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POhow to create a wordpress plugin that adds additional input fields to the Write/Edit page
 

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  1. POhow to create a wordpress plugin that adds additional input fields to the Write/Edit page
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    <p>I am writing a plugin that requires additional information from the use when they create a post. I need a text box that they will enter a number that can have decimals and a drop down box that will give a few options. I also need this data to be saved with the rest of the post data in the wordpress DB. Can someone give me some help with this?</p> <p>P.S. i will later need to add an area to the post itself when displayed that shows a piece of data calculated from the plugin but first things first. </p> <p>EDIT: i got the first part done but now i can't get the new fields to save data with the post, here is my code.</p> <pre><code>&lt;?php /* Plugin Name: Column Height Calculator Plugin URI: # Description: calculates the height of the column Version: 0.1 Author: Ben Crawford Author URI: */ add_action('admin_menu', 'my_post_options_box'); function my_post_options_box() { add_meta_box('post_info', 'Column Height Info', 'custom_post_info', 'post', 'side', 'high'); } //Adds the actual option box function custom_post_info() { global $post; ?&gt; &lt;fieldset id="mycustom-div"&gt; &lt;div&gt; &lt;p&gt; &lt;label for="column_type" &gt;Column Type:&lt;/label&gt; &lt;br /&gt; &lt;select name="column_type" id="column_type"&gt; &lt;option value="JBC"&gt;Justified Body Copy&lt;/option&gt; &lt;option value="LRC"&gt;Left Raggid Copy&lt;/option&gt; &lt;/select&gt; &lt;br /&gt; &lt;br /&gt; &lt;label for="header_size"&gt;Header Size:&lt;/label&gt; &lt;br /&gt; &lt;input type="text" name="header_size" id="header_size" value="&lt;?php echo get_post_meta($post-&gt;ID, 'header_size', true); ?&gt;"&gt; &lt;/p&gt; &lt;/div&gt; &lt;/fieldset&gt; &lt;?php } add_action('save_post', 'custom_add_save'); function custom_add_save($postID){ // called after a post or page is saved if($parent_id = wp_is_post_revision($postID)) { $postID = $parent_id; } if ($_POST['column_type']) { update_custom_meta($postID, $_POST['column_type'], 'column_type'); } if ($_POST['header_size']) { update_custom_meta($postID, $_POST['header_size'], 'header_size'); } } function update_custom_meta($postID, $newvalue, $field_name) { // To create new meta if(!get_post_meta($postID, $field_name)){ add_post_meta($postID, $field_name, $newvalue); }else{ // or to update existing meta update_post_meta($postID, $field_name, $newvalue); } } ?&gt; </code></pre>
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    1. COIndenting the code properly makes it *thousands of times easier to read and debug*. You can find many examples of working code in [wordpress.se], check [this search query](http://wordpress.stackexchange.com/search?tab=votes&q=%2badd_meta_box%20%2bsave_post%20is%3aanswer).
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      1. POhow to create a wordpress plugin that adds additional input fields to the Write/Edit page
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