How to click color to change color in css

CSS is a commonly used front-end development language. CSS can be used to beautify pages, change the style of elements, and increase user experience. Among them, changing the color of elements through click events is a common operation technique. Let’s introduce in detail how to implement this function.

1. Basic knowledge

Before you can click on the color to change the color, you need to understand the basic knowledge of CSS. CSS, short for Cascading Style Sheets, is a style language used to define the appearance and style of HTML documents. CSS can control the color, size, font and other attributes of text, as well as the size and position of elements.

In CSS, you can select elements in the following ways:

1. Element selector: Select elements by element name, such as p, div, a, etc.
2. ID selector: Select elements by element ID, such as #elementId. One ID can only correspond to one element.
3. Class selector: Select elements by element class name, such as .className. A class name can correspond to multiple elements.
4. Attribute selector: Select elements through element attributes, such as [type="text"].
5. Pseudo-class selector: Select elements through element status, such as :hover, :active, etc.
6. Combined selectors: Select elements through a combination of multiple selectors, such as p.active, #elementId.className, etc.

2. CSS to realize clicking on the color to change the color

Now that we have mastered the basic CSS knowledge, we can start to realize the function of clicking on the color to change the color.

1. HTML code

First, you need to set elements in HTML. Here we take a div element as an example. The code is as follows:

Here, we set a class as "color-change" div element and set a text "Click to change color".

2. CSS Style

Next, we need to use CSS style to realize the function of clicking the element to change the color.

First, add a color attribute to the div element. The code is as follows:

.color-change {
background-color: blue;
color: #fff;
padding: 10px;
cursor: pointer;
}

Here, we set the background color of the div element to blue, the text color to white, the text margin to 10px, and the cursor type to hand.

Next, add a click event handler to the div element. The code is as follows:

.color-change:active {
background-color: red;
}

Here, we use the pseudo-class selector: active to represent the div element The state when clicked. When the div element is active, its background color is changed to red.

3. JavaScript code

Finally, you need to add a click event handler to the div element. The code is as follows:

document.querySelector('.color-change').addEventListener('click', function() {
this.style.backgroundColor = '#ff0';
}) ;

Here, we use the querySelector method to get the div element with class "color-change", and then add a click event listener to it. When the div element is clicked, the specified callback function will be executed and its background color will be changed to yellow.

Summary

Through the above steps, we can implement a function that changes the color of an element after clicking on it. This technique can be applied in many areas, such as changing button color, changing text box color, etc. It should be noted that when implementing this function, attention should be paid to the maintainability and compatibility of the code, and try to avoid compatibility issues and code redundancy.

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