function onCreateAutomaticGrouping() {
	valid =  validateAutomaticGroupingForm();
	if (valid) {
		hideAllForms();
		showElement("groupeditform");
		createAutomaticGrouping();
	}
	
	return false;
}


/**
 * Adds an automatically generated grouping with the details as specified in the form
 */
function createAutomaticGrouping() {
 	//alert("Called createAutomaticGrouping");	
 	var url = "createautomaticgrouping-xml.php";
    var requeststring = "noofstudents="+getTextInputValue('noofstudents')
    					+"&noofgroups="+getTextInputValue('noofgroups')
    					+"&distribevenly="+getCheckBoxValue('distribevenly')
    					+"&alphabetical="+getCheckBoxValue('alphabetical')
    					+"&generationtype="+getRadioValue(document.automaticgroupingform.generationtype)
    					+"&name="+getTextInputValue('automaticgroupingname')
    					+"&description="+getTextInputValue('edit-automaticgroupingdescription')
    					+"&prefix="+getTextInputValue('groupprefix')
    					+"&defaultgroupdescription="+getTextInputValue('edit-defaultgroupdescription');
   	
   	// alert(requeststring);
    sendPostRequest(request, url, requeststring, createAutomaticGroupingResponse);
 }
 


 /**
  * The callback for the response to the request sent in createAutomaticGrouping() 
  * It sets the new grouping to be selected in the form. 
  */
 function createAutomaticGroupingResponse() {
    if (checkAjaxResponse(request)) {
    	//alert("createAutomaticGroupingResponse");
      	//alert(request.responseText);
      	error = getFromXML(request.responseXML, 'error');
      	if (error != null) {
      		alert(error);	
      	}      	
      	selectedgroupingid = getFromXML(request.responseXML, 'groupingid');
      	selectedgroupid = null;
      	updateGroupings();
      	hideElement("createautomaticgroupingform");
    }
}

function validateAutomaticGroupingForm() {
	valid = true;
 	generationtype = getRadioValue(document.automaticgroupingform.generationtype);
 	noofstudents = getTextInputValue('noofstudents');
 	noofgroups = getTextInputValue('noofgroups');
 	groupingname = getTextInputValue('automaticgroupingname');
 	
 	if (generationtype == 'nostudents') {
 		if (!isPositiveInt(noofstudents)) {
 			alert('The number of students is not valid.');
 			valid = false;
 		} 
 	} else {		
 		if (!isPositiveInt(noofgroups)) {
 			alert('The number of groups is not valid.');
 			valid = false;
 		} 
 	}
 	
 	if (groupingname == '') {
 			alert('You must enter a name for the new grouping');
 			valid = false;
 	} 
 	
	return valid;
}