Trigger javascript after FileResult return in ASP mvc

Question

I have a Javascript call:

window.location.replace(instanceExtension(baseURL + "/AccountsReceivable/PrintStatementOfAccount?clientId=" + clientId, -1));

And the PrintStatementOfAccount() method takes a few seconds so I've added a mask to the page indicating that the PrintStatement is loading.

The ASP method is defined as:

public FileResult PrintStatementOfAccount(long clientId) { ... }

All works great, but I would like to disable the wait mask once the file returns. Any ideas on how I can achieve this?

dev · Accepted Answer · 2011-11-03 22:50:15Z

1

You can pass token to the method and check for that token in the javascript.

var token = new Date().getTime();
$('#download_token_valueid').val(token); 
$.download(path + "Print.ashx", 'Id=' + id + "&token=" + token);    

fileDownloadCheckTimer = window.setInterval(function () {
        var cookieValue = $.cookie('fileDownloadToken');
        if (cookieValue == token)
            finishDownload();
    }, 1000);

function finishDownload() {
    window.clearInterval(fileDownloadCheckTimer);
    $.cookie('fileDownloadToken', null); //clears the cookie value
    $.unblockUI();
}

answered Nov 3, 2011 at 22:50

dev

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1 Comment

Mark Kadlec Over a year ago

Thanks for the suggestion dotnet, I would rather avoid polling for the status though, wish there was another way...

Vasile Tomoiaga · Accepted Answer · 2012-03-23 08:19:11Z

1

You cannot know from JavaScript whether the file is returned to the browser.

As a workaround instead of returning the file directly you split the process:

File is ready for download: reload the same page with a parameter that somehow identifies the file.
On reloading you read that parameter and save it in a javascript value. Here you can hide the wait mask.
In the page you check if the javascript file identifier is not null, and if not you make a GET request to the server for the file with javascript window.location='url_to_get_file'.

answered Mar 23, 2012 at 8:19

Vasile Tomoiaga

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