jQuery Filtering

Apart from using css selectors to filter a elemnt we want, We can also use some built-in jquery methods to filter the element.

Method

Description

Example

first()

Selects the first element in the set of matched elements.

$("#container p").first().addClass("highlight");

last()

Selects the last element in the set of matched elements.

$("#container p").last().css("color", "blue");

q(index)

Selects the element at the specified index (0-based) in the set of matched elements.

$("#container p").eq(1).css("font-style", "italic");

filter(selector)

Reduces the set of matched elements to those that match the selector or pass the function's test.

$("#container p").filter(":contains('Third')").css("text-decoration", "underline");

not(selector)

Removes elements from the set of matched elements that match the selector.

$("#container p").not(":even").css("border", "2px dashed red");

Example

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>jQuery Filtering Example</title>
  <script src="https://code.jquery.com/jquery-3.6.4.min.js"></script>
  <style>
    div {
      padding: 10px;
      margin: 5px;
      border: 1px solid #ccc;
    }
    .highlight {
      background-color: lightyellow;
    }
  </style>
</head>
<body>

<div id="parentContainer">
  <p>First paragraph.</p>
  <p>Second paragraph.</p>
  <p>Third paragraph.</p>
</div>

<script>
  // Using first() to select the first element and apply styling
  $("#parentContainer p").first().addClass("highlight");

  // Using last() to select the last element and apply styling
  $("#parentContainer p").last().css("color", "blue");

  // Using eq() to select a specific index (1-based) and apply styling
  $("#parentContainer p").eq(1).css("font-style", "italic");

  // Using filter() to select elements based on a condition and apply styling
  $("#parentContainer p").filter(":contains('Third')").css("text-decoration", "underline");

  // Using not() to select elements that do not match a condition and apply styling
  $("#parentContainer p").not(":even").css("border", "2px dashed red");
</script>

</body>
</html>

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