How to call methods (functions) in js in php-PHP Problem-php.cn

How to call methods (functions) in js in php

PHPz

Release： 2023-04-26 13:48:03

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PHP is an extremely powerful server-side scripting language, while JavaScript is an extremely flexible client-side scripting language. The combination of the two can make website development more efficient and easier to manage. In practical applications, we often need to call some methods or functions in JavaScript in PHP code, which requires us to use some techniques to achieve this. This article will introduce how to call methods (functions) in JavaScript in PHP.

1. Call methods (functions) in JavaScript

PHP itself is a server-side scripting language. The code fragments executed on the server side and the code executed on the user browser side in JavaScript are A big difference. So if we want to call JavaScript functions in PHP, we need to use some middleware to achieve it.

1. Implemented through HTML script tags

We can call JavaScript functions by defining JavaScript functions in script tags and then outputting this tag in PHP. The sample code is as follows:

<?php
//PHP代码片段
?>

<html>
    <head>
        <script>
            function test(){
                alert('Hello World!');
            }
        </script>
    </head>
    <body>
        <?php
            //PHP代码片段
            echo "<script>test();</script>";
        ?>
    </body>
</html>

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In the above code, we define a JavaScript function named "test" in the script tag, and output a script tag that calls this function in the PHP code snippet. When a user visits this page, the browser will first execute the PHP code snippet, and then execute the JavaScript function in the script tag, thereby achieving the effect of PHP calling the JavaScript function.

2. Implementation through AJAX request

We can also implement PHP calling JavaScript functions through AJAX request. The advantage of this method is that it can make asynchronous requests and update the page content without refreshing the entire page.

The sample code is as follows:

<?php
//PHP代码片段
?>

<html>
    <head>
        <script>
            function test(){
                alert('Hello World!');
            }
        </script>
        <script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
    </head>
    <body>
        <?php
            //PHP代码片段
            echo "<button onclick=\"$.get(&#39;test.php&#39;,{},function(){test()})\">点击调用JavaScript函数</button>";
        ?>
    </body>
</html>

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In the above code, we output a button in the PHP code snippet. When the user clicks this button, an empty { is sent to test.php through an AJAX request. } request, the server returns the result and then executes the JavaScript test() function to pop up the "Hello World!" message box.

2. Summary

In practical applications, we often need to call JavaScript functions in PHP. This can be achieved through script tags or AJAX requests. We need to consider how to implement PHP to call JavaScript functions in two situations: 1. Need to update the page content without refreshing the entire page; 2. Need to interact with the user and execute some code on the client side.

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