wpjb-custom-alerts-form.php

<?php

add_filter("wpjb_form_init_alert", "my_form_init_alert");
function my_form_init_alert($form) {

    $e = $form->create("frequency", "select");
    $e->addOption("1", "1", "Daily");
    $e->addOption("2", "2", "Weekly");
    $e->addClass("wpjb-widget-alert-frequency");
    $form->addElement($e, "alert");
    
    $e = $form->create("location");
    $e->setAttr("placeholder", "Location");
    $e->addClass("wpjb-widget-alert-param");
    $form->addElement($e, "alert");
    
    wp_enqueue_script("wpjb-vendor-selectlist");
    
    $e = $form->create("category", "select");
    $e->addOptions(wpjb_form_get_categories());
    $e->setEmptyOption(true);
    $e->setMaxChoices(10);
    $form->addElement($e, "alert");
    

    return $form;
}