how to write javascript code inside php

Question

i have a got a form  on clicking the submit button    I want to do some task in the same file  db task  AND I want the form data to be sent to test php with the redirection   here is my code       lt  php     if isset   POST  btn                do some task       gt       lt script type  text javascript  gt          var e   document getElementById  testForm    e action  test php   e submit    lt  script gt       lt  php             gt   lt form name  testForm  id  testForm   method  POST    gt       lt input type  submit  name  btn  value  submit  autofocus  onclick  return true    gt    lt  form gt    but not able to submit the form  if i call the javascript code on onClick  it works what is the problem in this code  Is there any work around for this

User · Answer

You can put up all your JS like this  so it doesn t execute before your HTML is ready    document  ready function           some code here        Remember this is jQuery so include it in the head section  Also  see Why you should use jQuery and not onload

User · Answer

At the time the script is executed  the button does not exist because the DOM is not fully loaded  The easiest solution would be to put the script block after the form   Another solution would be to capture the window onload event or use the jQuery  library  overkill if you only have this one JavaScript

User · Answer

Just echo the javascript out inside the if function    lt form name  testForm  id  testForm   method  POST    gt        lt input type  submit  name  btn  value  submit  autofocus  onclick  return true    gt    lt  form gt    lt  php     if isset   POST  btn              echo                lt script type   text javascript   gt              var e   document getElementById  testForm    e action  test php   e submit                 lt  script gt                        gt

User · Answer

Lately I ve come across yet another way of putting JS code inside PHP code  It involves Heredoc PHP syntax  I hope it ll be helpful for someone    lt  php  script    lt  lt  lt  JS    function           js code goes here      JS    gt    After closing the heredoc construction the  script variable contains your JS code that can be used like this    lt script gt  lt     script   gt  lt  script gt    The profit of using this way is that modern IDEs recognize JS code inside Heredoc and highlight it correctly unlike using strings  And you re still able to use PHP variables inside of JS code

[php] how to write javascript code inside php

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