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Detailed explanation of the usage code of how javascript traverses table data

伊谢尔伦Original: 2017-07-22 10:10:081338browse

Introduces how to use js to obtain the content of a certain cell in a table. The table is composed of table, tr, td and other html tags. table represents a table, tr represents a row, and td represents a column in a row.

1. The general table structure is as follows

<table>
 <tr>
  <td>id</td>
  <td>name</td>
 </tr>
 <tr>
  <td>1</td>
  <td>fdipzone</td>
 </tr>
 <tr>
  <td>2</td>
  <td>wing</td>
 </tr>
</table>

2. Method of traversing all contents in the table

First, you need to add an id to the table, so that you can easily locate which table. For example,

<table id="mytable"></table>
获取表格行数

<script type="text/javascript">
/** 
 * 获取表格行数
 * @param Int id 表格id
 * @return Int
 */
function getTableRowsLength(id){
  var mytable = document.getElementById(id);
  return mytable.rows.length;
}
</script>

Get the number of rows and columns in a table

<script type="text/javascript">
/** 
 * 获取表格某一行列数
 * @param Int id  表格id
 * @param Int index 行数
 * @return Int
 */
function getTableRowCellsLength(id, index){
  var mytable = document.getElementById(id);
  if(index<mytable.rows.length){
    return mytable.rows[index].cells.length;
  }else{
    return 0;
  }
}
</script>

Traverse the table contents and save them to the array

<script type="text/javascript">
/** 
 * 遍历表格内容返回数组
 * @param Int  id 表格id
 * @return Array
 */
function getTableContent(id){
  var mytable = document.getElementById(id);
  var data = [];
  for(var i=0,rows=mytable.rows.length; i<rows; i++){
    for(var j=0,cells=mytable.rows[i].cells.length; j<cells; j++){
      if(!data[i]){
        data[i] = new Array();
      }
      data[i][j] = mytable.rows[i].cells[j].innerHTML;
    }
  }
  return data;
}
</script>

3. Complete example of traversing table content

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
 <head>
 <meta http-equiv="content-type" content="text/html;charset=utf-8">
 <title> 获取表格内容 </title>
 <style type="text/css">
 table{width:300px; border:1px solid #000000; border-collapse:collapse;}
 td{border:1px solid #000000; border-collapse:collapse;}
 </style>
 <script type="text/javascript">

  /** 
   * 遍历表格内容返回数组
   * @param Int  id 表格id
   * @return Array
   */
  function getTableContent(id){
    var mytable = document.getElementById(id);
    var data = [];
    for(var i=0,rows=mytable.rows.length; i<rows; i++){
      for(var j=0,cells=mytable.rows[i].cells.length; j<cells; j++){
        if(!data[i]){
          data[i] = new Array();
        }
        data[i][j] = mytable.rows[i].cells[j].innerHTML;
      }
    }
    return data;
  }

  /** 
   * 显示表格内容
   * @param Int  id 表格id
   */
  function showTableContent(id){
    var data = getTableContent(id);
    var tmp = &#39;&#39;;
    for(i=0,rows=data.length; i<rows; i++){
      for(j=0,cells=data[i].length; j<cells; j++){
        tmp += data[i][j] + &#39;,&#39;;
      }
      tmp += &#39;<br>&#39;;
    }
    document.getElementById(&#39;result&#39;).innerHTML = tmp;
  }

 </script>
 </head>

 <body>
  <table id="mytable">
   <tr>
    <td>id</td>
    <td>name</td>
   </tr>
   <tr>
    <td>1</td>
    <td>fdipzone</td>
   </tr>
   <tr>
    <td>2</td>
    <td>wing</td>
   </tr>
  </table>

  <p><input type="button" name="btn" value="获取表格数据" onclick="showTableContent(&#39;mytable&#39;)"></p>
  <p><p id="result"></p></p>
 </body>
</html>

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