Metacat

/****************************************************************************

* Multiple Assessment download

* @param form containing the neceassary input items

* @return true/false for form submission

*****************************************************************************/

function multipleAssessmentSearch(submitFormObj) {

	//harvest the metadata fields we want to include

	var metadataObjs = new Array();

	/*

	var index = 0;

	for (var i=0; i < submitFormObj.length; i++) {

		var formElement = submitFormObj.elements[i];

		if (formElement.type == "checkbox" && formElement.checked) {

			//ignore certain other checkboxes, kind of a hack 

			if (formElement.name == "includeQuestions") {

				continue;

			}

			var metadataObj = new Object();

			metadataObj.name = formElement.name;

			metadataObj.value = formElement.value;

			metadataObjs[index] = metadataObj;

			index++;

		}

	}

	*/

	//TODO option for all questions vs. just one

	var questionId = submitFormObj.questionId.value;

	//alert("questionId=" + questionId);

	var questionIds = new Array();

	questionIds[0] = questionId;

	var documentObjects = new Array();

	if (submitFormObj.docids.length > 1) {

		for (var i=0; i < submitFormObj.docids.length; i++) {

			var documentObject = new Object();

			documentObject.docid = submitFormObj.docids[i].value;

			documentObject.questionIds = questionIds;

			documentObjects[i] = documentObject;

		}

	}

	else {

		var documentObject = new Object();

		documentObject.docid = submitFormObj.docids.value;

		for (var z = 0; z < submitFormObj[documentObject.docid].length; z++) {

			questionIds[z] = submitFormObj[documentObject.docid][z].value;

		}

		documentObject.questionIds = questionIds;

		documentObjects[0] = documentObject;

	}

	var query = generateQuery(documentObjects, metadataObjs);

	submitFormObj.dataquery.value = query;

	return true;

}

/****************************************************************************

* Single Assessment download

* @param form containing the neceassary input items

* @return true/false for form submission

*****************************************************************************/

function assessmentSearch(submitFormObj) {

	//harvest the metadata fields we want to include

	var metadataObjs = new Array();

	var index = 0;

	for (var i=0; i < submitFormObj.length; i++) {

		var formElement = submitFormObj.elements[i];

		if (formElement.type == "checkbox" && formElement.checked) {

			//ignore certain other checkboxes, kind of a hack 

			if (formElement.name == "includeQuestions") {

				continue;

			}

			var metadataObj = new Object();

			metadataObj.name = formElement.name;

			metadataObj.value = formElement.value;

			metadataObjs[index] = metadataObj;

			index++;

		}

	}

	//var checkBox = document.getElementById("searchAll");

	var docId = submitFormObj.docid.value;

	//alert("docId=" + docId);

	//do we want question metadata?

	var includeQuestions = submitFormObj.includeQuestions.checked;

	var questionIds = new Array();

	questionIds[0] = "";

	if (includeQuestions) {

		if (submitFormObj.assessmentItemId.length > 1) {

			for (var i=0; i < submitFormObj.assessmentItemId.length; i++) {

				questionIds[i] = submitFormObj.assessmentItemId[i].value;

			}

		}

		else {

			questionIds[0] = submitFormObj.assessmentItemId.value;

		}

	}

	//set up the list of objects to pass to the query assembler, just one document

	var documentObjects = new Array();

	var documentObject = new Object();

	documentObject.docid = docId;

	documentObject.questionIds = questionIds;

	documentObjects[0] = documentObject;

	var query = generateQuery(documentObjects, metadataObjs);

	submitFormObj.dataquery.value = query;

	return true;

}

/****************************************************************************

* Query Generation function

* @param docObjs is an Array of Objects with "docid" (String) and "questionIds" (Array) properties

* @param metadataObjs is an Array of Objects with "name" and "value" properties (both String)

* @return generated query string

*****************************************************************************/

function generateQuery(docObjs, metadataObjs) {

	//alert("calling method");

