for loop in html table row with code examples

A "for loop" is a control flow structure that allows you to iterate over a collection of items, such as an array or an object. In HTML, you can use a for loop to create a table by iterating over an array of data and generating a new row for each item in the array.

Here is an example of a for loop that generates a table with three rows, each containing a single cell with a number:

<table>
  <tbody>
    <tr>
        <th>Number</th>
    </tr>
    <script>
    var numbers = [1, 2, 3];
    for (var i = 0; i < numbers.length; i++) {
      document.write("<tr><td>" + numbers[i] + "</td></tr>");
    }
    </script>
  </tbody>
</table>

In this example, the var numbers = [1, 2, 3]; line declares an array of numbers that will be used to generate the rows of the table. The for loop starts with the for (var i = 0; i < numbers.length; i++) { line, which initializes a variable i to 0 and sets the condition for the loop to continue to i < numbers.length. The i++ at the end of the loop increments the value of i by 1 on each iteration.

Inside the loop, the document.write("<tr><td>" + numbers[i] + "</td></tr>"); line generates a new row for each item in the array, using the current value of i to access the corresponding item in the numbers array. The <tr> and <td> tags are used to create the table row and cell elements, respectively. The + numbers[i] + part is used to insert the number in the cell.

Here is another example, this time using an object of data to populate a table.

<table>
  <tbody>
    <tr>
        <th>Name</th>
        <th>Age</th>
    </tr>
    <script>
    var people = [
        { name: "John", age: 25 },
        { name: "Jane", age: 30 },
        { name: "Bob", age: 35 }
    ];
    for (var i = 0; i < people.length; i++) {
      document.write("<tr><td>" + people[i].name + "</td><td>" + people[i].age + "</td></tr>");
    }
    </script>
  </tbody>
</table>

In this example, the var people = [{ name: "John", age: 25 },{ name: "Jane", age: 30 },{ name: "Bob", age: 35 }]; line declares an array of objects with name and age properties. The for loop starts with the for (var i = 0; i < people.length; i++) { line, which initializes a variable i to 0 and sets the condition for the loop to continue to i < people.length. The i++ at the end of the loop increments the value of i by 1 on each iteration.

Inside the loop, the `document.write("<tr
In addition to creating a simple table with a for loop, you can also use JavaScript to add more advanced functionality to your table. For example, you can use JavaScript to sort the table by a specific column, filter the table based on certain criteria, or add pagination to the table to display a large number of rows in smaller chunks.

Sorting the table by a specific column can be accomplished by creating a custom sorting function and passing it to the Array.sort() method. Here is an example of how you might sort a table by the "name" column in ascending order:

var people = [
    { name: "John", age: 25 },
    { name: "Jane", age: 30 },
    { name: "Bob", age: 35 }
];

people.sort(function(a, b) {
  var nameA = a.name.toUpperCase();
  var nameB = b.name.toUpperCase();
  if (nameA < nameB) {
    return -1;
  }
  if (nameA > nameB) {
    return 1;
  }
  return 0;
});

Filtering the table based on certain criteria can be accomplished by creating a custom filtering function and passing it to the Array.filter() method. Here is an example of how you might filter a table to only display rows where the "age" column is greater than or equal to 30:

var people = [
    { name: "John", age: 25 },
    { name: "Jane", age: 30 },
    { name: "Bob", age: 35 }
];

var filteredPeople = people.filter(function(person) {
  return person.age >= 30;
});

Finally, adding pagination to a table can be accomplished by using JavaScript to calculate the number of pages needed based on the number of rows in the table, and then using a for loop to create the necessary page links. Here is an example of how you might add pagination to a table with 10 rows per page:

var people = [
    { name: "John", age: 25 },
    { name: "Jane", age: 30 },
    { name: "Bob", age: 35 },
    { name: "Tom", age: 40 },
    { name: "Jerry", age: 45 },
    { name: "Mike", age: 50 },
    { name: "Bob", age: 55 },
    { name: "John", age: 60 },
    { name: "Jane", age: 65 },
    { name: "Bob", age: 70 },
    { name: "Tom", age: 75 },
    { name: "Jerry", age: 80 },
    { name: "Mike", age: 85 },
    { name: "Bob", age: 90 },
    { name: "John", age: 95 },
    { name: "Jane", age: 100 }
];

var rowsPerPage = 10;
var totalPages = Math.ceil(people.length / rowsPerPage);

for (var i = 1; i <= totalPages; i++) {
  document.write("<a href='#'>" + i + "</a> ");
}

In this example, the var rowsPerPage = 10; line sets the number of rows per page, and the `

Popular questions

1. What is a for loop and how is it used in HTML?
   A for loop is a control flow structure that allows you to iterate over a collection of items, such as an array or an object. In HTML, you can use a for loop to create a table by iterating over an array of data and generating a new row for each item in the array.

2. How does the for loop know when to stop iterating?
   The for loop has a condition that determines when to stop iterating. This condition is typically set as a comparison between a variable (such as "i" in the example above) and the length of the array or object being iterated over.

3. How can I sort a table using JavaScript?
   You can sort a table using JavaScript by creating a custom sorting function and passing it to the Array.sort() method. The sorting function compares two elements of the array and returns a value indicating their sort order.

4. How can I filter a table based on certain criteria using JavaScript?
   You can filter a table based on certain criteria using JavaScript by creating a custom filtering function and passing it to the Array.filter() method. The filtering function should return true or false for each element in the array, indicating whether it should be included in the filtered result.

5. How can I add pagination to a table using JavaScript?
   You can add pagination to a table using JavaScript by calculating the number of pages needed based on the number of rows in the table, and then using a for loop to create the necessary page links. The for loop should iterate from 1 to the total number of pages, creating a link for each page. You can also use other libraries to paginate table.

Tag

Iteration