jquery changes table row text color

In web development, tables have always been one of our commonly used elements. In tables, we sometimes need to modify the styles of certain rows or columns, such as modifying the text color of rows. This article will introduce how to use jQuery to modify the text color of table rows.

1. Create a table

First, we need to create a simple table to experiment with:

<table id="myTable">
  <tr>
    <td>John</td>
    <td>Doe</td>
    <td>25</td>
  </tr>
  <tr>
    <td>Jane</td>
    <td>Doe</td>
    <td>30</td>
  </tr>
  <tr>
    <td>Bob</td>
    <td>Smith</td>
    <td>40</td>
  </tr>
</table>

2. Select table rows using jQuery

Next, in jQuery, we need to use a selector to select each row in the table and specify their style. In this example, we select all odd rows in table #myTable and set their text color to red:

$("#myTable tr:nth-child(odd)").css("color", "red");

The meaning of this selector is: Selected #myTable The odd-numbered rows of all rows (that is, rows 1, 3, and 5), and modify their text color to red.

3. Add a style class to the table row

We can also add a style class (such as highlight) to the table row, and then use CSS to Define the style of this class in the style sheet:

.highlight {
    background-color: yellow;
}

Then, use the following code in jQuery to select all rows in the table #myTable and use addClass() The method adds a style with the class name highlight to each row:

$("#myTable tr").addClass("highlight");

In this example, we select all the rows in the table #myTable and Add style class highlight to them.

4. Modify the style based on the cell value

In addition to modifying the style by row, we can also modify the style in the table based on the cell value. For example, in the following example, we select all cells in table #myTable whose 3rd column (age) is greater than or equal to 30, and set their text color to green:

$("#myTable td:nth-child(3)").filter(function() {
    return parseInt($(this).text()) >= 30;
}).css("color", "green");

The meaning of this selector is: select all the cells in column 3 (age) in the table #myTable, and use the filter() method to filter out the text conversion in the cells After being converted into integers greater than or equal to 30, their text color is finally set to green.

Summary

In this article, we introduced how to use jQuery to modify the text color of table rows. We can use selectors to select rows or cells in the table and modify their styles. When editing a table, similar operations can also be used to modify other style effects in the table, such as border color, background color, etc.

It is worth noting that in actual development, we need to optimize the performance of JavaScript and jQuery to avoid frequent reading and writing operations on the DOM. Therefore, when implementing complex table operations, we can consider reducing the number of operations or caching table data to improve processing efficiency.

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