Find the distance between HTML element and browser (or window) sides

问题

How to find the distance in pixels between html element and one of the browser (or window) sides (left or top) using jQuery?

回答1:

You can use the offset function for that. It gives you the element's position relative to the (left,top) of the document:

var offset = $("#target").offset();
display("span is at " + offset.left + "," + offset.top + 
  " of document");

Live example On my browser, that example says that the span we've targeted is at 157,47 (left,top) of the document. This is because I've applied a big padding value to the body element, and used a span with a spacer above it and some text in front of it.

Here's a second example showing a paragraph at the absolute left,top of the document, showing 0,0 as its position (and also showing a span later on that's offset from both the left and top, 129,19 on my browser).

回答2:

jQuery.offset needs to be combined with scrollTop and scrollLeft as shown in this diagram:

Demo:

function getViewportOffset($e) {
  var $window = $(window),
    scrollLeft = $window.scrollLeft(),
    scrollTop = $window.scrollTop(),
    offset = $e.offset();
  return {
    left: offset.left - scrollLeft,
    top: offset.top - scrollTop
  };
}
$(window).on("load scroll resize", function() {
  var viewportOffset = getViewportOffset($("#element"));
  $("#log").text("left: " + viewportOffset.left + ", top: " + viewportOffset.top);
});

body { margin: 0; padding: 0; width: 1600px; height: 2048px; background-color: #CCCCCC; }
#element { width: 384px; height: 384px; margin-top: 1088px; margin-left: 768px; background-color: #99CCFF; }
#log { position: fixed; left: 0; top: 0; font: medium monospace; background-color: #EEE8AA; }

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>

<!-- scroll right and bottom to locate the blue square -->
<div id="element"></div>
<div id="log"></div>

来源：https://stackoverflow.com/questions/4601852/find-the-distance-between-html-element-and-browser-or-window-sides

标签

javascript

jquery

html

position

distance