Alex Man Alex Man - 6 months ago 1377
AngularJS Question

AngularJS $http-post - convert binary to excel file and download

I've created an application in Angular JS for downloading an Excel workbook through $http post.

In the below code I'm passing the information in the form of JSON , and send it to the server REST web service (java) through an angular $http post. The web service uses the information from the JSON and produces an Excel workbook. In the response within the success body of $http post, I'm getting binary data within that data variable, but don't know how to convert it and download as an Excel file.

Can anyone please tell me some solution for this for converting the binary to Excel file and download?

My code is as given below:

$http({
url: 'myweb.com/myrestService',
method: "POST",
data: json, //this is your json data string
headers: {
'Content-type': 'application/json'
}
}).success(function (data, status, headers, config) {

// Here i'm getting excel sheet binary datas in 'data'

}).error(function (data, status, headers, config) {

});

Answer

Just noticed you can't use it because of IE8/9 but I'll push submit anyway... maybe someone finds it useful

This can actually be done through the browser, using blob. Notice the responseType and the code in the success promise.

$http({
    url: 'your/webservice',
    method: "POST",
    data: json, //this is your json data string
    headers: {
       'Content-type': 'application/json'
    },
    responseType: 'arraybuffer'
}).success(function (data, status, headers, config) {
    var blob = new Blob([data], {type: "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"});
    var objectUrl = URL.createObjectURL(blob);
    window.open(objectUrl);
}).error(function (data, status, headers, config) {
    //upload failed
});

There are some problems with it though like:

  1. It doesn't support IE 8 and 9:
  2. It opens a pop up window to open the objectUrl which people might have blocked
  3. Generates weird filenames

It did work!

blob The server side code in PHP I tested this with looks like this. I'm sure you can set similar headers in Java:

$file = "file.xlsx";
header('Content-disposition: attachment; filename='.$file);
header('Content-Length: ' . filesize($file));
header('Content-Transfer-Encoding: binary');
header('Cache-Control: must-revalidate');
header('Pragma: public');
echo json_encode(readfile($file));

Edit 20.04.2016

Browsers are making it harder to save data this way. One good option is to use filesaver.js. It provides a cross browser implementation for saveAs, and it should replace some of the code in the success promise above.