jquery determines show and hide

jQuery determines display and hiding

jQuery is a JavaScript library widely used in web development. In web development, it is often necessary to show or hide certain elements based on conditional judgment. This function can be easily achieved using jQuery.

jQuery provides several methods to determine whether an element is shown or hidden. Here are some commonly used methods:

1. is() method

is() method is used to determine whether an element matches the specified selector or a specific DOM element. . If the condition is met, it returns true, otherwise it returns false.

Example:

if ($('#element').is(':visible')) {
  // 元素可见
} else {
  // 元素隐藏
}

In this example, use the is() method to determine whether the element is visible. If visible, the code in the if statement block is executed, otherwise the code in the else statement block is executed.

2. :visible selector

: The visible selector is used to select all visible elements. Returns true if the element is visible, false otherwise.

Example:

if ($('#element').is(':visible')) {
  // 元素可见
} else {
  // 元素隐藏
}

In this example, use the :visible selector to determine whether the element is visible. If visible, the code in the if statement block is executed, otherwise the code in the else statement block is executed.

3. :hidden selector

:hidden selector is used to select all hidden elements. Returns true if the element is hidden, false otherwise.

Example:

if ($('#element').is(':hidden')) {
  // 元素隐藏
} else {
  // 元素可见
}

In this example, use the :hidden selector to determine whether the element is hidden. If hidden, the code in the if statement block is executed, otherwise the code in the else statement block is executed.

4. show() method and hide() method

The show() method is used to display elements, and the hide() method is used to hide elements. Both methods can show or hide elements based on conditions.

Example:

if ($('#element').is(':hidden')) {
  $('#element').show();
} else {
  $('#element').hide();
}

In this example, first use the is() method to determine whether the element is hidden. If it is hidden, use the show() method to display the element. Otherwise, use the hide() method to hide the element. . This allows elements to be shown or hidden based on conditions.

5. toggle() method

toggle() method is used to switch elements between showing and hiding. If the element is hidden, use the show() method to display the element; if the element is displayed, use the hide() method to hide the element.

Example:

$('#element').toggle();

In this example, use the toggle() method to switch the display and hiding of elements.

Summary

The above introduces several methods for jQuery to determine display and hiding, including is() method, :visible selector, :hidden selector, show() method, hide() method and the toggle() method. You can easily display and hide elements by choosing different methods according to the actual situation.

The above is the detailed content of jquery determines show and hide. For more information, please follow other related articles on the PHP Chinese website!