原生js制作简单的数字键盘

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

四、代码比较简单，直接贴了

;(function(exports){
  var KeyBoard = function(input, options){
    var body = document.getElementsByTagName('body')[0];
    var DIV_ID = options && options.divId || '__w_l_h_v_c_z_e_r_o_divid';

    if(document.getElementById(DIV_ID)){
      body.removeChild(document.getElementById(DIV_ID));
    }

    this.input = input;
    this.el = document.createElement('div');

    var self = this;
    var zIndex = options && options.zIndex || 1000;
    var width = options && options.width || '100%';
    var height = options && options.height || '193px';
    var fontSize = options && options.fontSize || '15px';
    var backgroundColor = options && options.backgroundColor || '#fff';
    var TABLE_ID = options && options.table_id || 'table_0909099';
    var mobile = typeof orientation !== 'undefined';

    this.el.id = DIV_ID;
    this.el.style.position = 'absolute';
    this.el.style.left = 0;
    this.el.style.right = 0;
    this.el.style.bottom = 0;
    this.el.style.zIndex = zIndex;
    this.el.style.width = width;
    this.el.style.height = height;
    this.el.style.backgroundColor = backgroundColor;

    //样式
    var cssStr = '<style type="text/css">';
    cssStr += '#' + TABLE_ID + '{text-align:center;width:100%;height:160px;border-top:1px solid #CECDCE;background-color:#FFF;}';
    cssStr += '#' + TABLE_ID + ' td{width:33%;border:1px solid #ddd;border-right:0;border-top:0;}';
    if(!mobile){
      cssStr += '#' + TABLE_ID + ' td:hover{background-color:#1FB9FF;color:#FFF;}';
    }
    cssStr += '</style>';

    //Button
    var btnStr = '<div style="width:60px;height:28px;background-color:#1FB9FF;';
    btnStr += 'float:right;margin-right:5px;text-align:center;color:#fff;';
    btnStr += 'line-height:28px;border-radius:3px;margin-bottom:5px;cursor:pointer;">完成</div>';

    //table
    var tableStr = '<table id="' + TABLE_ID + '" border="0" cellspacing="0" cellpadding="0">';
      tableStr += '<tr><td>1</td><td>2</td><td>3</td></tr>';
      tableStr += '<tr><td>4</td><td>5</td><td>6</td></tr>';
      tableStr += '<tr><td>7</td><td>8</td><td>9</td></tr>';
      tableStr += '<tr><td style="background-color:#D3D9DF;">.</td><td>0</td>';
      tableStr += '<td style="background-color:#D3D9DF;">删除</td></tr>';
      tableStr += '</table>';
    this.el.innerHTML = cssStr + btnStr + tableStr;

    function addEvent(e){
      var ev = e || window.event;
      var clickEl = ev.element || ev.target;
      var value = clickEl.textContent || clickEl.innerText;
      if(clickEl.tagName.toLocaleLowerCase() === 'td' && value !== "删除"){
        if(self.input){
          self.input.value += value;
        }
      }else if(clickEl.tagName.toLocaleLowerCase() === 'div' && value === "完成"){
        body.removeChild(self.el);
      }else if(clickEl.tagName.toLocaleLowerCase() === 'td' && value === "删除"){
        var num = self.input.value;
        if(num){
          var newNum = num.substr(0, num.length - 1);
          self.input.value = newNum;
        }
      }
    }

    if(mobile){
      this.el.ontouchstart = addEvent;
    }else{
      this.el.onclick = addEvent;
    }
    body.appendChild(this.el);
  }

  exports.KeyBoard = KeyBoard;

})(window);

五、简单demo

 <!DOCTYPE html>
 <html>
   <head>
     <meta charset="utf-8" />
     <title>模拟数字键盘</title>
     <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0, minimal-ui" />
   </head>
   <body>
     <div>
       <input id="text1" readonly="readonly" type="number" style="height:28px;width:98%;outline:none;border:1px solid #1AB6FF;padding-left:3px;"/>
       <br />
       <br />
       <input id="text2" readonly="readonly" type="number" style="height:28px;width:98%;outline:none;border:1px solid #1AB6FF;padding-left:3px;"/>
     </div>
     <script type="text/javascript" src="keyboard.js"></script>
     <script type="text/javascript">
     (function(){
       var input1 = document.getElementById('text1');
       var input2 = document.getElementById('text2');
       input1.onclick = function(){
         new KeyBoard(input1);
       };
       input2.onclick = function(){
         new KeyBoard(input2);
       };
     })();
     </script>
   </body>
 </html>

以上所述就是本文的全部内容了，希望大家能够喜欢。