Hello,

I'm struggling to modify a plugin that adds an alternative price field to the item-post / item-edit pages.
In it's current form, the plugin always shows the field regardless of the category selected, but I want to change it to be category-dependant.

By looking at the plugin dev structure here, I've managed to hook the plugin to categories (t_plugin_category table), but I can't make the field show/hide based on the category selection...

Here is the plugin code that handles the field:
function osc_set_mrp_number() {
    $detail = '';
    if (osc_is_publish_page()) {
        if (Session::newInstance()->_getForm('mrp') != '') {
            $detail = Session::newInstance()->_getForm('mrp');
        }
    } else if (osc_is_edit_page()) {
        if (Session::newInstance()->_getForm('mrp') != '') {
            $detail = Session::newInstance()->_getForm('mrp');
        } else {
            $value = Modeldiscount::newInstance()->t_check_value(osc_item_id());
            if (!empty($value)) {
                $detail = $value['s_mrp'];
            }
        }
    }
    ?>
    <div class="form-group js-price">
        <label class="col-sm-3 control-label" for="price"><?php _e('Market Price', 'mrp'); ?></label>
        <div class="col-sm-3">
            <input id="mrp" type="text" value="<?php echo osc_esc_html($detail); ?>" name="mrp"></input>
        </div>
        <div class="col-sm-3">
            <?php ItemForm::currency_select(); ?>
        </div>
    </div>
    <?php
}

function pre_post_store_value() {
    Session::newInstance()->_setForm('mrp', Params::getParam("mrp"));
    Session::newInstance()->_keepForm('mrp');
}

osc_add_hook('pre_item_post', 'pre_post_store_value');

The plugin's slug is mrp_price, so I tried to add a category check, but this hides the field completely and doesn't show it when selecting the correct category:
if (osc_is_this_category('mrp_price', osc_item_category_id())) {
    if ( Session::newInstance()->_getForm('mrp') != '' ) {
        $detail['mrp'] = Session::newInstance()->_getForm('mrp');
    }
}
What else could I try, as this is driving me crazy?

Thanks!

Do you show that field via item_form hook?

I'm showing it in forms, using this function:
<?php if(function_exists('osc_set_mrp_number')) { osc_set_mrp_number(); } ?>

@Tango
But if it is not loaded via hooks, then if you change category, nothing will happen, as only hooked functions will get refreshed.

Yeah, found a hackier but better way to do it.

I've attached my plugin to the Osclass Pay, with:
if(function_exists('osp_item_sell_form')) {
  $sellers = explode(',', osp_param('seller_users'));
  if(function_exists('osc_set_mrp_number') && osp_param('selling_allow') == 1 && in_array(osc_logged_user_id(), $sellers) && osc_is_web_user_logged_in()) {
     osc_set_mrp_number();
  }
}
So my field will show only to Sellers!

Thanks for the support!