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html与django实现多级数据联动

1、流程

1、进入页面后先获取年级数据
2、选择年级后获取院级数据
3、选择院级后获取层次数据
4、选择层次数据后获取专业数据

2、html代码

<p style="margin-top: 10px;"><label>年级</label><select id="grade" class="form-control" required="required"name="grade"style="width: 100px; margin-left: 7px"><option id="name" value="">--请选择年级--</option></select></p><p style="margin-top: 10px;"><label>院级</label><select id="school" class="form-control" required="required"name="school"style="width: 100px; margin-left: 7px"><option id="name" value="">--请选择院级--</option></select></p><p style="margin-top: 10px;"><label>层次</label><select id="level" class="form-control" required="required"name="level"style="width: 100px; margin-left: 7px"><option id="name" value="">--请选择层次--</option></select></p><p style="margin-top: 10px;"><label>专业</label><select id="major" class="form-control" required="required"name="major"style="width: 100px; margin-left: 7px"><option id="name" value="">--请选择专业--</option></select></p>

js代码：

<script type="text/javascript">$(document).ready(function () {// 第一层 年级$.ajax({url: '{{ cascade_data }}',type: 'POST',data: {code: 'grade'},success: function (res) {var data = res['info'];for (var i = 0; i < data.length; i++) {$('#grade').append("<option value='" + data[i] + "'>" + data[i] + "</option>")}},error: function (err) {}});// 第二层 院级document.getElementById('grade').onchange = function () {$.ajax({url: '{{ cascade_data }}',type: 'POST',data: {code: 'school',grade_value: this.value,},success: function (res) {var data = res['info'];for (var i = 0; i < data.length; i++) {$('#school').append("<option value='" + data[i] + "'>" + data[i] + "</option>")}},error: function (err) {}});}// 第三层 层次document.getElementById('school').onchange = function () {$.ajax({url: '{{ cascade_data }}',type: 'POST',data: {code: 'level',grade_value: document.getElementById('grade').value,school_value: this.value,},success: function (res) {var data = res['info'];for (var i = 0; i < data.length; i++) {$('#level').append("<option value='" + data[i] + "'>" + data[i] + "</option>")}},error: function (err) {}});}// 第四层 专业document.getElementById('level').onchange = function () {$.ajax({url: '{{ cascade_data }}',type: 'POST',data: {code: 'major',grade_value: document.getElementById('grade').value,school_value: document.getElementById('school').value,level_value: this.value,},success: function (res) {var data = res['info'];for (var i = 0; i < data.length; i++) {$('#major').append("<option value='" + data[i] + "'>" + data[i] + "</option>")}},error: function (err) {}});}// 第五层document.getElementById('major').onchange = function () {$.ajax({url: '{{ cascade_data }}',type: 'POST',data: {code: 'other',grade_value: document.getElementById('grade').value,school_value: document.getElementById('school').value,level_value: document.getElementById('level').value,major_value: this.value,},success: function (res) {document.getElementById('price').value = res['price']document.getElementById('details').value = res['details']document.getElementById('remark').value = res['remark']},error: function (err) {}});}})
</script>

3、djanog代码

urls.py:

from django.urls import pathfrom textbook import viewsurlpatterns = [path("cascade_data/", views.cascade_data, name="cascade_data"),  # 教材级联数据
]

views.py代码：

def cascade_data(request, *args, **kwargs):# 获取级联数据code = request.POST.get('code', '')grade_value = request.POST.get('grade_value', '')school_value = request.POST.get('school_value', '')level_value = request.POST.get('level_value', '')major_value = request.POST.get('major_value', '')# 获取院级数据if code == 'grade':data = []for course in Course.objects.all().values('grade'):if course['grade'] not in data:data.append(course['grade'])return JsonResponse(data={'info': data})# 获取年级数据if code == 'school':data = []for course in Course.objects.filter(grade=grade_value).values('school'):if course['school'] not in data:data.append(course['school'])return JsonResponse(data={'info': data})# 获取层级数据if code == 'level':data = []for course in Course.objects.filter(grade=grade_value, school=school_value).values('level'):if course['level'] not in data:data.append(course['level'])return JsonResponse(data={'info': data})# 获取专业数据if code == 'major':data = []for course in Course.objects.filter(grade=grade_value, school=school_value, level=level_value).values('major'):data.append(course['major'])return JsonResponse(data={'info': data})# 获取其他数据if code == 'other':details = Noneprice = Noneremark = Nonefor course in Course.objects.filter(grade=grade_value, school=school_value, level=level_value,major=major_value):details = course.detailsprice = course.priceremark = course.remarkreturn JsonResponse(data={'details': details, 'price': price, 'remark': remark, })