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<?php
	/* Add a custom field to the field editor (See editor screenshot) */
	add_action("gform_field_standard_settings", "my_standard_settings", 10, 2);

	function my_standard_settings($position, $form_id)
	{

		// Create settings on position 25 (right after Field Label)

		if($position == 25)
		{
		?>	
			<li class="admin_label_setting field_setting" style="display: list-item; ">
			<label for="field_placeholder">Placeholder Text

			<!-- Tooltip to help users understand what this field does -->
			<a href="javascript:void(0);" class="tooltip tooltip_form_field_placeholder" tooltip="&lt;h6&gt;Placeholder&lt;/h6&gt;Enter the placeholder/default text for this field.">(?)</a>
						
			</label>
					
			<input type="text" id="field_placeholder" class="fieldwidth-3" size="35" onkeyup="SetFieldProperty('placeholder', this.value);">
					
			</li>
		<?php
		}
	}

	/* Now we execute some javascript technicalitites for the field to load correctly */

	add_action("gform_editor_js", "my_gform_editor_js");

	function my_gform_editor_js()
	{
	?>
		<script>
			//binding to the load field settings event to initialize the checkbox
			jQuery(document).bind("gform_load_field_settings", function(event, field, form){
			jQuery("#field_placeholder").val(field["placeholder"]);
			});
		</script>

	<?php
	}

	/* We use jQuery to read the placeholder value and inject it to its field */

	add_action('gform_enqueue_scripts',"my_gform_enqueue_scripts", 10, 2);

	function my_gform_enqueue_scripts($form, $is_ajax=false)
	{
	?>
		<script>

		jQuery(function() {
		<?php

		/* Go through each one of the form fields */

		foreach($form['fields'] as $i=>$field) {

			/* Check if the field has an assigned placeholder */
						
			if(isset($field['placeholder']) && !empty($field['placeholder']))
			{
							
				/* If a placeholder text exists, inject it as a new property to the field using jQuery */
							
				?>
						
				jQuery('#input_<?php echo $form['id']?>_<?php echo $field['id']?>').attr('placeholder','<?php echo $field['placeholder']?>');
					
			<?php
			}
		}
		?>
		});

		</script>
	<?php
	}
?>