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How to use jQuery in PHP programming?

王林

Jun 12, 2023 am 11:40 AM

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With the development of Web technology, PHP, as a server-side programming language, is widely used in Web application development. As a popular JavaScript framework, jQuery is also widely used in Web front-end technology. In Web development, the combination of PHP and jQuery can realize more complex and rich Web applications. This article will introduce how to use jQuery in PHP programming.

1. Import jQuery library

Before using jQuery, you need to import the jQuery library into the project. You can download the jQuery library and link it into the HTML file, or you can use a CDN to load the jQuery library.

Download the jQuery library

First you need to download it from the jQuery official website (https://jquery.com). Select the appropriate version to download based on project needs, and then save it to the project path.

Link jQuery library

Link the downloaded jQuery library to the project in the HTML code. You can use the following code in the head tag:

<head>
  <script src="path/to/jquery.min.js"></script>
</head>

You can replace path/to/jquery.min.js with the path where the jQuery library is located.

You can also use CDN to link to the jQuery library. As shown below:

<head>
  <script src="https://cdn.jsdelivr.net/jquery/3.6.0/jquery.min.js"></script>
</head>

This will link directly to the latest jQuery library through the CDN.

2. Basic syntax for using jQuery

jQuery uses the $ symbol as its object, through which operations such as HTML document traversal, event processing, and dynamic updating can be performed. The basic syntax of jQuery will be introduced below.

Selector

jQuery’s selector uses the same syntax as CSS selector. You can select HTML elements through the selector, such as:

//选取所有p元素
$("p")

//选取所有class为intro的元素
$(".intro")

//选取id为intro的元素
$("#intro")

//选取所有a元素的href属性值以“.pdf”结尾的元素
$("a[href$='.pdf']")

Event processing

You can interact with HTML elements by binding events, such as:

//点击按钮触发事件
$("#btn").click(function(){
  alert("Hello, World!")
})

Dynamic update

HTML elements can be dynamically updated through jQuery methods, such as:

//在id为div1的元素中添加一条内容为"Hello, World!"的p元素
$("#div1").append("<p>Hello, World!</p>")

//在id为div1的元素中移除最后一个p元素
$("#div1").children("p:last").remove()

//修改id为div1的元素中所有p元素的样式
$("#div1").children("p").css("color", "red")

3. Using jQuery in PHP

To use jQuery in PHP, you need to embed the jQuery code into the PHP code and pass PHP output to HTML file. Here's how to use jQuery in PHP.

Use PHP code in HTML

You can embed PHP code in HTML files and generate HTML code through PHP, such as:

<!DOCTYPE html>
<html>
<head>
  <title>PHP与jQuery的结合使用</title>
  <script src="https://cdn.jsdelivr.net/jquery/3.6.0/jquery.min.js"></script>
</head>
<body>
  <?php
    //使用PHP生成HTML代码
    $name = "World";
    echo "<h1 id="Hello-name">Hello, $name!</h1>";
  ?>
</body>
</html>

Yes Use the echo function to output the generated HTML code to an HTML file.

The basic syntax of using jQuery in PHP

The basic syntax of using jQuery in PHP is the same as using it in an ordinary HTML file. You only need to embed the jQuery code in PHP code, and output it to an HTML file through PHP, such as:

<!DOCTYPE html>
<html>
<head>
  <title>PHP与jQuery的结合使用</title>
  <script src="https://cdn.jsdelivr.net/jquery/3.6.0/jquery.min.js"></script>
</head>
<body>
  <?php
    //使用PHP生成HTML代码
    echo "<p>Click the button to change the text of this paragraph:</p>";
    echo "<button id='btn'>Click me</button>";
    echo "<p id='p'>Hello, World!</p>";

    //使用jQuery处理事件和动态更新元素
    echo "<script>";
    echo "$('#btn').click(function(){";
    echo "$('#p').text('Hello, jQuery!')";
    echo "});";
    echo "</script>";
  ?>
</body>
</html>

Use PHP's echo function to output the jQuery code into an HTML file to achieve event processing and dynamic updating of HTML elements.

4. Summary

This article introduces how to use jQuery in PHP programming, and demonstrates the basic usage through sample code. The combination of PHP and jQuery can help developers develop complex and dynamic web applications more conveniently, improving the efficiency and reliability of web development. In actual development, developers can also implement richer and cooler web applications by deeply learning the advanced features of jQuery.

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