Making a calendar control using pure javascript_javascript skills-JS Tutorial-php.cn

In the past, when I wanted to use the calendar control, I had to download a set of source code directly from the Internet. I always had an idea in my mind that I wanted to write a calendar control myself. Recently, I just got interested and time allowed, so I explored it myself. I wrote one, the function is quite complete, and the interface is just okay. Perhaps the most noteworthy point is to display a button on the right side of the input control. I directly added a background to the input and then removed the border of the input.
This is the first version, and I plan to make a pure JavaScript version in the future, and I plan to use JQuery to make one in the future.
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>日历控件</title>
<style>
#date_text {
  background-image: url(images/input.png);
  background-repeat:no-repeat;
  width: 198px;
  height: 27px;
  border:none;
  padding-left:5px;
  cursor:pointer;
}

#cal_body {
  width: 198px;
  height: auto;
  overflow:hidden;
  border: solid 1px #CCCCCC;
  display: none;
  position:absolute;
  z-index:10;
}

.line {
  width:100%;
  height:26px;
  float:left;
  background-color:#0FF;
  font-size:14px;
}

.cube {
  float:left;
  width:26px;
  height:26px;
  line-height:26px;
  text-align:center;
  margin-left:2px;
  margin-bottom:2px;
}

.btn {
  float:left;
  background-color:#CCC;
  margin-left:10px;
  width:20px;
  height:20px;
  text-align:center;
  line-height:20px;
  border-radius:3px;
  border:solid 1px;
  margin-top:2px;
  cursor:pointer;
}

.year_month {
  float:left;
  margin-left:10px;
  width:90px;
  height:19px;
  text-align:center;
  line-height:19px;
  border-radius:6px;
}

.end_tag {
  height:26px;
  line-height:26px;
  margin-left:10px;
}
</style>
<script>
Date.prototype.toFormatString = function(){
  var result = this.getFullYear() + "-" + (this.getMonth() + 1) + "-" + this.getDate();
  return result;
};
  
var today = new Date();
var month_big = new Array("1","3","5","7","8","10","12"); //包含所有大月的数组
var month_small = new Array("4","6","9","11"); //包含所有小月的数组 

//判断数组array中是否包含元素obj的函数，包含则返回true，不包含则返回false
function array_contain(array, obj){
  for (var i = 0; i < array.length; i++){
    if (array[i] == obj)
      return true;
  }
  return false;
}

//判断年份year是否为闰年，是闰年则返回true，否则返回false
function isLeapYear(year){
  var a = year % 4;
  var b = year % 100;
  var c = year % 400;
  if( ( (a == 0) && (b != 0) ) || (c == 0) ){
    return true;
  }
  return false;
}

function hideCalendar(){
  var calbody = document.getElementById("cal_body");
  cal_body.style.display = "none";
}

function showCalendar(){  
  var calbody = document.getElementById("cal_body");
  var style = getDefaultStyle(calbody,"display");
  if(style == "none")
    cal_body.style.display = "block";
  if(style == "block")
    cal_body.style.display = "none";
  
  var date_text = document.getElementById("date_text");
  var val = date_text.value;
  init(val);
}

function init(val){  
  clearCube();
  
  var temp_date;
  var date_text = document.getElementById("date_text");
  if(val == ""){
    temp_date = today;
    date_text.value = today.toFormatString();
  }
  else{
    temp_date = new Date(val);    
  }
    
  var year = temp_date.getFullYear();
  var month = temp_date.getMonth() + 1;
  var date = temp_date.getDate();
  temp_date.setDate(1);
  
  var start = temp_date.getDay() + 7;
  var end;
  
  if(array_contain(month_big, month)){
    end = start + 31;
  }
  else if(array_contain(month_small, month)){
    end = start + 30;
  }
  else{
    if(isLeapYear(year)){
      end = start + 29;
    }
    else{
      end = start + 28;
    }
  }
  
  for(var i = start; i < end; i++){
    var cube = document.getElementsByClassName("cube").item(i);
    cube.innerHTML = i - start + 1;
    
