Retrieve image data in its original format using AJAX

Currently, I am working on integrating Facebook with a website and I encountered a specific call in the Facebook API that posts a picture to a user's account. One of the parameters required is the raw image data. The image is stored locally on the web server and I have a URL for it. Initially, I tried to load the image on the client side using JavaScript, but I learned that it's not possible. So, I am now attempting to make an httpxml call to the server with the image URL in order to retrieve the image data. The code example I have works with a URL to a CSV file, but I am facing issues when trying to read the contents of the image files. When I try to access xmlhttp.responseText, I encounter an error. The API call I am trying to use this image data for is:

function getFile(pURL,pFunc) {
        xmlhttp=new ActiveXObject('Microsoft.XMLHTTP'); 
        if (xmlhttp) {
            eval('xmlhttp.onreadystatechange='+pFunc+';');
            xmlhttp.open('GET', pURL, false);
            xmlhttp.send();
        }
}

function makeList() {
    if (xmlhttp.readyState==4) { 
        if (xmlhttp.status==200) { 
            var tmpArr=xmlhttp.responseText;
            document.getElementById('theExample').innerHTML=tmpArr;
        }
    }
}

I apologize for my lack of understanding in these web technologies. I am eager to learn, but I need to complete this task quickly before delving into the intricacies of web development. I have been entrenched in the world of C#/C++ for quite some time.

javascriptajaxfacebookxmlhttprequest

Answer №1

Are you currently creating a Facebook application, utilizing the Facebook API, and attempting to upload an image from your app to a user's profile?

The API necessitates an HTTP post with multi-part MIME - this could be what's causing confusion.

If you're using a client library, I'm assuming you're utilizing:

This PHP resource provides the fundamental information you might need:

One issue I noticed in your code is that you're attempting to retrieve the image from a URL into responseText (a string) when you actually need responseBody (binary) instead. http://msdn.microsoft.com/en-us/library/ms535874(VS.85).aspx

Answer №2

Why not simply generate an image element if you are aware of the URL of the image stored on the server?

var image = document.createElement("img");
image.src = url; // assuming that the URL is stored in a variable named "url"
document.getElementById("image_container").appendChild(image);

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