Why are there extra parameters x and y on my GET request?

Question

When I hit the submit image I get some extra parameters in the GET request:

main.php?selected=user_manager_main&mode=set_active&set_this_id=13&x=4&y=7

Please note the x and y at the end. I certainly did not define the x and y at the end. The values seem to be random. Here is the form code:

echo '<form action ="main.php" method="get">';
echo '  <input type="hidden" name="selected" value="user_manager_main" />';
echo '  <input type="hidden" name="mode" value="set_inactive" />';
echo '  <input type="hidden" name="set_this_id" value="'.$row['USER_ID'].'" />';
echo '<input type="image" src="images/delete.gif" alt="Submit" />';
echo '</form>';

Any ideas? Thanks!

Answer 1

It's all ok. Look at:

http://www.w3.org/TR/html401/interact/forms.html#h-17.4.1

When a pointing device is used to click on the image, the form is submitted and the click coordinates passed to the server. The x value is measured in pixels from the left of the image, and the y value in pixels from the top of the image. The submitted data includes name.x=x-value and name.y=y-value where "name" is the value of the name attribute, and x-value and y-value are the x and y coordinate values, respectively.

Answer 2

It's the x and y coords of where the user clicked on your image input

Answer 3

It's not random. In IE, when you submit an input image, you get the coordinates where you cicked on the image.