原生JavaScript实现一种日历
设计目标：不依赖其他库、兼容一些旧版浏览器、可配置可扩展。
测试页面：
1 <!DOCTYPE html>
2 <html lang="en">
3 <head>
4 <meta charset="UTF-8">
5 <title>测试日历控件</title>
6 <style>
7 #div1{
8 width: 256px;
9 height: 202px;
10 box-sizing: border-box;
11 background-color: #fff;
12 box-shadow: 1px 1px 3px #999;
13 position:absolute;
14 left:0px;
15 }
16 #div2 {
17 width: 236px;
18 height: 166px;
19 box-sizing: border-box;
20 background-color: #fff;
21 box-shadow: 1px 1px 3px #999;
22 position:absolute;
23 left:300px;
24 }
25 .select_date{
26 padding-left: 10px;box-sizing:border-box;width: 100px;height: 30px;background-color: #fff;font-size: 12px;float: left;line-height: 30px;
27 }
28 .span_rq{
29 width: 60px;display: inline-block;
30 }
31 </style>
32 <script src="DatePicker.js"></script>
33 </head>
34 <body>
35 <div id="div_all_base" style="background-color: beige">
36 <div id="div1">
37
38 </div>
39 <div id="div2">
40
41 </div>
42 <div style="width: 600px;height: 30px;left:600px;position:absolute;float:left" id="div3">
43 <div style="float: left;line-height: 30px;margin-left: 10px;font-size: 12px;">从</div>
44 <div class="select_date"><span class="span_rq">开始日期</span><img src="image/rili2.jpg" style="margin-left: 10px;width: 20px;margin-top: 6px;cursor: pointer" alt="" onclick="var divs=div_rilis.getElementsByClassName('div_rili');divs[0].style.display='block';divs[1].style.display='none'"></div>
45 <div style="position: absolute;width:256px;height: 202px;top:50px;display: none" class="div_rili"></div>
46 <div style="float: left;line-height: 30px;margin-left: 10px;font-size: 12px;">到</div>
47 <div class="select_date"><span class="span_rq">结束日期</span><img src="image/rili2.jpg" style="margin-left: 10px;width: 20px;margin-top: 6px;cursor: pointer" alt="" onclick="var divs=div_rilis.getElementsByClassName('div_rili');divs[1].style.display='block';divs[0].style.display='none'"></div>
48 <div style="position: absolute;width:256px;height: 202px;top:50px;left:120px;display: none" class="div_rili"></div>
49 </div>
50 </div>
51 </body>
52 <script>
53 var div_rilis=document.getElementById("div3");
54
55 var apiHost="http://127.0.0.1/api/v1";
56 var data_enabledate={list_enabledate:[{CBRQ:20201111},{CBRQ:20201112},{CBRQ:20201113},{CBRQ:20201114},{CBRQ:20201115}],type:"ok"};
57 //用AJAX从后端查询可选日期，需要返回数据的格式与data_enabledate相同
58 //var datepicker1=new DatePicker("datepicker1",{pickcallback:loadPage,bannerBackColor:"rgb(0,112,192)",searchEnableUrl:apiHost+"/public/searchEnableDate"});//
59 //直接用前端数据，设置了点击回调、banner颜色、激活日期
60 var datepicker1=new DatePicker("datepicker1",{pickcallback:loadPage,bannerBackColor:"rgb(0,112,192)",searchEnableUrl:data_enabledate});
61 var div_rili1=document.getElementById("div1");
62 div_rili1.appendChild(datepicker1.div);
63 datepicker1.reloadDateList();
64
65 //设置更多的配置项，被点击的按钮变色，程序可以在一定的范围内根据外围div的大小调整每个按钮的尺寸，另外设置了字体大小，以及允许点击未激活日期
66 var datepicker2=new DatePicker("datepicker2",{
67 pickcallback:function(str_date,that){
68 datepicker2.pick0(str_date);
69 loadPage(str_date);
70 },bannerBackColor:"rgb(0,112,192)",width:236,height:166,shadowSize:0,paddingSize:0,
71 searchEnableUrl:data_enabledate,contentFontSize:9,flag_canPickUnEnabled:true,
