Custom HTML form using PHP – help with ajax/username validation

This is how I got AJAX working for me.

  1. I digested this tutorial. https://codex.wordpress.org/AJAX_in_Plugins

  2. I created an external JS file and enqueued after jQuery because of its dependency on jQuery.

  3. I created a PHP function to respond to the AJAX call by echoing what was sent.

  4. When that worked, I made the PHP function send the data I needed.

I think what you have should work. If the let declaration gives you an error, try it with var instead. This is stupid, I know, but if var doesn’t work then the error is in the right side of the expression.

I would replace url: '<WP_AJAX_URL_HERE>' with ajaxurl and see if that helps.

Related Posts:

  1. How to store data from multiple forms using ajax and php
  2. WordPressUser Submission Form
  3. add_filter the_content str_replace after shortcode
  4. WordPress Ajax always returns a 404 error
  5. Load custom field value into div with AJAX
  6. Custom WordPress+PHP+MYSQL+AJAX form, submit event not captured by Javascript, but does POST data to the DB
  7. Ajax form submit within a Post Metabox
  8. Upload Image in a WordPress page using PHP
  9. Load a page into a div with Ajax
  10. My form action url is being prepended with a directory that does not exists
  11. Ajax loaded form replaces form action with Ajax url
  12. prevent default not stopping page refresh. Passing form information to and from php with ajax in a wordpress site
  13. Ajax call return 404
  14. Why Won’t My Inputs in a form with a Get method work together?
  15. Input data from email form not going to JSON file
  16. How to get the value of input hidden html from text editor to custom page template?
  17. Show success or error messages in Ajax response to WordPress custom registration form
  18. Login to wordpress by clicking a link and specifying usernaname and password in url
  19. WordPress admin-ajax.php 400 bad request
  20. Ajax contact form return 0
  21. Search WordPress using static html page
  22. HTML escaping data with ajax requests
  23. How to execute html code inside php?
  24. Submitting a form, using Ajax, to run a SQL Select query based on user input from the form
  25. How to add post meta in while loop?
  26. Adding attribute to the post.php form tag in wp-admin
  27. Custom forms with HTML
  28. custom add note meta box with add button in wordpress
  29. Contact form – problem with displaying message about sent mail
  30. Using Ajax to submit a form, and run a SQL Select query based on user input from the form
  31. Cascading dropdown select search based on Parent Page & Child Page
  32. WordPress cascading dropdown selection search based on Parent Page & Child Page
  33. Display WordPress search results based on the selected Sub-Category
  34. HTML Form Question
  35. How do I call a value from the datase using ajax
  36. How to change this ajax function to submit to the default wordpress content area instead of the custom field ‘seller notes’?
  37. How to use wp_ajax_set_post_thumbnail?
  38. AJAX and custom pages
  39. wordpress form action page not found
  40. Pass form attributes to another php template in wordpress
  41. Code works on page-example.php by not category-example.php
  42. Submitting my form to the database and then redirecting to payment site
  43. Ajax call URL 404’ing when pushed to staging server
  44. Pass the updated value of aid from form using ajax
  45. Data inserted in database, but ajax calls error function
  46. ajax form function error
  47. Load Meta box value into div AJAX [duplicate]
  48. Word press – JSPDF – Sending PDF as attachment from wp_mail – Special characters
  49. xajax expanding list query
  50. What exactly does “Posts page” do in WordPress?
  51. Real time Duplicate title check
  52. Blank on static home page?
  53. WordPress automatically adds tags when pasting code, how to stop it?
  54. How to create and work with custom data / tables (i.e., for arbitrary data)?
  55. Trying to implement Ajax comments in WordPress, getting WP error
  56. Can’t search posts using WP_QUERY inside AJAX Function
  57. Woocommerce add to cart quantity buttons with AJAX
  58. Populate dropdown with Child Pages based on Parent Page chosen
  59. Ajax load more posts with multiple tax query
  60. Ajax call not working
  61. Plugins not working on AJAX requests
  62. How to convert select to HTML with PHP tags inside of it [closed]
  63. AJAX button action in foreach
  64. Add Codepen animation as Preloader to WordPress
  65. Ajax button not working
  66. Simple AJAX notification when the new post is added to the database
  67. register_setting & add_settings_error validation issues with multiple fields
  68. WordPress wp-admin redirect and exception
  69. Is it possible to create new user from external form using REST API?
  70. coding a WordPress AJAX Form using PHP to check if User is Logged Out and Show error
  71. When echo follow Ajax button inside Ajax pagination template not working?
  72. jQuery Ajax PHP function call returning [object Object]
  73. PHP Warning: Missing argument 2
  74. Make a page (url) not cacheable [closed]
  75. Disclaimer that will show every refresh of the page
  76. List sub categories and corresponding posts of a parent category
  77. population category dropdown and sub category onselect
  78. Failed to load resource: the server responded with a status of 500 (Internal Server Error) through wp_admin_ajax.php
  79. $_POST returning empty values
  80. Using Google Analytics in an enqueued JS file
  81. Ajax filter with loadmore button
  82. How do I disable cache for a certain page?
  83. $.ajax results in 403 forbidden
  84. How can I create a shortcode from an html and php code written together
  85. How can i get the same ajax result using WP REST API instead of admin-ajax?
  86. Allowing HTML elements in title widgets spacing problem
  87. html to posts, jpg to featured image, zip file contains jpg and html
  88. How do you change the tag font size in the repeater-template.php [closed]
  89. PHP tag in post content makes wordpress go crazy
  90. RegExp to EXCLUDE strip HTML (FOR SOMME) comments
  91. 403 (Forbidden) delete file image in themer folder
  92. Problems with plugin that fetches data from database with ajax
  93. How Can I Center the Logo in the Navigation Menu? [closed]
  94. Dynamic Gallery
  95. How to pass username into form that sends data to database
  96. Jquery autosave text area after typing
  97. Pass a PHP variable (loop-audio.php) to jQuery function (js/script.js)
  98. why is kses removing semicolon from inline style?
  99. Upload multiple files via ajax from an HTML file input
  100. How to pass javascript var to php var