Download files with javascript

However, the problem is that because the download takes place inside our application, the user may think that nothing happened when he clicked and therefore it is up to us to manage large file downloads by implementing the measurement of progress. At the same time, this method is useful when we need to perform certain actions inside our application once the file has completed downloaded.

Show a message, send a request to the back-end render a new page, and so on…. The beginning and the onreadystatechange block is similar to the second function. Download the response as a Blob object, create a DOMString, and use an anchor element to download the file. Inside onprogress we use e.

Notice in the GIF above that we have the same behavior as for the second method, only now we can monitor progress.

After the file is completely downloaded, it will be sent to the browser and then it will be instantly saved to disk. Each of the above methods represents an update over the previous method. The first method is the easiest. In this, we simply forward the download process to the browser to manage it natively.

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Question feed. Stack Overflow works best with JavaScript enabled. A Blob object is a file-like object used to represent raw immutable data. Blob objects contain information about the type and size of data they store, making them very useful for storing dynamic contents in the browser.

This method is helpful to create an object URL that represents a blob or a file. The browser will release all object URLs when the document is closed or reloaded. However, it is a good practice to release object URLs whenever they are no longer required to improve performance and minimize memory usage.

This forces the anchor element to trigger a file download when it is clicked. You should now see the file you recently downloaded with a date and time. The download attribute specifies that the target the file specified in the href attribute will be downloaded when a user clicks on the hyperlink. The optional value of the download attribute will be the new name of the file after it is downloaded.

Steps :. Download Algorithm Create a text area to enter the text data. This will help us to replace certain special characters with a combination of escape sequences. Append this created element to the body of the document HTML page. Use element. Remove the element from the body of the document HTML page.