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Display and hide html div

WBOYOriginal: 2023-05-09 09:30:364111browse

HTML div is a common web page layout element, which can be used to divide pages and group content. Sometimes, we want to dynamically control the display and hiding of divs based on user interaction or other conditions. At this time, we need to understand how to use JavaScript and CSS to display and hide divs.

Use CSS to display and hide divs

The simplest way to use CSS to display and hide divs is to apply the display attribute. The display attribute refers to the display mode of the element. It has multiple values, such as block, inline, inline-block, none, etc. Among them, the value of none will make the element disappear completely, while other values will make the element appear.

In the following code, we define a div element with the id myDiv and set its display attribute to none. This means that initially, the div element is invisible. Next, we set the display attribute of myDiv to block through JavaScript to display it.

<!DOCTYPE html>
<html>
  <head>
    <style>
      #myDiv {
        display: none;
      }
    </style>
  </head>
  <body>
    <div id="myDiv">这是一个隐藏的div元素</div>
    <button onclick="showDiv()">显示div</button>
    <script>
      function showDiv() {
        document.getElementById("myDiv").style.display = "block";
      }
    </script>
  </body>
</html>

In this example, we obtain the div element with the id myDiv through JavaScript's getElementById method, and set its display attribute to block to display it. When the user clicks the "Show div" button, the showDiv function will be called to display and hide the div.

Use JavaScript to display and hide divs

In addition to using the display attribute of CSS to control the display and hiding of divs, we can also implement it through JavaScript. In this case, we need to use JavaScript's style.display property to control the display state of the div.

In the following example, we define a div element with the id div1 and set its initial state to invisible. Then, we get the element through JavaScript's getElementById method and set its style.display property to block to display it. When the user clicks the button again, we set the style.display property of div1 to none to hide it.

<!DOCTYPE html>
<html>
  <head>
    <script>
      function showHide() {
        var div = document.getElementById("div1");
        if (div.style.display === "none") {
          div.style.display = "block";
        } else {
          div.style.display = "none";
        }
      }
    </script>
  </head>
  <body>
    <button onclick="showHide()">显示/隐藏div</button>
    <div id="div1" style="display: none">这是一个隐藏的div元素</div>
  </body>
</html>

In this example, we display and hide divs by defining a showHide function. When the user clicks the "Show/Hide div" button, the showHide function will be called. In the function, we first obtain the div element with the id div1 through the getElementById method, and then determine the value of its style.display attribute. If it is none, set it to block and display it. Otherwise, we set it to none, thus hiding it.

Summary

HTML div is a common web page layout element. You can easily display and hide divs using JavaScript and CSS. By applying the display attribute and style.display attribute, we can control the display state of the div element to dynamically show or hide content as needed. This function plays a great role in designing dynamic web pages, interactive applications, etc., and an in-depth understanding of its implementation is very important for web development engineers.

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