Download binary data into file using javascript

Question

I want to upload and download the files using javascript.

Step 1: I converted the uploaded files to binary code and successfully able to send the binary code to server through web api.

       var SA_Supp_Evidence_Object_File = null;
        var Evidence_file_name = null;

        if (document.getElementById("file").files.length != 0) {
            SA_Supp_Evidence_Object_File = document.getElementById('file').files[0];

            var fr = new FileReader;
            fr.onloadend = function () {
                alert(fr.result);
            };
            fr.readAsBinaryString(SA_Supp_Evidence_Object_File);

            Evidence_file_name = SA_Supp_Evidence_Object_File.name;
        };

Step 2: Now i want to retrieve the same data from database and able to download by clicking the link

<td><a href="_self">Download</a></td>

Can any one help me to solve this problem

I tried like this

var data = 'data:text/plain;base64,'+L_EncodedData;
document.location = data;

Ian · Accepted Answer · 2015-11-17 13:48:17Z

2

You need to change the href attribute of the <a> to contain the data you want the user to download. You don't want to do a redirect via document.location, instead the anchor itself should contain the data.

e.g.:

var a = document.body.appendChild(
    document.createElement("a")
);
a.download = "filename.dat";
a.href = "data:text/plain;base64," + L_EncodedData;
a.innerHTML = "download";

answered Nov 17, 2015 at 13:48

Ian

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2 Comments

user5383264 Over a year ago

<a href="data:image/jpeg;base64,skjdfbsdhfbsmhdfbsmdhfvbsdvfnsdvfnsdfvsndvfnsdvfnsdvbfbnsdvbfnsd sdmfsdvbnbfbvsdnbfvsndbfvnsdbvfnsdvfnsdbfnsdbvfsndbvfnsdbvfsnd smdmfvsmndbvfnsbdvfsdnbfvsndbfvsdbnfvsbdfvsdb" download="filename.png">sdfsdfsdfs</a> Not working in IE

Ian Over a year ago

IE doesn't fully support inline data yet. en.wikipedia.org/wiki/Data_URI_scheme

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