How to dynamically insert an id into a table element using JavaScript?-JS Tutorial-php.cn

How to dynamically insert an id into a table element using JavaScript?

王林

Release： 2023-08-24 23:57:02

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如何使用 JavaScript 动态地将 id 插入到表元素中？

In this article, we will learn how to dynamically insert IDs into table elements using JavaScript with the help of setAttribute API.

In web development, dynamically inserting IDs into HTML table elements can be a useful technique when we need to uniquely identify and manipulate specific rows or cells. By programmatically assigning IDs to table elements, we gain more control and flexibility in accessing and modifying table content.

Let's go through some examples to understand how to achieve this.

Example 1

In this example, we generate random IDs for table rows by counting the total number of available rows and appending that count to an empty string.

File name: index.html

<html lang="en">
   <head>
      <title>How to dynamically insert id into table element using JavaScript?</title>
   </head>
   <body>
      <h3>How to dynamically insert id into table element using JavaScript?</h3>
      <table id="myTable">
         <tr>
            <th>Row</th>
            <th>Data</th>
         </tr>
      </table>
      <button onclick="addRow()">Add Row</button>
      <script>
         function addRow() {
            const table = document.getElementById("myTable");
            const row = table.insertRow();
            const rowId = "" + (table.rows.length - 1); // Generate a unique ID
            row.id = rowId; // Set the ID of the row

            // Add cells to the new row
            const cell1 = row.insertCell(0);
            const cell2 = row.insertCell(1);

            // Insert content into cells
            cell1.innerHTML = "Row " + (table.rows.length - 1);
            cell2.innerHTML = "Data " + (table.rows.length - 1);
         }
      </script>
   </body>
</html>

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Example 2

In this example, we will follow the above code pattern and generate random ids for table cells using 3 different methods with the help of classList method, classList object and id property of dataset object. < /p>

File name: index.html

<html lang="en">
   <head>
      <title>
         How to dynamically insert id into table element using JavaScript?
      </title>
   </head>
   <body>
      <h3>How to dynamically insert id into table element using JavaScript?</h3>
      <table id="myTable">
         <tr>
            <th>Row</th>
            <th>Data</th>
         </tr>
      </table>
      <button onclick="addRowUsingObj()">Add Row Using classList object</button>
      <button onclick="addRowUsingMethod()">
         Add Row Using classList method
      </button>
      <button onclick="addRowUsingId()">Add Row Using the id property</button>
      <script>
         const table = document.getElementById("myTable");

         function addRowUsingObj() {
            // Example 1: Using classList object
            const row1 = table.insertRow();
            row1.classList.add("custom-row");

            // Insert content into cells
            const cell1 = row1.insertCell();
            const cell2 = row1.insertCell();
            cell1.innerHTML = "Row " + (table.rows.length - 1);
            cell2.innerHTML = "Data " + (table.rows.length - 1);
         }
 
         function addRowUsingMethod() {
            // Example 2: Using classList method
            const row3 = table.insertRow();
            row3.classList.add("row-highlight");

            // Insert content into cells
            const cell1 = row3.insertCell();
            const cell2 = row3.insertCell();
            cell1.innerHTML = "Row " + (table.rows.length - 1);
            cell2.innerHTML = "Data " + (table.rows.length - 1);
         }

         function addRowUsingId() {
            // Example 3: Using the id property of the dataset object
            const row4 = table.insertRow();
            const rowId = "row-" + (table.rows.length - 1); // Generate a unique ID
            row4.dataset.id = rowId; // Set the ID of the row

            // Insert content into cells
            const cell1 = row4.insertCell();
            const cell2 = row4.insertCell();
            cell1.innerHTML = "Row " + (table.rows.length - 1);
            cell2.innerHTML = "Data " + (table.rows.length - 1);
            // Add more cells and content for the other examples if needed
         }
      </script>
   </body>
</html>

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in conclusion

In summary, using JavaScript to dynamically insert IDs into table elements enables efficient manipulation and interaction with specific elements in the table. In the provided example, we learned how to dynamically insert IDs into table rows and cells. By leveraging JavaScript methods like insertRow, insertCell, etc. and manipulating the id attribute, we generate unique IDs and associate them with the corresponding table elements.

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