72 });
73 var div_rili2=document.getElementById("div2");
74 div_rili2.appendChild(datepicker2.div);
75 datepicker2.reloadDateList();
76
77 function loadPage(str_date){
78
79 alert("点击的日期是"+str_date);
80 }
81
82 //常用的起始日期和结束日期，这里设置了每个日历的title，不区分激活按钮，并且把日历的值与span的innerHTML关联起来（使用arr_valuelink属性可以关联input或textview的value）
83 var divs=div_rilis.getElementsByClassName('div_rili');
84 var spans=div_rilis.getElementsByClassName("span_rq");
85 var datepicker1b=new DatePicker("datepicker1b",{pickcallback:function(value,that){
86 var divs=div_rilis.getElementsByClassName('div_rili');
87 divs[0].style.display='none';
88 divs[1].style.display='none';
89 DatePicker.linkValue(value,that)
90 },bannerBackColor:"rgb(0,112,192)",arr_innerlink:[spans[0]],title:"开始日期"});//与react不同这里的spans在onload后不会再重新生成，所以可以直接关联dom对象！！
91 var datepicker2b=new DatePicker("datepicker2b",{pickcallback:function(value,that){
92 var divs=div_rilis.getElementsByClassName('div_rili');
93 divs[0].style.display='none';
94 divs[1].style.display='none';
95 DatePicker.linkValue(value,that)
96 },bannerBackColor:"rgb(0,112,192)",arr_innerlink:[spans[1]],title:"结束日期"});
97 divs[0].appendChild(datepicker1b.div);
98 divs[1].appendChild(datepicker2b.div);
99 datepicker1b.reloadDateList();
100 datepicker2b.reloadDateList();
101 </script>
102 </html>
日历按钮图片：
代码实现：（建议从后往前看）
1 DatePicker=function(id,obj_p)
2 {
3 //如果已经有这个div则建立失败
4 var div=document.getElementById("id");
5 if(div)
6 {
7 console.log("组件id重复，请使用其他组件id");
8 return;
9 }
10 div=document.createElement("div");//最外层容器
11 this.id=id;
12 this.div=div;
13 div.id=id;
14 var _this=this;
15
16 this.width=obj_p.width||256;
17 this.height=obj_p.height||202;
18 this.shadowSize=obj_p.shadowSize||4;
19 this.shadowColor=obj_p.shadowColor||"rgb(203,203,203)";
20 this.backColor=obj_p.backColor||"white";
21 //this.boxShadow=obj_p.boxShadow||"inset 0 0 4px 4px rgb(203,203,203)";
22 div.style.border="0px";
23 div.style.width=this.width+"px";
24 div.style.height=this.height+"px";
25 div.style.boxShadow="inset 0 0 "+this.shadowSize+"px "+this.shadowSize+"px "+this.shadowColor;
26 div.style.position="absolute";
27 div.style.backgroundColor=this.backColor;
28
29 this.title=obj_p.title||"日期选择";
30 //this.noTitle=obj.noTitle||false;
31 //this.noBanner=obj.noBanner||false;
32 this.h1=obj_p.h1||24;//最上面的一行空间
33 this.h2=obj_p.h2||24;
34 //this.h3=obj_p.h3||208;
35 this.titleFontSize=obj_p.titleFontSize||12;
36 this.contentFontSize=obj_p.contentFontSize||10;
37 var span=document.createElement("span")//日历的标题栏
38 span.innerText=this.title;
39 span.style.height=this.h1+"px";
40 span.style.fontSize=this.titleFontSize+"px";
41 span.style.fontWeight="bold";
42 span.style.lineHeight=this.h1+"px";
43 span.style.display="inline-block";
44 span.style.left=this.shadowSize+"px";
45 span.style.paddingLeft=this.shadowSize+"px";
46 span.style.position="absolute";
47 span.style.zIndex="2";
48 div.appendChild(span);
49
50 this.bannerBackColor=obj_p.bannerBackColor||"rgb(169,16,10)";
51 this.bannerFontColor=obj_p.bannerFontColor||"white";
52 this.date=obj_p.date||(new Date());//默认日期
53 this.year=this.date.getFullYear();
