C:/xampp/htdocs/moodle/lib/form/submit.php

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<?php
require_once("HTML/QuickForm/submit.php");

class MoodleQuickForm_submit extends HTML_QuickForm_submit {
    function MoodleQuickForm_submit($elementName=null, $value=null, $attributes=null) {
        parent::HTML_QuickForm_submit($elementName, $value, $attributes);
    }
    function onQuickFormEvent($event, $arg, &$caller)
    {
        switch ($event) {
            case 'createElement':
                parent::onQuickFormEvent($event, $arg, $caller);
                if ($caller->isNoSubmitButton($arg[0])){
                    //need this to bypass client validation
                    //for buttons that submit but do not process the
                    //whole form.
                    $onClick = $this->getAttribute('onclick');
                    $skip = 'skipClientValidation = true;';
                    $onClick = ($onClick !== null)?$skip.' '.$onClick:$skip;
                    $this->updateAttributes(array('onclick'=>$onClick));
                }
                return true;
                break;
        }
        return parent::onQuickFormEvent($event, $arg, $caller);

    } // end func onQuickFormEvent
    function getElementTemplateType(){
        if ($this->_flagFrozen){
            return 'nodisplay';
        } else {
            return 'default';
        }
    }

    function freeze(){
        $this->_flagFrozen = true;
    }

}