How to display an image that we received through Ajax call?

问题

Web server generates images and sends them to client directly. There are no URLs to the images, for security reasons. For example, if I enter /images/25 URL in the browser server will send it and browser will download it.

Now I want to get this image from Ajax call and then display it on existing page. I can get the image data. My question is: how can I display an image?

$.get("/images/25", function (rawImageData) {
   // ??? Need to add an image to DOM
});

Update

I apologize for being so stupid. Thank you, JW. Of course I can just put img tag with src to my URL. It does not matter if this is a direct URL to an image file or the server sends it dynamically.

回答1:

So it sounds like there is a URL, and it's /images/25.

As far as I know, you can't display image data that you get from an AJAX call*. But why not just put the URL in an <img> tag? It doesn't matter to the browser that the image is generated by the server, rather than read from a file.

*EDIT: I was wrong; see gideon's answer if you really need to use an AJAX call (e.g. you need to make a POST request, or send certain headers).

回答2:

To expand on Matt's answer you could use base64 encoded img urls. This is an example from wikipedia of what that img tag would look like:

<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUA
 AAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO
 9TXL0Y4OHwAAAABJRU5ErkJggg==" alt="Red dot" />

You need a blank image:

<img id="target" src="" />

Your server needs to return the image as a base64 string, then you could do:

$.get("/images/25", function (rawImageData) {
      $("#target").attr("src","data:image/gif;base64," + rawImageData);
});

See this MDN reference for more in base64 encoded img urls.

I made a short demo here: http://jsfiddle.net/99jAX/1/

回答3:

You want to send the raw image data base64-encoded, combined with the data:// URI scheme.

回答4:

I'd bank on it being the same as if you rendered if via PHP or ASP or whatever. just something simple like

$('#elementOfChoice').append('<img src="'+ rawImageData +'" alt="something" />');

though I could be wrong. All depends on whats happening behind the scenes to make that image become what it is. If its gotta pass through a PHP file cause its a base_64 image and needs to be encoded, or whatever the case then that has to be done accordingly.

回答5:

$( "<img>" ).attr( "src", icon_url ).appendTo( "#images" );

来源：https://stackoverflow.com/questions/9511302/how-to-display-an-image-that-we-received-through-ajax-call

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javascript

jquery