54 this.month=this.date.getMonth();
55 this.day31=this.date.getDate();
56 this.day7=this.date.getDay();
57 this.arr_day7=obj_p.arr_day7||["","一","二","三","四","五","六","日"];
58 this.arr_bannerp=obj_p.arr_bannerp||([//用来调整年月的按钮
59 {id:"btn1",width:10,marginLeft:20,text:"《",onclick:function(){_this.year-=10;_this.changeYear()}}
60 ,{id:"btn2",width:10,marginLeft:5,text:"〈",onclick:function(){_this.year-=1;_this.changeYear()}}
61 ,{id:"btn3",width:40,marginLeft:5,text:this.year,onclick:function(){}}
62 ,{id:"btn4",width:10,marginLeft:5,text:"〉",onclick:function(){_this.year+=1;_this.changeYear()}}
63 ,{id:"btn5",width:10,marginLeft:5,text:"》",onclick:function(){_this.year+=10;_this.changeYear()}}
64 ,{id:"btn6",width:10,marginLeft:50,text:"〈",onclick:function(){_this.month-=1;if(_this.month<0){_this.month=11;_this.year-=1;}_this.changeMonth();_this.changeYear()}}
65 ,{id:"btn7",width:20,marginLeft:5,text:this.month+1,onclick:function(){}}
66 ,{id:"btn8",width:10,marginLeft:5,text:"〉",onclick:function(){_this.month+=1;if(_this.month>11){_this.month=0;_this.year+=1;}_this.changeMonth();_this.changeYear()}}
67 ])
68
69 var div_banner=document.createElement("div");
70 div_banner.style.height=this.h2+"px";
71 //div_banner.style.width="100%";
72 div_banner.style.left=this.shadowSize+"px";
73 div_banner.style.right=this.shadowSize+"px";
74 div_banner.style.top=this.h1+"px";
75 div_banner.style.position="absolute";
76 div_banner.style.backgroundColor=this.bannerBackColor;
77 div_banner.style.lineHeight=this.h2+"px";
78 div_banner.style.zIndex="2";
79 //div_banner.style.fontSize=this.contentFontSize+2+"px";
80 //div_banner.style.color=this.bannerFontColor;
81 //div_banner.style.fontWeight="bold";
82
83 //this.changeYearBack=obj_p.
84
85 var len=this.arr_bannerp.length;
86 var sum_left=0;
87 for(var i=0;i<len;i++)//banner上调整年月的按钮
88 {
89 var bannerp=this.arr_bannerp[i];
90 var btn=document.createElement("button");
91 btn.id=bannerp.id;
92 btn.style.position="absolute";
93 btn.style.backgroundColor=this.bannerBackColor;
94 btn.style.border="0px";
95 btn.style.padding="0px";
96 btn.style.textAlign="center";
97 btn.style.color=this.bannerFontColor;//button这个属性并不会自动继承
98 btn.style.fontWeight="bold";
99 btn.style.fontSize=this.contentFontSize+2+"px";
100 btn.style.height="100%";
101 btn.style.lineHeight=this.h2+"px";
102 btn.style.width=bannerp.width+"px";
103 btn.style.left=sum_left+bannerp.marginLeft+"px";
104 btn.innerText=bannerp.text;
105 btn.onclick=bannerp.onclick;
106 sum_left+=(bannerp.width+bannerp.marginLeft);
107 this[btn.id]=btn;
108 div_banner.appendChild(btn);
109 }
110 div.appendChild(div_banner);
111 this.paddingSize=obj_p.paddingSize||6;
112
113 this.gridBackColor=obj_p.gridBackColor||"#eeeeee";//单元格背景颜色
114 this.gridColor=obj_p.gridColor||"#000000";//本月单元格的文字颜色
115 this.gridColor0=obj_p.gridColor0||"#888888";//连带显示的非本月单元格的文字颜色
116 this.hoverBorderColor=obj_p.hoverBorderColor||"#888888";//鼠标移入可选单元格后的边框颜色
117 this.enableBackColor=obj_p.enableBackColor||"rgb(207,232,252)";//可以被选择的单元格的背景颜色
118 this.enableBackColorPicked=obj_p.enableBackColorPicked||"rgb(252,232,207)";
