How to prevent reposting of values

[KeredDrahcir]

I'm working on a php program and I need to post values and use the posted values to update the session vaiables but if a user clicks back or refresh it can repost the values and since the values need to be incremented to I add them on, if this happens them it can upset the values.

Is there a way to prevent this from happening?

[dlite922]

No. You need to code with this mind. (i.e. the user can ping your page multiple times). You must code to not upset your values.


DM

[KeredDrahcir]

If I set a session variable and a user clikcs on refresh, or back, what happens to the session variable. Does it stay the same?

[KeredDrahcir]

Can anuone help me with what happens to session variables when you clikc back or refresh?

[dlite922]

it stays the same.

Read the PHP manual: http://us3.php.net/manual/en/intro.session.php

Dan

[KeredDrahcir]

Okay thanks. In that case I can set the a session varuable that will increment when it loads the next function and then if they click back, or refresh, it will be a wrong number and it will know not to change any values.

Do you think that will work?

[KeredDrahcir]

Is there anything I can do to prevent values from being reposted using JavaScript or is there anything I can do using JavaScript thatg will tell me if they've just clicked on Refresh or Back aso I can undo a multiple submission.

[Chris T]

try to use ajax + jquery form submit implementation. Even if a user clicks on back or refresh the page it won't send that values.

[KeredDrahcir]

I'm going to store the ID number of the function in a Session variable. Then if they click refresh of back there will be a mismatch. Is there any other way a mismatch could occur or could this work?