CODEWITHSUNDEEP
c#javascriptjqueryimage
David Fox
David Fox

Reputation: 10753

How can I use $.ajax to set image src to dynamic image/png data?

Images are generated dynamically with a handful of user input parameters. I'm able to successfully produce the image via GET, by writing to Response.OutputStream

$('#myImage').attr('src', 'Images/GetImage?param1=value1&param2=value2');

There are several additional parameters. But, how can I accomplish this with a POST? I thought I might use $.ajax and base64 encode the Image, but it doesn't quite work.

$.ajax({
    url: 'Images/GetImage64',
    type: 'POST',
    data: { param1: 'value1', param2: 'value2' },
    success: function (data) {
        //$('#myImage').attr('src', data); 
        $('#myImage').attr('src', 'data:image/png;base64, ' + data);
    }
});

Chrome dev tools shows an ajax (XHR) POST to /Images/GetImage64 with a text/plain response. The content looks like the PNG generated on the server. However, another "Other" request is made with the URL below, and I have no idea what's going on

data:image/png:base64, [binary]

On the server, I'm returning an ImageResult : ActionResult that overrides ExecuteResult and response with base64 encoded image.

public override void ExecuteResult(ControllerContext context)
{
    context.HttpContext.Response.Clear();
    context.HttpContext.Response.ContentType = "text/plain";
    context.HttpContext.Response.BinaryWrite(GetBase64Image(Image));
}

Upvotes: 2

Views: 7280

Answers (1)

Laurence
Laurence

Reputation: 1713

Might be jQuery's fault. Try forcing jQuery to treat the result as plain text with dataType: 'text':

$.ajax({
    url: 'Images/GetImage64',
    type: 'POST',
    dataType: 'text',
    data: { param1: 'value1', param2: 'value2' },
    success: function (data) {
        $('#myImage').attr('src', 'data:image/png;base64,' + data);
    }
});

Edit: Nevermind, wasn't that.

Upvotes: 1

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