如何计算 Facebook 图 api 覆盖 offset_y 到像素? [英] how to compute Facebook graph api cover offset_y to pixel?

问题描述

例如，我可以从图形 api 中检索 facebook 封面来源和 offset_y -

https://graph.facebook.com/Inna

我明白了 -

封面":{"cover_id": "10151356812150381",来源":http://sphotos.xx.fbcdn.net/hphotos-snc7/s720x720/419277_10151356812150381_302056140380_23114100_97822830_n.jpg"偏移_y":54}

但是当我查看实际的 facebook 页面时，我看到顶部偏移是 -135px.这是如何从 54 计算出来的?

我想在我的网站上显示某人的封面照片，偏移量与 Facebook 相同.所以我基本上是在做 -

CSS -

.ed .ed-cover{高度:315px；溢出:隐藏；位置:相对；}.ed .ed-cover img{宽度:100%；位置:绝对；}

JS -

FB.api(artist, function (data) {$('.ed-cover img').attr('src', data.cover.source).css("top", -1 * data.cover.offset_y);});

但是这里top"属性的 CSS 偏移是不正确的，因为我返回 54 并且实际偏移是 -135px；

解决方案

是的，实际上我自己找到了答案.facebook 发送的偏移量是百分比！

以下工作完美 -

 FB.api(artist, function (data) {$('.ed-cover img').attr('src', data.cover.source).css("top", (-1 * data.cover.offset_y) + '%');});

I can retrieve facebook cover source and offset_y from graph api for example -

https://graph.facebook.com/Inna

I get this -

"cover": {
      "cover_id": "10151356812150381",
      "source": "http://sphotos.xx.fbcdn.net/hphotos-snc7/s720x720/419277_10151356812150381_302056140380_23114100_97822830_n.jpg",
      "offset_y": 54
   }

But when i look at the actual facebook page for this, i see the top offset is -135px. How is that calculated from 54?

I want to display someones cover photo on my website, with the same offset as facebook. So I am basically doing -

<div class="ed-cover">
            <img src=""/>
    </div>

CSS -

.ed .ed-cover
{
    height:315px;
    overflow:hidden;
    position:relative;
}

.ed .ed-cover img
{
    width:100%;
    position:absolute;    
}

JS -

FB.api(artist, function (data) {
                        $('.ed-cover img').attr('src', data.cover.source).css("top", -1 * data.cover.offset_y);
                    });

But the CSS offset here for the "top" property is incorrect as i get back 54 and the real offset is -135px;

解决方案

Yes i actually found the answer myself. The offset that facebook sends is in percentage!

The following worked perfectly -

    FB.api(artist, function (data) {
                            $('.ed-cover img').attr('src', data.cover.source)
.css("top", (-1 * data.cover.offset_y) + '%');
                        });

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