How to Add Placeholder Text in Gravity Forms

/* 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>
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
}

Reference URL: http://www.wpbeginner.com/wp-tutorials/how-to-add-placeholder-text-in-gravity-forms/