
    $('#dateForm').submit();
  </script>
";      
}
?>

Solution 1

Using pure javascript instead of jQuery :

<?php
    if (isset($_GET['var']))
{?>

<script type="text/javascript">
    document.getElementById('dateForm').submit(); // SUBMIT FORM
</script>

<?php 
}
else
{
  // leave the page alone
}
?>

Solution 2

I think you want this:

<?php
if (isset($_GET['var']))
{?>

<script type="text/javascript">
document.getElementById("formid").submit(); // Here formid is the id of your form
                           ^
</script>

<?php }
else
{
  // leave the page alone
}
?>

Comments

[Lawrence Cherone]

native javascript would suffice, no need for jQuery

[Reeno]

Be careful, this only works with a JavaScript framework which accepts $('#formid')

[Juicy]

It seems mine doesn't accept it. I apologize for my ignorance but I know very little about javascript. How can I get a framework that supports $('#formid') ?

[Moeed Farooqui]

@user2018084 Framework?? Buddy It is jQuery a library of javascript well I have edited my answer and converted jQuery to javascript.See my updated answer

[Moeed Farooqui]

@user2018084 Hope this will help you

[Adam]

what is meant with //leave the page alone. Is there any important code?

[Charaf JRA]

@Adam that was part of his example, it's a copy past