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屏幕顯示頁面底部時如何在屏幕中間顯示固定div

[英]How to show fixed div in middle of screen when screen show bottom of page

我設計了一個包含許多小圖像的頁面,我喜歡單擊小圖像然后打開一個固定的div並顯示我的大圖像,它非常適合頁面上方的圖像,但是當滾動下拉至頁面底部時,現在效果很好,什么是問題,您可以在此頁面中看到: http ://www.3dcreate.ir/New3DCreate/Pages/Gallery/3DGallery/3dg_Chosen.php

HTML代碼:

<!-- This is Div of Large Image and Background Shade -->
<div class="BackgroudShade"></div>
<div class="DivOfImage"><img class="LargeImage"/></div>

CSS代碼:

.DivOfImage {
    border: 8px solid #FFF;
    color:#FFF;
    background-color:#FFF;
    border-radius:10px;
    position:fixed;
}

jQuery代碼:

function LoadShowDiv () {
    $('.BackgroudShade').slideDown(800);   // shade of background will be visible
    $(".DivOfImage").show();               // Div of Large Image will be visible          
// When Image loaded successful then set width,height and top,left of Large Image Div 
// but i want set top,left when screen is scroll down to bottom of page
// then show Div at middle of screen in every time
    $('.LargeImage').load(function() {     
       $('.DivOfImage').width($('.LargeImage').width());
       $('.DivOfImage').height($('.LargeImage').height());
       var LeftPostion = (WidthOfScreen - $('.LargeImage').width()) / 2;
       var TopPostion = (HeightOfScreen - $('.LargeImage').height()) / 2;
       $(".DivOfImage").offset({ top: TopPostion, left: LeftPostion});
       $('.LargeImage').show(1000);
    })
}

$('#SmallImage').click(function(){
    $('.LargeImage').attr('src','LargeImage.jpg');
    LoadShowDiv();
})

我不確定,但是為什么不嘗試:

$(".DivOfImage").css({'position': 'fixed', 'top': TopPostion + 'px', 'left': LeftPostion + 'px'});

代替

$(".DivOfImage").offset({ top: TopPostion, left: LeftPostion});

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