Example of jquery getting the distance between a div and the window and the parent dv_jquery

In jquery, jquery.offset().top/left is used to get the distance of the div from the window, and jquery.position().top/left is used to get the distance from the parent div (it must be an absolutely positioned div).

(1) First introduce jquery.offset().top / left
css:

Copy code The code is as follows:

*{ margin: 0px; padding: 0px; }
div{ margin: 0px auto; }
.a{ width: 960px; height: 200px; }
.parentBox{ padding: 30px; margin-top: 40px; width: 960px; height: 300px; }
.innerBox{ padding: 20px; margin-top: 10px; width: 400px; height: 100px; }

html:

Copy code The code is as follows:

< ;body>

a

innerBox

js:

Copy code The code is as follows:

$(function(){
var_offsetTop = $(".innerBox").offset().top; //280px
})

280px here= a.height/200px parentBox.padding-top/30px parentBox.margin-top/40px innerBox.margin-top/10px;
//If the parentBox here sets position : relative; innerBox sets position: absolute; and innerBox sets top: 40px;
//At this time, the value of _offsetTop is 290px = a.height/200px parentBox.margin-top/40px innerBox.margin-top/10px ineBox.top/40px;
//Because the absolute definition is based on the inner border of the upper left corner of the parent div as the reference coordinate.
//If the innerBox sets a border, add the border value

(2) jqury.position().top /left is used to get the distance between the child div and the parent div, and the child The div must be absolutely positioned
css:

Copy code The code is as follows:

*{ margin: 0px; padding: 0px; }
div{ margin: 0px auto; }
.a{ width: 960px; height: 200px; }
.parentBox{ padding: 30px; margin-top: 40px ; width: 960px; height: 300px; position: relative; }
.innerBox{ padding: 20px; margin-top: 10px; width: 400px; height: 100px; position: absolute; }

html:

Copy code The code is as follows:

< ;div class="a"> a

innerBox

$(function(){
var_offsetTop = $(".innerBox").offset().top; //280px
})

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