jQuery 使用jquery查找div底部的位置
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Finding the position of bottom of a div with jquery
提问by lagwagon223
I have a div and want to find the bottom position. I can find the top position of the Div like this, but how do I find the bottom position?
我有一个 div，想找到底部位置。我可以像这样找到 Div 的顶部位置，但是如何找到底部位置？
var top = $('#bottom').position().top;
return top;
回答by user1026361
Add the outerheight to the top and you have the bottom, relative to the parent element:
相对于父元素，将外部高度添加到顶部，您就有了底部：
var $el = $('#bottom'); //record the elem so you don't crawl the DOM everytime
var bottom = $el.position().top + $el.outerHeight(true); // passing "true" will also include the top and bottom margin
With absolutely positioned elements or when positioning relative to the document, you will need to instead evaluate using offset:
对于绝对定位的元素或相对于文档定位时，您将需要使用偏移量进行评估：
var bottom = $el.offset().top + $el.outerHeight(true);
As pointed out by trnelsonthis does not work 100% of the time. To use this method for positioned elements, you also must account for offset. For an example see the following code.
正如trnelson所指出的，这在 100% 的情况下都不起作用。要对定位元素使用此方法，您还必须考虑偏移。有关示例，请参阅以下代码。
var bottom = $el.position().top + $el.offset().top + $el.outerHeight(true);
回答by yoyodunno
EDIT: this solution is now in the original answer too.
编辑：这个解决方案现在也在原始答案中。
The accepted answer is not quite correct. You should not be using the position() function since it is relative to the parent. If you are doing global positioning(in most cases?) you should only add the offset top with the outerheight like so:
接受的答案并不完全正确。您不应该使用 position() 函数，因为它是相对于父级的。如果您正在进行全局定位（在大多数情况下？），您应该只添加偏移顶部和外层高度，如下所示：
var actualBottom = $(selector).offset().top + $(selector).outerHeight(true);
The docs http://api.jquery.com/offset/
回答by Sly
The answers so far will work.. if you only want to use the height without padding, borders, etc.
到目前为止的答案将起作用..如果您只想使用没有填充、边框等的高度。
If you would like to account for padding, borders, and margin, you should use .outerHeight.
如果您想考虑填充、边框和边距，您应该使用.outerHeight.
var bottom = $('#bottom').position().top + $('#bottom').outerHeight(true);
回答by Jish
var bottom = $('#bottom').position().top + $('#bottom').height();
回答by zzzzBov
The bottom is the top+ the outerHeight, not the height, as it wouldn't include the margin or padding.
底部是top+ outerHeight，而不是height，因为它不包括边距或填充。
var $bot,
top,
bottom;
$bot = $('#bottom');
top = $bot.position().top;
bottom = top + $bot.outerHeight(true); //true is necessary to include the margins
回答by Cecil Theodore
var top = ($('#bottom').position().top) + ($('#bottom').height());
