How can I trigger a file download from an ASP.NET page using JavaScript?
What is the most effective method to achieve this? Can I use a webservice or call the standard event handler of a C# page?
Keep in mind that I will be downloading a significant amount of data, potentially many megabytes.
If you want to create a seamless AJAX file download experience, consider using a hidden IFRAME element to handle the file download request. This way, your users can continue interacting with the form on the client side while the file is being downloaded.
Additionally, you have the flexibility to call a webservice, aspx page, or HTTP handler within the URL for the file download.
function dowloadFileJS() {
// Create an IFRAME.
var iframe = document.createElement("iframe");
// Point the IFRAME to GenerateFile
iframe.src = "GenerateFile.aspx?yourQueryString=myQueryString";
// Make the IFRAME invisible to the user.
iframe.style.display = "none";
// Add the IFRAME to the page. This triggers the request to GenerateFile immediately.
document.body.appendChild(iframe);
}
If you're looking to download a file using JavaScript, one method is by creating an iframe that points to the desired file. Check out this resource for more information: Starting file download with JavaScript
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