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How to use js traversal to obtain data in the table

jacklove
jackloveOriginal
2018-06-09 09:55:054413browse

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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