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Create an empty img element using document. createElement() method. Then set its attributes like (src, height, width, alt, title etc). Finally, insert it into the document.
Image() The Image() constructor creates a new HTMLImageElement instance. It is functionally equivalent to document. createElement('img') .
oImg.setAttribute('width', '1px');
px is for CSS only. Use either:
oImg.width = '1';
to set a width through HTML, or:
oImg.style.width = '1px';
to set it through CSS.
Note that old versions of IE don't create a proper image with document.createElement(), and old versions of KHTML don't create a proper DOM Node with new Image(), so if you want to be fully backwards compatible use something like:
// IEWIN boolean previously sniffed through eg. conditional comments
function img_create(src, alt, title) {
var img = IEWIN ? new Image() : document.createElement('img');
img.src = src;
if ( alt != null ) img.alt = alt;
if ( title != null ) img.title = title;
return img;
}
Also be slightly wary of document.body.appendChild if the script may execute as the page is in the middle of loading. You can end up with the image in an unexpected place, or a weird JavaScript error on IE. If you need to be able to add it at load-time (but after the <body> element has started), you could try inserting it at the start of the body using body.insertBefore(body.firstChild).
To do this invisibly but still have the image actually load in all browsers, you could insert an absolutely-positioned-off-the-page <div> as the body's first child and put any tracking/preload images you don't want to be visible in there.
var img = new Image(1,1); // width, height values are optional params
img.src = 'http://www.testtrackinglink.com';
var img = document.createElement('img');
img.src = 'my_image.jpg';
document.getElementById('container').appendChild(img);
jQuery:
$('#container').append('<img src="/path/to/image.jpg"
width="16" height="16" alt="Test Image" title="Test Image" />');
I've found that this works even better because you don't have to worry about HTML escaping anything (which should be done in the above code, if the values weren't hard coded). It's also easier to read (from a JS perspective):
$('#container').append($('<img>', {
src : "/path/to/image.jpg",
width : 16,
height : 16,
alt : "Test Image",
title : "Test Image"
}));
Just for the sake of completeness, I would suggest using the InnerHTML way as well - even though I would not call it the best way...
document.getElementById("image-holder").innerHTML = "<img src='image.png' alt='The Image' />";
By the way, innerHTML is not that bad
Shortest way:
(new Image()).src = "http:/track.me/image.gif";
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