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How To Display Selected File Names Before Uploading Multiple Files In Struts2

Uploading multiple files can be a common requirement in web applications, and when developing with Struts2, displaying the selected file names before uploading them can provide a better user experience. In this guide, we will walk you through how to achieve this functionality in your Struts2 application.

Firstly, you will need to create a form in your JSP page to allow users to select multiple files for uploading. You can use the `` tag provided by Struts2 to create file upload fields. Make sure to set the `multiple` attribute to allow selecting more than one file.

Next, you will need to add some JavaScript code to dynamically display the names of the selected files. When a user selects files using the file input field, you can capture the file names and display them in a readable format on the page.

To achieve this, you can use the `onchange` event of the file input field to trigger a JavaScript function. Within this function, you can access the selected files using the `files` property of the file input element. Iterate over the selected files and extract their names.

Here's an example of how you can implement this in your Struts2 application:

Html

<s>
    <div id="selectedFiles"></div>



function displaySelectedFileNames(input) {
    var selectedFiles = input.files;
    var filesList = document.getElementById('selectedFiles');
    filesList.innerHTML = '';

    for (var i = 0; i &lt; selectedFiles.length; i++) {
        var file = selectedFiles[i];
        var fileName = document.createElement(&#039;p&#039;);
        fileName.textContent = file.name;
        filesList.appendChild(fileName);
    }
}

In this code snippet, we have added a `

` element with the id `selectedFiles` where we will display the selected file names. The `displaySelectedFileNames` function is called whenever the user selects files using the file input field. It iterates over the selected files, creates a `

` element for each file name, and appends it to the `selectedFiles` div.

By implementing this approach, users will be able to see the names of the files they have selected for upload before actually uploading them. This can help prevent any accidental selections and provide feedback to the user about their chosen files.

Remember, always ensure that your server-side code is able to handle multiple file uploads securely and efficiently. You may need to adjust your action class in Struts2 to process multiple files appropriately.

In summary, by combining Struts2 with JavaScript, you can create a more user-friendly file upload experience by displaying selected file names before uploading multiple files. This small enhancement can greatly improve the usability of your web application.

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