javascript hide show

JavaScript is often used in web development to achieve interactive effects, one of which is hiding and showing elements. In this article, I will teach you how to hide and show elements using JavaScript.

1. Use JavaScript to hide elements

The easiest way to use JavaScript to hide an element is to operate the style attribute of the element.

First, we need to get the elements that need to be hidden. You can use the document.getElementById() method to get the element with a specified id, or you can use the document.querySelector() method to get the first element matched by the CSS selector. For example:

// 获取元素
var ele = document.getElementById("myElement");
// 或者
var ele = document.querySelector(".myClass");

Next, we can hide it by setting the display attribute of the element's style attribute to none. For example:

ele.style.display = "none";

In this way, we can achieve the effect of hiding elements.

2. Use JavaScript to display elements

Similarly, using JavaScript to display an element is also very simple. Just set the element's display attribute to its default value. Generally speaking, the default display attribute value of an element is block, but it may also be other values ​​(such as inline).

Before displaying elements, we need to obtain the elements that need to be displayed. Similarly, you can use the document.getElementById() or document.querySelector() method to get the specified element.

// 获取元素
var ele = document.getElementById("myElement");
// 或者
var ele = document.querySelector(".myClass");

Next, we can display it by setting the display attribute of the element's style attribute to its default value. For example:

ele.style.display = "block";

3. Use JavaScript to switch between hiding and showing elements

Now, we have learned how to use JavaScript to hide and show elements. However, sometimes we need to switch the display state of an element. For example, we place a button on the page, and clicking the button can switch the display state of an element.

In this case, we can use the following code to switch the display state of the element:

var ele = document.getElementById("myElement"); // 获取元素
if (ele.style.display === "none") { // 判断元素是否被隐藏
   ele.style.display = "block"; // 如果被隐藏，则显示元素
} else {
   ele.style.display = "none"; // 如果正在显示中，则隐藏元素
}

This code first obtains the specified element and checks its current display attribute value Whether it is none. If it is, set its display property to block to make it visible; if not, set its display property to none to make it hidden.

Now, we only need to add a click event listener to the button and call the above code to achieve the effect of switching the display state of the element.

In page development, we often use JavaScript to hide and show elements to achieve better user interaction. Through the introduction in this article, we not only learned how to hide and show elements, but also learned how to switch the display state of elements in JavaScript.

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