119 var div_list=document.createElement("div");//按钮容器
120 var int1=this.shadowSize+this.paddingSize;
121 div_list.style.left=int1+"px";
122 div_list.style.right=int1+"px";
123 div_list.style.top=int1+"px";
124 div_list.style.bottom=this.shadowSize+"px";
125 div_list.style.position="absolute";
126 div_list.style.backgroundColor=this.gridBackColor;
127 div.appendChild(div_list);
128 this.sizex=Math.floor((this.width-int1*2)/7);//按钮尺寸
129 this.sizey=Math.floor((this.height-int1-this.shadowSize-(this.h1+this.h2-this.shadowSize-this.paddingSize))/7);
130 this.pickcallback=obj_p.pickcallback;//鼠标点击日期按钮之后的响应方法
131 this.div_list=div_list;
132 this.obj_enable={};
133 this.searchEnableUrl=obj_p.searchEnableUrl;//||apiHost+"/public/searchEnableDate";
134 this.flag_canPickUnEnabled=obj_p.flag_canPickUnEnabled||false;//是否可以点击不激活的按钮
135 if(!this.searchEnableUrl)//根本不区分按钮是否激活
136 {
137 this.flag_canPickUnEnabled=true;
138 }
139 //this.reloadDateList(obj_p.initcallback);
140 //将日历的选择值与某些dom对象关联起来
141 this.arr_innerlink=obj_p.arr_innerlink||[];
142 this.arr_valuelink=obj_p.arr_valuelink||[];
143 }
144 DatePicker.linkValue=function(value,that)//改变与日历相关联的dom对象的值
145 {
146 var len=that.arr_innerlink.length;
147 for(var i=0;i<len;i++)
148 {
149 that.arr_innerlink[i].innerHTML=value;
150 }
151 var len=that.arr_valuelink.length;
152 for(var i=0;i<len;i++)
153 {
154 that.arr_valuelink[i].value=value;
155 }
156 }
157 DatePicker.prototype.changeYear=function()
158 {
159 this.btn3.innerText=this.year;
160 this.reloadDateList();//根据当前月份重新排列日期btn
161 console.log("改变了年份")
162 }
163 DatePicker.prototype.changeMonth=function()
164 {
165 this.btn7.innerText=this.month+1;
166 console.log("改变了月份")
167 }
168 DatePicker.DrawButton=function(that,callback)
169 {//重新渲染选中月份的日历按钮
170 try {
171
172 var sizex = that.sizex;//每个小块的宽度
173 var sizey = that.sizey;//每个小块的宽度
174 var date_list = new Date(that.year + "-" + (that.month + 1) + "-1");//取这个月的第一天
175 var day7_list = date_list.getDay();//是周几
176 //上一个月有几天？
177 var date_list0 = date_list - 1000 * 60 * 60;//上个月的最后一天
178 var day31_list0 = (new Date(date_list0)).getDate();//是几号
179
180 var int3 = that.month + 2;
181 var int4 = that.year;
182 if (int3 > 12) {
183 int3 = 1;
184 int4++;
185 }
186 var date_list2 = new Date(int4 + "-" + (int3) + "-1");//取下个月的第一天
187 var date_list1 = date_list2 - 1000 * 60 * 60;//这个月的最后一天
188 var day31_list1 = (new Date(date_list1)).getDate();//是几号
189 for (var i = 0; i < (day7_list - 1); i++) {//补齐日历第一行的灰色部分
190 that.arr_date.push({text: day31_list0 - (day7_list - 2 - i), inmonth: false})
191 }
192 if(that.searchEnableUrl)//如果要区分按钮是否激活
193 {
194 var list_enabledate = that.obj_json.list_enabledate;
195 for (var i = 1; i <= day31_list1; i++) {
196 var len = list_enabledate.length;
197 var str_fulldate = that.year + (that.month + 1 + 100 + "").substr(1) + (i + 100 + "").substr(1);
198 var obj = {text: i, inmonth: true, isenable: false, str_fulldate: str_fulldate};
199 for (var j = 0; j < len; j++) {
200 if (list_enabledate[j].CBRQ == (str_fulldate)) {
201 obj.isenable = true;
202 //obj.str_fulldate=str_fulldate;
203 break;
204 }
205 }
206 that.arr_date.push(obj);
207 }
208 }
