Implementing birthday date linkage selection based on javascript bootstrap_javascript skills

The example in this article shares with you the relevant code for implementing date linkage selection in js, which is suitable for birthday selection for your reference. The specific content is as follows

Achieve the goal: three select input boxes for year, month and day, and a hidden input. Get the input value through js. If there is a value, it is in date format, and the year, month and day select is the time in the input. Otherwise empty. The default year range is from 1900 to the current year

I use bootstrap, please refer to the relevant instructions of bootstrap for class

The following is the html content:

<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>

The following is the js implementation:

//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");
    }
  }

The above is the entire content of this article, I hope it will be helpful to everyone’s study.