image is downloading in chrome but not in safari

Question

In my application I'm using html2canvas for converting a HTML in to canvas and after that i'm converting that canvas to image using toDataURL() every thing fine in chrome the image is downloading soon after the page loads, but in safari the image loading in a the same page without downloading.

$(document).ready(function(e) { 
    html2canvas(document.body, {
        onrendered: function(canvas) {
        var test = document.getElementsByClassName('test');      //finding the div.test in the page
        $(test).append(canvas);                               //appending the canvas to the div
        var canvas = document.getElementsByTagName('canvas');       
        $(canvas).attr('id','test');                              //assigning an id to the canvas
        var can2 = document.getElementById("test");
        var dataURL = can2.toDataURL("image/png");
        document.getElementById("image_test").src = dataURL;     //assigning the url to the image
        $(canvas).remove();                                   //removing the canvas from the page
        download(can2,'untitled.png');
        function download(canvas_name,filename)
        {
            var tempLink = document.createElement('a');
            e; 
            tempLink.download = filename;
            tempLink.href = dataURL;
            if (document.createEvent)                            // create a "fake" click-event to trigger the download
            {
                e = document.createEvent("MouseEvents");
                e.initMouseEvent("click", true, true, window,0, 0, 0, 0, 0, false, false, false,false, 0, null);
                tempLink.dispatchEvent(e);
            }
            else if (tempLink.fireEvent)
            {
                tempLink.fireEvent("onclick");
            }
        }
        },logging:true,background: "#fff",
    });
});

Can anybody help me what i nee to change to download the file in Safari?

Answer 1

iOS limitations

The iOS there are limitations which prevent direct download (practically almost all formats), where images can be downloaded holding the "touch".

The best alternative to this would be to open an "alert" with instructions and after the alert to close call "window.open" with the image.

See the code with an alternative to "iOS"

BUG in Safari (PC and MAC - non iOS - is no problem in webkit technology, but in the browser)

I tried append anchor, create "ghost-iframe" and replace mimetype: application/download.

Download manager open, but not add file after click in "Save" or "Open".

In my opinion this is a BUG in Browser (not is an issue of Webkit, the issue is of Safari).

See code:

$(document).ready(function(e) {
    var ghostFrame = document.createElement("iframe");
    ghostFrame.name = "myFrame";
    document.body.appendChild(ghostFrame);

    html2canvas(document.body, {
        onrendered: function(canvas) {
            var test = document.getElementsByClassName('test');      //finding the div.test in the page
            $(test).append(canvas);                               //appending the canvas to the div
            var canvas = document.getElementsByTagName('canvas');       
            $(canvas).attr('id','test');                              //assigning an id to the canvas
            var can2 = document.getElementById("test");
            var dataURL = can2.toDataURL("image/png");
            document.getElementById("image_test").src = dataURL;     //assigning the url to the image
            $(canvas).remove();                                   //removing the canvas from the page

            var tempLink = document.createElement('a'), e; 
                tempLink.download = 'untitled.png';
                if (/(iPad|iPhone|iPod)/g.test(navigator.userAgent)) { //iOS = Iphone, Ipad, etc.
                    alert("Instructions...");
                    tempLink.target = "_blank";
                    tempLink.href = dataURL;
                } else {
                    tempLink.target = ghostFrame.name;
                    tempLink.href = dataURL.replace(/^data[:]image\/png[;]/i, "data:application/download;");//force download
                }

            if (document.createEvent)                            // create a "fake" click-event to trigger the download
            {
                e = document.createEvent("MouseEvents");
                e.initMouseEvent("click", true, true, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
                tempLink.dispatchEvent(e);
            } else if (tempLink.fireEvent) {
                tempLink.fireEvent("onclick");
            }
        },
        logging:true,
        background: "#fff",
    });
});

Alternative solution (not work in iOS):

You will have to upload the file to the server and then set the required headers for download, see:

• Upload image
• Download image with .htaccess (add "htaccess" just the folder that the images are generated by <canvas>.toDataURL)
• Download image with PHP