Run PHP function on html button click

Question

I need to run some PHP function when a button is clicked  I know this is not supposed to be php s use  rather js should do it  but what my functions are doing in gathering data from a server when the user asks it  Specifically  it gets some user data and writes it to a file  and the user should decide what data will be gathered  How can I do this  I saw the post Run PHP File On Button Click but I am still not sure how to use it  I m learning  so please don t be too harsh  I have tried onclick   and all sorts of things but it didn t lead to anything useful

User · Answer

Use an AJAX Request on your PHP file  then display the result on your page  without any reloading   http   api jquery com load  This is a simple solution if you don t need any POST data

User · Answer

If you want to make a server request you should use AJAX  so you can send your desired parameters to the server and it can run whatever php you want with these parameters   Example with pure javascript    lt input type  text  id  name  value        gt   lt input type  text  id  location  value        gt   lt input type  button  onclick  ajaxFunction     value  Submit    gt   lt div id  ajaxDiv  gt  lt  div gt   lt script type  text javascript  gt          function ajaxFunction            var ajaxRequest      The variable that makes Ajax possible           try                 Opera 8 0   Firefox  Safari             ajaxRequest   new XMLHttpRequest              catch  e                  Internet Explorer Browsers             try                  ajaxRequest   new ActiveXObject  Msxml2 XMLHTTP                  catch  e                    try                      ajaxRequest   new ActiveXObject  Microsoft XMLHTTP                      catch  e                          Something went wrong                     alert  Your browser broke                         return false                                                       Create a function that will receive data sent from the server         ajaxRequest onreadystatechange   function                if ajaxRequest readyState    4                   var ajaxDisplay   document getElementById  ajaxDiv                    ajaxDisplay innerHTML   ajaxRequest responseText                                  var name   document getElementById  name   value          var location   document getElementById  location   value          var queryString     name     name     amp location     location          ajaxRequest open  POST    some php    queryString  true           ajaxRequest send null           lt  script gt    Example with jQuery Ajax  http   api jquery com jQuery ajax     ajax     type   POST     url   some php     data    name   John   location   Boston       done function  msg       alert   Data Saved      msg          You can have one file with functions called for example functions php  functions php   lt  php   myFunction  Name   Location             etc          myFunction2                  many functions   gt    some php   lt  php include  functions php         Name     POST  name     Location     POST  location     myFunction  Name   Location       make what you want with these variables     gt

User · Answer

Use ajax  a simple example   HTML   lt button id  button  gt Get Data lt  button gt    Javascript  var button   document getElementById  button     button addEventListener  click  ajaxFunction  false    var ajaxFunction   function             ajax code here     Alternatively look into jquery ajax http   api jquery com jQuery ajax

User · Answer

It depends on what function you want to run  If you need something done on server side  like querying a database or setting something in the session or anything that can not be done on client side  you need AJAX  else you can do it on client-side with JavaScript  Don t make the server work when you can do what you need to do on client side   jQuery provides an easy way to do ajax   http   api jquery com jQuery ajax

User · Answer

lt  php if  isset   POST  str      function printme  str   echo  str     printme     POST  str           gt   lt form action   lt  php   PHP SELF   gt   method  POST  gt   lt input type  text  name  str    gt   lt input type  submit  value  Submit   gt   lt  form gt

User · Answer

A php file is run whenever you access it via an HTTP request be it GET POST  PUT   You can use JQuery Ajax to send a request on a button click  or even just change the URL of the browser to navigate to the php address   Depending on the data sent in the POST GET you can have a switch statement running a different function   Specifying Function via GET  You can utilize the code here  How to call PHP function from string stored in a Variable along with a switch statement to automatically call the appropriate function depending on data sent   So on PHP side you can have something like this    lt  php    see http   php net manual en function call-user-func-array php how to use extensively if isset   GET  runFunction     amp  amp  function exists   GET  runFunction     call user func   GET  runFunction     else echo  Function not found or wrong input    function test     echo  test       function hello     echo  hello         gt    and you can make the simplest get request using the address bar as testing   http   127 0 0 1 test php runFunction hellodddddd   results in   Function not found or wrong input  http   127 0 0 1 test php runFunction hello   results in   hello   Sending the Data  GET Request via JQuery  See  http   api jquery com jQuery get     get  test cgi     name   John     done function data      alert  Data Loaded      data         POST Request via JQuery  See  http   api jquery com jQuery post     post  test php     name   John        GET Request via Javascript location  See  http   www javascripter net faq buttonli htm   lt input type button  value  insert button text here  onClick  self location  Your URL here php name hello   gt    Reading the Data  PHP   See PHP Turotial for reading post and get  http   www tizag com phpT postget php  Useful Links  http   php net manual en function call-user-func php http   php net manual en function function-exists php

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