Why Should Your JavaScript Scripts Be Included in index.html in jQuery Mobile Projects?-JS Tutorial-php.cn

Why Should Your JavaScript Scripts Be Included in index.html in jQuery Mobile Projects?

Mary-Kate Olsen

Release： 2024-11-11 22:19:02

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Why Should Your JavaScript Scripts Be Included in index.html in jQuery Mobile Projects?

Why Your Scripts Need to Reside in index.html in jQuery Mobile

In jQuery Mobile projects, you may encounter confusion when redirecting between pages using $.mobile.changepage. Unexpectedly, scripts from the redirected page fail to execute, leaving you clueless.

Understanding jQuery Mobile's Page Handling

To understand this situation, it's crucial to grasp jQuery Mobile's page handling mechanism. It utilizes AJAX to load subsequent pages. While the first page is loaded conventionally, subsequent ones only receive their BODY content (specifically, the first DIV with a data-role="page" attribute), while the HEAD content is disregarded.

This means that scripts defined in the BODY content of the redirected page will not execute. The reason is that their parent HEAD, which contains necessary libraries, is not loaded during the page transition.

Solution 1: Include Scripts in the Body

To resolve this issue, move the SCRIPT tag for the redirected page into its BODY content:

<body>
    <div data-role="page">
        // Other HTML content
        <script>
            // Javascript code
        </script>
    </div>
</body>

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Although this solution works, it can potentially clutter the HTML with multiple SCRIPT tags.

Solution 2: Consolidate Scripts in index.html

A better approach is to centralize all JavaScript logic in index.html by including it in a separate JS file in the HEAD:

<head>
    <meta name="viewport" ...>
    <link rel="stylesheet" href="jquery.mobile-1.2.0.min.css">
    <script src="jquery.mobile-1.2.0.min.js"></script>    
    <script src="index.js"></script> // Custom JS file
</head>

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Why index.html Is Paramount

While Solution 2 consolidates scripts, it remains crucial to include them in index.html. This is primarily due to the buggy nature of Phonegap. In the event of an error, Phonegap may refresh the current page, losing its DOM. Any JavaScript code that is not present in the HEAD of the refreshed page will not execute.

By centralizing scripts in index.html, the necessary libraries are always loaded in the HEAD, ensuring uninterrupted functionality even after potential Phonegap errors.

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