JavaScript实现的日期控件-白红宇

JavaScript实现的日期控件

阅读量：6225 次

发布时间：2019-06-21

本文共 5241 字，大约阅读时间需要 17 分钟。

JavaScript实现的日期控件

它还会读取当前的时间

<html> <head> <style>  </style> <title>日期自动输入控件</title> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> </head> <style type="text/css"> .date-picker-wp { display: none; position: absolute; background: #f1f1f1; left: 40px; top: 40px; border-top: 4px solid #3879d9; } .date-picker-wp table { border: 1px solid #ddd; } .date-picker-wp td { background: #fafafa; width: 22px; height: 18px; border: 1px solid #ccc; font-size: 12px; text-align: center; } .date-picker-wp td.noborder { border: none; background: none; } .date-picker-wp td a { color: #1c93c4; text-decoration: none; } .strong {font-weight: bold} .hand {cursor: pointer; color: #3879d9} </style> <script type="text/javascript"> var DatePicker = function () { var $ = function (i) { return document.getElementById(i) }, addEvent = function (o, e, f) {o.addEventListener ? o.addEventListener(e, f, false) : o.attachEvent('on'+e, function(){f.call(o)})}, getPos = function (el) { for (var pos = {x:0, y:0}; el; el = el.offsetParent) { pos.x += el.offsetLeft; pos.y += el.offsetTop; } return pos; }; var init = function (n, config) { window[n] = this; Date.prototype._fd = function () {var d = new Date(this); d.setDate(1); return d.getDay()}; Date.prototype._fc = function () {var d1 = new Date(this), d2 = new Date(this); d1.setDate(1); d2.setDate(1); d2.setMonth(d2.getMonth()+1); return (d2-d1)/86400000;}; this.n = n; this.config = config; this.D = new Date; this.el = $(config.inputId); this.el.title = this.n+'DatePicker'; this.update(); this.bind(); }; init.prototype = { update : function (y, m) { var con = [], week = ['Su','Mo','Tu','We','Th','Fr','Sa'], D = this.D, _this = this; fn = function (a, b) {return '<td title="'+_this.n+'DatePicker" class="noborder hand" οnclick="'+_this.n+'.update('+a+')">'+b+'</td>'}, _html = '<table cellpadding=0 cellspacing=2>'; y && D.setYear(D.getFullYear() + y); m && D.setMonth(D.getMonth() + m); var year = D.getFullYear(), month = D.getMonth() + 1, date = D.getDate(); for (var i=0; i<week.length; i++) con.push('<td title="'+this.n+'DatePicker" class="noborder">'+week[i]+'</td>'); for (var i=0; i<D._fd(); i++ ) con.push('<td title="'+this.n+'DatePicker" class="noborder"> </td>'); for (var i=0; i<D._fc(); i++ ) con.push('<td class="hand" οnclick="'+this.n+'.fillInput('+year+', '+month+', '+(i+1)+')">'+(i+1)+'</td>'); var toend = con.length%7; if (toend != 0) for (var i=0; i<7-toend; i++) con.push('<td class="noborder"> </td>'); _html += '<tr>'+fn("-1, null", "<<")+fn("null, -1", "<")+'<td title="'+this.n+'DatePicker" colspan=3 class="strong">'+year+'/'+month+'/'+date+'</td>'+fn("null, 1", ">")+fn("1, null", ">>")+'</tr>'; for (var i=0; i<con.length; i++) _html += (i==0 ? '<tr>' : i%7==0 ? '</tr><tr>' : '') + con[i] + (i == con.length-1 ? '</tr>' : ''); !!this.box ? this.box.innerHTML = _html : this.createBox(_html); }, fillInput : function (y, m, d) { var s = this.config.seprator || '/'; this.el.value = y + s + m + s + d; this.box.style.display = 'none'; }, show : function () { var s = this.box.style, is = this.mask.style; s['left'] = is['left'] = getPos(this.el).x + 'px'; s['top'] = is['top'] = getPos(this.el).y + this.el.offsetHeight + 'px'; s['display'] = is['display'] = 'block'; is['width'] = this.box.offsetWidth - 2 + 'px'; is['height'] = this.box.offsetHeight - 2 + 'px'; }, hide : function () { this.box.style.display = 'none'; this.mask.style.display = 'none'; }, bind : function () { var _this = this; addEvent(document, 'click', function (e) { e = e || window.event; var t = e.target || e.srcElement; if (t.title != _this.n+'DatePicker') {_this.hide()} else {_this.show()} }); }, createBox : function (html) { var box = this.box = document.createElement('div'), mask = this.mask = document.createElement('iframe'); box.className = this.config.className || 'datepicker'; mask.src = 'javascript:false'; mask.frameBorder = 0; box.style.cssText = 'position:absolute;display:none;z-index:9999'; mask.style.cssText = 'position:absolute;display:none;z-index:9998'; box.title = this.n+'DatePicker'; box.innerHTML = html; document.body.appendChild(box); document.body.appendChild(mask); return box; } }; return init; }(); onload = function () { new DatePicker('_DatePicker_demo', { inputId: 'date-input', className: 'date-picker-wp', seprator: '-' }); } </script> <body bgcolor="#FFFFDB" text="#000000" leftmargin="0" topmargin="0" marginwidth="0" marginheight="0"> <form > <table border="0" width="60%" align="center"> <tr> <td width="45%" class="wr4" align="right"> 生日：</td> <td width="55%" class="wr4"> <input type="text" name="mtime" id="date-input"> <font color="RED">*</font> </td> </tr> <tr> <td width="45%" align="right"><input type = "submit" value = "确定"/></td> <td width="55%"><input type = "reset" value = "重置"/></td> </tr> </table> </form> </body> </html>

html页面中的js执行顺序：

1）在head标签内的最先执行

2）在body标签内的执行

3）当在 body标签中加了 onload 事件时对应的 js 最后执行，也就是当页面加载完在执行

注意：当在 body标签中加了 onload 事件时在head标签内，所引用外部的 js 不起作用，当换成在body 内部或</html>之上引用外部js时可正常引用

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