如何在Javascript中获取图像的垂直位置？ （就该文件而言）

Question

I am trying to dynamically get the Y position of an image in JavaScript in relation to the screen/document. How can I do that? is there anything like in AC3 where you can do: getProperty(obj, _x) ?

Answer 1

Replace your image id to get y or top position of image:

JS:

var offsets = document.getElementById('image_id').getBoundingClientRect();
                                 //HERE^
var top = offsets.top;

Jquery: If you use jquery library, do:

$(document).ready(function(){
    var position = $("#image_id").position();
    var top = position.top;
}); 

Answer 2

element.getBoundingClientRect() will return an object with values for the top, bottom, left, and right sides of the element.

To get the y position of an element, just do element.getBoundingClientRect().top .