Can jquery only be written in HTML?

jQuery is a popular Javascript library that can help websites or applications achieve dynamic effects and interactive functions. Compared with native Javascript, jQuery syntax is simpler and easier to understand, and there are many ready-made plug-ins available. Many people who have just started learning jQuery will think that jQuery can only be written in HTML. This view is wrong.

In fact, the code of jQuery can be written in a file with Javascript functions, such as a JavaScript file or a PHP file, not just an HTML file. No matter which file you write the jQuery code in, you need to ensure that the jQuery file or library is imported in the corresponding page.

Practical scenarios for writing jQuery code in Javascript files include the following situations:

1. Implement separate Javascript files, such as .js files.

In this case, the developer needs to add a reference to the jQuery file to the HTML file and add the following line of code at the top of the Javascript file to ensure that the jQuery file is loaded before the Javascript code:

<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<script src="app.js"></script>

In Javascript files, you can use jQuery syntax to achieve dynamic effects and functions, for example:

$(document).ready(function(){

    // 点击按钮时隐藏和显示div元素
    $('button').click(function(){
        $('div').toggle();
    });
});

In this example, we use the ready() function provided by jQuery to ensure that the document is loaded Execute the JavaScript code after completion. We also use the click() function to add an event listener that will toggle the visibility of the div element when we click the button.

2. Writing jQuery code in a PHP file

In a PHP file, developers can add jQuery code snippets to the PHP code, for example:

<?php
    // PHP代码段
?>
<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<script>
    // jQuery代码段
    $(document).ready(function(){
        // 在文档加载完成时执行
        $('button').click(function(){
            $('div').toggle();
        });
    });
</script>
<?php
    // PHP代码段继续
?>

In this example, we add the jQuery code snippet to the PHP file so that it can work with the PHP code. This ensures that the jQuery file is loaded correctly before our Javascript code can execute.

The benefit of writing jQuery code in a PHP file is that Javascript code can be generated based on specific dynamic situations without reloading the HTML page. For example, you can use Ajax requests to get data and pass it to a jQuery function to generate the HTML content of the response.

3. Writing jQuery code in ASP files

In ASP files, developers can write jQuery code using a similar method to that in PHP files. For example:

<%
&#39; ASP代码段
%>
<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<script>
    // jQuery代码段
    $(document).ready(function(){
        // 在文档加载完成时执行
        $('button').click(function(){
            $('div').toggle();
        });
    });
</script>
<%
&#39; ASP代码段继续
%>

Here we use a similar method to the PHP file to embed the jQuery code block into the ASP code block. Doing this helps ensure that the jQuery file is loaded correctly before our Javascript code can execute and dynamically generate the corresponding page content if necessary.

In the above three cases, developers need to follow the same jQuery syntax and document structure to ensure that jQuery is implemented correctly. At the same time, you also need to ensure that each page correctly references the jQuery file or library, and that the file has been loaded correctly before executing the jQuery code.

Summary

In summary, jQuery is not limited to use in HTML files. It can be used in Javascript, PHP, ASP and other file types. When writing jQuery code in these files, developers need to ensure that the jQuery files are referenced correctly, the files are in the correct order, and each page loads correctly. Doing this ensures that the jQuery code runs correctly and smoothly.

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