我已经从mysql表中提取了数据，现在解码json_decode我们有用于board、class、subject的json数组，它们之间的关系类似于parent->child->grandschild（board->class->subject）board_auto_id是classList json数组的第一个class_auto_id是classSubjectList 的第一个索引
注意：我已经发布了classList和classSubjectList 的部分数组
var boardList =[{"board_auto_id":"1","board_name":"CBSE"},{"board_auto_id":"2","board_name":"ICSE"},{"board_auto_id":"3","board_name":"NCERT"}];
var classList = {"1":[{"class_auto_id":"1","class_name":"VI"},{"class_auto_id":"2","class_name":"VII"},{"class_auto_id":"3","class_name":"VIII"},{"class_auto_id":"4","class_name":"IX"},{"class_auto_id":"5","class_name":"X"},{"class_auto_id":"6","class_name":"XI"},{"class_auto_id":"7","class_name":"XII"}]};
var classSubjectList = {"1":[{"class_auto_id":"1","sub_auto_id":"1","subject_name":"Science"},{"class_auto_id":"1","sub_auto_id":"2","subject_name":"Mathematics"},{"class_auto_id":"1","sub_auto_id":"3","subject_name":"Geography : The Earth Our Habitat "},{"class_auto_id":"1","sub_auto_id":"4","subject_name":"History : Our Pasts - I"},{"class_auto_id":"1","sub_auto_id":"5","subject_name":"Civics : Social And Political Life-I"},{"class_auto_id":"1","sub_auto_id":"86","subject_name":"English : Grammar"},{"class_auto_id":"1","sub_auto_id":"139","subject_name":"English : Writing Skills"},{"class_auto_id":"1","sub_auto_id":"155","subject_name":"English : Reading"},{"class_auto_id":"1","sub_auto_id":"209","subject_name":"संस्कृत : व्याकरण"},{"class_auto_id":"1","sub_auto_id":"220","subject_name":"Computer Science"},{"class_auto_id":"1","sub_auto_id":"235","subject_name":"Literature in English ( NCERT)"},{"class_auto_id":"1","sub_auto_id":"238","subject_name":"हिंदी व्याकरण"},{"class_auto_id":"1","sub_auto_id":"253","subject_name":"English : Vocabulary"}],"2":[{"class_auto_id":"2","sub_auto_id":"6","subject_name":"Science"},{"class_auto_id":"2","sub_auto_id":"7","subject_name":"Mathematics"},{"class_auto_id":"2","sub_auto_id":"8","subject_name":"Geography : Our Environment"},{"class_auto_id":"2","sub_auto_id":"9","subject_name":"History : Our Pasts - II"},{"class_auto_id":"2","sub_auto_id":"10","subject_name":"Civics : Social And Political Life - II"},{"class_auto_id":"2","sub_auto_id":"87","subject_name":"English : Grammar"},{"class_auto_id":"2","sub_auto_id":"140","subject_name":"English : Writing Skills"},{"class_auto_id":"2","sub_auto_id":"154","subject_name":"English : Reading"},{"class_auto_id":"2","sub_auto_id":"210","subject_name":"संस्कृत : व्याकरण"},{"class_auto_id":"2","sub_auto_id":"213","subject_name":"Computer Science"}]}
HTML代码
<select name="boardId" id="boardId" class="style1"><option value="">Select Board</option></select>
<select name="classId" id="classId" class="style1"><option value="">Select Class</option></select>
<select name="subjectId" id="subjectId" class="style1"><option value="">Select Subject</option></select>
您可以这样做，将json绑定到下拉
<select id="boardList"></select>
$.each(boardList, function (key, value) {
console.log(value.board_auto_id);
appenddata += "<option value = '" + value.board_auto_id + " '>" + value.board_name + " </option>";
});
$('#boardList').html(appenddata);
boardList下拉列表中的OnChange，您需要从另一个jsonArray中筛选记录，并将其绑定到下一个dropdown，与上面代码中提到的相同。
使用的第一块显示板
jQuery.each(boardList, function(i , item) {
selectedBoard='';// if you display no board selected
boardListHtml += '<option '+ selectedBoard +' value="'+item.board_auto_id+'">'+item.board_name+'</option>';
});
jQuery('#boardId').html(boardListHtml);
为每次调用创建类和主题的函数
function getBoardByClass(boardId){
jQuery('#classId').html('');
var classChapterListHtml = '<option value="">Select Class</option>';
jQuery.each(classList, function(i , item) {
var selectedClass = (boardId ==item.class_auto_id) ? 'selected' : '';
classChapterListHtml += '<option '+ selectedClass +' value="'+item.class_auto_id+'">'+item.class_name+'</option>';
});
jQuery('#classId').html(classChapterListHtml);
}
function getSubjectByClass(classID){
jQuery('#subjectId').html('');
var subjectListHtml = '<option value="">Select Subject</option>';
jQuery.each(classSubjectList, function(id , subjectList) {
if (classID==id) {
jQuery.each(subjectList, function(subIds , subjectName) {
subjectListHtml += '<option value="'+subjectName.sub_auto_id+'">'+subjectName.subject_name+'</option>';
});
}
});
jQuery('#subjectId').html(subjectListHtml);
}
最后更改类别和主题过滤器的事件
$("#boardId").change(function() {
jQuery('#classId').html('');
getBoardByClass($(this).val());
});
$("#classId").change(function() {
jQuery('#subjectId').html('');
getSubjectByClass($(this).val());
});