Let's talk about the problem and solution of JS files failing to load in ThinkPHP

In the process of web development, JavaScript (hereinafter referred to as JS) is often used for page interaction, and using ThinkPHP in the PHP framework, there are many convenient methods to easily reference JS files. However, sometimes we encounter the problem that JS cannot be loaded, which brings certain troubles to our development work. This article will introduce the problem of JS files failing to load when using ThinkPHP and its solution.

Problem description

When developing using the ThinkPHP framework, we usually place the JS file in the js folder in the public directory and use the following statement to reference the JS file:

<script src="__PUBLIC__/js/example.js"></script>

Among them, __PUBLIC__ is a built-in constant in ThinkPHP, pointing to the path to the public directory. There seems to be no problem in referencing the JS file in this way, but sometimes we find that the JS file is not loaded, causing the page interaction to fail to proceed normally.

Solution

1. Check the JS file path

First, we need to check whether the path pointed to by __PUBLIC__ is correct. We can enter the following path in the browser address bar to check whether the JS file can be accessed normally:

http://yourdomain.com/js/example.js

If it can be accessed normally, the path is set correctly. Otherwise, we need to check whether the path setting is correct and make sure that the actual path of the file matches the path we set.

2. Modify the JS file reference path

If the JS file exists in the path we set but still cannot be loaded, then we need to consider ways to modify the reference path. Sometimes, using relative paths may cause the JS file to not be loaded correctly, so we can try to use absolute paths for reference.

Assuming that our application is installed under the path http://yourdomain.com/yourapp/, we can use the following statement to reference the JS file:

<script src="/yourapp/public/js/example.js"></script>

The path starts with a slash /, which indicates an absolute path and points to the public/js directory in the root directory of the entire website.

3. Modify the Apache configuration file

If the above two methods still cannot solve the problem of being unable to load the JS file, then we can try to modify the configuration file of the Apache server. We need to open the Apache configuration file httpd.conf and find the following statement:

<Directory />
    Options FollowSymLinks
    AllowOverride None
    Require all denied
</Directory>

Among them, AllowOverride None means that the instructions in the .htaccess file are not allowed to override the main configuration. instructions in the file. In the ThinkPHP framework, we usually use .htaccess files to rewrite URLs, so AllowOverride needs to be set to All. The modified statement is as follows:

<Directory />
    Options FollowSymLinks
    AllowOverride All
    Require all denied
</Directory>

After modification, we need to restart the Apache server.

Conclusion

Through the above solutions, we can easily solve the problem that JS cannot be loaded when using the ThinkPHP framework. In the process of fixing the problem, we can not only understand the impact of reference paths and server configuration on JS file loading, but also deepen our understanding of the ThinkPHP framework.

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