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How to use js traversal to obtain data in the table

jackloveOriginal: 2018-06-09 09:55:054399browse

This article will introduce how to use js to obtain the content of a certain cell in the 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 it is convenient to locate which table. For example

<table id="mytable"></table>

Get the number of rows in the table

<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 the 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 content and save it 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 the 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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How to use js traversal to obtain data in the table

1. The general table structure is as follows

2. Method of traversing all contents in the table

3. Complete example of traversing the table content

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