209 else {
210 for (var i = 1; i <= day31_list1; i++) {
211 var str_fulldate = that.year + (that.month + 1 + 100 + "").substr(1) + (i + 100 + "").substr(1);
212 var obj = {text: i, inmonth: true, isenable: false, str_fulldate: str_fulldate};
213 //obj.isenable = true;<-在不区分是否激活的情况下，不需要变色标记
214 that.arr_date.push(obj);
215 }
216 }//将本月内的日期对象推入
217
218 var len = that.arr_date.length;
219 for (i = 0; i < (42 - len); i++) {//补上本月剩余的灰色部分
220 that.arr_date.push({text: i + 1, inmonth: false})
221 }
222 //开始绘制按钮
223 var int2 = that.h1 + that.h2 - that.shadowSize - that.paddingSize;
224 for (var i = 0; i < 7; i++)//对于每一行
225 {
226 for (var j = 0; j < 7; j++) {
227
228 (function () {//这里需要用闭包避免var变量污染
229 var div = document.createElement("div");
230 div.class = "div_riligrid";
231 //div.className="div_riligrid";
232 div.style.position = "absolute";
233 div.style.display = "inline-block";
234 div.style.top = i * sizey + int2 + "px";
235 div.style.left = j * sizex + "px";
236 div.style.width = sizex + "px";
237 div.style.height = sizey + "px";
238
239 //div.style.borderWidth="0px"
240 //div.style.borderColor=that.hoverBorderColor
241 div.style.textAlign = "center";
242
243
244 if (i == 0)//第一行显示一周七天的名字，按中式习惯从周一到周日显示
245 {
246 div.style.color = that.gridColor;
247 div.innerText = that.arr_day7[j + 1];
248 div.style.fontSize = that.contentFontSize + "px";
249 div.style.cursor = "default";
250 }
251 else//接下来根据列表生成日期小块
252 {
253 div.style.fontSize = that.contentFontSize + 4 + "px";
254 div.style.cursor = "pointer";
255 var index = (i - 1) * 7 + j;
256 (function () {
257 var obj = that.arr_date[index];
258 div.innerText = obj.text;
259 if (!obj.inmonth) {//对于不在本月内的占位按钮
260 div.style.color = that.gridColor0;
261 }
262 else//根据条件判断按钮是否可点击
263 {
264 div.style.color = that.gridColor;
265 //obj.isEnabled=false;
266 //div.style.borderWidth
267 /*div.onclick=function(){
268 that.pickcallback(obj.text)
269 }*/
270 div.style.top = i * sizey + int2 + 1 + "px";
271 div.style.left = j * sizex + 1 + "px";
272 div.style.width = sizex - 2 + "px";
273 div.style.height = sizey - 2 + "px";
274 if (obj.isenable == true || that.flag_canPickUnEnabled) {
275 div.onclick = function () {
276 //obj.isenable
277 that.pickcallback(obj.str_fulldate,that)
278 }
279 }
280
281 //div.style.border="1px solid "+that.hoverBorderColor;
282 //鼠标移入移出事件
283 div.onpointerenter = function () {//鼠标移入时显示边框
284 div.style.border = "1px solid " + that.hoverBorderColor;
285 }
286 div.onpointerleave = function () {
287 div.style.border = "0px"
288 }
289 that.obj_enable["div_" + obj.str_fulldate] = div;
290 if (obj.isenable) {
291 div.style.backgroundColor = that.enableBackColor;
292
293 }
294 }
295 })()
296 //事件
297 }
298 that.div_list.appendChild(div);
299 })()
300 }
301 }
302 that.inited=true;
303 if (that.true_cbrq) {
304 that.pick(that.true_cbrq);
305 }
306 if (callback) {
307 callback();
308 }
309 }catch(e)
310 {
311 alert(e);
312 console.log(e);
313 }
314 }
315 DatePicker.prototype.reloadDateList=function(callback)
316 {//重新渲染当前月份日历按钮前，从后台查询本月激活按钮
317 console.log("重新加载日期列表")//7*6标准
318 this.arr_date=[];
319 this.obj_enable={};
320 this.div_list.innerHTML="";
