How to Download Files from ASP.NET Web API using AngularJS?

Download File from ASP.NET Web API using AngularJS

Introduction

Integrating file downloads from web services into AngularJS applications can pose challenges due to browser limitations. This article explores a range of methods for handling binary file downloads in AngularJS.

Simple Download Method

For basic file downloads, you can simply trigger a GET request using a browser-supported file path:

$scope.downloadFile = function(downloadPath) {
    window.open(downloadPath, '_blank', '');
}

Ajax Binary Download Method

To perform binary file downloads via Ajax, you can use this script in browsers like Chrome, Internet Explorer, Firefox, and Safari. Note that navigator.msSaveBlob only works separately in Internet Explorer 11.

$scope.downloadFile = function(httpPath) {
    // ... (Code omitted for brevity) ...
    try {
        // ... (Code omitted for brevity) ...
        if (navigator.msSaveBlob)
            navigator.msSaveBlob(blob, filename);
        else {
            // ... (Code omitted for brevity) ...
        }
    } catch (ex) {
        // ... (Code omitted for brevity) ...
    }

    if (!success) {
        // ... (Code omitted for brevity) ...
    }
}

Usage:

var downloadPath = "/files/sample.pdf";
$scope.downloadFile(downloadPath);

Required Web API Response Headers

To ensure proper file download, your Web API method should return the following headers:

• x-filename: Custom header containing the filename.
• content-type: Mime header specifying the file format.

Conclusion

This article provides several approaches for managing file downloads from Web API services within AngularJS applications. Based on the specific browser capabilities and requirements of your project, choose the method that best fits your needs.

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