css div show hide div

CSS is a very important technology in web design and development, where showing and hiding elements are common tasks in CSS. In this article, we will introduce how to use CSS to show and hide DIV elements.

In CSS, you can use the display attribute to control the display and hiding of elements. The display attribute can be set to the following values:

• none (hide the element)
• block (display the element as a block element)
• inline (display the element as inline inline-block (displays elements as inline-block elements)
• The following code example demonstrates how to use the display attribute to hide and show DIV elements:

.hide {
  display: none;
}

.show {
  display: block;
}

The .hide class in the example sets the element display to none, which will cause the element to be hidden. Instead, the .show class sets the element to block, which causes the element to be displayed.

Next, let’s take a look at how to dynamically show and hide DIV elements through JavaScript.

First, we can use the getElementById method to get the reference of the element to be displayed or hidden, and then set the style display property of the element to none or block to hide or display it:

//隐藏元素
var element = document.getElementById("element-id");
element.style.display = "none";

//显示元素
element.style.display = "block";

However, there are some drawbacks to manually controlling the visibility of elements by using JavaScript. First, it requires relatively verbose code and requires explicit handling of element state, which makes the code difficult to maintain. Second, in large websites, dynamically switching the styles of page elements may cause browser performance to degrade.

Therefore, we can use CSS’s :focus pseudo-class to achieve some dynamic element display and hiding effects. When the user clicks on an element, the element can gain focus and apply CSS styles in the :focus state.

For example, in the code below, we define a :focus style for the element that will appear when the user clicks on the element. When the user clicks on another element on the page outside of focus, the element will be hidden again:

.element:focus {
  display: block;
}

.element {
  display: none;
}

When we use the :focus pseudo-class, we don't need to use JavaScript to manage the logic and can do it using just CSS Dynamic elements hide and show. This also makes our code clearer and easier to maintain.

Finally, there is a way to control the display and hiding of elements using CSS and JavaScript, which is based on the HTML checkbox element. When the checkbox is selected, the related elements will be displayed. Otherwise, the element is hidden.

The key to implementing this method is to use CSS’s :checked pseudo-class, which is activated when the element associated with :checked is selected. To achieve this effect, we need to add some CSS rules between the element and the associated checkbox.

The following code demonstrates how to use checkboxes to display and hide elements:

<input type="checkbox" id="checkbox-id">
<label for="checkbox-id">显示隐藏元素</label>
<div class="element">隐藏的元素</div>

/* 隐藏元素 */
.element {
  display: none;
}

/* 复选框被选中时显示元素 */
#checkbox-id:checked ~ .element {
  display: block;
}

In this example, we use a checkbox and an associated label. When the user clicks The checkbox will be selected when labeling. When the checkbox is selected, the .element element's display style will be set to block and the element will be displayed.

To summarize, by using the display attribute of CSS, we can display and hide elements in web design. In some cases, we can use JavaScript or the :focus pseudo-class to achieve dynamic effects, and using checkboxes is another way to achieve this effect. We can choose the method that best suits us based on actual needs.

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