View source for Creating a custom form field type

== Which Class to Subclass? == <!--T:65-->
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For a form field type to be usable in JForm, it needs to be a subclass of JFormField. However, it does not have to be a direct child of that class. You can also subclass an existing (standard or custom) form field type and thereby inherit useful code.
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If your form field type is similar to an existing type, you '''should''' subclass that type. Especially if your form field type is a ''list'', please subclass [https://api.joomla.org/cms-3/classes/JFormFieldList.html JFormFieldList]. You only have to override ''getOptions()'' method to return the options to be shown. The ''getInput()'' method will convert those options to HTML.
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To subclass an existing type, for example JFormFieldList, load it by adding the following after ''jimport('joomla.form.formfield');'':</translate>

<syntaxhighlight lang="php">
jimport('joomla.form.helper');
JFormHelper::loadFieldClass('list');
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If your form field type is unlike any existing type, subclass ''JFormField'' directly.</translate>

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