Quickly modify table javascript

Quickly modify table javascript

In modern websites, tables are very common and important components. Tables not only allow users to clearly see data, but also facilitate back-end developers to write. However, when tables become very large and complex, manually modifying the data becomes very time-consuming and labor-intensive. At this time, we can use javascript to help us quickly modify the table. In this article, we will introduce how to use JavaScript to quickly modify table data.

1. Table data structure

The first thing we need to understand is what the structure of the table is in the DOM tree. A table can be viewed as a two-dimensional array, with each cell corresponding to a row and a column, and a table is composed of many rows and columns. In JavaScript, we can obtain and operate elements in the table through the properties and methods of the table element.

The schematic diagram of the table data structure is as follows:

<table>
    <tr>
        <td>行1，列1</td>
        <td>行1，列2</td>
        <td>行1，列3</td>
    </tr>
    <tr>
        <td>行2，列1</td>
        <td>行2，列2</td>
        <td>行2，列3</td>
    </tr>
    <tr>
        <td>行3，列1</td>
        <td>行3，列2</td>
        <td>行3，列3</td>
    </tr>
</table>

We can see from the above schematic diagram that a table can contain multiple rows, and each row can contain multiple cells.

2. Get the data in the table

In JavaScript, we can get the rows and cells in the table through the rows attribute and cells attribute of the table element. The rows attribute returns an HTMLCollection consisting of all rows in the table, while the cells attribute returns an HTMLCollection consisting of all cells in the current row.

var table = document.getElementById("myTable"); // 获取table元素
var rows = table.rows; // 获取所有行
for (var i = 0; i < rows.length; i++) { // 循环所有行
    var cells = rows[i].cells; // 获取当前行中的所有单元格
    for (var j = 0; j < cells.length; j++) { // 循环当前行中的所有单元格
        var cell = cells[j]; // 获取当前单元格
        console.log(cell.innerHTML); // 输出单元格的内容
    }
}

3. Modify the data in the table

In javascript, we can modify the content in the table through the innerHTML attribute. The innerHTML property can get or set the content of any HTML element, including table cells, etc. The steps to modify table data are as follows:

1. Get all rows and cells based on the rows attribute and cells attribute of the table element.
2. Get the content in the cell through the innerHTML attribute.
3. Modify the content in the cell.
4. Write the modified content to the cell through the innerHTML attribute.

Code example:

var table = document.getElementById("myTable"); // 获取table元素
var rows = table.rows; // 获取所有行
for (var i = 0; i < rows.length; i++) { // 循环所有行
    var cells = rows[i].cells; // 获取当前行中的所有单元格
    for (var j = 0; j < cells.length; j++) { // 循环当前行中的所有单元格
        var cell = cells[j]; // 获取当前单元格
        var number = parseInt(cell.innerHTML); // 将单元格内容转换为整数
        cell.innerHTML = number + 1; // 将单元格中的数字+1
    }
}

4. Handling special situations

In actual development, the data in the table may have many special situations, such as total rows in the table , there are complex styles in the table, etc. In these special cases, we need to use more detailed and complex javascript operations to modify the table data. For example, for total rows, we need to identify and operate in a specific way.

Code example, obtain total rows in a specific way:

var table = document.getElementById("myTable"); // 获取table元素
var rows = table.rows; // 获取所有行
for (var i = 0; i < rows.length; i++) { // 循环所有行
    var cells = rows[i].cells; // 获取当前行中的所有单元格
    if (i == rows.length - 1) { // 判断是否是最后一行（合计行）
        var cell = cells[0]; // 获取合计行第一个单元格
        var number = parseInt(cell.innerHTML); // 将单元格内容转换为整数
        cell.innerHTML = number + 1; // 将单元格中的数字+1
    } else { // 如果不是合计行
        for (var j = 0; j < cells.length; j++) { // 循环当前行中的所有单元格
            var cell = cells[j]; // 获取当前单元格
            var number = parseInt(cell.innerHTML); // 将单元格内容转换为整数
            cell.innerHTML = number + 1; // 将单元格中的数字+1
        }
    }
}

Summary

Through this article we have learned how to quickly modify table data with javascript, including obtaining table data, Modify table data and handle special situations, etc. Through these methods, we can improve the processing efficiency of tabular data and reduce the burden of manual data processing. I believe that after mastering these skills, you will be able to manage and process table data more conveniently and efficiently.

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