321 var that=this;
322 //有可能不需要后台查询！
323 if(this.searchEnableUrl)
324 {
325 if(typeof searchEnableUrl=="string") {//如果url是字符串
326
327
328 //先绘制标签还是先查询标签限制？
329 var ajax = createXMLHttpRequest();
330 ajax.open("POST", this.searchEnableUrl);
331 ajax.onreadystatechange = function () {//这里取到的this时ajax对象！
332 if (ajax.readyState == 4) {
333
334 if (ajax.status == 200) {
335 var str_json = ajax.responseText;
336 try {
337 var obj_json = JSON.parse(str_json);
338 if (obj_json.type == "ok") {
339 that.obj_json = obj_json;
340 DatePicker.DrawButton(that, callback);
341
342 }
343 else if (obj_json.type == "error") {
344 alert(obj_json.str_res);
345 console.log(obj_json.str_res);
346 }
347 }
348 catch (e) {
349 alert(e);
350 console.log(e);
351 }
352 ajax.abort();
353 }
354 }
355 }
356
357 //var obj_json={ str_month:this.year+(this.month+1+100+"").substr(1)}
358 //ajax.send(JSON.stringify(obj_json));//总之sb2的servlet不能自动转化json和FormData
359 var formData = new FormData()
360 formData.append("str_month", this.year + (this.month + 1 + 100 + "").substr(1));
361 ajax.send(formData);
362 //
363 }
364 else {
365 that.obj_json = this.searchEnableUrl;//不去后端查询，直接把searchEnableUrl作为所需数据
366 DatePicker.DrawButton(that, callback);
367 }
368 }
369 else {
370 DatePicker.DrawButton(that,callback);
371 }
372
373 }
374 DatePicker.prototype.pick0=function(true_cbrq)//通过代码设置被选中按钮，
375 {//如果被选中按钮在另一个月，则日历会自动跳转到相应月份，并且改变被选中按钮的颜色
376 var year=parseInt(true_cbrq.substr(0,4));
377 var month=parseInt(true_cbrq.substr(4,2));
378 var day31=true_cbrq.substr(6,2);
379 this.true_cbrq=true_cbrq;
380 if(this.year!=year||(this.month+1)!=month)
381 {
382 this.year=year;
383 this.month=month-1;
384 this.true_cbrq=true_cbrq;
385 this.changeMonth();
386 this.changeYear();
387 //this.reloadDateList()
388
389 }
390 else
391 {
392 if(this.inited)
393 {
394 this.pick(true_cbrq)
395 }
396 else {
397 this.reloadDateList();
398 }
399 }
400 }
401 DatePicker.prototype.pick=function(true_cbrq)//修改被点击按钮的颜色
402 {
403 if(this.grid_picked)
404 {
405 this.grid_picked.style.backgroundColor=this.enableBackColor;
406
407 }
408 var grid=this.obj_enable["div_"+true_cbrq];
409 if(grid)
410 {
411 grid.style.backgroundColor=this.enableBackColorPicked;
412 this.grid_picked=grid;
413 }
414 }
415 DatePicker.getDateStr=function(dt)//以下是一些辅助方法
416 {
417 var arr_day=["","一","二","三","四","五","六","日"];
418 var str_date=dt.getFullYear()+"年"+(dt.getMonth()+1)+"月"+dt.getDate()+"日 星期"+arr_day[dt.getDay()];
419 return str_date;
420 }
421 DatePicker.getDateStr2=function(dt)//标准八位日期
422 {
423 var str_date2=dt.getFullYear()+(dt.getMonth()+1+100+"").substr(1)+(dt.getDate()+100+"").substr(1);
424 return str_date2;
425 }
426 //八位纯数字日期加两个杠，变成十位标准日期
427 DatePicker.addGang=function(str)
428 {
429 var str_res=str.substr(0,4)+"-"+str.substr(4,2)+"-"+str.substr(6,2);
430 return str_res;
431 }
432 //八位纯数字日期加上汉字年月日，并且去掉补位的0
433 DatePicker.addNYR=function(str)
434 {
435 var str_res=str.substr(0,4)+"年"+parseInt(str.substr(4,2))+"月"+parseInt(str.substr(6,2))+"日";
436 return str_res;
437 }
github地址：https://github.com/ljzc002/SimpleAni
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