Hi Robin
I’m also looking for a function there can do this on custom field like url and rss feed

Maybe this function can be used http://wordpress.org/support/topic/179920 unfortunately, just do not know how do that

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yep…this is what i am looking for too…i try to code a solution.

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As a first step, you could create you’re own custom validation, see this topic.

The trick is then to get the code to test if that post title has already been submitted. Custom Fields are slightly different.

Take this code, put it in a php file with a unique name and upload it to your wp-content/plugins directory. It’ll create a new plugin. Once activated you’ll have a new widget called custom validation. Plonk it on the end of you’re form and voila, it wont’ allow a submission with a similar title to an existing submission (even one held in moderation).

<?php
/*
Plugin Name: My Custom Validation for TDO Mini Forms
Plugin URI: http://thedeadone.net/forum/?p=2814
Description: Blah
Version: 2
Author: Mark Cunningham
Author URI: http://thedeadone.net
*/

global $tdomf_widget_customvalidation;

function tdomf_init_widget_customvalidation() {
    if(class_exists('TDOMF_Widget')) {

      class TDOMF_WidgetCustomValidation extends TDOMF_Widget
      {
          function TDOMF_WidgetCustomValidation() {
              $this->enableValidate();
              // enableValidatePreview will enable validation on input on preview
              $this->enableValidatePreview();
              $this->setInternalName('customvalidation');
              $this->setDisplayName('My Custom Validation');
              $this->enableControl(false);
              $this->start();
          }

          function validate($args,$options,$preview) {
              global $wpdb;

              // $preview is a boolean indicating if this is being called
              // to validate a preview

              // $args are the inputs from the form
              extract($args);
              $output = '';

              // $content_title contains the inputted post title
              //
              $test_title = tdomf_protect_input($content_title);
              // we're going to use safe_name so as to avoid mismatches with
              // captials and spaces
              $test_title_safe = sanitize_title($test_title);

              // generate query
              //
              $query = "SELECT ID, post_title ";
              $query .= "FROM $wpdb->posts ";
              #$query .= "WHERE post_title = '$test_title' ";
              $query .= "WHERE post_name = '$test_title_safe' ";
              $query .= "ORDER BY ID DESC ";
              $results = $wpdb->get_results( $query );

              // process results (if any results we have a match)
              //
              if(!empty($results)) {
                 $output = "Sorry the title '$test_title' is very similar to an existing entry title!";
              }

              return $output;
          }
      }
    }
    $tdomf_widget_customvalidation = new TDOMF_WidgetCustomValidation();
}
add_action('plugins_loaded', 'tdomf_init_widget_customvalidation');

?>

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Hi Mark

How about Custom Fields, how do I do that?

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