HTMLButtonField.php

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<?php

class HTMLButtonField extends HTMLFormField {
    protected $buttonType = 'button';

    public function __construct( $info ) {
        $info['nodata'] = true;
        parent::__construct( $info );
    }

    public function getInputHTML( $value ) {
        $attr = array(
            'class' => 'mw-htmlform-submit ' . $this->mClass,
            'id' => $this->mID,
        ) + $this->getAttributes( array( 'disabled', 'tabindex' ) );

        return Html::input( $this->mName, $value, $this->buttonType, $attr );
    }

    protected function needsLabel() {
        return false;
    }

    public function validate( $value, $alldata ) {
        return true;
    }
}