	//construct the assessment metadata attribute selection snippet

	var metadataAttributes = "";

	var index = 0;

	for (var j=0; j < metadataObjs.length; j++) {

		var metadataObj = metadataObjs[j];

		metadataAttributes += "<attribute index=\"";

		metadataAttributes += index;

		metadataAttributes += "\">";

		metadataAttributes += "<pathexpr label=\"";

		metadataAttributes += metadataObj.name;

		metadataAttributes += "\">";

		metadataAttributes += metadataObj.value;

		metadataAttributes += "</pathexpr>";

		metadataAttributes += "</attribute>";

		index++;

	}//metadataObjs loop

	//construct the begining of the query

	var tempQuery = 

        "<?xml version=\"1.0\"?>"

        + "<dataquery>"

			+ "<union>";

	for (var i=0; i < docObjs.length; i++) {

		var docId = docObjs[i].docid;

		alert("docId=" + docId);

		//get the question ids for this question

		var questionIds = docObjs[i].questionIds;

		alert("questionIds=" + questionIds);

		//assemble the assessment metadata

		var metadataAttributeSelection = "";

		if (metadataAttributes.length > 0) {

			metadataAttributeSelection =

				"<datapackage id=\"" + docId + "\">"

					+ "<entity id=\"" + docId + "\">"

						+ metadataAttributes

					+ "</entity>"

				+ "</datapackage>";

		}

		//loop for each question item

		for (var k=0; k < questionIds.length; k++) {

			var questionId = questionIds[k];

			tempQuery +=

			"<query>"

			//select the data

			+ "<selection>"

				+ "<datapackage id=\"" + docId + "\">"

					+ "<entity index=\"0\">"

						+ "<attribute index=\"0\"/>"

						+ "<attribute index=\"1\"/>"

						//omit student id attribute

						+ "<attribute index=\"3\"/>"

						+ "<attribute index=\"4\"/>"

					+ "</entity>"

				+ "</datapackage>";

			//select the metadata

			tempQuery += metadataAttributeSelection;

			//select the question metadata						

			if (questionId.length > 0) {

				tempQuery +=

				"<datapackage id=\"" + questionId + "\">"

					+ "<entity id=\"" + questionId + "\">"

						+ "<attribute index=\"0\">"

							+ "<pathexpr label=\"qId\">//assessment/section/item/@ident</pathexpr>"

						+ "</attribute>"

						+ "<attribute index=\"1\">"

							+ "<pathexpr label=\"qTitle\">//assessment/section/item/@title</pathexpr>"

						+ "</attribute>"

						+ "<attribute index=\"2\">"

							+ "<pathexpr label=\"qLabel\">//assessment/section/item/presentation/@label</pathexpr>"

						+ "</attribute>"

					+ "</entity>"

				+ "</datapackage>";

			}

			tempQuery += "</selection>";

			//join to the quesion "table"

			if (questionId.length > 0) {

				tempQuery +=

					"<where>"

						+ "<condition type=\"join\">"

							+ "<left>"

								+ "<datapackage id=\"" + docId + "\">"

									+ "<entity index=\"0\">"

										+ "<attribute index=\"1\"/>"

									+ "</entity>"

								+ "</datapackage>"

							+ "</left>"

							+ "<operator>=</operator>"

							+ "<right>"

								+ "<datapackage id=\"" + questionId + "\">"

									+ "<entity id=\"" + questionId + "\">"

										+ "<attribute index=\"0\">"

											+ "<pathexpr label=\"qId\">//assessment/section/item/@ident</pathexpr>"

										+ "</attribute>"

									+ "</entity>"

								+ "</datapackage>"

							+ "</right>"

						+ "</condition>"

					+ "</where>";

			}

			tempQuery += "</query>";

		} // for questionId loop

	} //for docObjs loop

	tempQuery +=

		 "</union>"	

		 + "</dataquery>";

	alert(tempQuery);

    return tempQuery;

}