How to cancel hover event in jquery

jQuery is a very popular JavaScript library. It provides many convenient functions and methods, allowing developers to quickly and easily write JavaScript code and add interactive effects to web pages. Among them, the hover() method is used to bind mouse entry and exit events, but sometimes we need to cancel the hover event after a certain condition is triggered. This article will introduce how jQuery cancels the hover event.

First, let us take a look at the syntax of the hover() method:

$(selector).hover(handlerIn, handlerOut)

Among them, selector is the element selector to which the event is bound, and handlerIn is the function to be executed when the mouse enters the element. , handlerOut is the function to be executed when the mouse leaves the element.

If we want to cancel the hover event, we can use the off() method provided by jQuery. The off() method is used to remove one or more event handlers from an element.

The syntax is as follows:

$(selector).off(event,childSel,handler)

• event: required, indicating the event type to be deleted, multiple event types separated by spaces;
• childSel: optional, indicating Child elements of the element, only remove event handlers on the given child element;
• handler: Optional, indicating the specific handler for the event to be removed. If omitted, all events are deleted.

Therefore, if we want to cancel the hover event, we only need to use the following code:

$(selector).off('mouseenter mouseleave');

Among them, mouseenter and mouseleave correspond to the mouse enter and leave events respectively.

It should be noted that if the off() method is used to cancel the event, all event handlers will be deleted. If you only want to remove a certain event handler, you can use the third parameter of the off() method to specify the specific event handler to be deleted.

For example, suppose we have the following HTML code:

<div>鼠标悬停会出现提示</div>

We want to display a prompt box when the mouse hovers over the element, but under certain conditions (such as clicking other buttons When) you need to cancel the prompt box, you can use the following code:

$(function() {
  var $box = $('#box'); // 获取元素
  $box.hover(function() {
    // 鼠标进入时弹出提示框
    $box.append('<div>提示内容</div>');
  }, function() {
    // 鼠标离开时隐藏提示框
    $box.find('#tip').remove();
  });
  
  $('#button').on('click', function() {
    // 点击按钮解除hover事件
    $box.off('mouseenter mouseleave');
  });
});

In the above code, we first bind the hover event. When the mouse enters, the prompt box pops up, and when the mouse leaves, the prompt box is hidden. Then, when another button is clicked, we dismiss the hover event so that the user can no longer see the tooltip.

To summarize, it is very simple to use jQuery to cancel the hover event. You only need to use the off() method and specify the event type to be canceled. Of course, if we need to remove a specific event handler, we can also use the third parameter provided by the off() method.

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