Programmatically populate select drop down

[Brian Reeves]

I need to programmatically populate a select drop down field on an FES form. I don’t see a hook for doing that so I did it with javascript. That causes an error on submission telling me that the value is invalid. How can I properly populate the drop down options and values?

[Stephen Harris]

Hi Michael,

You can use the eventorganiser_get_fes_form – which is fired when ever the event form is instantiated. It allows you to modify the form object or its elements.

In the below I’ve assumed that you’ve got a select element with ID 9. Change that ID accordingly, or you can even create a new element at this point.

add_action( 'eventorganiser_get_fes_form', function( $form ) {

    $dropdown = $form->get_element( 9 );

    if ( ! $dropdown ) {
        return;
    }

    $dropdown->set( 'options', array(
        'foobar'      => 'Foobar',
        'hello-world' => 'Hello World',
    ) );

} );

[Brian Reeves]

Thanks. That helped a lot. Now I have an issue where I need it to be an associative array but I’m using a number (post id) as the value. I have to comment out the below in class-eo-event-form-element-view.php line 129 because it sees the integer and thinks it’s non associative.

    //if ( $is_associative ) {
        $select_options = $this->element->get( 'options' );
    //} else {
        // $select_options = array_combine( $this->element->get( 'options' ), $this->element->get( 'options' ) );
    //}

[Brian Reeves]

And that still doesn’t get it to work because it tells me that the value “is not a valid option” again.

[Stephen Harris]

Hi Brian,

There are associative checks in class-eo-event-form-element.php too. The associative checks are too lax here, as noted they are treating anything that has numerical only keys as non-associative. But that arrays such as:

array(
    1 => 'foobar',
    4 => 'hello world'
);

are actually associative (or at least, for the purposes of the form element).

I shall include this in the next update, but an immediate patch would be to replace the definition of $is_associative in the lines above the one you posted with:

is_array( $options )  && ( array_keys( $options ) !== range( 0, count( $options ) - 1) );

Then in class-eo-event-form-element.php there are three methods, is_associative(), the return statement should be:

return is_array( $options )  && ( array_keys( $options ) !== range( 0, count( $options ) - 1) );

[Brian Reeves]

Awesome! Thanks, that worked.

[Ali Zamanian]

Hey Stephen, how do I apply this only one form?

[Stephen Harris]

The passed EO_Event_Form instance has and id property: $form->id. Or you can use $form->get('name') to identify the form (this assumes you have given it a unique name).

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