js 联动实现日期选择，一般用作生日
Posted roychenyi
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实现目标：年月日三个select 输入框，以及一个hidden的input，通过js获取input的值，如果有值切是日期格式，年月日select为input中的时间。否则为空。年默认区间段为1900年到当今年份
本人使用了bootstrap，class请参照bootstrap的相关说明
下面是html 内容：
<div class="col-sm-9">
<label class="checkbox-inline">
<select node-type="birthday_year" name="birthday_y" id="birthday_y">
<option value=""></option>
</select><span>年</span>
</label>
<label class="checkbox-inline">
<select node-type="birthday_month" name="birthday_m" id="birthday_m">
<option value=""></option>
</select><span>月</span>
</label>
<label class="checkbox-inline">
<select node-type="birthday_month" name="birthday_d" id="birthday_d">
<option value=""></option>
</select><span>日</span>
</label>
<input type="hidden" name="birth" id="birth" value="2016/2/12">
<label class=‘checkbox-inline text-warning hidden‘ id="birth_error_info"><i class=‘fa fa-warning‘>请输入完整生日</i></label>
</div>
下面是js 的实现：
//设置生日的转换和获取
var date=new Date();
var year=date.getFullYear();
for(var i=year;i>=1900;i--){
$("#birthday_y").append("<option value="+i+" label="+i+">"+i+"</option>");
}
$(‘#birthday_y‘).change(function(){
var birth_year=$(‘#birthday_y‘).val();
if(birth_year!=""){
var birth_month=$(‘#birthday_m‘).val();
if(birth_month!=""){
if(birth_month=="2"){
if((birth_year%4==0 && birth_year%100!=0) || (birth_year%400==0)){
$("#birthday_d").append("<option value=" + 29 + " label=" + 29 + ">" + 29 + "</option>");
}else{
$("#birthday_d option[value=‘29‘]").remove();
}
}
}else {
for (var i = 1; i <= 12; i++) {
$("#birthday_m").append("<option value=" + i + " label=" + i + ">" + i + "</option>");
}
}
}else{
$("#birthday_m").html("<option value=‘‘></option>");
$("#birthday_d").html("<option value=‘‘></option>");
}
checkBirthday();
});
$(‘#birthday_m‘).change(function(){
var birth_year=$(‘#birthday_y‘).val();
var birth_month=this.value;
var birth_day=$(‘#birthday_d‘).val();
if(birth_month!=""){
switch (birth_month){
case "1":case "3":case "5":case "7":case "8":case "10":case "12":
if(birth_day=="") {
$("#birthday_d").empty();
$("#birthday_d").append("<option value=‘‘ ></option>");
for (var i = 1; i <= 31; i++) {
$("#birthday_d").append("<option value=" + i + " label=" + i + ">" + i + "</option>");
}
}else {
switch ($("#birthday_d option:last").attr("value")){
case "28":$("#birthday_d").append("<option value=" + 29 + " >" + 29 + "</option>");
case "29":$("#birthday_d").append("<option value=" + 30 + " >" + 30 + "</option>");
$("#birthday_d").append("<option value=" + 31 + " >" + 31 + "</option>");break;
case "30":$("#birthday_d").append("<option value=" + 31 + " >" + 31 + "</option>");
break;
default :break;
}
}
break;
case "4":case "6":case "9": case "11":
if(birth_day=="") {
$("#birthday_d").empty();
$("#birthday_d").append("<option value=‘‘ ></option>");
for (var i = 1; i <= 30; i++) {
$("#birthday_d").append("<option value=" + i + " label=" + i + ">" + i + "</option>");
}
}else{
switch ($("#birthday_d option:last").attr("value")){
case "28":$("#birthday_d").append("<option value=" + 29 + " >" + 29 + "</option>");
case "29":$("#birthday_d").append("<option value=" + 30 + " >" + 30 + "</option>");
case "31":$("#birthday_d option[value=‘31‘]").remove();
break;
default :break;
}
}
break;
case "2":
if(birth_day==""){
if((birth_year%4==0 && birth_year%100!=0) || (birth_year%400==0)){
for(var i=1;i<=29;i++){
$("#birthday_d").append("<option value="+i+" label="+i+">"+i+"</option>");
}
}else{
for(var i=1;i<=28;i++){
$("#birthday_d").append("<option value="+i+" label="+i+">"+i+"</option>");
}
}}else{
$("#birthday_d option[value=‘31‘]").remove();
$("#birthday_d option[value=‘30‘]").remove();
if((birth_year%4==0 && birth_year%100!=0) || (birth_year%400==0)){
}else{
$("#birthday_d option[value=‘29‘]").remove();
}
}
break;
default :break;
}
}
checkBirthday();
});
$(‘#birthday_d‘).change(function() {
checkBirthday();
}
);
$(‘#birthday_d‘).focus(
function(){
if($(‘#birthday_m‘).val()==""){
$("#birthday_d").empty();
$("#birthday_d").append("<option value=‘‘ ></option>");
}
}
);
//根据后台提供的数据，填充用户的值
var birth_value=$(‘#birth‘).val();
if(birth_value!="") {
var date1 = new Date(birth_value);
var b_year=date1.getFullYear();
var b_month=date1.getMonth()+1;
var b_day=date1.getDate();
$("#birthday_y").find("option[value=‘"+b_year+"‘]").attr("selected","selected");
if($(‘#birthday_y‘).val()!="") {
for (var i = 1; i <= 12; i++) {
$("#birthday_m").append("<option value=" + i + " label=" + i + ">" + i + "</option>");
}
}
$("#birthday_m").find("option[value=‘"+b_month+"‘]").attr("selected","selected");
switch (b_month){
case 1:case 3:case 5:case 7:case 8:case 10:case 12:
for (var i = 1; i <= 31; i++) {
$("#birthday_d").append("<option value=" + i + " label=" + i + ">" + i + "</option>");
}
break;
case 4:case 6:case 9: case 11:
$("#birthday_d").append("<option value=‘‘ ></option>");
for (var i = 1; i <= 30; i++) {
$("#birthday_d").append("<option value=" + i + " label=" + i + ">" + i + "</option>");
}
break;
case 2:
if((b_year%4==0 && b_year%100!=0) || (b_year%400==0)){
for(var i=1;i<=29;i++){
$("#birthday_d").append("<option value="+i+" label="+i+">"+i+"</option>");
}
}else{
for(var i=1;i<=28;i++){
$("#birthday_d").append("<option value="+i+" label="+i+">"+i+"</option>");
}
}
break;
default :break;
}
$("#birthday_d").find("option[value=‘"+b_day+"‘]").attr("selected","selected");
}
//验证生日是否输入完整
function checkBirthday(){
var b_year= $(‘#birthday_y‘).val();
var b_month=$(‘#birthday_m‘).val();
var b_day=$(‘#birthday_d‘).val();
if(b_year!=""&&b_month!=""&&b_day!=""){
$(‘#birth‘).val(b_year+"-"+b_month+"-"+b_day);
$(‘#birth_error_info‘).addClass("hidden");
}else{
$(‘#birth‘).val("");
$(‘#birth_error_info‘).removeClass("hidden");
}
}
仅供参考，欢迎批评指正！
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