I am trying to save all of the options in a <select> element in a widget. So far I have the following PHP code for the form:
public function form( $instance ) { // Code for editing/adding title and adding IDs to the <select> object // ... <select class="widefat" id="<?php echo $this->get_field_id('ID_list'); ?>" name="<?php echo $this->get_field_name('ID_list'); ?>[]" multiple> <?php foreach( $instance['ID_list'] as $id ) { echo '<option value="' . $id . '">' . $id . '</option>' . "\n"; } ?> </select> } I also created a jQuery handler for the save button at the end of the form, which has the following code:
$('input#<?php echo $this->get_field_id('savewidget'); ?>').click( function( event ) { $('select#<?php echo $this->get_field_id('ID_list'); ?> option').prop('selected', true); }); I then use the following code for the update function of the widget:
public function update( $new_instance, $old_instance ) { // Update the title, etc... $instance['ID_list'] = isset( $new_instance['ID_list'] ) ? $new_instance['ID_list'] : array(); return $instance; } I was hoping that the $instance['ID_list'] would behave like the _POST('ID_list') would in a normal PHP form, and would be a sub-array containing all of the selected elements (in this case all the added IDs), however, this does not appear to happen; what is the idiomatic WordPress way of doing what I want to achieve?
Thanks in advance!
