"Dynamic Select Dropdown"
Bootstrap 4.0.0 Snippet by ottster

<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script> <script src="//code.jquery.com/jquery-1.11.1.min.js"></script> <!------ Include the above in your HEAD tag ----------> <div class="row"> <div class="col-md-6 mb-3"> <label for="validationCustom03">Category:</label> <select class="form-control form-control-lg" name="category" id="validationCustom03" onchange="ChangecatList()" required> <option value="">Choose... </option> <option value="Classroom Instruction and Assessment">Classroom Instruction and Assessment</option> <option value="Curriculum Development and Alignment">Curriculum Development and Alignment</option> <option value="District Committee">District Committee</option> <option value="Meeting">Meeting</option> <option value="Other Category">Other Category</option> <option value="Professional Conference">Professional Conference</option> <option value="Professional Workshop / Training">Professional Workshop / Training</option> <option value="Pupil Services">Pupil Services</option> </select> <div class="invalid-feedback"> Please provide a category. </div> </div> <div class="col-md-6 mb-3"> <label for="validationCustom04">Activity:</label> <select class="form-control form-control-lg" id="validationCustom04" name="activity" required></select> <div class="invalid-feedback"> Please provide an activity. </div> </div> </div>
var catAndActs = {}; catAndActs['Classroom Instruction and Assessment'] = ['Assessment Day', 'Common Assessment Development', 'Data Team', 'Kindergarten Screening', 'Other']; catAndActs['Curriculum Development and Alignment'] = ['Capstone Development', 'Course Of Study Development / Revision', 'Standards Alignment / Rollout', 'Other']; catAndActs['District Committee'] = ['Curriculum Council', 'Grading & Assessment Task Force', 'Professional Development Planning Committee', 'Race To The Top Committee', 'Teacher Evaluation Committee', 'Other']; catAndActs['Meeting'] = ['Academic Support Team', 'ELL / eKLIP Teachers', 'Gifted Intervention Specialist', 'Intervention Assistance Team', 'Intervention Teachers', 'Kindergarten Parent Conference', 'KLIP Teachers', 'Title I Teachers', 'Other']; catAndActs['Other Category'] = ['Other']; catAndActs['Professional Conference'] = ['Conference']; catAndActs['Professional Workshop / Training'] = ['In-District', 'Out-Of-District']; catAndActs['Pupil Services'] = ['IEP Meeting', 'IEP Writing']; function ChangecatList() { var catList = document.getElementById("validationCustom03"); var actList = document.getElementById("validationCustom04"); var selCat = catList.options[catList.selectedIndex].value; while (actList.options.length) { actList.remove(0); } var cats = catAndActs[selCat]; if (cats) { var i; for (i = 0; i < cats.length; i++) { var cat = new Option(cats[i], i); actList.options.add(cat); } } }

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