    cube.style.cursor = "pointer";
    cube.onmouseover = function(){
      this.style.backgroundColor = '#0FF';
    }
    if(date == (i - start + 1))
      cube.style.backgroundColor = '#0FF';
    else{
      cube.onmouseout = function(){
        this.style.backgroundColor = '';
      }
    }
    cube.onclick = function(){
      date_text.value = year + "-" + month + "-" + this.innerHTML;
      
      cal_body.style.display = "none";    
    }
  }
  
  document.getElementById("text_year").value = year;
  document.getElementById("text_month").value = month;
}

function clearCube(){
  for(var i=7; i < 49; i++){
    var cube = document.getElementsByClassName("cube").item(i);
    cube.innerHTML = "";
    cube.style.backgroundColor = "";
  }
}

function yearDown(){
  if(isValidated()){
    var old_year = parseInt(document.getElementById("text_year").value);
    if(old_year > 1960){
      var year = old_year - 1;
      var month = parseInt(document.getElementById("text_month").value);
      var val = year + "-" + month + "-" + 1;
      init(val);
    }
  }
}

function yearUp(){
  if(isValidated()){
    var old_year = parseInt(document.getElementById("text_year").value);
    if(old_year < 2050){
      var year = old_year + 1;
      var month = parseInt(document.getElementById("text_month").value);
      var val = year + "-" + month + "-" + 1;
      init(val);
    }
  }
}

function monthDown(){
  if(isValidated()){
    var old_month = parseInt(document.getElementById("text_month").value)
    if(old_month > 1){
      var year = parseInt(document.getElementById("text_year").value);
      var month = old_month - 1;
      var val = year + "-" + month + "-" + 1;
      init(val);
    }
    else {
      var year = parseInt(document.getElementById("text_year").value) - 1;
      var month = 12;
      var val = year + "-" + month + "-" + 1;
      init(val);
    }
  }
    
}

function monthUp(){
  if(isValidated()){
    var old_month = parseInt(document.getElementById("text_month").value)
    if(old_month < 12){
      var year = parseInt(document.getElementById("text_year").value);
      var month = parseInt(document.getElementById("text_month").value) + 1;
      var val = year + "-" + month + "-" + 1;
      init(val);
    }
    else {
      var year = parseInt(document.getElementById("text_year").value) + 1;
      var month = 1;
      var val = year + "-" + month + "-" + 1;
      init(val);
    }
  }
}

function isValidated(){
  var year = document.getElementById("text_year").value;
  var month = document.getElementById("text_month").value;
  if(isNaN(year) || isNaN(month)){
    alert("请输入正确的年份/月份");
    return false;
  }
  else{
    if(year%1 != 0 || month%1 != 0){
      alert("请输入正确的年份/月份");
      return false;
    }
    else{
      year = parseInt(year);
      if(year < 1960 || year > 2050){
        alert("请输入1960~2050之间的年份！");
        return false;
      }
      else if(month < 1 || month >12){
        alert("请输入正确的月份！");
        return false;
      }
      else{
        return true;
      }
    }
  }
}

function changed(){
  if(isValidated()){
    var year = document.getElementById("text_year").value;
    var month = document.getElementById("text_month").value;
    var val = year + "-" + month + "-" + 1;
    init(val);
  }
}

function getDefaultStyle(obj,attribute){ 
   return obj.currentStyle&#63;obj.currentStyle[attribute]:document.defaultView.getComputedStyle(obj,false)[attribute];
}
</script>
</head>

<body>
<div id="container">
<div id="input_bg"><input id="date_text" type="text" readonly onClick="showCalendar()" /></div>
<div id="cal_body">
  <div class="line"><div class="btn" id="year_down" onClick="yearDown()">-</div><input class="year_month" id="text_year" value="2015" onChange="changed()"><div class="btn" id="year_up" onClick="yearUp()">+</div><span class="end_tag">年</span></div>
  <div class="line"><div class="btn" id="month_down" onClick="monthDown()">-</div><input class="year_month" id="text_month" value="5" onChange="changed()"><div class="btn" id="month_up" onClick="monthUp()">+</div><span class="end_tag">月</span></div>
  <div class="cube">日</div>
  <div class="cube">一</div>
  <div class="cube">二</div>
  <div class="cube">三</div>
  <div class="cube">四</div>
  <div class="cube">五</div>
  <div class="cube">六</div>
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</div>
<div>
</body>
</html>
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