How to quickly update tables with jquery

In front-end development, the display of tables is very common. However, when the data in the table needs to be updated, if traditional methods are used, such as directly modifying DOM elements, the readability and maintainability of the code will become very poor. At this time, the emergence of the jQuery library provides us with a solution for quickly updating tables.

jQuery is a very popular JavaScript library. Its main feature is that it provides a simple and fast API, which can help us operate the DOM elegantly and quickly build interactive pages. Among them, jQuery provides many convenient methods that can help us quickly update the data on the table. Let's explain the specific implementation step by step.

1. Get the table object

Before we start updating the table, we first need to get the table object. Table elements can be selected using jQuery's selectors. For example, if we have a table with an identifier of class "table-data", the code is as follows:

let table = $(".table-data");

Through this table object, we can operate on the table.

2. Use .text() to update cell content

If we only need to update the text content in the cell, we can use the .text() method to complete it. Get the cell element you want to modify through the selector, and then use the text() method to pass in the text content that needs to be updated through parameters. For example, modify the text in the cell in row 2, column 3 to "modified text":

let td = table.find("tr:eq(1) td:eq(2)");
td.text("修改后的文本");

It should be noted that the :eq selector is used here, which means to select a certain The element corresponding to the sequence number starts counting from 0. Therefore, tr:eq(1) means selecting the element in row 2 of the table, while td:eq(2) means selecting the cell element in column 3.

3. Use .attr() to update cell attributes

In addition to updating the text content in the cell, sometimes we also need to update the attributes in the cell. For example, we may need to update the data-* attributes in the cell, or modify the class attribute of the cell, etc. At this point, it can be done using the .attr() method. For example, modify the data-id attribute in the cell in row 2 and column 3 to 123:

let td = table.find("tr:eq(1) td:eq(2)");
td.attr("data-id", "123");

It should be noted that if multiple attributes need to be updated, the value can be passed through an object. For example, to modify the class attribute and data-id attribute of the cell in row 2 and column 3, the code is as follows:

let td = table.find("tr:eq(1) td:eq(2)");
td.attr({
  "class": "new-class",
  "data-id": "123"
});

4. Use .html() to update the cell content

Sometimes, When updating cell content, if the content that needs to be updated contains HTML tags, you can use the .html() method. Similar to using the .text() method, you can use the jQuery selector to select the cells that need to be updated, and then pass in the HTML code that needs to be updated through parameters. For example, modify the content in the cell in row 2 and column 3 to:

let td = table.find("tr:eq(1) td:eq(2)");
td.html("<a href='#'>链接文本</a>");

5. Use .replaceWith() and .replaceWith() to update the entire row

Sometimes we The entire row where the cell is located needs to be updated. In this case, using the above method will be a bit troublesome. At this point, you can use the .replaceWith() method to directly replace the entire line of HTML code. For example, replace the entire content of row 2 with:

let tr = table.find("tr:eq(1)");
tr.replaceWith("<tr><td>新的单元格内容1</td><td>新的单元格内容2</td><td>新的单元格内容3</td></tr>");

In addition, if you only need to modify the entire row where a certain cell is located, you can first obtain the HTML code of the entire row, and then modify the entire row where the cell is located. Just replace the line.

let td = table.find("tr:eq(1) td:eq(2)");
let tr = td.parents("tr");
tr.replaceWith("<tr><td>新的单元格内容1</td><td>新的单元格内容2</td><td>新的单元格内容3</td></tr>");

6. Use .empty() and .append() to update the table content

In addition to using the above methods to update cells or entire rows one by one, there is another way to use jQuery. empty() and .append() methods to clear the original content of the table and add new HTML code. For example, to replace the entire table content with new HTML code, you can use the following method:

let newHtml = "<table><tr><td>新的单元格内容1</td><td>新的单元格内容2</td><td>新的单元格内容3</td></tr></table>";
table.empty().append(newHtml);

The above are some methods of using jQuery to quickly update the table. Through this method, the table can be updated conveniently and quickly, and the code efficiency can be improved. Maintainability and readability also allow us to quickly modify and update the data in the table.

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