html show hide

Introduction to HTML display/hide technology

In web development, showing and hiding page elements is a common requirement. For example, when switching the content on the page, the corresponding pictures need to be displayed and hidden accordingly. In order to solve this problem, developers need to master the display and hiding technology, which is an important technology to make the website more friendly and flexible.

There are many ways to show/hide an element. This article will introduce the following four methods:

1. Using JavaScript
   By writing JavaScript code and embedding it in the HTML page, You can achieve the effect of showing and hiding an element. The specific method is as follows:

First, you need to create an element in the HTML page, such as the following code snippet:

<div id="myDiv">这是一个div元素</div>

Then, when using JavaScript, you can manipulate the HTML DOM Modify the element's s attribute (for example, set its style to "display:none;" or "display:block;") to display or hide it.

The following is a simple JavaScript function that reverses the display state of an element:

function toggleDivVisibility() {
  var myDiv = document.getElementById("myDiv");
  if (myDiv.style.display === "none") {
    myDiv.style.display = "block";
  } else {
    myDiv.style.display ="none";
  }
}

The function first obtains an element through the getElementById() method, and then sets its style to display or hide.

2. Using CSS
   There is a "visibility" attribute in CSS, which can control the visibility of elements. Different from the above method, when using the CSS method, two different classes need to be defined in HTML to represent the display and hidden states respectively. For example:

.hide {
  visibility: hidden;
}
.show {
  visibility: visible;
}

Then, in the HTML page, you need to specify the class of an element to control its display state, for example:

<div id="myDiv" class="hide">我要被隐藏</div>

Now, we don’t need to use JavaScript, just You need to modify the CSS class to switch the display state of the element. The specific implementation method is as follows:

document.getElementById("myDiv").classList.toggle("hide");
document.getElementById("myDiv").classList.toggle("show");

classList.toggle() method is very convenient, and can be displayed or hidden by switching the class name.

3. Using jQuery
   jQuery is a popular JavaScript library that can easily achieve DOM manipulation effects. To use jQuery to control the visibility of elements, you first need to introduce the jQuery library into the HTML page. For example:

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>

Then, we can use the following code to display and hide elements:

$("#myDiv").toggle();

This function will automatically determine the current state of the element and switch its display or hiding.

4. Using Frameworks
   A framework is a set of libraries and tools for developing web applications. Especially in single-page applications, the ability to show/hide elements is already implemented in the framework without having to write code yourself. Common frameworks include Angular, React, Vue, etc.

For example, in React, a developer can create a component that contains a button. When the button is clicked, the component re-renders to show/hide the specified element.

The following is a code example for a React component:

import React, {useState} from 'react';

function ShowHide() {
  const [show, setShow] = useState(false);

  return (
    <>
      <button onClick={() => setShow(!show)}>切换显示/隐藏</button>
      {show && <div>这是显示的元素。</div>}
    </>
  );
}

Note that the useState() function is one of the hook functions used to declare state in React. By clicking the button, it toggles the state of the show variable and re-renders the component, in the above code, making the specified element show or hide.

Conclusion

No matter which method you choose, you need to implement the function of showing/hiding an element in developing web pages. Mastering this technology can make a website more user-friendly and flexible, making it easier to use and adapt to different scenarios.

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