How to use jQuery to open and close Div function

In modern Web development, interactive effects have become an important part of a website. Among them, dynamic opening and closing of Div is a frequently used function. This function can enhance the user experience and improve the use value of the website.

In this article, we will introduce how to use jQuery to realize the function of opening and closing Div. Let’s get started!

1. HTML code structure
First, we need to write an HTML code structure to implement this function. The code is as follows:

<div>
  <div></div>
  <div>
    <p>这里是面板内容</p>
  </div>
</div>

Here, we use a container element "container", which contains the title element "trigger" and the panel element "panel".

2. CSS Style
We can use CSS to define the styles of containers, titles and panels. The code is as follows:

.container {
  position: relative;
  width: 500px;
  margin: 0 auto;
}

.trigger {
  position: relative;
  height: 50px;
  background-color: #EEE;
}

.panel {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 0;
  overflow: hidden;
  transition: height 0.3s ease;
  background-color: #FFF;
}

In this CSS code, we set the container to be relatively positioned and centered. The header is defined as a block-level element with a background color, while the panel is set to be absolutely positioned and has a height of 0, which means the panel is not visible on the page. At the same time, we added a transition effect to the panel so that when it is opened or closed, the height will gradually change in 0.3 seconds. Finally, we set the background color of the panel to white.

3. JS code
Next, we need to use jQuery to write JS code to implement this function. The code is as follows:

$(document).ready(function() {
  $('.trigger').click(function() {
    var panel = $(this).next('.panel');
    if (panel.height() == 0) {
      panel.css('height', panel.prop('scrollHeight') + 'px');
    } else {
      panel.css('height', '0');
    }
  });
});

In this code, we use jQuery's "$" symbol instead of the "jQuery" keyword, so that our code looks more concise.

We first wrap this function in a $(document).ready() function, which is a jQuery function, indicating that the corresponding function will be executed when the DOM of the page is loaded.

Next, we use a ".click()" method to bind an event handler to the title element. When the title element is clicked, the event handler will be fired. We are using jQuery's ".next()" method to get the next element, in this case the panel element. We then check the panel element's height, and if it is 0, we set the panel element's height to its scroll height; otherwise, we set its height to 0, to close it.

4. Conclusion
In this article, we have learned how to use jQuery to realize the function of opening and closing Div. Although this is just a simple example, it illustrates how to use jQuery to control and manipulate page elements. We should note that when we implement dynamic effects, some CSS properties and jQuery functions may need to be adjusted on different browsers or devices. However, jQuery, as an open source JavaScript library, has played an important role in web development, and it will continue to be one of the tools we use in front-end development.

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