How can I tell which button was clicked in a PHP form submit

Question

I have several buttons on my page  but I m not sure how to tell which one was clicked  Here s the markup for my two buttons    lt input type  submit  id  btnSubmit  value  Save Changes    gt   lt input type  submit  id  btnDelete  value  Delete    gt

User · Answer

Are you asking in php or javascript   If it is in php  give the name of that and use the post or get method  after that you can use the option of isset or that particular button name is checked to that value   If it is in js  use getElementById for that

User · Answer

In HTML    lt input type  submit  id  btnSubmit  name  btnSubmit  value  Save Changes    gt   lt input type  submit  id  btnDelete  name  btnDelete  value  Delete    gt    In PHP   if  isset   POST  btnSubmit            Save Changes  clicked   else if  isset   POST  btnDelete            Delete  clicked

User · Answer

All you need to give the name attribute to the each button  And you need to address each button press from the PHP script  But be careful to give each button a unique name  Because the PHP script only take care of the name most of the time   lt input type  submit  name  Submit this  id  This    gt

User · Answer

With an HTML form like    lt input type  submit  name  btnSubmit  value  Save Changes    gt   lt input type  submit  name  btnDelete  value  Delete    gt    The PHP code to use would look like   if    SERVER  REQUEST METHOD        POST            Something posted      if  isset   POST  btnDelete                  btnDelete       else              Assume btnSubmit           You should always assume or default to the first submit button to appear in the form HTML source code  In practice  the various browsers reliably send the name value of a submit button with the post data when    The user literally clicks the submit button with the mouse or pointing device Or there is focus on the submit button  they tabbed to it   and then the Enter key is pressed    Other ways to submit a form exist  and some browsers versions decide not to send the name value of any submit buttons in some of these situations  For example  many users submit forms by pressing the Enter key when the cursor focus is on a text field  Forms can also be submitted via JavaScript  as well as some more obscure methods   It s important to pay attention to this detail  otherwise you can really frustrate your users when they submit a form  yet  nothing happens  and their data is lost  because your code failed to detect a form submission  because you did not anticipate the fact that the name value of a submit button may not be sent with the post data   Also  the above advice should be used for forms with a single submit button too because you should always assume a default submit button   I m aware that the Internet is filled with tons of form-handler tutorials  and almost of all them do nothing more than check for the name and value of a submit button  But  they re just plain wrong

[php] How can I tell which button was clicked in a PHP form submit?

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