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POPassing selected value of a listbox to another listbox in google-apps-script
 

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  1. POPassing selected value of a listbox to another listbox in google-apps-script
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    <p>I am building a google apps UI and I am having trouble determining the value of an item in one listbox from the call back event in a separate listbox. I tried passing hidden events but this did not work out. How do I pass the selected grade to _clickCourse</p> <p>This is a rough description of the code in english:</p> <p>1) Populate the first listbox with all available unique grades 2) Attach a function to be triggered when the content of the grade listbox changes 3) In the function created in 2, I know the selected grade via the even, use that info to filter on the correct courses, populate the course listbox with the valid courses. 4) Attach a callback function to the courses listbox 5) Inside this function, filter on the selected grade + selected course to determine the valid semesters.</p> <p>... The issue is that the last Function knows the selected course via the event that google UI passed to it, but it does not know the selected grade. </p> <pre><code>Sample Data: Grade Semester Course Unit 1 1 Chemistry101 Chemistry 3 2 Physics321 Physics 2 1 Chemistry101 Chemistry function executionStartsHere() { var doc = SpreadsheetApp.getActiveSpreadsheet(); var app = UiApp.createApplication().setTitle('Course Planner'); var panel = app.createVerticalPanel(); panel.setId("main-panel"); //grades panel.add(_getLabel("Grades")); uniqueGrades = _findUniqueGrades(); gradeListBox = _getListBox(app,uniqueGrades,"grade-listbox","grades"); var gradeHandler = app.createServerHandler('_clickGrade'); gradeListBox.addChangeHandler(gradeHandler); panel.add(gradeListBox); //courses panel.add(_getLabel("Courses")); courseListBox = _getListBox(app,{},"course-listbox","courses"); var courseHandler = app.createServerHandler('_clickCourse'); courseListBox.addChangeHandler(courseHandler); panel.add(courseListBox); //semester panel.add(_getLabel("Semester")); semesterListBox = _getListBox(app,{},"semester-listbox","semesters"); panel.add(semesterListBox); h = app.createHidden("selectedGrade").setId("selectedGrade"); h.setValue("1"); panel.add(h); //finally app.add(panel); doc.show(app); } function _clickGrade(eventInfo) { var app = UiApp.getActiveApplication(); // get value of ListBox based on name var selectedGrade = eventInfo.parameter.grades; Logger.log("In clickGrade, selected:"+selectedGrade); //eventInfo.parameter.selectedGrade=selectedGrade; app.getElementById("selectedGrade").setValue(selectedGrade); Logger.log("eventInfo.parameter.selectedGrade: "+eventInfo.parameter.selectedGrade); _displayCourses(selectedGrade); return app; } function _clickCourse(eventInfo) { //WE NEED TO SOMEHOW PASS THE SELCTED GRADE IN HERE var app = UiApp.getActiveApplication(); var grade = app.getElementById("selectedGrade") var grade2 = eventInfo.parameter.selectedGrade; var course = eventInfo.parameter.courses; Logger.log("Selected grade, grade2, course: "+grade+" ,"+grade2+" ,"+course); _displaySemesters(grade,course); return app; } function _displayCourses(grade) { var app = UiApp.getActiveApplication(); validCourses = _findValidCourses(grade); lb = app.getElementById("course-listbox"); _populateListBox(lb,validCourses); } function _displaySemesters(grade,course){ var app = UiApp.getActiveApplication(); validSemesters = _findValidSemesters(grade,course); lb = app.getElementById("semester-listbox"); _populateListBox(lb,validSemesters); } function _findUniqueGrades(){ var workBook = _getWorkBook(); var sheet = _getLearningOutcomeSheet(workBook); var graderows = getColumnAsArray(sheet, 1); var grades= {}; for(var i=1; i&lt;graderows.length; i++) { //skip the first row (labels) if(graderows[i] != "" &amp;&amp; graderows[i] != undefined ) { grades[graderows[i]]=graderows[i]; } } return grades; } function _findValidCourses(grade) { var workBook = _getWorkBook(); var sheet = _getLearningOutcomeSheet(workBook); var graderows = getColumnAsArray(sheet, 1); var courserows = getColumnAsArray(sheet, 3); // loop over courserows // if the grade for this courserow matches the grade we are searching for // then store this courserow in an associative array validCourses = {}; for(var i=0; i&lt; courserows.length; i++) { if ( graderows[i] == grade ) { validCourses[courserows[i]] = courserows[i]; } } return validCourses; } function _findValidSemesters(grade,course){ var workBook = _getWorkBook(); var sheet = _getLearningOutcomeSheet(workBook); var graderows = getColumnAsArray(sheet, 1); var courserows = getColumnAsArray(sheet, 3); var semesterrows = getColumnAsArray(sheet, 2); validSemesters = {}; for(var i=0; i&lt; semesterrows.length; i++){ if ( courserows[i] == course &amp;&amp; graderows[i] == grade ){ validSemesters[semesterrows[i]] = semesterrows[i]; } } return validSemesters; } function _getListBox(app,items,id,label){ var lb = app.createListBox().setId(id).setName(label); lb.setVisibleItemCount(1); //add items, if any for each ( i in items) { lb.addItem(i); } return lb; } function _populateListBox(listBox,items){ listBox.clear(); Logger.log("ListBox ID: "+ listBox.getId()); for each ( i in items) { Logger.log("adding item: " + i); listBox.addItem(i); } } function _getWorkBook(){ return SpreadsheetApp.openById(employee_SPREADSHEET); } function _getLearningOutcomeSheet(workBook){ return workBook.getSheets()[0]; } function _getLabel(string){ var app = UiApp.getActiveApplication(); return app.createLabel(string); } function getColumnAsArray(sheet,column) { var dataRange = sheet.getRange(1,column,99,1); var data = dataRange.getValues() //Logger.log("column values: " + data); return data; } </code></pre>
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