jQuery FancyBox with Ajax

问题

I have look at many web sites and many pages on Stackoverflow, but none of them has solved my problem yet. Simply, I have a hyperlink and I want to retrieve an image from database via Ajax call and then display it on FancyBox popup. I also tried many different combinations of Javascript and Controller action methods, but have not managed so display the downloaded file properly. Could you please have a look at my code and give a working example containing all the necessary methods in View and in Controller? On the other hand, it would be better to open a dialog for the other file types (i.e. excel, pdf) while opening FancyBox for image files.

View:

<a onclick="downloadFile(@Model.ID);">@Model.FileName</a>


function downloadFile(id) {     
    $.ajax({
        url: "/Issue/RenderImage?ID=" + id,
        async: true,
        type: "POST",
        dataType: "json",
        contentType: "application/json; charset=utf-8",
        success: function (response) {
            $('#fancybox-inner').html('<img height="200" width="250" src="data:image/png;base64,' + response + '" />');
        }       
    });
}

Controller: There is no problem regarding to the method in the Controller and it returns the image properly.

[HttpPost]
public virtual JsonResult RenderImage(int id)
{
    string str = System.Convert.ToBase64String(repository.FileAttachments.FirstOrDefault(p => p.ID == id).FileData, 0, repository.FileAttachments.FirstOrDefault(p => p.ID == id).FileData.Length);
    return Json(new { Image = str, JsonRequestBehavior.AllowGet });
}

回答1:

Better try

success: function (response) {
    $.fancybox({
        content: '<img height="200" width="250" src="data:image/png;base64,' + response + '" />',
        type: "html"
    });
}  

I wonder why you trying to load the content inside a fancybox container when you don't show any code where you already opened it. Anyways, it's always better to launch a new fancybox with the new content (from ajax response)

Of course, this will work if the ajax call is returning the correct response for your <img> tag, but that I cannot tell.

回答2:

This should work. Looks like image is stored as JSON. If so, I think you should convert it back to Base64 before sending it to the browser. See http://mobile.cs.fsu.edu/converting-images-to-json-objects/

function downloadFile(id) {
    $('#fancybox-inner').html('<img height="200" width="250" src="/Issue/RenderImage?ID='+id+'" />');
}

来源：https://stackoverflow.com/questions/31351626/jquery-fancybox-with-ajax