[Skip to main content](#vessel-content) # Developping a plugin that extend custom field Ajax File field. ## - **[oxido](/forum/user/29793-oxido "View oxido's Profile")** - [![oxido's Avatar](https://www.hikashop.com/media/kunena/core/svg/person.svg)](/forum/user/29793-oxido "View oxido's Profile") Topic Author - [ Offline](/forum/user/29793-oxido) Less More - Posts: 282 - Thank you received: 42 - - 8 years 7 months ago [\#289148](#289148) by [oxido](/forum/user/29793-oxido "View oxido's Profile") *[Developping a plugin that extend custom field Ajax File field.](/forum/31-development/894026-developping-a-plugin-that-extend-custom-field-ajax-file-field#289148 "-- HikaShop version -- : 3.3.0 -- Joomla version -- : 3.8.5 Guys, I ask you for guidance, please explain to me how can i extend and use class hikashopFieldAjaxfile in my own custom field plugin. I tried to understand how the datepicker plugin is working, but without much success. I want only to add some restriction to the files that can be uploaded through this custom field. Iknow that Hikashop has already implemented a restriction system for files, but i want to allow users to upload many types of files. But when a user sell an audio file, i want to allow him to upload 1 demo file that should be an mp3 file, or wav. I can not add these restrictions to Hikashop's main settings,because the users can also upload images. How can i use this: class plgHikashopMyclass extends hikashopFieldAjaxfile { } ? I want this field to be visible in frontend, cuz i'm using hikamarket. This is necessary in every plugin? ?")* was created by *[oxido](/forum/user/29793-oxido "View oxido's Profile")* -- HikaShop version -- : 3.3.0 -- Joomla version -- : 3.8.5 Guys, I ask you for guidance, please explain to me how can i extend and use class hikashopFieldAjaxfile in my own custom field plugin. I tried to understand how the datepicker plugin is working, but without much success. I want only to add some restriction to the files that can be uploaded through this custom field. Iknow that Hikashop has already implemented a restriction system for files, but i want to allow users to upload many types of files. But when a user sell an audio file, i want to allow him to upload 1 demo file that should be an mp3 file, or wav. I can not add these restrictions to Hikashop's main settings,because the users can also upload images. How can i use this: class plgHikashopMyclass extends hikashopFieldAjaxfile { } ? I want this field to be visible in frontend, cuz i'm using hikamarket. This is necessary in every plugin? Code: function plgHikashopName(&$subject, $config){ parent::__construct($subject, $config); } ? Please [Log in](/login?return=aHR0cHM6Ly93d3cuaGlrYXNob3AuY29tL2ZvcnVtL2RldmVsb3BtZW50Lzg5NDAyNi1kZXZlbG9wcGluZy1hLXBsdWdpbi10aGF0LWV4dGVuZC1jdXN0b20tZmllbGQtYWpheC1maWxlLWZpZWxkP3RtcGw9bWFya2Rvd24=) or [Create an account](/component/users/registration?Itemid=101) to join the conversation. - **[Jerome](/forum/user/80-jerome "View Jerome's Profile")** - [![Jerome's Avatar](https://www.hikashop.com/media/kunena/avatars/resized/size144/users/avatar80.png)](/forum/user/80-jerome "View Jerome's Profile") - [ Offline](/forum/user/80-jerome) - HikaShop core developer Less More - Posts: 26394 - Thank you received: 4078 - - [](http://obsi.dev) - 8 years 7 months ago [\#289149](#289149) by [Jerome](/forum/user/80-jerome "View Jerome's Profile") Replied by *[Jerome](/forum/user/80-jerome "View Jerome's Profile")* on topic *[Developping a plugin that extend custom field Ajax File field.](/forum/31-development/894026-developping-a-plugin-that-extend-custom-field-ajax-file-field#289149 "-- HikaShop version -- : 3.3.0 -- Joomla version -- : 3.8.5 Guys, I ask you for guidance, please explain to me how can i extend and use class hikashopFieldAjaxfile in my own custom field plugin. I tried to understand how the datepicker plugin is working, but without much success. I want only to add some restriction to the files that can be uploaded through this custom field. Iknow that Hikashop has already implemented a restriction system for files, but i want to allow users to upload many types of files. But when a user sell an audio file, i want to allow him to upload 1 demo file that should be an mp3 file, or wav. I can not add these restrictions to Hikashop's main settings,because the users can also upload images. How can i use this: class plgHikashopMyclass extends hikashopFieldAjaxfile { } ? I want this field to be visible in frontend, cuz i'm using hikamarket. This is necessary in every plugin? ?")* Hello, 1 - No you don't need to declare an override function if you don't want to override that function. 2 - We don't use constructors based on the class name for a very long time ; it's deprecated in PHP 5 and even refused by PHP 7 ! 3 - If you do not have the required PHP skills ; we would recommend you to contact someone to help you. 4 - Feel free to submit a feature request if you have an idea which can be interesting for the all community. 5 - But if you need that new feature to be implemented into the HikaShop core class in a short delay ; it might be faster to contact some of the HikaShop partners. Regards, --- Jerome - Obsidev.com HikaMarket & HikaSerial developer / HikaShop core dev team. Please [Log in](/login?return=aHR0cHM6Ly93d3cuaGlrYXNob3AuY29tL2ZvcnVtL2RldmVsb3BtZW50Lzg5NDAyNi1kZXZlbG9wcGluZy1hLXBsdWdpbi10aGF0LWV4dGVuZC1jdXN0b20tZmllbGQtYWpheC1maWxlLWZpZWxkP3RtcGw9bWFya2Rvd24=) or [Create an account](/component/users/registration?Itemid=101) to join the conversation. 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