After form submission want to show success message in the form page

You need to pass the variable and its value in GET method to display the success message which you’re already doing.

Now, in your PHP file, display a message based on the GET parameter and its value.

if($_GET['message'] == 'success'){ 
  //display your message 
}

Related Posts:

  1. Disable email notification after change of password
  2. Simple form that saves to database
  3. Disabling Comment Notifications for Post Author
  4. Get selected values from checkboxes and radio buttons via Gravity Forms gform_after_submission hook [closed]
  5. How to notify users of blog updates a la Admin Plugin Update notifications?
  6. Trying to add admin file upload form plugin
  7. How to disable autocomplete for inputs in contact form 7? [closed]
  8. WordPress Custom Application form
  9. When is it useful to use wp_verify_nonce
  10. Datepicker not supporting timepicker
  11. add function to saving change on Options Pages
  12. PGP-Encrypt system-generated notifications
  13. Admin page: form with enctype=”multipart/form-data” does not transfer its data
  14. Hook into and send mail using WP Mail SMTP type plugin from HTML static front page?
  15. Custom form action to handle data inside a plugin
  16. wp_create_nonce function doesn’t work inside a plugin?
  17. Form isn’t inserting data into database with ajax plugin
  18. New User Form – Custom Menu Page
  19. WordPress independent plugin upgrade notification system [duplicate]
  20. Anonymous Postings
  21. Facebook-like Notification Plugin for WordPress Community Blog Sites?
  22. Contributive page where people logged in can write
  23. Contact Form 7 Get Image Function [closed]
  24. Submit page limited in time to upload image
  25. Is there any way to use google input tool or any other language keyboard with WordPress [closed]
  26. Take input from form and pass it to function using a wp-plugin
  27. Checkbox conflict in my custom plugin admin page
  28. Trying to fix form resubmition with PRG (Getting error: Cannot modify header information – headers already sent by)
  29. WP Plugins – Use includes to display page content
  30. Plugin to create forms using HTML [closed]
  31. How to allow user to select User ID in Formidable Pro form? [closed]
  32. AJAX fileupload – TypeError: not a function ajaxSubmit()
  33. Is there a way to embed a Google Docs form in a page without using plugins?
  34. Detailed form plugin, with ability to export to excel etc. OR edit PDF live? [closed]
  35. Modify wp_installed_email / wp_new_blog_notification
  36. Submit Form data to another page via Ajax (WordPress Way)
  37. How can ι create my own (custom) WordPress table/list?
  38. Sell access to form [closed]
  39. File Uploader – Upload without adding to Media Library
  40. Custom form not showing in correct place on page
  41. How to redirect to a page after the form is submitted
  42. Call another page in forms
  43. How to Use the Filter “sidebar_login_widget_form_args”
  44. Is it save to replace with in WordPress search form
  45. Contact Form 7 Plugin emails not being received by some accounts
  46. Plugin for visitors to edit content without logging in? [closed]
  47. How do I send the contents of a form to deliver to the already existing custom field in the wordpress theme
  48. How to customize maintenance mode notification in wordpress?
  49. Linking form to user meta fields
  50. WordPress Forms Advance Conditional Logic
  51. User loggedin as Subscriber form not sending
  52. login form should redirect to register page for in 1st login next time it should redirected to home page
  53. How to get data from a form on a wordpress site?
  54. Submitting form to PHP
  55. General Term for this form Field
  56. wp_set_password() does not work!
  57. Custom Formdata matching with user table
  58. Hide button after form submit and save state to localstorage
  59. Meta Key array building with multiple input values from fields
  60. Creating posts with acf_form() that has a relationship type field
  61. Plugin to manage form submissions on admin panel
  62. How to send custom mail when a user complete a specific form
  63. How to submit custom form data using ajax to HubSpot form?
  64. Ajax call to php function doesn’t work PHP code
  65. submit form data to wordpress existing database table using my plugin
  66. Pause form submissions while upgrading plugins
  67. Custom User Notice Upon Login
  68. How to hide the form after successful php execution
  69. How can I automatically send an email with an excel file containing submissions for a form rather than an email per submission?
  70. Mobile Notification on a blog post
  71. Why doesn’t a form need an ‘action’ with a plugin that uses the post data?
  72. $POST variable is empty in receiving php add-on function but can be seen by jscript function
  73. WP_Filesystem usage within a block of code
  74. I created a custom form in HTML/CSS and now I need it to submit … should I create custom PHP or is there a plugin I can use?
  75. Include plugin form in the home page
  76. How can i see/log all requests coming from a registration form (not from the UI)?
  77. Form submit from wordpress plugin
  78. Saving custom form fields
  79. How do I convince this button to do something when it is clicked?
  80. wordpress option page data from select form is not saving to database
  81. Linking Plugin Files to WP
  82. Adding a Filter to Sidbar Login Plugin to Change Login Button Lable
  83. Carrying information from button click into form [closed]
  84. Custom Form only for admin
  85. County Finder form/plugin?
  86. Creating fields in the database
  87. Allow users to enter and edit data in one-to-many configuration
  88. How to develop an extension for a simple form post and post back? [closed]
  89. Can’t edit Contact Us form on front page
  90. Trying to disable all notifications except for one on woocommerce checkout page with css [closed]
  91. Notifications on WordPress Website [closed]
  92. Build a Boat Form Plugin [closed]
  93. Notifications Bar on home page only
  94. How to get an error message if a form is empty (plugin: Post for site) [closed]
  95. how to show selected options drop down menu values in attributes field in after saving post.php
  96. How to Allow Users to Select Recipients In a WordPress Comment section?
  97. Form with response button after on table after submission
  98. Tips on using a custom template with Ultimate Member
  99. Can’t save formdata in DB
  100. Display file contents within Plugin