WP Libre Form

Use standard HTML5 markup to create fully functional forms for WordPress

Features:

Uses only HTML5 syntax to build forms. No GUIs, shortcodes, no bullshit
Works with any valid HTML form. Just copy any form from any website and it will work. It's magic!
Submits and validates forms via AJAX
Automatically detects and captures fields in any HTML form. Form values are saved as standard custom fields
Validates required fields automatically using the native HTML5 required attribute
It's pluggable. Add your own validation or automation with filters and action hooks.
Option to send a copy of submitted forms via email
Preview your forms
Full file upload support with input type=file

Screenshots

Editing a Form

Form displayed in the default Twentysixteen theme

Submissions view

Single submission view

Installation

The Composer Way (preferred)

Install the plugin via Composer

composer require anttiviljami/wp-libre-form

Activate the plugin

wp plugin activate wp-libre-form

The Old Fashioned Way

This plugin is available on the official WordPress.org plugin directory.

You can also install the plugin by directly uploading the zip file as instructed below:

Download the plugin
Upload to the plugin to /wp-content/plugins/ via the WordPress plugin uploader or your preferred method
Activate the plugin

Filter / Action API

Action: wplf_post_validate_submission

Triggers after the form validation is done.

Example use:

Send a thank you email to the email in the submission

<?php
add_action( 'wplf_post_validate_submission', 'my_email_thankyou' );
function my_email_thankyou( $return ) {
  // do nothing if form validation failed
  if( ! $return->ok ) {
    return;
  }

  $name = sanitize_text_field( $_POST['name'] );
  $email = sanitize_email( $_POST['email'] );
  $to = '"' . $name . '" <' . $email . '>';
  $subject = __( 'Thank You For Submitting A Form' );
  $content = wp_sprintf( __('Thanks, %s for clicking Submit on this glorious HTML5 Form!'), $name );
  wp_mail( $to, $subject, $content );
}

Use shortcodes outside post content

By default, scripts are only loaded when the shortcode is within the content. If you use shortcodes outside the content, ex. custom fields or by do_shortcode, you need to manually enqueue the scripts for the submit to work.

wp_enqueue_script('wplf-form-js');
wp_localize_script( 'wplf-form-js', 'ajax_object', array( 'ajax_url' => admin_url( 'admin-ajax.php' ) ) );

Client side callbacks

WP Libre Form supports client side callbacks after form submission using window.wplf object. Example usage:

window.wplf.successCallbacks.push(function(response){
  alert("You succesfully submitted form " + response.form_id);
});

window.wplf.errorCallbacks.push(function(response){
  alert("Form submission failed!");
});

These callbacks are executed in the order they appear.

Add CSS classes to form output

You can use the xclass attribute inside the shortcode to add your own extra classes.

[libre-form id="1" xclass="extra"]

Filter: wplf_validate_submission

Used to add validation to your forms

Example use:

Make sure people don't include dumb questions about Contact Form 7 in the message field.

<?php
add_filter( 'wplf_validate_submission', 'my_form_validation' );
function my_form_validation( $return ) {
  // skip this validation if submission has already failed
  if( ! $return->ok ) {
    return $return;
  }

  // don't allow contact form 7 to be mentioned in the message field
  if( false !== strpos( strtolower( $_POST['message'] ), 'contact form 7' ) ) {
    $return->ok = 0;
    $return->error = sprintf( __("I don't like Contact Form 7 so I won't accept your submission."), intval( $_POST['_form_id'] ) );
  }
  return $return;
}

wplf_validate_submission example: Google ReCaptcha integration

/**
 * ReCaptcha for WP Libre Form
 */
add_filter( 'wplf_validate_submission', 'wplf_recaptcha' );
function wplf_recaptcha( $return ) {
  // skip this validation if submission has already failed
  if( ! $return->ok ) {
    return $return;
  }

  $form = get_post( (int) $_POST['_form_id'] );
  if( false === strpos( $form->post_content, 'g-recaptcha' ) ) {
    // this form doesn't have recaptcha
    return $return;
  }

  $secret = 'XXXX'; // substitute with your own secret recaptcha key

  $options = [
    'http' => [
      'header'  => "Content-type: application/x-www-form-urlencoded\r\n",
      'method'  => 'POST',
      'content' => http_build_query([
        'secret' => $secret,
        'response' => $_POST['g-recaptcha-response'],
      ])
    ],
  ];
  $context  = stream_context_create( $options );
  $result = file_get_contents( 'https://www.google.com/recaptcha/api/siteverify', false, $context );

  $captcha_obj = json_decode( $result );

  if( false === $captcha_obj->success ) {
    $return->ok = 0;
    $return->error = sprintf( __("Please prove you're not a robot before submitting."), intval( $_POST['_form_id'] ) );
  }

  return $return;
}

Multilingual

You can create multilingual forms using Polylang. WPLF will register and automatically fetch the translation when you use special template tags.

Example:

<input type="text" placeholder="{{ Test string  }}" name="test">

You can also disable this feature, and create your own middleware for WPML, if you'd like.

add_filter( 'wplf_load_polylang' , function() {
  return false;
} );

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wp-libre-form's Introduction