Image servlet file delivery completion event

Suppose there is a 4.3 mb png file.I used Balus c Image servlet to show the image inline in my jsp page.But the file being 4.3mb in size takes time to download.I would like t开发者_JS百科o show a loading gif in the meantime and keep the image hidden by setting its style as "display:none;".The question is how do i know that the image has been delivered completely by the servlet before rendering the image.

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You can put the url of your gif image in the html produced by the jsp, then fetch the image at load time:

$(function() {
    var loadr = new Image();
    $(loadr).load(function() {
        $("#myimg").attr("src", this.src);
    });
    loadr.src = "servletUrl";
});