原生js写个简单的数字键盘（by vczero）

一、起因

　　最近支付的同事说，数字键盘有些问题；在移动设备上有时候比较难出现点（.） 和数字在一起的格局；因此，考虑到这种情况，就建议手写个模拟键盘了。花了一晚上的时间，写了个简单的键盘，基本能用。考虑到有的开发者没有使用juqery,就使用原生的js了。

　　Github地址：https://github.com/vczero/keyboard

二、截图如下

三、体验地址（需要点击input才能弹出数字键盘的哦）

URL: http://vczero.github.io/num_key/index.html

当然可以扫二维码：

三、代码比较简单，直接贴了

 1 ;(function(exports){
 2     var KeyBoard = function(input, options){
 3         var body = document.getElementsByTagName(‘body‘)[0];
 4         var DIV_ID = options && options.divId || ‘__w_l_h_v_c_z_e_r_o_divid‘;
 5
 6         if(document.getElementById(DIV_ID)){
 7             body.removeChild(document.getElementById(DIV_ID));
 8         }
 9
10         this.input = input;
11         this.el = document.createElement(‘div‘);
12
13         var self = this;
14         var zIndex = options && options.zIndex || 1000;
15         var width = options && options.width || ‘100%‘;
16         var height = options && options.height || ‘193px‘;
17         var fontSize = options && options.fontSize || ‘15px‘;
18         var backgroundColor = options && options.backgroundColor || ‘#fff‘;
19         var TABLE_ID = options && options.table_id || ‘table_0909099‘;
20         var mobile = typeof orientation !== ‘undefined‘;
21
22         this.el.id = DIV_ID;
23         this.el.style.position = ‘absolute‘;
24         this.el.style.left = 0;
25         this.el.style.right = 0;
26         this.el.style.bottom = 0;
27         this.el.style.zIndex = zIndex;
28         this.el.style.width = width;
29         this.el.style.height = height;
30         this.el.style.backgroundColor = backgroundColor;
31
32         //样式
33         var cssStr = ‘<style type="text/css">‘;
34         cssStr += ‘#‘ + TABLE_ID + ‘{text-align:center;width:100%;height:160px;border-top:1px solid #CECDCE;background-color:#FFF;}‘;
35         cssStr += ‘#‘ + TABLE_ID + ‘ td{width:33%;border:1px solid #ddd;border-right:0;border-top:0;}‘;
36         if(!mobile){
37             cssStr += ‘#‘ + TABLE_ID + ‘ td:hover{background-color:#1FB9FF;color:#FFF;}‘;
38         }
39         cssStr += ‘</style>‘;
40
41         //Button
42         var btnStr = ‘<div style="width:60px;height:28px;background-color:#1FB9FF;‘;
43         btnStr += ‘float:right;margin-right:5px;text-align:center;color:#fff;‘;
44         btnStr += ‘line-height:28px;border-radius:3px;margin-bottom:5px;cursor:pointer;">完成</div>‘;
45
46         //table
47         var tableStr = ‘<table id="‘ + TABLE_ID + ‘" border="0" cellspacing="0" cellpadding="0">‘;
48             tableStr += ‘<tr><td>1</td><td>2</td><td>3</td></tr>‘;
49             tableStr += ‘<tr><td>4</td><td>5</td><td>6</td></tr>‘;
50             tableStr += ‘<tr><td>7</td><td>8</td><td>9</td></tr>‘;
51             tableStr += ‘<tr><td style="background-color:#D3D9DF;">.</td><td>0</td>‘;
52             tableStr += ‘<td style="background-color:#D3D9DF;">删除</td></tr>‘;
53             tableStr += ‘</table>‘;
54         this.el.innerHTML = cssStr + btnStr + tableStr;
55
56         function addEvent(e){
57             var ev = e || window.event;
58             var clickEl = ev.element || ev.target;
59             var value = clickEl.textContent || clickEl.innerText;
60             if(clickEl.tagName.toLocaleLowerCase() === ‘td‘ && value !== "删除"){
61                 if(self.input){
62                     self.input.value += value;
63                 }
64             }else if(clickEl.tagName.toLocaleLowerCase() === ‘div‘ && value === "完成"){
65                 body.removeChild(self.el);
66             }else if(clickEl.tagName.toLocaleLowerCase() === ‘td‘ && value === "删除"){
67                 var num = self.input.value;
68                 if(num){
69                     var newNum = num.substr(0, num.length - 1);
70                     self.input.value = newNum;
71                 }
72             }
73         }
74
75         if(mobile){
76             this.el.ontouchstart = addEvent;
77         }else{
78             this.el.onclick = addEvent;
79         }
80         body.appendChild(this.el);
81     }
82
83     exports.KeyBoard = KeyBoard;
84
85 })(window);

四、简单demo

 1 <!DOCTYPE html>
 2 <html>
 3     <head>
 4         <meta charset="utf-8" />
 5         <title>模拟数字键盘</title>
 6         <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0, minimal-ui" />
 7     </head>
 8     <body>
 9         <div>
10             <input id="text1" readonly="readonly" type="number" style="height:28px;width:98%;outline:none;border:1px solid #1AB6FF;padding-left:3px;"/>
11             <br />
12             <br />
13             <input id="text2" readonly="readonly" type="number" style="height:28px;width:98%;outline:none;border:1px solid #1AB6FF;padding-left:3px;"/>
14         </div>
15         <script type="text/javascript" src="keyboard.js"></script>
16         <script type="text/javascript">
17         (function(){
18             var input1 = document.getElementById(‘text1‘);
19             var input2 = document.getElementById(‘text2‘);
20
21             input1.onclick = function(){
22                 new KeyBoard(input1);
23             };
24
25             input2.onclick = function(){
26                 new KeyBoard(input2);
27             };
28
29
30         })();
31         </script>
32     </body>
33 </html>