发布vs获取URL参数？

Question

I would like to give the user the ability to return to a previous page with pagination controls after submitting a form. Typically I use post but this will not pass the in the URL.

Is it recommended to use get instead?

Answer 1

It depends on a number of things, mainly what content you are passing through the form.

Generally if you have a textarea in the form, its a bad idea to send via GET as your much more likely to reach the max character limit of a URL. And obviously if your passing a file then it needs to be POST. Oh, and obviously if it's sensitive data (eg username/password) then using GET isn't a good idea.

Other than that I see no harm in using GET instead, as long as you are "cleaning" the data before using it anywhere.

If using GET isn't an option, then one thing you can do instead is use POST, but save everything in a COOKIE or SESSION variable for you to retrieve on the previous page if pagination/breadcrumbs are used after submitting the form.

Answer 2

Expanding a little on Alex and tandu's comments:

You should use POST when you are sending data the will change the state on the server. You should use GET when you request data or are performing some other action that will leave the server state unchanged.

So, Yes you are correct to use POST for submitting your form and GET is not recommended in this case.

Then after the post redirect the user to their previous page, perhaps after a short delay to view a thank you message.

Answer 3

Nothing prevents you from saving the pagination information in the form. For example you are at:

http://mysite/list.php?page=3&maxperpage=50

A link on the page can redirect the user to

http://mysite/edit.php?id=8475&page=3&maxperpage=50

Save the page and maxperpage as hidden controls into the form reloading them each time you show the form (in case of postback errors)

<input type="hidden" name="page" value="<?php echo $_REQUEST['page']; ?>" />
<input type="hidden" name="maxperpage" value="<?php echo $_REQUEST['maxperpage']; ?>" />

Then when the postback is complete, use the _POST hidden fields to redirect to that previous page:

header('location: http://mysite/list.php?page='.$_POST['page'].'&maxperpage='.$_POST['maxperpage']);

Obviously, i've skipped a lot of stuff in there such as validation so don't forget to put some in...