在另一个div上叠加一个横幅div，如果可能的话用jQuery [英] Superimpose a banner div over another div, with jQuery if possible

问题描述

我有一个新闻div和一个横幅div。

我希望用户在加载网页时看到横幅div。这个横幅div应该显示在新闻div，正好在位置，覆盖新闻div。所以：

I have a "news" div and a "banner" div.
I want user to see the "banner" div when page loads. This "banner" div should show over the "news" div, exactly over the position, covering the "news" div. So:

• 如何检测新闻div的位置并显示横幅而不影响网格结构？

• How should I do to detect position of "news" div and show the "banner" div over, floating, without affecting the grid structure?

任何jQuery插件，允许用户隐藏该div，不再显示？ w / cookie？

Any jQuery plugin that allows user to hide that div and never show again? w/ cookie?

希望你了解我的想法。我留下一张图片：

Hope you've understood my idea. I leave an image:

推荐答案

我意识到这个问题已经回答了，但我想我会提供一个替代方案，使用CSS，jQuery和 jQuery Cookie插件：

I realise this question has already been answered, but I thought I'd offer a slight alternative, using CSS, jQuery and the jQuery cookie plugin:

<div class="container">
    <div class="news">
        <p>Lorem ipsum dolor sit amet...</p>
    </div>
    <div class="banner">
        <p>Yet more text, this time it's the banner.</p>
        <span class="close">X</span>
    </div>
</div>
<div id="clear">Remove the cookie</div>

css：

css:

.container {
    width: 80%;
    min-height: 400px;
    position: relative;
    border: 4px solid #000;
}
.news {
    width: 100%;
    height: 100%;
}

.banner {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #f00;
}
.close {
    position: absolute;
    top: 0;
    right: 0;
    border-left: 2px solid #fff;
    border-bottom: 2px solid #fff;
    width: 2em;
    line-height: 2em;
    text-align: center;
    display: block;
    cursor: pointer;
}
#clear {
    width: 80%;
    text-align: right;
    color: #fff;
    background-color: #999;
    border: 4px solid #000;
    border-top-width: 0;
    font-family: arial, sans-serif;
    cursor: pointer;
}

jQuery：

jQuery:

$(document).ready(

function(){
    if ($.cookie('closed')){
        $('.banner').remove();
    }
    $('.close').click(
        function(){
            $(this).closest('.banner').remove();
            $.cookie('closed',true, {expires: 30});
        });
    $('#clear').click(
        function(){
            $.cookie('closed',false, {expires: -200});
        });
});

JS Fiddle demo 。

一个稍微更美观的演示，用 animate（） ：

A slightly more pleasing demo, with animate():

$(document).ready(
    function(){
        if ($.cookie('closed')){
            $('.banner').remove();
        }
        $('.close').click(
            function(){
                $(this)
                    .closest('.banner')
                    .animate(
                        {
                            'top':'120%'
                        }, 1500,
                        function(){
                            $(this).remove();
                        }
                    );
                $.cookie('closed',true, {expires: 30});
            });
        $('#clear').click(
            function(){
                $.cookie('closed',false, {expires: -200});
            });
    });

JS Fiddle演示

---

已编辑你会得到重复的访问者，可能值得重新设置cookie在如果检查，以确保他们没有看到横幅再次（除非他们留下更多超过30天），将其更改为：

---

Edited with an afterthought, assuming that you get repeat visitors, it might be worth re-setting the cookie in the initial if check, to ensure that they don't see the banner ever again (unless they leave more than 30 days between visits), changing it to:

if ($.cookie('closed')){
    $('.banner').remove();
    $.cookie('closed',true,{expires: 30});
}

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